10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

ý	Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
For the quarterly period ended
March 31, 2018
or
o	Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Commission File Number: 001-38272

EVOQUA WATER TECHNOLOGIES CORP.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	46-4132761 (I.R.S. Employer Identification No.)
210 Sixth Avenue Pittsburgh, Pennsylvania (Address of principal executive offices)	15222 (Zip code)

(724) 772-0044

(Registrant's telephone number, including area code)

         Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý   No o

         Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ý    No o

         Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer",

"accelerated filer", "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer o Accelerated filer o Non-accelerated filer ý (Do not check if a smaller reporting company) Smaller reporting company o Emerging growth company o

         If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

         Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o    No ý

         There were 113,786,702 shares of the registrant's common stock, par value $0.01 per share, outstanding as of April 30, 2018.

EVOQUA WATER TECHNOLOGIES CORP.

TABLE OF CONTENTS

		Page
PART I - FINANCIAL INFORMATION
Item 1	Condensed Consolidated Financial Statements		4
Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operation		37
Item 3	Quantitative and Qualitative Disclosures About Market Risk		57
Item 4	Controls and Procedures		58
PART II - OTHER INFORMATION
Item 1	Legal Proceedings		59
Item 1A	Risk Factors		59
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds		59
Item 3	Defaults Upon Senior Securities		59
Item 4	Mine Safety Disclosures		59
Item 5	Other Information		59
Item 6	Exhibits		59

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains forward‑looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). You can generally identify forward‑looking statements by our use of forward‑looking terminology such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “potential,” “predict,” “projection,” “seek,” “should,” “will” or “would” or the negative thereof or other variations thereon or comparable terminology. In particular, statements about the markets in which we operate, including growth of our various markets, and our expectations, beliefs, plans, strategies, objectives, prospects, assumptions, or future events or performance contained in this report are forward‑looking statements.

We have based these forward‑looking statements on our current expectations, assumptions, estimates and projections. While we believe these expectations, assumptions, estimates and projections are reasonable, such forward‑looking statements are only predictions and involve known and unknown risks and uncertainties, many of which are beyond our control. These and other important factors, including those discussed in “Item 1A. Risk Factors” of our Annual Report on Form 10-K for the fiscal year ended September 30, 2017, as filed with the Securities and Exchange Commission (SEC) on December 4, 2017, may cause our actual results, performance or achievements to differ materially from any future results, performance or achievements expressed or implied by these forward‑looking statements, or could affect our share price. Some of the factors that could cause actual results to differ materially from those expressed or implied by the forward‑looking statements include:

• general global economic and business conditions;

• our ability to compete successfully in our markets;

• our ability to continue to develop or acquire new products, services and solutions and adapt our business to meet the demands of our customers, comply with changes to government regulations and achieve market acceptance with acceptable margins;

• our ability to implement our growth strategy, including acquisitions and our ability to identify suitable acquisition targets;

• our ability to operate or integrate any acquired businesses, assets or product lines profitably or otherwise successfully implement our growth strategy;

• delays in enactment or repeals of environmental laws and regulations;

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• the potential for us to become subject to claims relating to handling, storage, release or disposal of hazardous materials;

• risks associated with product defects and unanticipated or improper use of our products;

• the potential for us to incur liabilities to customers as a result of warranty claims of failure to meet performance guarantees;

• our ability to meet our customers’ safety standards or the potential for adverse publicity affecting our reputation as a result of incidents such as workplace accidents, mechanical failures, spills, uncontrolled discharges, damage to customer or third‑party property or the transmission of contaminants or diseases;

• litigation, regulatory or enforcement actions and reputational risk as a result of the nature of our business or our participation in large‑scale projects;

• seasonality of sales and weather conditions;

• risks related to government customers, including potential challenges to our government contracts or our eligibility to serve government customers;

• the potential for our contracts with federal, state and local governments to be terminated or adversely modified prior to completion;

• risks related to foreign, federal, state and local environmental, health and safety laws and regulations and the costs associated therewith;

• risks associated with international sales and operations, including our operations in China;

• our ability to adequately protect our intellectual property from third‑party infringement;

• our increasing dependence on the continuous and reliable operation of our information technology systems;

• risks related to our substantial indebtedness;

• our need for a significant amount of cash, which depends on many factors beyond our control;

2

• risks related to AEA Investors LP’s (along with certain of its affiliates, collectively, “AEA”) ownership interest in us; and

• other risks and uncertainties, including those listed under “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017, as filed with the SEC on December 4, 2017, and in other filings we may make from time to time with the SEC.

Given these risks and uncertainties, you are cautioned not to place undue reliance on such forward‑looking statements. The forward‑looking statements contained in this Report are not guarantees of future performance and our actual results of operations, financial condition and liquidity, and the development of the industry in which we operate, may differ materially from the forward‑looking statements contained in this Report. In addition, even if our results of operations, financial condition and liquidity, and events in the industry in which we operate, are consistent with the forward‑looking statements contained in this Report, they may not be predictive of results or developments in future periods.

Any forward‑looking statement that we make in this Report speaks only as of the date of such statement. Except as required by law, we do not undertake any obligation to update or revise, or to publicly announce any update or revision to, any of the forward‑looking statements, whether as a result of new information, future events or otherwise, after the date of this Report.

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Part I - Financial Information

Item 1. Condensed Consolidated Financial Statements

INDEX TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Evoqua Water Technologies Corp.
Unaudited Condensed Consolidated Financial Statements
Condensed Consolidated Balance Sheets as of September 30, 2017 and March 31, 2018 (Unaudited)	5
Unaudited Condensed Consolidated Statements of Operations for the Three and Six Months Ended March 31, 2017 and 2018	6
Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three and Six Months Ended March 31, 2017 and 2018	7
Unaudited Condensed Consolidated Statements of Changes in Equity for the Six Months Ended March 31, 2017 and 2018	8
Unaudited Condensed Consolidated Statements of Changes in Cash Flow for the Six Months Ended March 31, 2017 and 2018	9
Unaudited Supplemental Disclosure of Cash Flow Information for the Six Months Ended March 31, 2017 and 2018	10
Notes to Unaudited Condensed Consolidated Financial Statements	11

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Evoqua Water Technologies Corp.

Condensed Consolidated Balance Sheets

(In thousands)

			(Unaudited)
	September 30, 2017		March 31, 2018
ASSETS
Current assets	$	512,240	$	530,872
Cash and cash equivalents	59,254		75,742
Receivables, net	245,248		217,852
Inventories, net	120,047		136,251
Cost and earnings in excess of billings on uncompleted contracts	66,814		74,792
Prepaid and other current assets	20,046		25,394
Income tax receivable	831		841
Property, plant, and equipment, net	280,043		285,687
Goodwill	321,913		329,898
Intangible assets, net	333,746		323,515
Deferred income taxes	2,968		7,140
Other non‑current assets	22,399		22,747
Total assets	$	1,473,309	$	1,499,859
LIABILITIES AND EQUITY
Current liabilities	$	291,899	$	282,645
Accounts payable	114,932		138,454
Current portion of debt	11,325		11,057
Billings in excess of costs incurred	27,124		25,040
Product warranties	11,164		8,746
Accrued expenses and other liabilities	121,923		91,998
Income tax payable	5,431		7,350
Non‑current liabilities	964,835		856,138
Long‑term debt	878,524		775,984
Product warranties	6,110		3,790
Other non‑current liabilities	67,673		66,080
Deferred income taxes	12,528		10,284
Total liabilities	1,256,734		1,138,783
Commitments and Contingent Liabilities (Note 17)
Shareholders’ equity
Common stock, par value $0.01: authorized 1,000,000 shares; issued 105,359 shares, outstanding 104,949 shares at September 30, 2017; issued 114,710 shares, outstanding 113,769 shares at March 31, 2018.	1,054		1,142
Treasury stock: 410 shares at September 30, 2017 and 941 shares at March 31, 2018.	(2,607)		(2,837)
Additional paid‑in capital	388,986		525,997
Retained deficit	(170,006)		(161,216)
Accumulated other comprehensive loss, net of tax	(5,989)		(6,782)
Total Evoqua Water Technologies Corp. equity	211,438		356,304
Non‑controlling interest	5,137		4,772
Total shareholders’ equity	216,575		361,076
Total liabilities and shareholders’ equity	$	1,473,309	$	1,499,859

See accompanying notes to these Unaudited Condensed Consolidated Financial Statements

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Evoqua Water Technologies Corp.

Unaudited Condensed Consolidated Statements of Operations

(In thousands except per share data)

	Three Months Ended March 31,						Six Months Ended March 31,
	2017			2018			2017			2018
Revenue from product sales and services	$	299,901		$	333,690		$	579,773		$	630,740
Cost of product sales and services	(205,568		)	(225,693		)	(403,372		)	(434,364		)
Gross profit	94,333			107,997			176,401			196,376
General and administrative expense	(40,211		)	(44,742		)	(89,397		)	(83,807		)
Sales and marketing expense	(36,690		)	(34,330		)	(71,783		)	(68,571		)
Research and development expense	(5,086		)	(4,021		)	(10,091)			(8,674)
Other operating (expense) income	(365		)	904			1,309			311
Interest expense	(11,898		)	(10,810		)	(26,651		)	(28,053		)
Income (loss) before income taxes	83			14,998			(20,212		)	7,582
Income tax benefit (expense)	4,812			(2,018		)	11,907			2,393
Net income (loss)	4,895			12,980			(8,305		)	9,975
Net income attributable to non‑controlling interest	1,697			477			2,096			1,185
Net income (loss) attributable to Evoqua Water Technologies Corp.	$	3,198		$	12,503		$	(10,401	)	$	8,790
Basic earnings (loss) per common share	$	0.03		$	0.11		$	(0.10	)	$	0.08
Diluted earnings (loss) per common share	$	0.03		$	0.10		$	(0.10	)	$	0.07

See accompanying notes to these Unaudited Condensed Consolidated Financial Statements

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Evoqua Water Technologies Corp.

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss)

(In thousands)

	Three Months Ended March 31,						Six Months Ended March 31,
	2017			2018			2017			2018
Net income (loss)	$	4,895		$	12,980		$	(8,305	)	$	9,975
Other comprehensive income
Foreign currency translation adjustments	2,581			(458)			5,800			(793)
Less: Comprehensive income attributable to non‑controlling interest	(1,697		)	(477		)	(2,096		)	(1,185		)
Comprehensive income (loss) attributable to Evoqua Water Technologies Corp.	$	5,779		$	12,045		$	(4,601	)	$	7,997

See accompanying notes to these Unaudited Condensed Consolidated Financial Statements

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Evoqua Water Technologies Corp.

Unaudited Condensed Consolidated Statements of Changes in Equity

(In thousands)

	Common Stock Shares	Common Stock		Treasury Stock Shares	Treasury Stock			Additional Paid‑in Capital			Retained Deficit			Accumulated Other Comprehensive Loss			Non‑controlling Interest			Total
Balance at September 30, 2016	104,495	$	1,045	245	$	(1,133	)	$	381,223		$	(172,169	)	$	(10,671	)	$	5,640		$	203,935
Equity based compensation expense	—	—		—	—			1,020			—			—			—			1,020
Issuance of common stock	593	6		—	—			4,145			—			—			—			4,151
Stock repurchases	—	—		81	(543		)	—			—			—			—			(543		)
Dividends paid to non‑controlling interest	—	—		—	—			—			—						(3,500		)	(3,500		)
Net income (loss)	—	—		—	—			—			(10,401		)	—			2,096			(8,305		)
Other comprehensive loss		—			—			—			—			5,800			—			5,800
Balance at March 31, 2017	105,088	$	1,051	326	$	(1,676	)	$	386,388		$	(182,570	)	$	(4,871	)	$	4,236		$	202,558
Balance at September 30, 2017	105,359	$	1,054	410	$	(2,607	)	$	388,986		$	(170,006	)	$	(5,989	)	$	5,137		$	216,575
Equity based compensation expense	—	—		—	—			6,862			—			—						6,862
Shares of common stock issued in initial public offering, net of offering costs	8,333	83		—	—			137,522			—			—						137,605
Shares withheld related to net share settlement (including tax withholdings)	1,018	5		513	—			(7,373		)										(7,368		)
Stock repurchases	—	—		18	(230		)	—			—			—						(230		)
Dividends paid to non‑controlling interest	—	—		—	—			—			—			—			(1,550		)	(1,550		)
Net income (loss)	—	—		—	—			—			8,790			—			1,185			9,975
Other comprehensive income	—	—		—	—			—			—			(793		)				(793		)
Balance at March 31, 2018	114,710	$	1,142	941	$	(2,837	)	$	525,997		$	(161,216	)	$	(6,782	)	$	4,772		$	361,076

See accompanying notes to these Unaudited Condensed Consolidated Financial Statements

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Evoqua Water Technologies Corp.

Unaudited Condensed Consolidated Statements of Changes in Cash Flows

(In thousands)

	Six Months Ended March 31,
	2017			2018
Operating activities
Net (loss) income	$	(8,305	)	$	9,975
Reconciliation of net loss to cash flows from operating activities:
Depreciation and amortization	37,520			40,363
Amortization of deferred financing costs (includes $2,075 and $2,994 write off of deferred financing fees)	4,576			4,145
Deferred income taxes	(11,015		)	(6,013		)
Share-based compensation	1,020			6,862
(Gain) loss on sale of property, plant and equipment	(446		)	102
Foreign currency losses (gains) on intracompany loans	5,095			(2,934		)
Changes in assets and liabilities
Accounts receivable	(5,093		)	28,946
Inventories	(8,826		)	(14,936		)
Cost and earnings in excess of billings on uncompleted contracts	1,401			(7,848		)
Prepaids and other current assets	(1,090		)	(5,156		)
Accounts payable	(1,552		)	22,821
Accrued expenses and other liabilities	(13,152		)	(30,810		)
Billings in excess of costs incurred	(1,205		)	(2,032		)
Income taxes	(3,497		)	1,849
Other non‑current assets and liabilities	4,223			(3,483		)
Net cash (used in) provided by operating activities	(346		)	41,851
Investing activities
Purchase of property, plant and equipment	(27,229		)	(31,670		)
Purchase of intangibles	(410		)	(291		)
Proceeds from sale of property, plant and equipment	425			539
Acquisitions, net of cash acquired of $0 and $39	(10,730		)	(10,224		)
Net cash used in investing activities	(37,944		)	(41,646		)
Financing activities
Issuance of debt	150,000			—
Capitalized deferred issuance costs related to refinancing	(4,198		)	(1,792		)
Borrowings under credit facility	33,000			6,000
Repayment of debt	(132,738		)	(111,161		)
Repayment of capital lease obligation	(2,656		)	(5,489		)
Proceeds from issuance of common stock	4,151			137,605
Taxes paid related to net share settlements of share-based compensation awards	—			(7,368		)
Stock repurchases	(543		)	(230		)
Distribution to non‑controlling interest	(3,500		)	(1,550		)
Net cash provided by financing activities	43,516			16,015
Effect of exchange rate changes on cash	(586		)	268
Change in cash and cash equivalents	$	4,640		$	16,488
Cash and cash equivalents
Beginning of period	50,362			59,254
End of period	$	55,002		$	75,742

See accompanying notes to these Unaudited Condensed Consolidated Financial Statements

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Evoqua Water Technologies Corp.

Unaudited Supplemental Disclosure of Cash Flow Information

(In thousands)

	Six Months Ended March 31,
	2017		2018
Supplemental disclosure of cash flow information
Cash paid for taxes	$	1,759	$	2,077
Cash paid for interest	$	20,704	$	20,503
Non‑cash investing and financing activities
Accrued earnout related to acquisitions	$	—	$	461
Capital lease transactions	$	7,054	$	3,948

See accompanying notes to these Unaudited Condensed Consolidated Financial Statements

10

Evoqua Water Technologies Corp.

Notes to Unaudited Condensed Consolidated Financial Statements

September 30, 2017 andMarch 31, 2018

(In thousands)

1. Description of the Company and Basis of Presentation

Background

Evoqua Water Technologies Corp. was incorporated on October 7, 2013. On January 15, 2014, Evoqua Water Technologies Corp., acquired through its wholly owned entities, EWT Holdings II Corp. and EWT Holdings III Corp. (a/k/a Evoqua Water Technologies), all of the outstanding shares of Siemens Water Technologies, a group of legal entity businesses formerly owned by Siemens AG (Siemens). The stock purchase closed on January 15, 2014 and was effective January 16, 2014 (the Acquisition). The stock purchase price, net of cash received, was approximately $730,577. On November 6, 2017, the Company completed its initial public offering (IPO), pursuant to which an aggregate of 27,777 shares of common stock were sold, of which 8,333 were sold by the Company and 19,444 were sold by the selling stockholders, with a par value of $0.01 per share. After underwriting discounts and commissions, the Company received net proceeds from the IPO of approximately $137,605. The Company used a portion of these proceeds to repay $104,936 of indebtedness (including accrued and unpaid interest) under its senior secured First Lien Term Loan facility and the remainder for general corporate purposes. The Company did not receive any proceeds from the sale of shares by the selling stockholders. On November 7, 2017, the selling stockholders sold an additional 4,167 shares of common stock as a result of the exercise in full by the underwriters of an option to purchase additional shares. On March 19, 2018, the Company completed a secondary public offering, pursuant to which 17,500 shares of common stock were sold by certain selling stockholders. On March 21, 2018, the selling stockholders sold an additional 2,625 shares of common stock as a result of the exercise in full by the underwriters of an option to purchase additional shares. The Company did not receive any proceeds from the sale of shares by the selling stockholders.

Evoqua Water Technologies Corp. and subsidiaries is referred to herein as “the Company” or “EWT”.

The Business

EWT provides a wide range of product brands and advanced water and wastewater treatment systems and technologies, as well as mobile and emergency water supply solutions and service contract options through its segment branch network. Headquartered in Pittsburgh, Pennsylvania, EWT is a multi‑national corporation with operations in the United States, Canada, the United Kingdom, the Netherlands, Italy, Germany, Australia, China, and Singapore.

The Company is organizationally structured into three reportable segments for the purpose of making operational decisions and assessing financial performance: (i) Industrial, (ii) Municipal and (iii) Products.

Basis of Presentation

The accompanying Unaudited Condensed Consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP). All intracompany transactions have been eliminated.

The unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such SEC rules. We believe that the disclosures made are adequate to make the information presented not misleading. We consistently applied the accounting policies described in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017, as filed with the SEC on December 4, 2017 (2017 Annual Report), in preparing these unaudited condensed consolidated financial statements, with the exception of accounting standard updates described in Note 2. These condensed consolidated financial statements should be read in conjunction with the audited financial statements and the notes included in our 2017 Annual Report.

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2. Summary of Significant Accounting Policies

Fiscal Year

The Company’s fiscal year ends on September 30.

Use of Estimates

The unaudited condensed consolidated financial statements have been prepared in conformity with U.S. GAAP and require management to make estimates and assumptions. These assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Estimates and assumptions are used for, but not limited to: (i) revenue recognition; (ii) allowance for doubtful accounts; (iii) inventory valuation, asset valuations, impairment, and recoverability assessments; (iv) depreciable lives of assets; (v) useful lives of intangible assets; (vi) income tax reserves and valuation allowances; and (vii) product warranty and litigation reserves. Estimates are revised as additional information becomes available. Actual results could differ from these estimates.

Cash and Cash Equivalents

Cash and cash equivalents are liquid investments with an original maturity of three or fewer months when purchased.

Accounts Receivable

Receivables are primarily comprised of uncollected amounts owed to us from transactions with customers and are presented net of allowances for doubtful accounts. Allowances are estimated based on historical write‑offs and the economic status of customers. The Company considers a receivable delinquent if it is unpaid after the term of the related invoice has expired. Write‑offs are recorded at the time all collection efforts have been exhausted.

Inventories

Inventories are stated at the lower of cost or market, where cost is generally determined on the basis of an average or first‑in, first‑out (FIFO) method. Production costs comprise direct material and labor and applicable manufacturing overheads, including depreciation charges. The Company regularly reviews inventory quantities on hand and writes off excess or obsolete inventory based on estimated forecasts of product demand and production requirements. Manufacturing operations recognize cost of product sales using standard costing rates with overhead absorption which generally approximates actual cost.

Property, Plant, and Equipment

Property, plant, and equipment is valued at cost less accumulated depreciation and impairment losses. If the costs of certain components of an item of property, plant, and equipment are significant in relation to the total cost of the item, they are accounted for and depreciated separately. Depreciation expense is recognized using the straight‑line method. Useful lives are reviewed annually and, if expectations differ from previous estimates, adjusted accordingly. Estimated useful lives for major classes of depreciable assets are as follows:

Asset Class	Estimated Useful Life
Machinery and equipment	3 to 20 years
Buildings and improvements	10 to 40 years

Leasehold improvements are depreciated over the shorter of their estimated useful life or the term of the lease. Costs related to maintenance and repairs that do not extend the assets’ useful life are expensed as incurred.

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Goodwill and Other Intangible Assets

Goodwill represents purchase consideration paid in a business combination that exceeds the value assigned to the net assets of acquired businesses. Other intangible assets consist of customer‑related intangibles, proprietary technology, software, trademarks and other intangible assets. The Company amortizes intangible assets with definite useful lives on a straight‑line basis over their respective estimated economic lives which range from 1 to 26 years.

The Company reviews goodwill to determine potential impairment annually during the fourth quarter of our fiscal year, or more frequently if events and circumstances indicate that the asset might be impaired. Impairment testing for goodwill is performed at a reporting unit level. We have determined that we have four reporting units. Our quantitative impairment testing utilizes both a market (guideline public company) and income (discounted cash flows) method for determining fair value. In estimating the fair value of the reporting unit utilizing a discounted cash flow (“DCF”) valuation technique, we incorporate our judgment and estimates of future cash flows, future revenue and gross profit growth rates, terminal value amount, capital expenditures and applicable weighted‑average cost of capital used to discount these estimated cash flows. The estimates and projections used in the estimate of fair value are consistent with our current budget and long‑range plans, including anticipated change in market conditions, industry trend, growth rates and planned capital expenditures, among other considerations.

Impairment of Long‑Lived Assets

Long‑lived assets, such as property, plant, and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Recoverability of the asset or asset group is measured by comparison of its carrying amount to undiscounted future net cash flows the asset or asset group is expected to generate. If the carrying amount of an asset or asset group is not recoverable, the Company recognizes an impairment loss based on the excess of the carrying amount of the asset or asset group over its respective fair value which is generally determined as the present value of estimated future cash flows or as the appraised value.

Debt Issuance Costs and Debt Discounts

Debt issuance costs are capitalized and amortized over the contractual term of the underlying debt using the straight line method which approximates the effective interest method. Debt discounts and lender arrangement fees deducted from the proceeds have been included as a component of the carrying value of debt and are being amortized to interest expense using the effective interest method.

Amortization of debt issuance costs and debt discounts/premiums included in interest expense were $1,003 and $606 for the three months ended March 31, 2017 and 2018, respectively and $2,501 and $1,151 for the six months ended March 31, 2017 and 2018, respectively.

In October 2016, the Company wrote off $2,075 of deferred financing fees related to the extinguishment of debt and incurred another $481 of fees related to a tack-on financing the Company completed on October 28, 2016.

In November 2017, the Company wrote off $1,844 of deferred financing fees related to a $100,000 prepayment of debt, then subsequently wrote off another $1,150 of fees in December of 2017 due to refinancing its First Lien Term Loan. The Company incurred another $2,131 of fees as a result of the December refinancing.

Revenue Recognition

Sales of goods and services are recognized when persuasive evidence of an arrangement exists, the price is fixed or determinable, collectability is reasonably assured and delivery has occurred or services have been rendered.

For sales of aftermarket parts or products with a low level of customization and engineering time, the Company recognizes revenues at the time risks and rewards of ownership pass, which is generally when products are shipped or delivered to the customer as the Company has no obligation for installation. Sales of short‑term service arrangements are recognized as the services are performed, and sales of long‑term service arrangements are typically recognized on a straight‑line basis over the life of the agreement.

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For certain arrangements where there is significant customization to the product, the Company recognizes revenue under the provisions of Accounting Standards Codification (ASC) 605-35, Revenue Recognition – Construction-Type and Production-Type Contracts. These products include large capital water treatment projects, systems and solutions for municipal and industrial applications. Revenues from construction-type contracts are generally recognized under the percentage-of-completion method, based on the input of costs incurred to date as a percentage of total estimated contract costs. The nature of the contracts is generally fixed price with milestone billings. Approximately $57,818 and $70,520 of revenues from construction-type contracts were recognized on the percentage-of-completion method during the three months ended March 31, 2017 and 2018, respectively and $104,881 and $129,907 for the six months ended March 31, 2017 and 2018, respectively. Contract revenues and cost estimates are reviewed and revised quarterly at a minimum and the cumulative effect of such adjustments are recognized in current operations. The amount of such adjustments have not been material. Cost and earnings in excess of billings under construction‑type arrangements are recorded when contracts have net asset balances where contract costs plus recognized profits less recognized losses exceed progress billings. Billings in excess of costs incurred are recorded when contract progress billings exceed costs and recognized profit less recognized losses. Approximately $5,674 and $6,817 of revenues from construction-type contracts were recognized on a completed contract method, which is typically when the product is delivered and accepted by the customer, during the three months ended March 31, 2017 and 2018, respectively and $14,466 and $13,200 for the six months ended March 31, 2017 and 2018, respectively. The completed contract method is principally used when the contract is short in duration (generally less than twelve months) and where results of operations would not vary materially from those resulting from the use of the percentage-of-completion method.

Product Warranties

Accruals for estimated expenses related to warranties are made at the time products are sold and are recorded as a component of Cost of product sales in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss. The estimated warranty obligation is based on product warranty terms offered to customers, ongoing product failure rates, material usage and service delivery costs expected to be incurred in correcting a product failure, as well as specific obligations for known failures and other currently available evidence. The Company assesses the adequacy of the recorded warranty liabilities on a regular basis and adjusts amounts as necessary.

Shipping and Handling Cost

Shipping and handling costs are included as a component of cost of sales.

Income Taxes

The Company recognizes deferred tax assets and liabilities for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that included the enactment date. Valuation allowances are provided against deferred tax assets when it is deemed more likely than not that some portion or all of the deferred tax asset will not be realized within a reasonable time period. We assess tax positions using a two‑step process. A tax position is recognized if it meets a more‑likely‑than‑not threshold, and is measured at the largest amount of benefit that is greater than 50.0% percent of being realized. Uncertain tax positions are reviewed each balance sheet date.

Sales Taxes

Upon collection of sales tax from revenue, the amount of sales tax is placed into an accrued liability account. This liability is then relieved when the payment is sent to the proper government jurisdiction.

Foreign Currency Translation and Transactions

The functional currency for the international subsidiaries is the local currency. Assets and liabilities are translated into U.S. Dollars using current rates of exchange, while revenues and expenses are translated at the

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weighted‑average exchange rate for the period. The resulting translation adjustments are recorded in other comprehensive income/loss within shareholders equity.

Foreign currency transaction (gains) losses aggregated $2,036 and $2,305 for the three months ended March 31, 2017 and 2018, respectively, and $(5,209) and $3,688 for the six months ended March 31, 2017 and 2018, respectively, are primarily included in General and administrative expenses in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income.

Research and Development Costs

Research and development costs are expensed as incurred. The Company recorded $5,086 and $4,021 of costs for the three months ended March 31, 2017 and 2018, respectively and $10,091 and $8,674 for the six months ended March 31, 2017 and 2018, respectively.

Equity‑based Compensation

The Company measures the cost of awards of equity instruments to employees based on the grant‑date fair value of the award. Prior to the IPO, given the absence of a public trading market for our common stock, the fair value of the common stock underlying our share‑based awards was determined by our board, with input from management, in each case using the income and market valuation approach. Stock options are granted with exercise prices equal to or greater than the estimated fair market value on the date of grant as authorized by our compensation committee. The grant‑date fair value is determined using the Black‑Scholes model. The fair value, net of estimated forfeitures, is amortized as compensation cost on a straight‑line basis over the vesting period primarily as a component of General and administrative expenses. 

Earnings per Share

Basic earnings per common share is computed based on the weighted average number of shares of common stock outstanding during the period. Diluted earnings per common share is computed based on the weighted average number of shares of common stock, plus the effect of diluted potential common shares outstanding during the period using the treasury stock method. Diluted potential common shares include outstanding stock options.

Retirement Benefits

The Company applies, ASC Topic 715, Compensation—Retirement Benefits, which requires the recognition in pension obligations and accumulated other comprehensive income of actuarial gains or losses, prior service costs or credits and transition assets or obligations that have previously been deferred. The determination of retirement benefit pension obligations and associated costs requires the use of actuarial computations to estimate participant plan benefits to which the employees will be entitled. The significant assumptions primarily relate to discount rates, expected long‑term rates of return on plan assets, rate of future compensation increases, mortality, years of service, and other factors. The Company develops each assumption using relevant experience in conjunction with market‑related data for each individual country in which such plans exist. All actuarial assumptions are reviewed annually with third‑party consultants and adjusted as necessary. For the recognition of net periodic postretirement cost, the calculation of the expected return on plan assets is generally derived by applying the expected long‑term rate of return on the market‑related value of plan assets. The fair value of plan assets is determined based on actual market prices or estimated fair value at the measurement date.

Treated Water Outsourcing

The following provides a summary of Treated Water Outsourcing (TWO), a joint venture between the Company and Nalco Water, an Ecolab company in which the Company holds a 50% partnership interest, as of September 30, 2017 and March 31, 2018, respectively. As the Company is obligated to absorb all risk of loss up to 100% of the joint venture partner's equity, TWO is fully consolidated within the Company's consolidated financial statements under ASC 810, Consolidation. The Company has not provided additional financial support to this entity which it is not contractually required to provide, and the Company does not have the ability to use the assets of TWO to settle obligations of the Company’s other subsidiaries.

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	September 30, 2017			March 31, 2018
Current assets (including cash of $1,907 and $3,033)	$	12,006		$	8,043
Property, plant and equipment	6,107			5,704
Goodwill	2,206			2,206
Other non-current assets	2,735			—
Total liabilities	(12,781		)	(6,509		)
	Three Months Ended March 31,
	2017			2018
Total revenues	$	4,004		$	3,577
Total operating expenses	(3,485		)	(2,622		)
Income from operations	$	519		$	955
	Six Months Ended March 31,
	2017			2018
Total revenues	$	8,075		$	9,566
Total operating expenses	(5,768		)	(7,196		)
Income from operations	$	2,307		$	2,370

Recent Accounting Pronouncements

Accounting Pronouncements Not Yet Adopted

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09,Revenue from Contracts with Customers (Topic 606). ASU No. 2014-09 clarifies the principles for recognizing revenue when an entity either enters into a contract with customers to transfer goods or services or enters into a contract for the transfer of non-financial assets. ASU 2014-09 may be adopted using either of two acceptable methods: (1) retrospective adoption to each prior period presented with the option to elect certain practical expedients;or (2) adoption with the cumulative effect recognized at the date of initial application and providing certain disclosures. To assess at which time revenue should be recognized, an entity should use the following steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the entity satisfies a performance obligation. The standard is effective for the Company for the quarter ending December 31, 2018. The Company has completed its first phase of adopting this standard, which was to identify the potential differences that will result from applying the new revenue recognition standard to the Company's contracts with its customers, and has begun the second step of reviewing its contracts to determine the impact of adopting the standard. The Company has completed its preliminary assessment of the impact of the new standard compared to the historical accounting policies on a representative sample of contracts.  The Company does not anticipate a material change to result from the adoption of the new standard related to its product sales.  The Company recognizes revenue for some of its contracts on a percentage of completion basis, which represented approximately 20% of its consolidated net sales for the six months endedMarch 31, 2018.  The Company expects that for some of these contracts, the new guidance will instead require revenue to be recognized at a point in time.   The Company is continuing to assess the ultimate impact that the adoption of this standard will have on its consolidated financial statements and related disclosures.  In addition, the Company is evaluating the changes that will be required in its internal controls as a result of the adoption of this new standard.  The Company is planning to adopt the provisions of the ASU and its subsequent amendments using the modified retrospective transition method for existing transactions that will likely result in a cumulative effect adjustment as of October 1, 2018.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU No. 2016-02 requires recognition of operating leases as lease assets and liabilities on the balance sheet, and disclosure of key information

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about leasing arrangements. ASU No. 2016-02 will be effective retrospectively for the Company for the quarter ending December 31, 2019, with early adoption permitted. The Company is currently reviewing its leasing arrangements in order to evaluate the impact of this standard will have on the Company's Consolidated financial statements.

In August 2016, the FASB issued ASU 2016‑15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force). This new guidance is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. ASU No. 2016‑15 will be effective for the Company for the quarter ending December 31, 2018, with early adoption permitted. The guidance should be applied retrospectively to all periods presented, unless deem impracticable, in which case prospective application is permitted. The Company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

In October 2016, the FASB issued ASU 2016-17, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. The purpose of this update is to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. The ASU requires the tax effects of all intra-entity sales of assets other than inventory to be recognized in the period in which the transaction occurs. The guidance will be effective for the Company for the quarter ending December 31, 2018 with early adoption permitted but only in the first interim period of a fiscal year. The changes are required to be applied by means of a cumulative-effect adjustment recorded in retained earnings as of the beginning of the fiscal year of adoption.  The Company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

In February 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires the disaggregation of the service cost component from other components of net periodic benefit cost, clarifies how to present the service cost component and other components of net benefit costs in the Statements of Consolidated Operations and allows only the service cost component of net benefit costs to be eligible for capitalization. This ASU is effective for the Company for the quarter ending December 31, 2018. Adoption will be applied on a retrospective basis for the presentation of all components of net periodic benefit costs and on a prospective basis for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The company is currently evaluating the impact this guidance will have on the Consolidated financial statements and related disclosures.

In May 2017, the FASB issued ASU 2017‑09, Scope of Modification Accounting, which amended Accounting Standards Code Topic 718. FASB issued ASU 2017‑09 to reduce the cost and complexity when applying Topic 718 and standardize the practice of applying Topic 718 to financial reporting. The ASU was not developed to fundamentally change the definition of a modification, but instead to provide guidance for what changes would qualify as a modification. ASU No. 2017‑09 will be effective for us for the quarter ending December 31, 2018. The company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

Accounting Pronouncements Recently Adopted

The Company adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends ASC Topic 718, Compensation – Stock Compensation as of October 1, 2017. The ASU includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. The adoption of this ASU did not have a significant impact on the Company's Consolidated financial statements.

In January 2017, the FASB issued ASU 2017‑04, Simplifying the Test for Goodwill Impairment. This ASU simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures goodwill impairment loss by comparing the implied value of a reporting unit’s goodwill with the carrying amount of that goodwill. The amendments in this ASU are effective for the Company for the quarter ending December 31, 2020. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. ASU 2017-04 was early adopted by the Company for the year beginning October 1, 2017 and did not have a material impact on the Company's Consolidated financial statements.

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3. Acquisitions and Divestitures

Acquisitions support the Company's strategy of delivering a broad solutions portfolio with robust technology across multiple geographies and end markets. The following acquisitions were made during the three months ended March 31, 2018.

The Company acquired Pure Water Solutions on January 31, 2018, a provider of high-purity water equipment and systems, service deionization and resin regeneration, with service operations in suburban Denver, CO and Santa Fe, NM for $4,699; $3,706 cash at closing with a maximum earn out payment of $993 to be paid out twelve months after the closing. The fair value of earn out payments at the date of acquisition was $461. Pure Water Solutions is part of a part of the Industrial Segment, and will extend the Company’s service network.

On March 9, 2018, the Company acquired Pacific Ozone Technology, Inc, a provider of advanced ozone disinfection systems, testing products and support services $8,557; $6,557 cash at closing; with up to another $2,000 of earn out payments to be paid out over three years after the closing. Pacific Ozone, based in Benecia, CA, is part of the Products Segment and adds a new technology, ozone disinfection, to the portfolio and further enhances the Company's ability in the industrial water treatment and aquatics market.

Pro forma results for acquisitions completed during the three months ended March 31, 2018 were determined to not be material.

The preliminary opening balance sheet for the acquisitions is summarized as follows.

	Pure Water			Pacific Ozone			Total
Current assets	$	277		$	1,418		$	1,695
Property, plant and equipment	175			192			367
Goodwill	2,369			5,863			8,232
Intangible assets	1,488			—			1,488
Total assets acquired	4,309			7,473			11,782
Total liabilities assumed	(154		)	(916		)	(1,070		)
Net assets acquired	$	4,155		$	6,557		$	10,712

4. Fair Value Measurements

As of September 30, 2017 and March 31, 2018, the fair values of cash and cash equivalents, accounts receivable and accounts payable approximate carrying values due to the short maturity of these items.

The Company measures the fair value of pension plan assets and liabilities, deferred compensation plan assets and liabilities on a recurring basis pursuant to ASC Topic 820. ASC Topic 820 establishes a three‑tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include:

Level 1: Quoted prices for identical instruments in active markets.

Level 2: Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model‑derived valuations whose inputs are observable or whose significant value driver is observable.

Level 3: Unobservable inputs in which little or no market data is available, therefore requiring an entity to develop its own assumptions.

The following table presents the Company’s financial assets and liabilities at fair value. The fair values related to the pension plan assets are determined using net asset value (NAV) as a practical expedient, or by information

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categorized in the fair value hierarchy level based on the inputs used to determine fair value. The reported carrying amounts of deferred compensation plan assets and liabilities and debt approximate their fair values. The Company uses interest rates and other relevant information generated by market transactions involving similar instruments to fair value these assets and liabilities, therefore all are classified as Level 2 within the valuation hierarchy.

	Net Asset Value		Quoted Market Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
As of September 30, 2017
Assets:
Pension plan
Cash	$	—	$	16,024	$	—		$	—
Government Securities	3,206		—		—			—
Liability Driven Investment	2,754		—		—			—
Guernsey Unit Trust	932		—		—			—
Global Absolute Return	2,139		—		—			—
Deferred compensation plan assets
Trust Assets	—		2,146		—			—
Insurance	—		—		17,396			—
Liabilities:
Pension plan	—		—		(34,803		)	—
Deferred compensation plan liabilities	—		—		(21,159		)	—
Long‑term debt	—		—		(912,471		)	—
As of March 31, 2018
Assets:
Pension plan
Cash	$	—	$	16,559	$	—		$	—
Government Securities	3,229		—		—			—
Liability Driven Investment	3,490		—		—			—
Guernsey Unit Trust	999		—		—			—
Global Absolute Return	2,235		—		—			—
Deferred compensation plan assets
Trust Assets	—		947		—			—
Insurance	—		—		17,905			—
Liabilities:
Pension plan	—		—		(34,803		)	—
Deferred compensation plan liabilities	—		—		(20,945		)	—
Long‑term debt	—		—		(806,361		)	—

The pension plan assets and liabilities and deferred compensation plan assets and liabilities are included in other non-current assets and other non-current liabilities at September 30, 2017 and March 31, 2018.

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5. Accounts Receivable

Accounts receivable are summarized as follows:

	September 30, 2017			March 31, 2018
Accounts Receivable	$	248,742		$	222,075
Allowance for Doubtful Accounts	(3,494		)	(4,223		)
Receivables, net	$	245,248		$	217,852

6. Inventories

The major classes of inventory, net are as follows:

	September 30, 2017			March 31, 2018
Raw materials and supplies	$	64,113		$	68,350
Work in progress	16,425			21,350
Finished goods and products held for resale	44,402			52,222
Costs of unbilled projects	5,706			5,407
Reserves for excess and obsolete	(10,599		)	(11,078		)
	$	120,047		$	136,251

7. Property, Plant, and Equipment

Property, plant, and equipment consists of the following:

	September 30, 2017			March 31, 2018
Machinery and equipment	$	338,056		$	356,277
Land and buildings	84,282			85,786
Construction in process	24,788			35,446
	447,126			477,509
Less: accumulated depreciation	(167,083		)	(191,822		)
	$	280,043		$	285,687

Depreciation expense was $12,958 and $13,980 for the three months ended March 31, 2017 and 2018, respectively. Maintenance and repair expense was $5,354 and $5,567 for the three months ended March 31, 2017 and 2018, respectively.

Depreciation expense was $25,385 and $27,987 for the six months ended March 31, 2017 and 2018, respectively. Maintenance and repair expense was $10,510 and $11,382 for the six months ended March 31, 2017 and 2018, respectively.

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8. Goodwill

Changes in the carrying amount of goodwill are as follows:

	Industrial			Municipal		Products			Total
Balance at September 30, 2017	$	128,190		$	9,865	$	183,858		$	321,913
Business combinations	2,369			—		5,863			8,232
Measurement period adjustment	—			—		(314		)	(314		)
Foreign currency translation	(373		)	96		344			67
Balance at March 31, 2018	$	130,186		$	9,961	$	189,751		$	329,898

As of September 30, 2017 and March 31, 2018, $139,581 and $139,340, respectively, of goodwill is deductible for tax purposes.

The Neptune Benson reporting unit fair value excess was approximately 3.0% above the carrying value as of the date of valuation on July 1, 2017. The Company continues to monitor this reporting unit and noted no events that would cause a revaluation during the three months ending March 31, 2018.

All other reporting units significantly exceeded their carrying value and as such, no further analysis was performed.

9. Debt

Long‑term debt consists of the following:

	September 30, 2017			March 31, 2018
First Lien Term Loan Facility, due December 20, 2024	$	896,574		$	792,591
Revolving Credit Facility	—			—
Build Own Operate Financing, due June 30, 2024	6,930			6,423
Notes Payable, due June 30, 2018 to July 31, 2023	3,287			2,592
Total debt	906,791			801,606
Less unamortized discount and lender fees	(16,942		)	(14,565		)
Total net debt	889,849			787,041
Less current portion	(11,325		)	(11,057		)
Total long‑term debt	$	878,524		$	775,984

Term Loan Facilities and Revolving Credit Facility

On January 15, 2014, EWT Holdings III Corp. (EWT III), an indirect wholly-owned subsidiary of the Company, entered into a First Lien Credit Agreement and Second Lien Credit Agreement (the Credit Agreements) among EWT III, EWT Holdings II Corp., the lenders party thereto and Credit Suisse AG as administrative agent and collateral agent. The First Lien Credit Agreement provided for a seven-year term loan facility, and the Second Lien Credit Agreement provided for an eight-year term loan facility. The term loan facilities originally consisted of the “First Lien Term Loan” and “Second Lien Term Loan” in aggregate principal amounts of $505,000 and $75,000, respectively.  The First Lien Credit Agreement also made available to the Company a $75,000 revolving credit facility (the Revolver), which provided for a letter of credit sub-facility up to $35,000. During the year ending September 30, 2017, certain subsidiaries of the Company entered into three amendments to the First Lien Credit Agreement, which provided for, among other things, the payoff and termination of the Second Lien Term Loan, upsizes to the First Lien Term Loan, and the upsize of the Revolver.

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On December 20, 2017, certain subsidiaries of the Company entered into Amendment No. 5 (the Fifth Amendment), among EWT III, as the borrower, certain other subsidiaries of the Company, and Credit Suisse AG, as administrative agent and collateral agent, relating to the First Lien Credit Agreement (as amended, amended and restated, extended, supplemented or otherwise modified from time to time prior to the effectiveness of the Fifth Amendment, the "Existing Credit Agreement"). Prior to the Fifth Amendment, approximately $796,574 was outstanding under the First Lien Term Loan (the Existing Term Loans).  Pursuant to the Fifth Amendment, among other things, the Existing Term Loans were refinanced with the proceeds of refinancing Term Loans. Borrowings under the First Lien Term Loan Facility (First Lien Term Loan) bear interest consisting of the Base Rate plus 2.0%, or LIBOR plus 3.0%. At March 31, 2018, the interest rate on borrowings was 4.69%, comprised of 1.69% LIBOR plus the 3.0% spread. The principal and interest under the First Lien Term Loan is payable in quarterly installments, with quarterly principal payments of $1,991, and the balance is due at maturity on December 20, 2024. 

Total deferred fees related to the First Lien Term Loan were $16,942 and $14,565, net of amortization, as of September 30, 2017 and March 31, 2018, respectively.  These fees were included as a contra liability to debt on the Condensed Consolidated Balance Sheets.

The Fifth Amendment, among other things, extended the maturity of the Existing Term Loan to December 20, 2024 from January 15, 2021, reduced the interest rate spreads on Term Loan borrowing to to 3.00% from 3.75%, and increased the revolving credit commitment and letter of credit sublimit to $125,000 and $45,000 from $95,000 and $35,000, respectively. 

The Fifth Amendment bifurcated the Revolver, with $87,500 of the $125,000 revolver capacity maturing on December 20, 2022 (the 2022 Borrowings), and the remaining $37,500 maturing on January 15, 2019 (the “2019 Borrowings”).  Borrowings under the Revolver bear interest at variable rates plus a margin ranging from 200 to 325 basis points, and 150 to 275 basis points for 2019 and 2022 Borrowings, respectively, dependent upon the Company’s leverage ratio and variable rate selected.  2022 Base Rate borrowings under the Revolver would have incurred interest at 6.5% as of March 31, 2018, calculated as the 175 basis point spread plus the Base Rate of 4.75%.  2019 Base Rate borrowings under the Revolver at September 30, 2017 and March 31, 2018 would have incurred interest at 6.5% and 7%, respectively, calculated as the 225 basis point spread plus the Base Rate of 4.25% at September 30, 2017 and 4.75% at March 31, 2018.

The Company had borrowing availability under the Revolver of $95,000 and $125,000 at September 30, 2017 and March 31, 2018, respectively, reduced for outstanding letter of credit guarantees. Such letter of credit guarantees are subject to a $45,000 sublimit within the Revolver, increased from $35,000 as part of the Fifth Amendment.  The Company’s outstanding letter of credit guarantees under this agreement aggregated approximately $6,706 and $20,612, at September 30, 2017, and March 31, 2018, respectively. The Company had no outstanding revolver borrowings as of September 30, 2017, and March 31, 2018, and unused amounts, defined as total revolver capacity less outstanding letters of credit and revolver borrowings, of $88,294 and $104,388, respectively. At September 30, 2017 and March 31, 2018, the Company had additional letters of credit of $10,568 and $51 issued under a separate arrangement, respectively.

  The First Lien Credit Agreement contains limitations on incremental borrowings, is subject to leverage ratios and allows for optional prepayments. Under certain circumstances beginning with fiscal 2015 results of operations, the Company may be required to remit excess cash flows as defined based upon exceeding certain leverage ratios. The Company did not exceed such ratios during fiscal 2017, does not anticipate exceeding such ratios during the fiscal year 2018, and therefore does not anticipate any additional repayments during the fiscal year 2018.

Build Own Operate Financing

On June 30, 2017, the Company completed a Build Own Operate financing for $7,100.  The Company incurred $50 of additional financing fees related to this transaction, which have been capitalized and are included as a contra liability on the balance sheet. This financing fully amortizes over the seven-year tenure and incurs interest at a rate of one-month LIBOR plus 300 basis points. This variable rate debt has been fixed at a rate of 5.08% per annum. Principal obligations are $254 per quarter. The Company had $6,930 and $6,423 principal outstanding under this facility at September 30, 2017 and March 31, 2018, respectively.

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Notes Payable

As of September 30, 2017 and March 31, 2018, the Company had notes payable in an aggregate outstanding amount of $3,287 and $2,592, respectively, with interest rates ranging from 6.26% to 7.39%, and due dates ranging from June 30, 2018 to July 31, 2023. These notes are related to certain equipment related contracts and are secured by the underlying equipment and assignment of the related contracts.

Repayment Schedule

Aggregate maturities of all long‑term debt, including current portion of long‑term debt and excluding capital lease obligations as of March 31, 2018, are presented below:

Fiscal Year
Remainder of 2018	$	4,978
2019	9,503
2020	9,402
2021	9,429
2022	9,459
Thereafter	758,835
Total	$	801,606

10. Product Warranties

The Company accrues warranty obligations associated with certain products as revenue is recognized. Provisions for the warranty obligations are based upon historical experience of costs incurred for such obligations, adjusted for site‑specific risk factors, and, as necessary, for current conditions and factors. There are significant uncertainties and judgments involved in estimating warranty obligations, including changing product designs, differences in customer installation processes and future claims experience which may vary from historical claims experience.

A reconciliation of the activity related to the accrued warranty, including both the current and long‑term portions, is as follows:

	Six Months Ended March 31,
	2017		2018
Balance at beginning of the period	$	23,309	$	17,274
Warranty provision for sales	3,245		2,386
Settlement of warranty claims	(7,657)		(7,559)
Foreign currency translation and other	(413)		435
Balance at end of the period	$	18,484	$	12,536

The decline in accrued warranty over the periods presented is attributable to improved product quality and better project execution, as well as the expiration of warranty periods for certain specific exposures related to discontinued products.

11. Restructuring and Related Charges

To better align its resources with its growth strategies and reduce the cost structure, the Company commits to restructuring plans as necessary. The Company initiated a Voluntary Separation Plan (VSP) during the year ended

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September 30, 2016, that continued throughout fiscal year 2017 and concluded during the six months ended March 31, 2018. The VSP plan includes severance payments to employees as a result of streamlining business operations for efficiency, elimination of redundancies, and reorganizing business processes. In addition, the Company has undertaken various other restructuring initiatives, including the wind down of the Company’s operations in Italy, restructuring of the Company’s operations in Australia, consolidation of functional support structures on a global basis, and consolidation of the Singaporean research and development center. The table below sets forth the amounts accrued for the restructuring components and related activity:

	Six Months Ended March 31,
	2017		2018
Balance at beginning of the period	$	13,217	$	3,542
Restructuring charges related to VSP	15,431		320
Charges related to other initiatives	3,295		5,964
Write off charge and other non‑cash activity	(374)		(308)
Cash payments	(24,325)		(9,095)
Other adjustments	(159)		28
Balance at end of the period	$	7,085	$	451

The balances for accrued restructuring liabilities at September 30, 2017 and March 31, 2018 are recorded in Accrued expenses and other liabilities. The Company expects to incur another $5,012 of restructuring charges during the remaining of fiscal year 2018. Restructuring charges primarily represent severance charges and of the amounts incurred above, $8,141, $4,874, $5,377, and $334 were included in Cost of product sales and services, General and administration expense, Sales and marketing expense and Research and development expense, respectively, during the six months ended March 31, 2017. During the six months ended March 31, 2018, $1,936, $3,113, $733, and $503 were included in Cost of product sales and services, General and administration expense, Sales and marketing expense and Research and development expense, respectively. The Company continues to evaluate restructuring activities that may result in additional charges in the future.

12. Employee Benefit Plans

The Company maintains multiple employee benefit plans.

Certain of the Company’s employees in the UK were participants in a Siemens defined benefit plan established for employees of a UK-based operation acquired by Siemens in 2004. The plan was frozen with respect to future service credits for active employees, however the benefit formula recognized future compensation increases. The Company agreed to establish a replacement defined benefit plan, with the assets of the Siemens scheme transferring to the new scheme on April 1, 2015.

The Company’s employees in Germany also participate in a defined benefit plan. Assets equaling the plan’s accumulated benefit obligation were transferred to a German defined benefit plan sponsored by the Company upon the acquisition of EWT from Siemens. The German entity also sponsors a defined benefit plan for a small group of employees located in France.

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Pension expense for the German and UK plans were as follows:

	Three Months Ended March 31,
	2017		2018
Service cost	$	267	$	243
Interest cost	82		123
Expected return on plan assets	(40)		(32)
Amortization of actuarial losses	188		79
Pension expense for defined benefit plans	$	497	$	413
	Six Months Ended March 31,
	2017		2018
Service cost	$	518	$	475
Interest cost	159		241
Expected return on plan assets	(78)		(63)
Amortization of actuarial losses	364		155
Pension expense for defined benefit plans	$	963	$	808

13. Income Taxes

The income tax provision for interim periods is comprised of tax on ordinary income (loss) provided at the most recent estimated annual effective tax rate, adjusted for the tax effect of discrete items. Management estimates the annual effective tax rate each quarter based on the forecasted annual pretax income or (loss) of its U.S. and non-U.S. operations. Items unrelated to current year ordinary income or (loss) are recognized entirely in the period identified as a discrete item of tax. Discrete items generally relate to changes in tax laws, adjustments to prior year’s actual liability determined upon filing tax returns, adjustments to previously recorded reserves for uncertain tax positions, initially recording or fully reversing valuation allowances, and excess stock compensation deductions.

Effects of the Tax Cuts and Jobs Act

New tax legislation, commonly referred to as the Tax Cuts and Jobs Act (Tax Act), was enacted on December 22, 2017. ASC 740, Accounting for Income Taxes, requires companies to recognize the effect of tax law changes in the period of enactment even though the effective date for most provisions is for tax years beginning after December 31, 2017, or in the case of certain other provisions, January 1, 2018. Though certain key aspects of the new law are effective January 1, 2018 and have an immediate accounting effect, other significant provisions are not yet effective or may not result in accounting effects for September 30 fiscal year companies until October 1, 2018.

The SEC issued Staff Accounting Bulletin No. 118 (SAB 118), which allows registrants to record provisional amounts during a one year “measurement period” similar to that used when accounting for business combinations. During the measurement period, impacts of the law are expected to be recorded at the time a reasonable estimate for all or a portion of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared or analyzed. SAB 118 applies to measuring the impact of tax laws effecting the period of enactment, such as the change in tax rate to 21%, and does not extend to changes as part of the Tax Act that are not effective until after December 31, 2017, such as U.S. taxation of certain global intangible low-taxed income (GILTI).

The SAB summarizes a three-step process to be applied at each reporting period to account for and qualitatively disclose: (1) the effects of the change in tax law for which accounting is complete; (2) provisional amounts (or adjustments to provisional amounts) for the effects of the tax law where accounting is not complete, but that a reasonable estimate has been determined; and (3) that a reasonable estimate cannot yet be made and therefore taxes are reflected in accordance with law prior to the enactment of the Tax Cuts and Jobs Act.

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Amounts recorded where accounting is complete in the six months ended March 31, 2018 principally relate to the reduction in the U.S. corporate income tax rate to 21%, which resulted in the Company reporting an income tax benefit of $3,641 to remeasure deferred taxes liabilities associated with indefinitely lived intangible assets that will reverse at the new 21% rate. Absent this deferred tax liability, the Company is in a net deferred tax asset position that is offset by a full valuation allowance. Though the impact of the rate change has a net tax effect of zero, the accounting to determine the gross change in the deferred tax position and the offsetting valuation is not yet complete.

The new law includes a one-time mandatory repatriation transition tax on the net accumulated earnings and profits of a U.S. taxpayer’s foreign subsidiaries. The Company has performed a preliminary analysis, and as a result of an expected overall accumulated deficit, it is not likely that the Company will have a liability for the transition tax. Therefore, the accounting for this matter is provisional until the accumulated earnings and profits analysis is finalized in fiscal 2018.

The Tax Act introduces other new provisions that are effective January 1, 2018 and changes how certain provisions are calculated for fiscal years ending September 30, 2018. These provisions include additional limitations on certain meals and entertainment expenses, and the inclusion of commissions and performance based compensation in determining the excessive compensation limitation applicable to certain employees. We do not expect these new provisions to have a material impact to the Company’s tax expense.

Other significant provisions that are not yet effective but may impact income taxes in future years include: an exemption from U.S. tax on dividends of future foreign earnings, a limitation on the current deductibility of net interest expense in excess of 30% of adjusted taxable income, a limitation on the use of net operating losses generated after fiscal 2018 to 80% of taxable income, an incremental tax (base erosion anti-abuse tax or BEAT) on excessive amounts paid to foreign related parties, and an income inclusion for foreign earnings in excess of 10% of the foreign subsidiaries tangible assets (GILTI). The company is still evaluating whether to make a policy election to treat the GILTI tax as a period expense or to provide U.S. deferred taxes on foreign temporary differences that are expected to generate GILTI income when they reverse in future years.

Annual Effective Tax Rate

The full year estimated annual effective tax rate, which excludes the impact of discrete items, was 63.1% and 13.0% as of the six months ended March 31, 2017 and 2018 and is reconciled to the U.S. statutory rate as follows.

For the six months ended March 31, 2017, the estimated annual effective tax rate of 63.1% was higher than the U.S federal statutory rate of 35.0% primarily due to a tax charge associated with indefinite deferred tax liabilities that were not offset by a valuation allowance. Other contributing factors were the mix of U.S. and non-U.S. income, and the statutory tax rates at which each is taxed, as well as permanently disallowed interest in certain foreign jurisdictions.

For the six months ended March 31, 2018, the U.S. federal statutory rate of 24.5% is a blended rate based upon the number of days in fiscal 2018 that the company will be taxed at the former statutory rate of 35.0% and the number of days that it will be taxed at the new rate of 21.0%. The estimated annual effective tax rate of 13.0% differs from this blended U.S. federal statutory rate principally due to higher forecasted earnings in the U.S. and certain non-U.S. jurisdictions that permitted the realization of net deferred tax assets which were previously impaired with a valuation allowance. The reduction in the U.S. statutory rate has lessened the impact of foreign statutory tax rate differences as a significant portion of the Company’s foreign income is in jurisdictions with a similar or slightly higher tax rate than 24.5%.

Prior and Current Period Tax Expense

For the six months ended March 31, 2017, income tax benefits of $11,907 as a percentage of pretax losses of $20,212 were 58.9%.   This is slightly less than the estimated annual effective tax rate of 63.1% as a result of discrete tax expense related to adjustments to the prior year actual liability upon the filing of certain foreign income tax returns during the period.

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For the six months ended March 31, 2018, the Company recognized an income tax benefit of $2,393, which as a percentage of pretax income of $7,582 was 31.6%. This amount differs from the estimated annual effective tax rate of 13.0% as a result of a discrete tax benefit of $3,641 due to the remeasurement of U.S. deferred tax liabilities associated with indefinite lived intangible assets for the reduction in the U.S. statutory rate from 35.0% to 21.0%. Other discrete items were not material.

The Company projects to maintain a full valuation on U.S. federal and state net deferred tax assets (excluding the tax effects of deferred tax liabilities associated with indefinite lived intangibles) for the year ending September 30, 2018 as a result of pretax losses incurred since the Company’s inception in early 2014. Though the Company reported positive earnings for the first time in 2017 and is projecting earnings in 2018, management believes it is prudent to retain a valuation allowance until a more consistent pattern of actual earnings is established and net operating loss carryforwards begin to be utilized.

There are no amounts of unrecognized tax benefits recorded for the six months ended March 31, 2017 and 2018. Management does not reasonably expect any significant changes to unrecognized tax benefits within next twelve months of the reporting date. U.S. federal, state and foreign tax returns remain open to examination for the year ended September 30, 2014 and forward.

14. Share-Based Compensation

In connection with the IPO, the Board adopted and the Company's stockholders approved the Evoqua Water Technologies Corp. 2017 Equity Incentive Plan (or the Equity Incentive Plan), under which equity awards may be made in the respect of 5,100 shares of common stock of the Company. Under the Equity Incentive Plan, awards may be granted in the form of options, restricted stock, restricted stock units, stock appreciation rights, dividend equivalent rights, share awards and performance-based awards (including performance share units and performance-based restricted stock).

Share-based compensation expense was $554 and $4,250 during the three months ended March 31, 2017 and 2018, and $1,020 and $6,862 during the six months ended March 31, 2017 and 2018, respectively. The unrecognized compensation expense related to stock options and restricted stock units was $3,073 and $20,230, respectively at March 31, 2018, and is expected to be recognized over a weighted average period of 3.8 years and 1.6 years, respectively. No cash was received from the exercise of stock options during the three months ended March 31, 2018, as such activity was part of a cashless net exercise.

Option awards vest rateably at 25% per year, and are exercisable at the time of vesting. The options granted have a ten-year contractual term.

    A summary of the stock option activity as of March 31, 2018 is presented below (amounts in thousands except per share amounts):

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	Options		Weighted Average Exercise Price/Share		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2017	9,060		$	5.18	7.5 years	$	11,011
Granted	34		24.25
Exercised	(1,018	)	4.74
Forfeited	(87	)	7.65
Expired	—		—
Outstanding at March 31, 2018	7,989		5.29		7.9 years	$	10,045
Options exercisable at March 31, 2018	5,516		$	4.87	6.5 years	$	5,569

The total intrinsic value of options exercised (which is the amount by which the stock price exceeded the exercise price of the options on the date of exercise) during the six months ended March 31, 2018 was $18,988.

A summary of the status of the Company's non-vested stock options as of and for the six month period ended March 31, 2018 is presented below.

	Shares		Weighted Average Grant Date Fair Value/Share
Nonvested at September 30, 2017	4,300		$	1.36
Granted	34
Vested	(1,774	)	1.07
Forfeited	(87	)	2.00
Nonvested at March 31, 2018	2,473		$	1.59

The total fair value of options vested during the six months ended March 31, 2018, was $1,670.

Restricted Stock Units

In addition to the establishment of the Equity Incentive Plan, in connection with the IPO, the Company entered into restricted stock unit (“RSU”) agreements with each of the executive officers and certain other key members of management. Pursuant to the RSU agreements, recipients received, in the aggregate, 1,197 stock-settled RSUs, the aggregate value of which equals $25,000. The RSUs will vest and settle in full upon the second anniversary of the IPO (the “Vesting Date”).

The following is a summary of the RSU activity for the six months endedMarch 31, 2018.

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	Shares		Weighted Average Grant Date Fair Value/Share
Outstanding at September 30, 2017	—		$	—
Granted	1,201		20.89
Forfeited	(4	)	20.88
Outstanding at March 31, 2018	1,197		$	20.89

15. Concentration of Credit Risk

The Company’s cash and cash equivalents and accounts receivable are potentially subject to concentration of credit risk. Cash and cash equivalents are placed with financial institutions that management believes are of high credit quality. Accounts receivable are derived from revenue earned from customers located in the U.S. and internationally and generally do not require collateral. The Company’s trade receivables do not represent a significant concentration of credit risk at September 30, 2017 and March 31, 2018 due to the wide variety of customers and markets into which products are sold and their dispersion across geographic areas. The Company does perform ongoing credit evaluations of its customers and maintains an allowance for potential credit losses on trade receivables. As of and for the three and six months endedMarch 31, 2017 and 2018, no customer accounted for more than 10% of net sales or net accounts receivable.

The Company operates predominantly in seven countries worldwide and provides a wide range of proven product brands and advanced water and wastewater treatment technologies, mobile and emergency water supply solutions and service contract options through its Industrial, Municipal, and Products segments. The Company is a multi-national business but its sales and operations are primarily in the U.S. Sales to unaffiliated customers are based on the Company locations that maintain the customer relationship and transacts the external sale.

16. Related‑Party Transactions

Transactions with Investors

The Company paid an advisory fee of $1,000 per quarter to AEA Investors LP (AEA), the private equity firm and ultimate majority shareholder. Upon the IPO, the Company stopped paying these fees to AEA and as a result, only paid $333 during the three and six months endedMarch 31, 2018. In addition, the Company reimbursed AEA for normal and customary expenses incurred by AEA on behalf of the Company. The Company incurred expenses, excluding advisory fees, of $57 and $43 in the six months ended March 31, 2017 and 2018, respectively. The amounts owed to AEA were $38 and $0 at September 30, 2017 and March 31, 2018, respectively, and were included in Accrued expenses and other liabilities.

AEA, through two of its affiliated funds, is one of the lenders in the First Lien Term Loan Facility and had a commitment of $16,218 and $14,337 at September 30, 2017 and March 31, 2018, respectively.

The Company also has a related party relationship with one of its customers, who is also a shareholder of the Company. The Company had sales to this customer of $1,389 and $289 during the three months ended March 31, 2017 and 2018, and $1,564 and $585 during the six months ended March 31, 2017 and 2018, respectively, and was owed $2,354 and $1,063 from them at September 30, 2017 and March 31, 2018, respectively.

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17. Commitments and Contingencies

Operating Leases

The Company occupies certain facilities and operates certain equipment and vehicles under non‑cancelable lease arrangements. Lease agreements may contain lease escalation clauses and purchase and renewal options. The Company recognizes scheduled lease escalation clauses over the course of the applicable lease term on a straight-line basis in the Consolidated Statement of Operations.

Total rent expense was $4,360 and $4,817 for the three months ended March 31, 2017 and 2018, respectively, and $8,833 and $9,754 for the six months endedMarch 31, 2017 and 2018, respectively.

Future minimum aggregate rental payments under non-cancelable operating leases are as follows:

	Operating Leases
Fiscal Year
Remainder of 2018	$	5,497
2019	9,920
2020	8,456
2021	6,459
2022	4,121
Thereafter	10,275
Total	$	44,728

Capital Leases

The gross and net carrying values of the equipment under capital leases was $43,727 and $30,302, respectively, as of September 30, 2017 and was $48,146 and $30,613, respectively, as of March 31, 2018 and are recorded in Property, plant and equipment, net.

The following is a schedule showing the future minimum lease payments under capital leases by years and the present value of the minimum lease payments as of March 31, 2018.

	Capital Leases
Fiscal Year
Remainder of 2018	$	5,278
2019	9,757
2020	8,166
2021	5,082
2022	3,194
Thereafter	1,860
Total	33,337
Less amount representing interest (at rates ranging from 2.15% to 3.65%)	2,196
Present value of net minimum capital lease payments	31,141
Less current installments of obligations under capital leases	10,728
Obligations under capital leases, excluding current installments	$	20,413

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The current installments of obligations under capital leases are included in Accrued expenses and other liabilities. Obligations under capital leases, excluding current installments, are included in other non-current liabilities.

The Company is a lessor to multiple parties. The Company purchases equipment through internal funding or bank debt equal to the fair market value of the equipment. The equipment is then leased to customers for periods ranging from five to twenty years. As of March 31, 2018, future minimum lease payments receivable under operating leases are as follows:

	Operating Leases
Fiscal year
Remainder of 2018	$	3,147
2019	6,107
2020	7,257
2021	5,547
2022	5,395
Thereafter	63,356
Future minimum lease payments	$	90,809

Guarantees

From time to time, the Company is required to provide letters of credit, bank guarantees, or surety bonds in support of its commitments and as part of the terms and conditions on water treatment projects.  In addition, the Company is required to provide letters of credit or surety bonds to the department of environmental protection or equivalent in some states in order to maintain its licenses to handle toxic substances at certain of its water treatment facilities.

These financial instruments typically expire after all Company commitments have been met, a period typically ranging from twelve months to ten years, or more in some circumstances.  The letters of credit, bank guarantees, or surety bonds are arranged through major banks or insurance companies. In the case of surety bonds, the Company generally indemnifies the issuer for all costs incurred if a claim is made against the bond. 

As of September 30, 2017 and March 31, 2018 and the Company had letters of credit totaling $17,274 and $20,663, respectively, and surety bonds totaling $87,849 and $98,820, respectively, outstanding under the Company’s credit arrangements.  The longest maturity date of the letters of credit and surety bonds in effect as of March 31, 2018 was March 31, 2024. Additionally, as of September 30, 2017 and March 31, 2018, the Company had letters of credit totaling $901 and $922, respectively, and surety bonds totaling $12,970 and $5,570, respectively, outstanding under the Company’s prior arrangement with Siemens.

Litigation

From time to time, the Company is subject to various claims, charges and litigation matters that arise in the ordinary course of business. The Company believes these actions are a normal incident of the nature and kind of business in which the Company is engaged. While it is not feasible to predict the outcome of these matters with certainty, the Company does not believe that any asserted or unasserted legal claims or proceedings, individually or in the aggregate, will have a material adverse effect on its business, financial condition, results of operations or prospects.

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18. Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consisted of the following:

	September 30, 2017		March 31, 2018
Salaries, wages and other benefits	$	52,116	$	30,287
Severance payments	3,542		451
Taxes, other than income	9,244		10,289
Obligations under capital leases	9,777		10,728
Third party commissions	6,968		4,810
Insurance liabilities	4,915		5,640
Provisions for litigation	4,715		1,117
Earn outs related to acquisitions	4,304		4,765
Other	26,342		23,911
	$	121,923	$	91,998

The reduction in Accrued Expenses and Other Liabilities is primarily due to timing of cash payments for various employee-related liabilities, along with the payment of accrued expenses related to the IPO during the six months ended March 31, 2018.

19. Business Segments

The Company has three reportable segments – Industrial, Municipal and Products. The key factors used to identify these reportable segments are the organization and alignment of the Company’s internal operations, the nature of the products and services, and customer type. The business segments are described as follows:

Industrial combines equipment and services to improve operational reliability and environmental compliance for heavy and light industry, commercial and institutional markets. Their customers span industries including hydrocarbon refineries, chemical processing, power, food and beverage, life sciences, health services and microelectronics.

Municipal helps engineers and municipalities meet new demands for plant performance through leading equipment, solutions and services backed by trusted brands and over 100 plus years of applications experience. Their customers include waste water and drinking water collection and distribution systems, utility operators. Their services include odor control services.

Products has distinct business operating units. Each has a unique standard product built on well-known brands and technologies that are sold globally through multiple sales and aftermarket channels. Additionally, Products also offers industrial, municipal and water recreational users with well-known brands that improve operational reliability and environmental compliance. Their customers include original equipment manufacturers, regional and global distributors, engineering, procurement and contracting customers, and end users in the municipal, industrial and commercial industries, including hotels, resorts, colleges, universities, waterparks, aquariums and zoos.

The Company evaluates its business segments’ operating results based on earnings before interest, taxes, depreciation and amortization. Corporate activities include general corporate expenses, elimination of intersegment transactions, interest income and expense and other unallocated charges. Unallocated charges include certain restructuring and other business transformation charges that have been undertaken to align and reposition the Company to the current reporting structure, acquisition related costs (including transaction costs, certain integration costs and recognition of backlog intangible assets recorded in purchase accounting) and stock-based compensation charges.

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Since certain administrative and other operating expenses and other items have not been allocated to business segments, the results in the below table are not necessarily a measure computed in accordance with generally accepted accounting principles and may not be comparable to other companies.

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	Three Months Ended March 31,						Six Months Ended March 31,
	2017			2018			2017			2018
Total sales
Industrial	$	161,505		$	183,949		$	308,510		$	352,217
Municipal	68,694			73,498			138,080			142,811
Products	87,939			98,237			166,906			180,007
Total sales	318,138			355,684			613,496			675,035
Intersegment sales
Industrial	1,048			2,690			2,347			5,764
Municipal	5,140			9,214			11,895			16,621
Products	12,048			10,091			19,480			21,909
Total intersegment sales	18,236			21,995			33,722			44,294
Sales to external customers
Industrial	160,457			181,259			306,163			346,453
Municipal	63,554			64,284			126,185			126,190
Products	75,890			88,147			147,425			158,097
Total sales	299,901			333,690			579,773			630,740
Earnings before interest, taxes, depreciation and amortization (EBITDA)
Industrial	35,373			41,713			67,374			81,840
Municipal	8,526			9,758			17,088			16,350
Products	16,956			22,972			31,855			33,646
Corporate	(30,001		)	(28,155		)	(72,358		)	(55,838		)
Total EBITDA	30,854			46,288			43,959			75,998
Depreciation and amortization
Industrial	9,528			10,709			18,440			20,854
Municipal	2,050			1,777			4,125			3,577
Products	3,105			3,087			6,639			6,076
Corporate	4,190			4,907			8,316			9,856
Total depreciation and amortization	18,873			20,480			37,520			40,363
Income (loss) from operations
Industrial	25,845			31,004			48,934			60,986
Municipal	6,476			7,981			12,963			12,773
Products	13,851			19,885			25,216			27,570
Corporate	(34,191		)	(33,062		)	(80,674		)	(65,694		)
Total income from operations	11,981			25,808			6,439			35,635
Interest expense	(11,898		)	(10,810		)	(26,651		)	(28,053		)
Income (loss) before income taxes	83			14,998			(20,212		)	7,582
Income tax benefit (expense)	4,812			(2,018		)	11,907			2,393
Net income (loss)	$	4,895		$	12,980		$	(8,305	)	$	9,975
Capital expenditures
Industrial	$	10,765		$	11,554		$	21,764		$	20,502
Products	1,596			1,139			2,581			2,321
Municipal	838			1,225			1,434			2,972
Corporate	367			2,495			1,450			5,875
Total capital expenditures	$	13,566		$	16,413		$	27,229		$	31,670

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	September 30, 2017		March 31, 2018
Assets
Industrial	$	461,471	$	480,435
Municipal	155,698		139,195
Products	513,941		535,792
Corporate	342,199		344,437
Total assets	$	1,473,309	$	1,499,859
Goodwill
Industrial	$	128,190	$	130,186
Municipal	9,865		9,961
Products	183,858		189,751
Total goodwill	$	321,913	$	329,898

20. Earnings Per Share

The following table sets forth the computation of basic and diluted loss from continuing operations per common share (in thousands, except per share amounts):

	Three Months Ended March 31,				Six Months Ended March 31,
	2017		2018		2017			2018
Numerator:
Numerator for basic and diluted loss per common share—Net (loss) income attributable to Evoqua Water Technologies	$	3,198	$	12,503	$	(10,401	)	$	8,790
Denominator:
Denominator for basic net (loss) income per common share—weighted average shares	104,632		113,770		104,632			113,770
Effect of dilutive securities:
Share‑based compensation	3,109		5,445		—			5,773
Denominator for diluted net loss per common share—adjusted weighted average shares	107,741		119,215		104,632			119,543
Basic (loss) income attributable to Evoqua Water Technologies per common share	$	0.03	$	0.11	$	(0.10	)	$	0.08
Diluted (loss) income attributable to Evoqua Water Technologies per common share	$	0.03	$	0.10	$	(0.10	)	$	0.07

Since the Company was in a net loss position for the six months ended March 31, 2017, there was no difference between the number of shares used to calculate basic and diluted loss per share. Because of their anti-

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dilutive effect, 8,901 common share equivalents, comprised of employee stock options, have been excluded from the diluted EPS calculation for the six months ended March 31, 2017.

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21. Subsequent Events

On April 2, 2018, the Company granted 1,325 options to certain employees of the Company and 19 restricted stock units to certain non-employee directors of the Company.

On April 9, 2018, WTG Holdings Coöperatief U.A., a wholly-owned subsidiary of the Company, completed the sale of 100% of the corporate capital of Evoqua Water Technologies S.r.l., which includes the Company’s former operations in Italy, to Giotto Water S.r.l. The aggregate purchase price paid in cash by Giotto in the transaction was €350,000, subject to certain earn out adjustments to be paid by Giotto in connection with the realization of specified tax benefits relating to previous years.

Item 2. Management’s Discussion and Analysis ofFinancial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of our operations should be read in conjunction with the condensed consolidated financial statements, including the notes, included in Item 1 of this Quarterly Report on Form 10-Q (this “Report”), and with our audited consolidated financial statements and the related notes thereto in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017, as filed with the SEC on December 4, 2017 (the “2017 Annual Report”). You should review the disclosures under the heading “Item 1A. Risk Factors” in the 2017 Annual Report, as well as any cautionary language in this report, for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis. Unless otherwise indicated or the context otherwise requires, all references to “the Company,” “Evoqua,” “Evoqua Water Technologies Corp.,” “EWT Holdings I Corp.,” “we,” “us,” “our” and similar terms refer to Evoqua Water Technologies Corp., together with its consolidated subsidiaries. Unless otherwise specified, all dollar amounts in this section are referred to in thousands.

Overview and Background

We are a leading provider of mission critical water treatment solutions, offering services, systems and technologies to support our customers’ full water lifecycle needs. With over 200,000 installations worldwide, we hold leading positions in the industrial, commercial and municipal water treatment markets in North America. We offer a comprehensive portfolio of differentiated, proprietary technology solutions sold under a number of market‑leading and well‑established brands. We deliver and maintain these mission critical solutions through the largest service network in North America assuring our customers continuous uptime with 87 branches which are located no further than a two‑hour drive from more than 90% of our customers’ sites. We believe that the customer intimacy created through our service network is a significant competitive advantage.

Our solutions are designed to provide “worry‑free water” by ensuring that our customers have access to an uninterrupted quantity and level of quality of water that meets their unique product, process and recycle or reuse specifications. We enable our customers to achieve lower costs through greater uptime, throughput and efficiency in their operations and support their regulatory compliance and environmental sustainability. We have worked to protect water, the environment and our employees for over 100 years. As a result, we have earned a reputation for quality, safety and reliability and are sought out by our customers to solve the full range of their water treatment needs, and maintaining our reputation is critical to the success of our business and solution set.

Our vision “to be the world’s first choice in water solutions” and our values of “integrity, customers and performance” foster a corporate culture that is focused on employee enablement, empowerment and accountability, which creates a highly entrepreneurial and dynamic work environment. Our purpose is “Transforming water. Enriching life.” We draw from a long legacy of water treatment innovations and industry firsts, supported by more than 1,250 granted or pending patents, which in aggregate are important to our business. Our core technologies are primarily focused on removing impurities from water, rather than neutralizing them through the addition of chemicals, and we are able to achieve purification levels which are 1,000 times greater than typical drinking water.

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Business Segments

Our business is organized by customer base and offerings into three reportable segments that each draw from the same reservoir of leading technologies, shared manufacturing infrastructure, common business processes and corporate philosophies. Our reportable segments consist of: (i) our Industrial Segment, (ii) our Municipal Segment and (iii) our Products Segment. The key factors used to identify these reportable segments are the organization and alignment of our internal operations, the nature of the products and services and customer type.

• Within the Industrial Segment, we primarily provide tailored solutions in collaboration with our customers backed by life‑cycle services including on‑demand water, build own operate (“BOO”), recycle and reuse and emergency response service alternatives to improve operational reliability, performance and environmental compliance.

• Within the Municipal Segment, we primarily deliver solutions, equipment and services to engineering firms, OEMs and municipalities to treat wastewater and purify drinking water, and to control odor and corrosion.

• Within the Products Segment, we provide a highly differentiated and scalable range of products and technologies specified by global water treatment designers, OEMs, engineering firms and integrators.

We evaluate our business segments’ operating results based on income from operations and EBITDA on a segment basis. Corporate activities include general corporate expenses, elimination of intersegment transactions, interest income and expense and other unallocated charges, which have not been allocated to business segments. As such, the segment results provided herein may not be comparable to other companies.

Organic Growth Drivers

Market Growth

We maintain a leading position among customers in growing industries that utilize water as a critical part of their operations or production processes, including pharmaceuticals and health sciences, microelectronics, food and beverage, hydrocarbon and chemical processing, power, general manufacturing, municipal drinking and wastewater, marine and aquatics. Water treatment is an essential, non‑discretionary market that is growing in importance as access to clean water has become an international priority. Underpinning this growth are a number of global, long‑term trends that have resulted in increasingly stringent effluent regulations, along with a growing demand for cleaner and sustainable waste streams for reuse. These trends include the growing global population, increasing levels of urbanization and continued global economic growth, and we have seen these trends manifest themselves within our various end markets creating multiple avenues of growth. For example, within the industrial market, water is an integral and meaningful component in the production of a wide‑range of goods spanning from consumer electronics to automobiles.

Our Existing Customer Base

We believe our strong brands, leading position in highly fragmented markets, scalable and global offerings, leading installed base and unique ability to provide complete treatment solutions will enable us to capture a larger share of our existing customers’ water treatment spend while expanding with existing and new customers into adjacent end‑markets and underpenetrated regions, including by investing in our sales force and cross‑selling to existing customers. We are uniquely positioned to further penetrate our core markets, with over 200,000 installations across over 38,000 global customers. We maintain a customer‑intimate business model with strong brand value and provide solutions‑focused offerings capable of serving a customer’s full lifecycle water treatment needs, both in current and new geographic regions.

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Our Service Model

We selectively target high value projects with opportunities for recurring business through service, parts and other aftermarket opportunities over the lifecycle of the process or capital equipment. In particular, we have developed a pipeline of smart, internet‑connected monitoring technologies through the deployment of our Water One smart water platform that provides us with an increasing ability to handle our customers’ complete water needs through on‑demand water management, predictive maintenance and service response planning. Water One also enables us to transition our customers to more accurate pricing models based on usage, which otherwise would not have been possible without technological advancement. Our technology solutions provide customers with increased stability and predictability in water‑related costs, while enabling us to optimize our service route network and on demand offerings through predictive analytics, which we believe will result in market share gains, improved service levels, increased barriers to entry and reduced costs.

Product and Technology Development

We develop our technologies through in‑house research, development and engineering and targeted tuck‑in, technology‑enhancing and geography‑expanding acquisitions. We have a reservoir of recently launched technologies and a strong pipeline of new offerings designed to provide customers with innovative, value‑enhancing solutions. Furthermore, we have successfully completed ten technology‑enhancing and geography‑expanding acquisitions since April 2016 to add new capabilities and cross‑selling opportunities in areas such as electrochemical and electrochlorination cells, regenerative media filtration, anodes, UV disinfection and aerobic and anaerobic biological treatment technologies. We are able to rapidly scale new technologies using our leading direct and third‑party sales channels and our relationships with key influencers, including municipal representatives, engineering firms, designers and other system specifiers. We believe our continued investment in driving penetration of our recently launched technologies, robust pipeline of new capabilities and best‑in‑class channels to market will allow us to continue to address our customer needs across the water lifecycle.

Operational Excellence

We believe that continuous improvement of our operations, processes and organizational structure is a key driver of our earnings growth. Since fiscal 2014, we have realigned our organizational structure, achieved significant cost savings through operational efficiencies and revitalized our culture, which has energized our workforce and reduced employee turnover. We have identified and are pursuing a number of discrete initiatives which, if successful, we expect could result in additional cost savings over the next three years. These initiatives include our ePro and supply chain improvement programs to consolidate and manage global spending, our improved logistics and transportation management program, further optimizing our engineering cost structure, capturing benefits of our Water One remote system monitoring and data analytics offerings. We refer to these initiatives as “Value Creators” as these improvements focus on creating value for customers through reduced leadtimes, improved quality and superior customer support, while also creating value for stockholders through enhanced earnings growth. Furthermore, as a result of significant investments we have made in our footprint and facilities, we have capacity to support our planned growth without commensurate increase in fixed costs.

Acquisitions and Divestitures

See Note 3. Acquisitions and Divestitures and Note 21. Subsequent Events to the Unaudited Condensed Consolidated Financial Statements in Item 1 of this Report for a complete discussion of recent acquisitions.

Key Factors and Trends Affecting Our Business and Financial Statements

Various trends and other factors affect or have affected our operating results, including:

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Overall economic trends. The overall economic environment and related changes in industrial, commercial and municipal spending impact our business. In general, positive conditions in the broader economy promote industrial, commercial and municipal customer spending, while economic weakness results in a reduction of new industrial, commercial and municipal project activity. Macroeconomic factors that can affect customer spending patterns, and thereby our results of operations, include population growth, total water consumption, municipal budgets, employment rates, business conditions, the availability of credit or capital, interest rates, tax rates and regulatory changes. Since the businesses of our customers vary in cyclicality, periodic downturns in any specific sector typically have modest impacts on our overall business.

New products and technologies. Our ability to maintain our appeal to existing customers and attract new customers depends on our ability to originate, develop and offer a compelling array of products, services and solutions responsive to evolving customer innovations, preferences and specifications. We expect that increased use of water in industrial and commercial processes will drive increased customer demand in the future, and our ability to grow will depend in part on effectively responding to innovation in our customers’ processes and systems. Further, our ability to provide products that comply with evolving government regulations will also be a driver of the appeal of our products, services and solutions to industrial and commercial customers.

Changes in costs and availability. We have significant exposures to certain commodities, including steel, caustic, carbon, calcium nitrate and iridium, and volatility in the market price and availability of these commodity input materials has a direct impact on our costs and our business. For example, the U.S. government has recently proposed imposing greater restrictions on international trade, including tariffs and/or other trade restraints on certain steel and aluminum imports. These restrictions, particularly those related to China, could increase the cost of our products and restrict availability of certain commodities, which may result in delays in our execution of projects. There can be no assurance that we will be able to recuperate these higher costs from our customers through product price increases. If we are unable to manage commodity fluctuations through pricing actions, cost savings projects and sourcing decisions as well as through consistent productivity improvements, it may adversely impact our gross profit and gross margin. Further, additional potential acquisitions and international expansion will place increased demands on our operational, managerial, administrative and other resources. Managing our growth effectively will require us to continue to enhance our management systems, financial and management controls and information systems. We will also be required to hire, train and retain operational and sales personnel, which affects our operating margins.

Government policies. Decaying water systems in the United States will require critical drinking water and wastewater repairs, often led by municipal governments. Further, as U.S. states increase regulation on existing and emerging contaminants, we expect that our customers will increasingly require sustainable solutions to their water‑related needs. In general, increased infrastructure investment and more stringent municipal, state and federal regulations promote increased spending on our products, services and solutions, while a slowdown in investment in public infrastructure or the elimination of key environmental regulations could result in lower industrial and municipal spending on water systems and products.

Availability of water. In general, we expect demand for our products and services to increase as the availability of clean water from public sources decreases. Secular trends that will drive demand for water across a multitude of industrial, commercial and municipal applications include global population growth, urbanization, industrialization and overall economic growth. In addition, the supply of clean water could be adversely impacted by factors including an aging water infrastructure within North America and increased levels of water stress from seasonal rainfall, inadequate water storage options or treatment technologies. Because water is a critical component and byproduct of many processes, including in manufacturing and product development, we expect that, as global consumption patterns evolve and water shortages persist, demand for our equipment and services will continue to increase.

Operational investment. Our historical operating results reflect the impact of our ongoing investments to support our growth. We have made significant investments in our business that we believe have laid the foundation for continued profitable growth. We believe that our strengthened sales force, mergers and acquisitions team, enhanced information systems, research, development and engineering investments and other factors enable us to support our operating model.

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Our ability to source and distribute products effectively. Our revenues are affected by our ability to purchase our inputs in sufficient quantities at competitive prices. While we believe our suppliers have adequate capacity to meet our current and anticipated demand, our level of revenues could be adversely affected in the event of constraints in our supply chain, including the inability of our suppliers to produce sufficient quantities of raw materials in a manner that is able to match demand from our customers.

Fluctuation in quarterly results. Our quarterly results have historically varied depending upon a variety of factors, including funding, readiness of projects and regulatory approvals. In addition, our contracts for large capital water treatment projects, systems and solutions for industrial, commercial and municipal applications are generally fixed‑price contracts with milestone billings. As a result of these factors, our working capital requirements and demands on our distribution and delivery network may fluctuate during the year.

Contractual relationships with customers. Due to our large installed base and the nature of our contractual relationships with our customers, we have high visibility into a large portion of our revenue. The one‑ to twenty‑year terms of many of our service contracts and the regular delivery and replacement of many of our products help to insulate us from the negative impact of any economic decline.

Inflation and deflation trends. Our financial results can be expected to be directly impacted by substantial increases in costs due to commodity cost increases or general inflation which could lead to a reduction in our revenues as well as greater margin pressure as increased costs may not be able to be passed on to customers. To date, changes in commodity prices and general inflation have not materially impacted our business.

Exchange rates. The reporting currency for our financial statements is the U.S. dollar. We operate in numerous countries around the world and therefore, certain of our assets, liabilities, revenues and expenses are denominated in functional currencies other than the U.S. dollar, primarily in the euro, U.K. sterling, Chinese renminbi, Canadian dollar, Australian dollar and Singapore dollar. To prepare our consolidated financial statements we must translate those assets, liabilities, revenues and expenses into U.S. dollars at the applicable exchange rate. As a result, increases or decreases in the value of the U.S. dollar against these other currencies will affect the amount of these items recorded in our consolidated financial statements, even if their value has not changed in the functional currency. While we believe we are not susceptible to any material impact on our results of operations caused by fluctuations in exchange rates because our operations are primarily conducted in the United States, if we expand our foreign operations in the future, substantial increases or decreases in the value of the U.S. dollar relative to these other currencies could have a significant impact on our results of operations.

Public company costs. As a result of our IPO, we now incur additional legal, accounting and other expenses that we did not previously incur, including costs associated with SEC reporting and corporate governance requirements. These requirements include compliance with the Sarbanes‑Oxley Act as well as other rules implemented by the SEC and the NYSE. Our financial statements following our IPO will reflect the impact of these expenses. In addition, the one‑time grant of stock‑settled restricted stock unit awards made in connection with the IPO to certain members of management will result in increased non‑cash stock‑based compensation expense, which will be incremental to our ongoing stock‑based compensation expense. This stock‑based compensation expense is expected to be expensed beginning in the first fiscal quarter of fiscal 2018 and continuing over the following eight fiscal quarters.

Debt refinancings. On December 20, 2017, certain subsidiaries of the Company entered into Amendment No. 5 (the “Fifth Amendment”), among EWT III, as the borrower, certain other subsidiaries of the Company, and Credit Suisse AG, as administrative agent and collateral agent, relating to the First Lien Credit Agreement, dated January 15, 2014 (as amended, amended and restated, extended, supplemented or otherwise modified from time to time prior to the effectiveness of the Amendment, the “Existing Credit Agreement”). Proceeds of the Fifth Amendment were used to refinance $796,574 of Existing Term Loans.  Principal and interest under the Term Loans outstanding under the First Lien Credit Agreement are payable in quarterly installments, with quarterly principal reductions under the Fifth Amendment of $1,991, and the balance due at maturity on December 20, 2024.

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How We Assess the Performance of Our Business

In assessing the performance of our business, we consider a variety of performance and financial measures. The key indicators of the financial condition and operating performance of our business are revenue, gross profit, gross margin, operating expenses, net income (loss) and Adjusted EBITDA.

Revenue

Our sales are a function of sales volumes and selling prices, each of which is a function of the mix of product and service sales, and consist primarily of:

• sales of tailored light industry technologies, heavy industry technologies and environmental products, services and solutions in collaboration with our industrial customers, backed by lifecycle services including emergency response services and build‑own‑operate alternatives, to a broad group of industrial customers in our U.S., Canada and Singapore markets;

• sales of products, services and solutions to engineering firms and municipalities to purify drinking water and treat wastewater globally; and

• sales of a wide variety of differentiated products and technologies, to an array of OEM, distributor, end‑user, engineering firm and integrator customers in all of our geographic markets and aftermarket channels.

Cost of Sales, Gross Profit and Gross Margin

Gross profit is determined by subtracting cost of product sales and cost of services from our product and services revenue. Gross margin measures gross profit as a percentage of our combined product and services revenue.

Cost of product sales consists of all manufacturing costs required to bring a product to a ready for sale condition, including direct and indirect materials, direct and indirect labor costs including benefits, freight, depreciation, information technology, rental and insurance, repair and maintenance, utilities, other manufacturing costs, warranties and third party commissions.

Cost of services primarily consists of the cost of personnel and travel for our field service, supply chain and technicians, depreciation of equipment and field service vehicles and freight costs.

Operating Expenses

Operating expenses consist primarily of sales and marketing, general and administrative and research and development expenses.

Sales and Marketing. Sales and marketing expenses consist primarily of advertising and marketing promotions of our products, services and solutions and related personnel expenses (including all Evoqua sales and application employees’ base compensation and incentives), as well as sponsorship costs, consulting and contractor expenses, travel, display expenses and related amortization. We expect our sales and marketing expenses to increase as we continue to actively promote our products, services and solutions.

General and Administrative. General and administrative expenses consist of fixed overhead personnel expenses associated with our service organization (including district and branch managers, customer service, contract renewals and regeneration plant management). We expect our general and administrative expenses to increase due to the anticipated growth of our business and related infrastructure as well as legal, accounting, insurance, investor relations and other costs associated with becoming a public company.

Research and Development. Research and development expenses consist primarily of personnel expenses related to research and development, patents, sustaining engineering, consulting and contractor expenses, tooling and prototype materials and overhead costs allocated to such expenses. Substantially all of our research and development expenses are related to developing new products and services and improving our existing products and services. To date, research and development expenses have been expensed as incurred, because the period between achieving

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technological feasibility and the release of products and services for sale has been short and development costs qualifying for capitalization have been insignificant.

We expect our research and development expenses to increase as we continue to invest in developing new products, services and solutions and enhancing our existing products, services and solutions.

Net Income (Loss)

Net income (loss) is determined by subtracting operating expenses and interest expense from, and adding other operating income (expense), equity income from our partnership interest in Treated Water Outsourcing and income tax benefit (expense) to, gross profit. For more information on how we determine gross profit, see “-Gross Profit.”

Adjusted EBITDA

Adjusted EBITDA is one of the primary metrics used by management to evaluate the financial performance of our business. Adjusted EBITDA is defined as net income (loss) before interest expense, income tax benefit (expense) and depreciation and amortization, adjusted for the impact of certain other items, including restructuring and related business transformation costs, purchase accounting adjustment costs, non-cash stock-based compensation, sponsor fees, transaction costs and other gains, losses and expenses. We present Adjusted EBITDA, which is not a recognized financial measure under GAAP, because we believe it is frequently used by analysts, investors and other interested parties to evaluate companies in our industry. Further, we believe it is helpful in highlighting trends in our operating results, because it excludes the results of decisions that are outside the control of management, while other measures can differ significantly depending on long‑term strategic decisions regarding capital structure, the tax jurisdictions in which we operate and capital investments. Management uses Adjusted EBITDA to supplement GAAP measures of performance as follows:

• to assist investors and analysts in comparing our operating performance across reporting periods on a consistent basis by excluding items that we do not believe are indicative of our core operating performance;

• in our management incentive compensation which is based in part on components of Adjusted EBITDA;

• in certain calculations under our senior secured credit facilities, which use components of Adjusted EBITDA.

• to evaluate the effectiveness of our business strategies;

• to make budgeting decisions; and

• to compare our performance against that of other peer companies using similar measures.

In addition to the above, our chief operating decision maker uses EBITDA of each reportable segment to evaluate the operating performance of such segments. EBITDA of the reportable segments does not include certain unallocated charges that are presented within Corporate activities. These unallocated charges include certain restructuring and other business transformation charges that have been incurred to align and reposition the Company to the current reporting structure, acquisition related costs (including transaction costs, integration costs and recognition of backlog intangible assets recorded in purchase accounting) and stock-based compensation charges.

You are encouraged to evaluate each adjustment and the reasons we consider it appropriate for supplemental analysis. In addition, in evaluating Adjusted EBITDA, you should be aware that in the future, we may incur expenses similar to the adjustments in the presentation of Adjusted EBITDA. Our presentation of Adjusted EBITDA should not be construed as an inference that our future results will be unaffected by unusual or non‑recurring items. In addition, Adjusted EBITDA may not be comparable to similarly titled measures used by other companies in our industry or across different industries.

The following is a reconciliation of our net income (loss) to Adjusted EBITDA (unaudited, amounts in thousands):

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	Three Months Ended March 31,						Six Months Ended March 31,
	2017			2018			2017			2018
Net income (loss)	$	4,895		$	12,980		$	(8,305	)	$	9,975
Interest expense	11,898			10,810			26,651			28,053
Income tax (benefit) expense	(4,812		)	2,018			(11,907)			(2,393)
Depreciation and amortization	18,873			20,480			37,520			40,363
EBITDA	30,854			46,288			43,959			75,998
Restructuring and related business transformation costs (a)	9,875			8,228			23,033			16,343
Purchase accounting adjustment costs (b)	10			—			229			—
Share-based compensation (c)	554			4,250			1,020			6,862
Sponsor fees (d)	1,000			—			2,000			333
Transaction costs (e)	2,400			846			3,759			1,360
Other gains, losses and expenses (f)	(764		)	(1,912		)	7,171			(3,215		)
Adjusted EBITDA	$	43,929		$	57,700		$	81,171		$	97,681

(a) Represents:

(i) costs and expenses in connection with various restructuring initiatives since our acquisition, through our wholly-owned entities, EWT Holdings II Corp. and EWT Holdings III Corp., of all of the outstanding shares of Siemens Water Technologies, a group of legal entity businesses formerly owned by Siemens Aktiengesellschaft, on January 15, 2014 (the “AEA Acquisition”), including severance costs, relocation costs, recruiting expenses, write‑offs of inventory and fixed assets and third‑party consultant costs to assist with these initiatives (includes (A) $5.7 million and $15.9 million for the three and six months ended March 31, 2017, respectively, and $0.0 million and $0.3 million for the three months and six months ended March 31, 2018, respectively, (all of which is reflected as a component of Restructuring charges in “Note 11-Restructuring and Related Charges” to our unaudited condensed consolidated financial statements included in this Report) related to our voluntary separation plan pursuant to which approximately 220 employees accepted separation packages, and (B) $1.5 million and $2.7 million for the three and six months ended March 31, 2017, respectively, reflected as a components of Cost of product sales and services ($0.9 million and $1.7 million for the three and six month periods, respectively), and General and administrative expense ($0.6 million and $1.0 million for the three and six month periods, respectively); and $1.9 million and $5.4 million for the three and six month periods ended March 31, 2018, respectively, reflected as components of Cost of product sales and services ($0.3 million and $1.6 million for the three and six month periods, respectively), Research and development expense ($0.2 million and $0.5 million for the three and six month periods, respectively), Sales and marketing expense ($0.2 million and $0.5 million for the three and six month periods, respectively) and General and administrative expense ($1.2 million and $2.8 million for the three and six month periods, respectively) (all of which is reflected as a component of Restructuring charges in “Note 11-Restructuring and Related Charges” to our unaudited condensed consolidated financial statements included in this Report) related to various other initiatives implemented to restructure and reorganize our business with the appropriate management team and cost structure);

(ii) legal settlement costs and intellectual property related fees associated with legacy matters prior to the AEA Acquisition, including fees and settlement costs related to product warranty litigation on MEMCOR products and certain discontinued products ($0.3 million and $0.8 million for the three and six months ended March 31, 2017, respectively, reflected as components of Cost of product sales

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and services ($0.1 million and $0.2 million for the three and six month periods, respectively) and General and administrative expense ($0.2 million and $0.6 million for the three and six month periods, respectively), and $0.9 million and $1.0 million for the three and six months ended March 31, 2018, reflected as components of Cost of product sales and services ($0.3 million and $0.4 million for the three and six month periods, respectively) and General and administrative expense ($0.6 million and $0.6 million for the three and six month periods, respectively));

(iii) expenses associated with our information technology and functional infrastructure transformation following the AEA Acquisition, including activities to optimize information technology systems and functional infrastructure processes ($2.3 million and $3.7 million for the three and six months ended March 31, 2017, primarily reflected as components of Cost of product sales and services ($1.2 million and $1.7 million for the three and six month periods, respectively), Sales and marketing expense ($0.2 million and $0.5 million for the three and six month periods, respectively) and General and administrative expense ($0.9 million and $1.5 million for the three and six month periods, respectively), and $3.4 million and $4.7 million in the three and six months ended March 31, 2018, primarily reflected as components of Cost of product sales and services ($1.2 million and $2.2 million for the three and six month periods, respectively), Sales and marketing expense ($0.1 million for the three and six months periods, respectively) and General and administrative expense ($2.1 million and $2.4 million for the three and six month periods, respectively)); and

(iv) costs incurred by us in connection with our IPO and secondary offering, including consultant costs and public company compliance costs ($2.0 million and $5.0 million for the three and six months ended March 31, 2018, respectively, all reflected as a component of General and administrative expense).

(b) Represents adjustments for the effect of the purchase accounting step-up in the value of inventory to fair value recognized in cost of goods sold as a result of the acquisition of Magneto.

(c) Represents non‑cash stock‑based compensation expenses related to option awards. See “Note 14-Share-Based Compensation” to our unaudited condensed consolidated financial statements included in this Report for further detail.

(d) Represents management fees paid to AEA pursuant to the management agreement. Pursuant to the management agreement, AEA provided advisory and consulting services to us in connection with the AEA Acquisition, including investment banking, due diligence, financial advisory and valuation services. AEA also provided ongoing advisory and consulting services to us pursuant to the management agreement. In connection with the IPO, the management agreement was terminated. See “Note 16-Related-Party Transactions” to our unaudited condensed consolidated financial statements included in this Report for further detail.

(e) Represents expenses associated with acquisition and divestiture related activities and post‑acquisition integration costs and accounting, tax, consulting, legal and other fees and expenses associated with acquisition transactions ($2.4 million and $3.8 million in the three and six months ended March 31, 2017, respectively, and $0.8 million and $1.4 million in the three and six months ended March 31, 2018, respectively).

(f) Represents:

(i) impact of foreign exchange gains and losses ($2.5 million gain and $5.2 million loss in the three and six months ended March 31, 2017, respectively, and $2.1 million gain and $3.7 million gain in the three and six months ended March 31, 2018, respectively);

(ii) foreign exchange impact related to headquarter allocations ($0.9 million loss and $1.1 million loss for the three and six months ended March 31, 2017, respectively, and $0.2 million gain for the three and six months ended March 31, 2018, respectively); and

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(iii) expenses related to maintaining non-operational business locations ($0.6 million and $0.7 million in the three and six months ended March 31, 2017, respectively, and $0.5 million $0.7 million in the three and six months ended March 31, 2018, respectively).

Results of Operations

The following tables summarize key components of our results of operations for the periods indicated:

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	Three Months Ended March 31,										Six Months Ended March 31,
	2017				2018						2017					2018
			% of Revenues				% of Revenues		% Variance					% of Revenues				% of Revenues		% Variance
	(in thousands)										(in thousands)
Revenue from product sales and services	$	299,901	100.0%		$	333,690	100.0	%	—	%	$	579,773		100.0	%	$	630,740	100.0	%	—	%
Cost of product sales and services	(205,568)		(68.5	)%	(225,693)		(67.6	)%	(1.3	)%	(403,372)			(69.6	)%	(434,364)		(68.9	)%	(1.0	)%
Gross profit	94,333		31.5	%	107,997		32.4	%	2.9	%	176,401			30.4	%	196,376		31.1	%	2.3	%
General and administrative expense	(40,211)		(13.4	)%	(44,742)		(13.4	)%	—	%	(89,397)			(15.4	)%	(83,807)		(13.3	)%	(13.6	)%
Sales and marketing expense	(36,690)		(12.2	)%	(34,330)		(10.3	)%	(15.6	)%	(71,783)			(12.4	)%	(68,571)		(10.9	)%	(12.1	)%
Research and development expense	(5,086)		(1.7	)%	(4,021)		(1.2	)%	(29.4	)%	(10,091)			(1.7	)%	(8,674)		(1.4	)%	(17.6	)%
Other operating (expense) income	(365)		(0.1	)%	904		0.3	%	(400.0	)%	1,309			0.2	%	311		—	%	(100.0	)%
Interest expense	(11,898)		(4.0	)%	(10,810)		(3.2	)%	(20.0	)%	(26,651)			(4.6	)%	(28,053)		(4.4	)%	(4.3	)%
Loss before income taxes	83		—	%	14,998		4.5	%			(20,212)			(3.5	)%	7,582		1.2	%
Income tax benefit (expense)	4,812		1.6	%	(2,018)		(0.6	)%	(137.5	)%	11,907			2.1	%	2,393		0.4	%	(81.0	)%
Net income (loss)	4,895		1.6	%	12,980		3.9	%	143.8	%	(8,305)			(1.4	)%	9,975		1.6	%	(214.3	)%
Net income attributable to non‑controlling interest	1,697		0.6	%	477		0.1	%	(83.3	)%	2,096			0.4	%	1,185		0.2	%	(50.0	)%
Net income (loss) attributable to Evoqua Water Technologies Corp.	$	3,198	1.1	%	$	12,503	3.7	%	236.4	%	$	(10,401	)	(1.8	)%	$	8,790	1.4	%	(177.8	)%
Weighted average shares outstanding
Basic	104,632				113,770						104,632					113,770
Diluted	107,741				119,215						104,632					119,543
Earnings (loss) per share
Basic	$	0.03			$	0.11					$	(0.10	)			$	0.08
Diluted	$	0.03			$	0.10					$	(0.10	)			$	0.07
Other financial data:
Adjusted EBITDA(1)	$	43,929	14.6	%	$	57,700	17.3	%	18.5	%	$	81,171		14.0	%	$	97,681	15.5	%	10.7	%

(1) For the definition of Adjusted EBITDA and a reconciliation to net income (loss), its most directly comparable financial measure presented in accordance with GAAP, see “How We Assess the Performance of Our Business-Adjusted EBITDA.”

47

Consolidated Results

Revenues-Revenues increased $33,789, or 11.3%, to $333,690 in the three months ended March 31, 2018 from $299,901 in the three months ended March 31, 2017. Revenues increased $50,967, or 8.8%, to $630,740 in the six months endedMarch 31, 2018 from $579,773 in the six months endedMarch 31, 2017.

The following table provides the change in revenues from product sales and revenues from services, respectively:

	Three Months Ended March 31,							Six Months Ended March 31,
	2017			2018			% Variance	2017			2018			% Variance
			% of Revenues			% of Revenues				% of Revenues			% of Revenues
	(in thousands)							(in thousands)
Revenue from product sales	$	159,942	53.3%	$	191,701	57.4%	19.9%	$	306,291	46.7%	$	349,724	42.6%	14.2%
Revenue from services	139,959		46.7%	141,989		42.6%	1.5%	273,482		53.3%	281,016		57.4%	2.8%
	$	299,901		$	333,690		11.3%	$	579,773		$	630,740		8.8%

Revenues from product sales increased $31,759, or 19.9%, to $191,701 in the three months ended March 31, 2018 from $159,942 in the three months ended March 31, 2017. The increase in product revenues was primarily due to the growth in capital projects of $14,393 year-over-year in addition to revenue from the acquisitions of Noble, ADI, Olson, Pure Water and Pacific Ozone, which accounted for $10,238 of increased revenues. Aftermarket and other component product sales also had organic revenue growth of $3,319. The remaining increase of $3,809 was due to gains from foreign currency translation.

Revenues from product sales increased $43,433, or 14.2%, to $349,724 in the six months endedMarch 31, 2018 from $306,291 in the six months endedMarch 31, 2017. The increase in product revenues was primarily due to the acquisitions of Noble, ADI, Olson, Pure Water and Pacific Ozone, which accounted for $19,121 of the growth in revenues year-over-year. Growth in capital projects resulted in an increase of $11,577 and aftermarket and other component product sales had organic growth of $6,888. The remaining increase of $5,847 was due to gains from foreign currency translation.

Revenues from services increased $2,030, or 1.5%, to $141,989 in the three months ended March 31, 2018 from $139,959 in the three months ended March 31, 2017. The main driver of this increase was the timing of the delivery of services as compared to the prior year. The remaining increase was due to $486 recognized from the Noble and Pure Water acquisitions.

Revenues from services increased $7,534, or 2.8%, to $281,016 in the six months endedMarch 31, 2018 from $273,482 in the six months endedMarch 31, 2017. The increase was driven mainly by organic revenue growth, including volume driven increases in Industrial service revenue of approximately $6,378 associated with account penetration in the power, hydrocarbon processing and chemical processing markets. Another $922 was recognized from the Noble and Pure Water acquisitions. The remaining $234 was the result of timing of delivery of services in the current period as compared to the prior period.

Cost of Sales and Gross Margin-Total gross margin increased to 32.4% in the three months ended March 31, 2018 from 31.5% in the three months ended March 31, 2017. Total gross margin increased slightly to 31.1% in the six months ended March 31, 2018 from 30.4% in the six months ended March 31, 2017.

The following table provides the change in cost of product sales and cost of services, respectively, along with related gross margins:

48

	Three Months Ended March 31,						Six Months Ended March 31,
	2017			2018			2017			2018
			Gross Margin %			Gross Margin %			Gross Margin %			Gross Margin %
	(in thousands)						(in thousands)
Cost of product sales	$	105,015	34.3%	$	123,240	35.7%	$	207,463	32.3%	$	228,305	34.7%
Cost of services	100,553		28.2%	102,453		27.8%	195,909		28.4%	206,059		26.7%
	205,568		31.5%	$	225,693	32.4%	$	403,372	30.4%	$	434,364	31.1%

Cost of product sales increased by approximately $18,225 in the three months ended March 31, 2018 from $105,015 in the three months ended March 31, 2017. The increase in cost of product sales was primarily driven by the volume increases year-over-year related to organic capital project and aftermarket revenues, which accounted for $14,044 of the increase, as well as due to the acquisitions of Noble, ADI, Olson, Pure Water and Pacific Ozone, which accounted for $5,841 of the increase. These increases were offset by a reduction in warranty expense of $1,660.

Cost of product sales increased $20,842 to $228,305, in the six months endedMarch 31, 2018 from $207,463 in the six months endedMarch 31, 2017. The increase in cost of product sales was primarily driven by the increased volume in capital projects and aftermarket revenues, which accounted for $10,248 of the increase, as well as the acquisitions of ADI, Olson, Pure Water and Pacific Ozone, which accounted for $10,594 of the increase year-over-year.

Cost of services increased by approximately $1,900 in the three months ended March 31, 2018 from $100,553 in the three months ended March 31, 2017. The increase in cost of services was mainly related to an overall increase in revenue volume.

Cost of services increased by $10,150 to $206,059 in the six months endedMarch 31, 2018 from $195,909 in the six months endedMarch 31, 2017. The increase in cost of services was mainly related to an overall increase in revenue volume.

Operating Expenses-Operating expenses increased $1,106, or (1.3)%, to $83,093 in the three months ended March 31, 2018 from $81,987 in the three months ended March 31, 2017. The increase in operating expenses was primarily due increased expenses of $2,843 due to the acquisitions of Noble, ADI, Olson, Pure Water and Pacific Ozone in addition to the costs incurred related to the secondary offering of $1,577. These increases were offset by a $2,826 reduction in restructuring expenses and employment costs driven by the cost improvement initiatives implemented in the current and prior year and reduction in research and development spending of $488.

Operating expenses decreased $10,219, or 6.0%, to $161,052 in the six months endedMarch 31, 2018 from $171,271 in the six months endedMarch 31, 2017. The decrease in operating expense was primarily due to a $6,237 reduction in restructuring expenses and employment costs driven by the cost improvement initiatives implemented in the current and prior year in addition to unfavorable translation adjustments of $8,897 incurred in the prior year. These improvements in operating expenses were offset by increased expenses of $4,915 due to the acquisitions of Noble, ADI, Olson, Pure Water and Pacific Ozone. A discussion of operating expenses by category is as follows:

Research and Development Expense - Research and development expenses decreased due to reduced spending and an increase of cost reimbursements received from outside parties over the same periods in the prior year.

Sales and Marketing Expense - Sales and marketing expenses had a decrease mainly due to a reduction in restructuring charges and lower employment costs.

General and Administrative Expense - General and administrative expenses increased $4,531, or 11.0%, to $44,742 in the three months ended March 31, 2018 from $40,211 in the three months ended March 31, 2017. This increase in general and administrative expenses was primarily due to $2,843 related to the Noble, ADI, Olson, Pure Water and Pacific Ozone acquisitions in addition to costs incurred of $1,577 related to the secondary offering. Additionally, there were higher depreciation and amortization costs driven by capital investments.

General and administrative expenses decreased $5,714 , or 6.4%, to $83,807 in the six months endedMarch 31, 2018 from $89,397 in the six months endedMarch 31, 2017. This decrease in general and administrative expenses was primarily due to favorable foreign currency impacts on the intracompany loans of $8,897 as well as $1,761 lower employment costs driven by the restructuring and cost improvement initiatives implemented in the current and prior year. These reductions were offset by increases due to acquisitions of $4,298 and higher depreciation and amortization costs driven by capital investments.

49

Other Operating Income (Expense), Net-Other operating income increased $1,269, or 347.7%, to income of $904 in the three months ended March 31, 2018 from expense of $365 in the three months ended March 31, 2017. In the three months ended March 31, 2018, the Company had a gain from the sale of precious metals that resulted in approximately $500, in addition to an insurance settlement of $100. There were no similar transactions in the three months ended March 31, 2017.

Other operating income decreased $998, or 76.2%, to expense of $311 in the six months endedMarch 31, 2018 from income of $1,309 in the six months endedMarch 31, 2017. In addition to the changes mentioned for the three months ended, during the six months endedMarch 31, 2017, the Company had a gain on sale of equipment of $446. The six months endedMarch 31, 2018 had a loss on sale of equipment of $102.

Interest Expense-Interest expense decreased $1,088, or 9.1%, to $10,810 in the three months ended March 31, 2018 from $11,898 in the three months ended March 31, 2017. The decrease in interest expense was primarily due the reduction in the overall loan balance due to a $100,000 prepayment during the first quarter of the current fiscal year, coupled with the refinancing that occurred in December 2017. Interest expense increased $1,402, or 5.3%, to $28,053 in the six months endedMarch 31, 2018 from $26,651 in the six months endedMarch 31, 2017. The increase in interest expense was primarily due to the increase in charges associated with the $100,000 prepayment of the Term Loan in November 2017 coupled with the refinancing that occurred in December 2017.

Income Tax Benefit-An Income tax benefit (expense) of $4,812 and $(2,018) was recorded for the three months ended March 31, 2017 and 2018, respectively. The increase in tax expense is principally the result of significantly stronger earnings compared to the same quarter in the prior year. In each period, discrete items were not material, and there were no material changes to amounts reported in the first quarter as a result of the Tax Act.

An income tax benefit of $11,907 and $2,393 was recorded for the six months ended ended March 31, 2017 and 2018, respectively. This decrease is partially offset by a discrete tax benefit of $3,641 to remeasure U.S. deferred tax liabilities associated with indefinite lived intangible assets from 35.0% to 21.0%. Other than accounting for the reduced U.S. federal tax rate to 21.0%, there are currently no other U. S. tax reform effects reflected in operating results as either such amounts are not expected to be material, or certain other applicable provisions are not effective for fiscal year tax filers until October 1, 2018.

Net Income-Net income increased by $8,085, or 165.2%, to $12,980 for the three months ended March 31, 2018 from $4,895 in the three months ended March 31, 2017. This increase was primarily driven by increased sales and gross profit, offset by an increase in operating expenses, as described above. Net income increased by $18,280, or 220.1%, to net earnings of $9,975 for the six months endedMarch 31, 2018 from a net loss of $(8,305) in the six months endedMarch 31, 2017. This increase was primarily driven by increased sales and gross profit, as well as by a reduction in operating expenses, as described above.

Adjusted EBITDA-Adjusted EBITDA increased $13,771, or 31.3%, to $57,700 for the three months ended March 31, 2018 from $43,929 for the three months ended March 31, 2017. Adjusted EBITDA increased $16,510, or 20.3%, to $97,681 for the six months endedMarch 31, 2018 from $81,171 for the six months endedMarch 31, 2017. Benefits derived from restructuring and operational efficiencies that were implemented in the current and prior fiscal year, as well as increased volume and accretive profitability associated with organic revenue growth and current and prior year acquisitions, provided for the increase in Adjusted EBITDA.

50

Segment Results

	Three Months Ended March 31,								Six Months Ended March 31,
	2017			2018			% Variance		2017			2018			% Variance
	(in thousands)								(in thousands)
Revenues
Industrial	$	160,457		$	181,259		13.0	%	$	306,163		$	346,453		13.2	%
Municipal	63,554			64,284			1.1	%	126,185			126,190			—	%
Products	75,890			88,147			16.2	%	147,425			158,097			7.2	%
Total Consolidated	$	299,901		$	333,690		11.3	%	$	579,773		$	630,740		8.8	%
Percentage of total consolidated revenues
Industrial	53.5		%	54.3		%			52.8		%	54.9		%
Municipal	21.2		%	19.3		%			21.8		%	20.0		%
Products	25.3		%	26.4		%			25.4		%	25.1		%
Total Consolidated	100		%	100		%			100		%	100		%
Operating Profit
Industrial	$	25,845		$	31,004		20.0	%	$	48,934		$	60,986		24.6	%
Municipal	6,476			7,981			23.2	%	12,963			12,773			(1.5	)%
Products	13,851			19,885			43.6	%	25,216			27,570			9.3	%
Corporate	(34,191		)	(33,062		)	3.3	%	(80,674		)	(65,694		)	18.6	%
Total Consolidated	$	11,981		$	25,808		115.4	%	$	6,439		$	35,635		453.4	%
Operating profit as a percentage of total consolidated revenues
Industrial	8.6		%	9.3		%			16.3		%	18.3		%
Municipal	2.2		%	2.4		%			4.3		%	3.8		%
Products	4.6		%	6.0		%			8.4		%	8.3		%
Corporate	(11.4		)%	(9.9		)%			(26.9		)%	(19.7		)%
Total Consolidated	3.6		%	7.7		%			1.9		%	10.7		%
EBITDA
Industrial	$	35,373		$	41,713		17.9	%	$	67,374		$	81,840		21.5	%
Municipal	8,526			9,758			14.4	%	17,088			16,350			(4.3	)%
Products	16,956			22,972			35.5	%	31,855			33,646			5.6	%
Corporate and unallocated costs	(30,001		)	(28,155		)	(6.2	)%	(72,358		)	(55,838		)	(22.8	)%
Total Consolidated	$	30,854		$	46,288		50.0	%	$	43,959		$	75,998		72.9	%
EBITDA as a percentage of total consolidated revenues
Industrial	11.8		%	12.5		%			22.5		%	24.5		%
Municipal	2.8		%	2.9		%			5.7		%	4.9		%
Products	5.7		%	6.9		%			10.6		%	10.1		%
Corporate and unallocated costs	(10.0		)%	(8.4		)%			(24.1		)%	(16.7		)%
Total Consolidated	9.2		%	13.9		%			13.2		%	22.8		%

EBITDA on a segment basis is defined as earnings before interest, taxes, depreciation and amortization. The following is a reconciliation of our segment operating profit to EBITDA on a segment basis:

51

	Three Months Ended March 31,
	2017									2018
	Industrial			Municipal			Products			Industrial			Municipal			Products
	(in thousands)
Operating Profit	$	25,845		$	6,476		$	13,851		$	31,004		$	7,981		$	19,885
Interest expense(1)	—			—			—			—			—			—
Income tax expense (benefit)(1)	—			—			—			—			—			—
Depreciation and amortization	(9,528		)	(2,050		)	(3,105		)	(10,709		)	(1,777		)	(3,087		)
EBITDA	$	35,373		$	8,526		$	16,956		$	41,713		$	9,758		$	22,972
	Six Months Ended March 31,
	2017									2018
	Industrial			Municipal			Products			Industrial			Municipal			Products
	(in thousands)
Operating Profit	$	48,934		$	12,963		$	25,216		$	60,986		$	12,773		$	27,570
Interest expense(1)	—			—			—			—			—			—
Income tax expense (benefit)(1)	—			—			—			—			—			—
Depreciation and amortization	(18,440		)	(4,125		)	(6,639		)	(20,854		)	(3,577		)	(6,076		)
EBITDA	$	67,374		$	17,088		$	31,855		$	81,840		$	16,350		$	33,646

(1) Interest expense and Income tax expense (benefit) are corporate activities that are not allocated to our three reportable segments.

Industrial

Revenues in the Industrial Segment increased $20,802, or 13.0%, to $181,259 in the three months ended March 31, 2018 from $160,457 in the three months ended March 31, 2017. The increase in revenue was driven by further capital penetration primarily in the power market and remediation projects of $10,720. Service revenue increased $635 primarily in the power, hydrocarbon processing and chemical processing. In addition, an increase of $9,447 of revenue was attributable to our acquisitions of ADI, Noble and Pure Water.

Revenues in the Industrial Segment increased $40,290, or 13.2%, to $346,453 in the six months endedMarch 31, 2018 from $306,163 in the six months endedMarch 31, 2017. Further capital penetration, primarily in the power market and remediation projects, resulted in an increase of $14,334. Service revenue also increased $7,791 primarily in power, hydrocarbon processing and chemical processing. Another increase of $18,165 of revenue was attributable to our acquisitions of ADI, Noble and Pure Water.

Operating profit in the Industrial Segment increased $5,159, or 20.0%, to $31,004 in the three months ended March 31, 2018 from $25,845 in the three months ended March 31, 2017. The increase in operating profit was primarily related to $3,505 of benefits experienced as a result of lower employment costs driven by restructuring and cost improvement initiatives implemented in the current and prior fiscal year and an increase of $2,327 from the ADI, Noble and Pure Water acquisitions. Excluding the impact of acquisitions, Industrial Segment profitability driven by volume of $508 was tempered year-over-year by the product mix of revenue volume growth generated by capital projects as compared to revenues generated by higher margin services. Additionally, improvements in profitability were partially offset by $1,181 million related to higher depreciation and amortization driven by capital investment in service assets and the acquisitions mentioned above.

Operating profit in the Industrial Segment increased $12,052, or 24.6%, to $60,986 in the six months endedMarch 31, 2018 from $48,934 in the six months endedMarch 31, 2017. The increase in operating profit was primarily related to $5,331 of benefits experienced as a result of lower employment costs driven by restructuring and cost improvement initiatives implemented in the current and prior fiscal year. The ADI, Noble and Pure Water acquisitions contributed $5,092 of an increase to operating profit while $4,043 of increased operating profit was generated from the revenue growth mentioned above. These improvements were offset by higher depreciation and amortization of $2,414 driven by capital investment in service assets and the acquisitions mentioned above.

EBITDA in the Industrial Segment increased $6,340 and $14,466, in the three and six months endedMarch 31, 2017 and 2018, respectively. The increase in EBITDA resulted from the same factors which impacted operating profit, less the change in depreciation and amortization.

52

Municipal

Revenues in the Municipal Segment increased slightly by $730, or 1.1%, to $64,284 in the three months ended March 31, 2018 from $63,554 in the three months ended March 31, 2017. Large project revenues increased $2,884 due to MEMCOR growth coupled with a small amount of growth in service revenue of $202. The increase was partially offset by a decrease in aftermarket product sales of $1,739 as well as $617 of lower revenue from our Italian operations as this portion of our business approached final wind down.

Revenues in the Municipal Segment were essentially flat and increased $5, or 0.0%, to $126,190 in the six months endedMarch 31, 2018 from $126,185 in the six months endedMarch 31, 2017 for the same reasons noted as the quarterly increase in revenues. Large project and service revenues increased $3,268 and $1,251, respectively, which were offset by decreases in aftermarket product sales of $3,982 and a decline in revenues of $532 from our Italian operations as this portion of our business approached final wind down.

Operating profit in the Municipal Segment increased $1,505, or 23.2%, to $7,981 in the three months ended March 31, 2018 from $6,476 in the three months ended March 31, 2017. The increase in operating profit was due to $1,199 of lower costs primarily related to employment expenses through the continued alignment of a more customer focused organizational structure, and a reduction in warranty reserves of $1,660 due to improved product quality and better project execution. Additionally, depreciation expense declined by $250. Profitability improvements were partially offset by $1,604 related to the product mix of capital projects and service revenues as compared to higher margin aftermarket revenues.

Operating profit in the Municipal Segment decreased slightly by $190, or 1.5%, to $12,773 in the six months endedMarch 31, 2018 from $12,963 in the six months endedMarch 31, 2017. The decrease in operating profit was primarily due to changes in the product mix from higher margin aftermarket revenues to lower margin capital and services revenues for $3,704. This decline was offset by a reduction in warranty reserves of $1,565, lower depreciation expense of $502, and $1,447 associated with lower employment expenses and other operational efficiencies.

EBITDA in the Municipal Segment increased $1,232 and decreased $738, in the three and six months endedMarch 31, 2017 and 2018, respectively. EBITDA performance for both time periods were driven by the same factors which impacted operating profit in the Municipal Segment, less the change from depreciation and amortization.

Products

Revenues in the Products Segment increased $12,257, or 16.2%, to $88,147 in the three months ended March 31, 2018 from $75,890 in the three months ended March 31, 2017. Organic growth was $7,170 due to growth across the segment related to $1,924 of larger project revenues and $5,246 of increased aftermarket or component sales. Revenue growth from the acquisitions of Olson and Pacific Ozone was $1,277, and growth from foreign currency translations was $3,810.

Revenues in the Products Segment increased $10,672, or 7.2%, to $158,097 in the six months endedMarch 31, 2018 from $147,425 in the six months endedMarch 31, 2017. Organic growth was $2,948 due to increased volume across the segment including $10,433 of aftermarket or component revenues, offset by a decline of $7,485 in larger projects. Revenue growth from the acquisitions of Olson and Pacific Ozone was $1,877, and growth from foreign currency translation was $5,847.

Operating profit in the Products Segment increased $6,034 or 43.6%, to $19,885 in the three months ended March 31, 2018 from $13,851 in the three months ended March 31, 2017. The volume and mix of revenues along with operational efficiency accounted for an increase of $2,802. Additionally, $2,240 of the increase in operating profit was driven by lower employment costs driven by restructuring and cost improvement initiatives implemented in the current and prior fiscal year and $300 was due to lower depreciation and amortization. The increase from the acquisitions of Olson and Pacific Ozone was $160, and the increase from foreign currency translation was $532.

Operating profit in the Products Segment increased $2,354 or 9.3%, to $27,570 in the six months endedMarch 31, 2018 from $25,216 in the six months endedMarch 31, 2017. $3,994 of the increase in operating profit was was due to lower employment costs driven by restructuring and cost improvement initiatives implemented in the current and prior fiscal year and $1,087 was due to lower depreciation and amortization. The increase from the acquisitions of Olson and Pacific Ozone was $160, and the increase from foreign currency translations was $747. These improvements in operating profit were partially offset by the mix of revenue volume, which accounted for a decrease in operating profit of $3,634, primarily due to the timing of larger projects completed in the first quarter of the prior year.

53

EBITDA in the Products Segment increased $6,016 and $1,791 in the three and six months endedMarch 31, 2017 and 2018, respectively. EBITDA increased as a result of the same factors which impacted operating profit in the Products Segment, less the lower depreciation and amortization.

Liquidity and Capital Resources

Liquidity describes the ability of a company to generate sufficient cash flows to meet the cash requirements of its business operations, including working capital needs, debt service, acquisitions, other commitments and contractual obligations. We consider liquidity in terms of cash flows from operations and their sufficiency to fund our operating and investing activities.

Our principal sources of liquidity are our cash generated by operating activities and borrowings under our Revolving Credit Facility. Historically, we have financed our operations primarily from cash generated from operations and periodic borrowings under our $125,000 Revolving Credit Facility. Our primary cash needs are for day to day operations, to pay interest and principal on our indebtedness, to fund working capital requirements and to make capital expenditures.

We expect to continue to finance our liquidity requirements through internally generated funds and borrowings under our Revolving Credit Facility. We believe that our projected cash flows generated from operations, together with borrowings under our Revolving Credit Facility are sufficient to fund our principal debt payments, interest expense, our working capital needs and our expected capital expenditures for the next twelve months. Our capital expenditures for the six months ended March 31, 2017 and 2017 were $27,229 and $31,670, respectively. However, our budgeted capital expenditures can vary from period to period based on the nature of capital intensive project awards. We may draw on our Revolving Credit Facility from time to time to fund or partially fund an acquisition.

As of March 31, 2018, we had total indebtedness of $801,606, including $792,591 of borrowings under the First Lien Term Loan Facility, no borrowings under our Revolving Credit Facility, $6,423 in borrowings related to BOO financing and $2,592 of notes payable related to certain equipment related contracts. We also had $20,612 of letters of credit issued under our $125,000 Revolving Credit Facility and an additional $51 of letters of credit issued under a separate uncommitted facility as of March 31, 2018.

Our senior secured credit facilities contain a number of covenants imposing certain restrictions on our business. These restrictions may affect our ability to operate our business and may limit our ability to take advantage of potential business opportunities as they arise. The restrictions these covenants place on our business operations, include limitations on our or our subsidiaries’ ability to:

• incur or guarantee additional indebtedness;

• make certain investments;

• pay dividends or make distributions on our capital stock;

• sell assets, including capital stock of restricted subsidiaries;

• agree to payment restrictions affecting our restricted subsidiaries;

• consolidate, merge, sell or otherwise dispose of all or substantially all of our assets;

• enter into transactions with our affiliates;

• incur liens; or

• designate any of our subsidiaries as unrestricted subsidiaries.

We are a holding company and do not conduct any business operations of our own. As a result, our ability to pay cash dividends on our common stock, if any, is dependent upon cash dividends and distributions and other transfers from our operating subsidiaries. Under the terms of our senior secured credit facilities, our operating subsidiaries are currently limited in their ability to pay cash dividends to us, and we expect these limitations to continue in the future under the terms of any future credit agreement or any future debt or preferred equity securities of ours or of our subsidiaries.

54

In addition, our Revolving Credit Facility, but not the First Lien Term Loan Facility, contains a financial covenant which requires us to comply with the maximum first lien net leverage ratio of 5.55 to 1.00 as of the last day of any quarter on which the aggregate amount of revolving loans and letters of credit outstanding under the Revolving Credit Facility (net of cash collateralized letters of credit and undrawn outstanding letters of credit in an amount of up to 50% of the Revolving Credit Facility) exceeds 25% of the total commitments thereunder.

As of September 30, 2017 and March 31, 2018, we were in compliance with the covenants contained in the senior secured credit facilities.

Our indebtedness could adversely affect our ability to raise additional capital, limit our ability to react to changes in the economy or our industry, expose us to interest rate risk and prevent us from meeting our obligations.

Cash Flows

The following table summarizes the changes to our cash flows for the periods presented:

	Six Months Ended March 31,
	2017			2018
Statement of Cash Flows Data	(in thousands)
Net cash (used in) provided by operating activities	$	(346	)	$	41,851
Net cash used in investing activities	(37,944		)	(41,646		)
Net cash provided by financing activities	43,516			16,015
Effect of exchange rate changes on cash	(586		)	268
Change in cash and cash equivalents	$	4,640		$	16,488

Operating Activities

Cash flows from operating activities can fluctuate significantly from period‑to‑period as working capital needs and the timing of payments for restructuring activities and other items impact reported cash flows.

Net cash provided by operating activities increased to a source of $41,851 in the six months endedMarch 31, 2018 from a use of $346 in the six months endedMarch 31, 2017.

• Operating cash flows in the six months endedMarch 31, 2018 reflect an increase in net earnings of $18,280 as compared to the six months endedMarch 31, 2017 and decreased non‑cash charges of $5,775 primarily relating to a reduction in deferred taxes and the foreign currency impact on the intracompany loans, partially offset by increased share-based compensation expenses.

• The aggregate of receivables, inventories, cost and earnings in excess of billings on uncompleted contracts, accounts payable and billings in excess of costs incurred on uncompleted contracts provided $26,951 in operating cash flows in the six months endedMarch 31, 2018 compared to a use of $15,275 in operating cash flows in the six months endedMarch 31, 2017. The amount of cash flow generated from or used by the above mentioned accounts depends upon how effectively we manage our cash conversion cycle, which is a representation of the number of days that elapse from the date of purchase of raw materials and components to the collection of cash from customers. Our cash conversion cycle can be significantly impacted by the timing of collections and payments in a period. Further, as it relates to capital projects, fiscal 2017 represented a continued rebuilding of the pipeline of capital projects as compared to the period prior to the Acquisition, which represented a depletion of the pipeline of capital projects. This build‑up of capital project activity contributed to the variability of accounts receivable, inventories, excess billings

55

on uncompleted contracts or billings in excess of costs incurred on uncompleted contracts from period to period.

• The aggregate of prepaid expense and other assets, income taxes and other non current assets and liabilities used $6,790 in operating cash flows in the six months endedMarch 31, 2018 compared to a use of $364 in the six months endedMarch 31, 2017. This is mainly due to timing of payments.

• Accrued expenses and other liabilities used $30,810 in operating cash flows in the six months endedMarch 31, 2018 compared to a use of $13,152 in the six months endedMarch 31, 2017. The increased use of operational cash flow in both periods resulted primarily from timing of cash payments for various employee-related liabilities along with the payment of accrued expenses related to the IPO and other transactions.

Investing Activities

Net cash used in investing activities increased $3,702 from $37,944 in the six months endedMarch 31, 2017 to $41,646 in the six months endedMarch 31, 2018. This increase was largely driven by the increased spending on property, plant and equipment during the six months endedMarch 31, 2018.

Financing Activities

Net cash used by financing activities decreased $27,501 from $43,516 in the six months endedMarch 31, 2017 to $16,015 in the six months endedMarch 31, 2018. This lower amount of cash provided by financing activities for the six months endedMarch 31, 2018 was primarily due to the issuance of debt that occurred during the six months ended of the prior year. This change was offset by $137,605 cash received upon the issuance of stock during the IPO, net of the $100,000 prepayment of debt made in November of 2017.

Seasonality

While we do not believe it to be significant, our business does exhibit seasonality resulting from our customers’ increasing demand for our products and services during the spring and summer months as compared to the fall and winter months. For example, our Municipal Segment experiences increased demand for our odor control product lines and services in the warmer months which, together with other factors, typically results in improved performance in the second half of our fiscal year. Inclement weather, such as hurricanes, droughts and floods, can also drive increased demand for our products and services. As a result, our results from operations may vary from period to period.

Off‑Balance Sheet Arrangements

As of September 30, 2017 and March 31, 2018, we had letters of credit totaling $17,274 and $20,663, respectively, and surety bonds totaling $87,849 and $98,820, respectively, outstanding under our credit arrangements. The longest maturity date of the letters of credit and surety bonds in effect as of September 30, 2017 was March 31, 2024. Additionally, as of September 30, 2017 and March 31, 2018, we had letters of credit totaling $901 and $922, respectively, and surety bonds totaling $12,970 and $5,570, respectively, outstanding under our prior arrangement with Siemens.

Contractual Obligations

We enter into long‑term obligations and commitments in the normal course of business, primarily debt obligations and non‑cancelable operating leases. As of March 31, 2018, our contractual cash obligations over the next several periods were as follows (in thousands):

56

	Total		Less than 1 year		1 to 3 years		3 to 5 years		More than 5 years
	(in thousands)
Operating lease commitments(a)	$	44,728	$	10,561	$	16,838	$	8,293	$	9,036
Capital lease commitments(b)	33,337		10,285		15,784		6,175		1,093
Long‑term debt obligations	801,606		9,730		18,863		18,829		754,184
Interest payments on long‑term debt obligations	313,754		44,634		96,031		93,806		79,283
Natural gas commitments	6,713		6,713		—		—		—
Total	$	1,200,138	$	81,923	$	147,516	$	127,103	$	843,596

(a) We occupy certain facilities and operate certain equipment and vehicles under non‑cancelable lease arrangements. Lease agreements may contain lease escalation clauses and purchase and renewal options. We recognize scheduled lease escalation clauses over the course of the applicable lease term on a straight‑line basis.

(b) We lease certain equipment classified as capital leases. The leased equipment is depreciated on a straight line basis over the life of the lease and is included in depreciation expense.

Critical Accounting Policies and Estimates

See Note 2. Summary of Significant Accounting Policiesin the Unaudited Condensed Consolidated Financial Statements in Item 1 of this Report for a complete discussion of our significant accounting policies and recent accounting pronouncements.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

Interest Rate Risk

We have market risk exposure arising from changes in interest rates on our senior secured credit facilities, which bear interest at rates that are benchmarked against LIBOR. Based on our overall interest rate exposure to variable rate debt outstanding as of March 31, 2018, a 1% increase or decrease in interest rates would increase or decrease income (loss) before income taxes by approximately $7.9 million.

Impact of Inflation

Our results of operations and financial condition are presented based on historical cost. While it is difficult to accurately measure the impact of inflation due to the imprecise nature of the estimates required, we believe the effects of inflation, if any, on our results of operations and financial condition have been immaterial. We cannot provide any assurance, however, that our results of operations and financial condition will not be materially impacted by inflation in the future.

Foreign Currency Risk

We have global operations and therefore enter into transactions denominated in various foreign currencies. While we believe we are not susceptible to any material impact on our results of operations caused by fluctuations in exchange rates because our operations are primarily conducted in the United States, if we expand our foreign operations in the future, substantial increases or decreases in the value of the U.S. dollar relative to these other currencies could have a significant impact on our results of operations.

57

To mitigate cross-currency transaction risk, we analyze significant exposures where we have receipts or payments in a currency other than the functional currency of our operations, and from time to time we may strategically enter into short-term foreign currency forward contracts to lock in some or all of the cash flows associated with these transactions. We also are subject to currency translation risk associated with converting our foreign operations' financial statements into U.S. dollars. We use short-term foreign currency forward contracts and swaps to mitigate the impact of foreign exchange fluctuations on consolidated earnings. We use foreign currency derivative contracts in order to manage the effect of exchange fluctuations on forecasted sales, purchases, acquisitions, inventory, capital expenditures and certain intercompany transactions that are denominated in foreign currencies. We do not use derivative financial instruments for trading or speculative purposes.

Item 4.    Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

            Our management has evaluated, under the supervision and with the participation of our Chief Executive Officer and Chief Financial Officer, the effectiveness of our disclosure controls and procedures, as defined in Rule 13(a)-15(e) of the Exchange Act, as of the end of the period covered by this Report. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures as of the end of the period covered by this Report are effective at a reasonable assurance level in ensuring that information required to be disclosed in our Exchange Act reports is (1) recorded, processed, summarized and reported in a timely manner and (2) accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. Our management, including our Chief Executive Officer and Chief Financial Officer, does not expect that our disclosure controls and procedures will prevent or detect all errors and all fraud.

While our disclosure controls and procedures are designed to provide reasonable assurance of their effectiveness, because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the Company have been detected.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during the quarterly period ended March 31, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

58

Part II - Other Information

Item 1. Legal Proceedings

From time to time, we are subject to various claims, charges and litigation matters that arise in the ordinary course of business. We believe these actions are a normal incident of the nature and kind of business in which we are engaged. While it is not feasible to predict the outcome of these matters with certainty, we do not believe that any asserted or unasserted legal claims or proceedings, individually or in the aggregate, will have a material adverse effect on our business, financial condition, results of operations or prospects.

Item 1A. Risk Factors

There have been no material changes to the information concerning risk factors as stated in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017, as filed with the SEC on December 4, 2017.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

           In March 2018, we issued 505,252 shares of our common stock to certain employees upon the exercise of stock options granted pursuant to the Stock Option Plan in connection with our secondary offering of common stock in March 2018, which amount gives effect to the net exercise by certain of such employees of a portion of their vested options to cover exercise price and applicable tax withholding obligations. This issuance was deemed to be exempt from registration under the Securities Act in reliance upon Section 4(a)(2) of the Securities Act and/or Rule 701 promulgated thereunder. The securities were issued directly by the registrant and did not involve a public offering or general solicitation.

Item 3.    Defaults Upon Senior Securities

None.

Item 4.    Mine Safety Disclosures

None.

Item 5.    Other Information

None.

Item 6.    Exhibits

The following exhibits are filed or furnished as a part of this report:

59

Exhibit No.	Exhibit Description
2.1	Quota Sale and Purchase Agreement between Giotto Water S.r.l. and WTG Holdings Cooperatief U.A., dated April 3, 2018 (incorporated by reference to Exhibit 2.1 to the Registrant's Form 8-K filed on April 6, 2018 (File No. 001-38272)).
10.1	Form of Nonqualified Stock Option Agreement under the Evoqua Water Technologies Corp. 2017 Equity Incentive Plan (incorporated by reference to Exhibit 10.1 to the Registrant's Form 8-K filed on April 4, 2018 (File No. 001-38272)).
10.2	Form of Restricted Stock Unit Agreement under the Evoqua Water Technologies Corp. 2017 Equity Incentive Plan (Employee Form) (incorporated by reference to Exhibit 10.2 to the Registrant's Form 8-K filed on April 4, 2018 (File No. 001-38272)).
31.1*	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) or Rule 15d-14(a) promulgated under the Securities Exchange Act of 1934, as amended.
31.2*	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) or Rule 15d-14(a) promulgated under the Securities Exchange Act of 1934, as amended.
32.1*	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
99.1*	Unaudited pro forma condensed consolidated financial statements of Evoqua Water Technologies Corp., including notes thereto.
99.2*	Press Release of Evoqua Water Technologies Corp. dated April 11, 2018

* Filed herewith.

60

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	EVOQUA WATER TECHNOLOGIES CORP.
May 8, 2018	/s/ RONALD C. KEATING
	By:	Ronald C. Keating
		Chief Executive Officer (Principal Executive Officer)
May 8, 2018	/s/ BENEDICT J. STAS
	By:	Benedict J. Stas
		Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

61

EX-31.1

Exhibit 31.1

CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Ronald C. Keating, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018 of Evoqua Water Technologies Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 8, 2018 /s/ RONALD C. KEATING ________________________________________ Ronald C. Keating  President, Chief Executive Officer and Director (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION OF THE PRINCIPAL FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Benedict J. Stas, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018 of Evoqua Water Technologies Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 8, 2018 /s/ BENEDICT J. STAS ____________________________________________ Benedict J. Stas Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

        In connection with the Quarterly Report on Form 10-Q of Evoqua Water Technologies Corp., a Delaware corporation (the “Company”), for the quarterly period ended March 31, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers of the Company certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge:

        (1)   The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

        (2)   The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 8, 2018	/s/ RONALD C. KEATING __________________________________________ Ronald C. Keating  President, Chief Executive Officer and Director (Principal Executive Officer)
Date: May 8, 2018	/s/ BENEDICT J. STAS _________________________________________ Benedict J. Stas  Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

EX-99.1

Evoqua Water Technologies

Pro Forma Condensed Consolidated Financial Information

(Unaudited)

On April 9, 2018, WTG Holdings Coöperatief U.A. (“WTG”), a wholly-owned subsidiary of Evoqua Water Technologies Corp. (the “Company”), completed the sale of 100% of the corporate capital of Evoqua Water Technologies S.r.l., which includes the Company’s former operations in Italy (the “Transaction”), to Giotto Water S.r.l. (“Giotto”). The aggregate purchase price paid in cash by Giotto in the Transaction was €350,000, subject to certain earn-out adjustments to be paid by Giotto in connection with the realization of specified tax benefits relating to previous years.

The Transaction constituted a significant disposition for purposes of Item 2.01 of Form 8-K. As a result, the Company prepared the accompanying unaudited pro forma condensed consolidated financial statements in accordance with Article 11 of Regulation S-X. The Transaction does not qualify as discontinued operations as it does not represent a strategic shift that will have a major impact on the Company's operations or financial results.

The accompanying unaudited pro forma condensed consolidated balance sheet as of December 31, 2017, gives effect to the Transaction as if the disposition occurred on December 31, 2017. The accompanying unaudited condensed consolidated statements of income for year ended September 30, 2017 and for the three months ended December 31, 2017, give effect to the Transaction as if the disposition had occurred on October 1, 2016. The pro forma adjustments are described in the accompanying notes and are based upon information and assumptions available at the time of the filing of this report on Form 8-K.

The unaudited pro forma financial information is based on financial statements prepared in accordance with U.S. generally accepted accounting principles, which are subject to change and interpretation. The unaudited pro forma condensed consolidated financial statements were based on and derived from our historical consolidated financial statements, adjusted for those amounts which were determined to be directly attributable to the Transaction, factually supportable, and with respect to the unaudited pro forma condensed consolidated statements of income, expected to have a continuing impact on our consolidated results. Actual adjustments, however, may differ materially from the information presented. Pro forma adjustments do not include allocations of corporate costs, as those are not directly attributable to the Transaction. In addition, the unaudited pro forma financial information is based upon available information and assumptions that management considers to be reasonable, and such assumptions have been made solely for purposes of developing such unaudited pro forma financial information for illustrative purposes in compliance with the disclosure requirements of the SEC. The unaudited pro forma financial information is not necessarily indicative of what the financial position or income statement results would have actually been had the Transaction occurred on the dates indicated. In addition, these unaudited pro forma condensed consolidated financial statements should not be considered to be indicative of our future consolidated financial performance and income statement results.

The unaudited pro forma condensed combined financial statements have been developed from and should be read in conjunction with Evoqua’s historical audited consolidated financial statements and accompanying notes contained in the Company’s Annual Report on Form 10-K for its fiscal year ended September 30, 2017, and Quarterly Report on Form 10-Q as of and for the three months ended December 31, 2017.

Evoqua Water Technologies Corp.

Proforma Condensed Consolidated Balance Sheet

(Unaudited)

	December 31, 2017
ASSETS	Historical		Pro Forma Adjustments				Pro Forma
	(in thousands)
Current assets		$520,436		($2,612	)			$517,824
Cash and cash equivalents	80,250		(1,617)			(a)	78,633
Receivables, net	226,719		(143)			(b)	226,576
Inventories, net	128,306		—				128,306
Cost and earnings in excess of billings on uncompleted contracts	65,038		(417)			(b)	64,621
Prepaid and other current assets	19,287		(435)			(b)	18,852
Income tax receivable	836		—				836
Property, plant, and equipment, net	281,507		(324)			(b)(f)	281,183
Goodwill	320,927		(84		)	(b)	320,843
Intangible assets, net	329,568		—				329,568
Deferred income taxes	2,968		—				2,968
Other non‑current assets	23,503		(217)			(b)	23,286
Total assets		$1,478,909		($3,237	)			$1,475,672
LIABILITIES AND EQUITY
Current liabilities		$263,746		($2,033	)			$261,713
Accounts payable	114,489		(80)			(b)	114,409
Current portion of debt	11,033		—				11,033
Billings in excess of costs incurred on uncompleted contract	36,511		—				36,511
Product warranties	9,807		(621)			(b)	9,186
Accrued expenses and other liabilities	88,793		(1,332)			(b)	87,461
Income tax payable	3,113		—				3,113
Non‑current liabilities	862,441		(21)				862,420
Long‑term debt	777,900		—				777,900
Product warranties	6,497		—				6,497
Other non‑current liabilities	68,884		(21)			(b)	68,863
Deferred income taxes	9,160		—				9,160
Total liabilities	1,126,187		(2,054)				1,124,133
Commitments and contingencies
Shareholders’ equity
Total Evoqua Water Technologies Corp. equity	347,377		(1,183		)	(b)	346,194
Non‑controlling interest	5,345		—				5,345
Total shareholders’ equity	352,722		(1,183		)		351,539
Total liabilities and shareholders’ equity		$1,478,909	$	(3,237	)			$1,475,672

Evoqua Water Technologies Corp.

Pro Forma Condensed Consolidated Statements of Operations

(unaudited)

	Year Ended September 30, 2017
	Historical			Pro Forma Adjustments (d)				Pro Forma
	(In thousands, except per share data)
Revenue from product sales	$	674,997		$	(1,149	)		$	673,848
Revenue from services	572,427			—				572,427
	1,247,424			(1,149		)		1,246,275
								—
Cost of product sales	(445,890		)	1,152				(444,738		)
Cost of services	(401,783		)					(401,783		)
	(847,673		)	1,152				(846,521		)
								—
Gross Profit	399,751			3				399,754
								—
General and administrative expense	(169,617		)	610				(169,007		)
Sales and marketing expense	(142,441		)	340				(142,101		)
Research and development expense	(19,990		)	—				(19,990		)
Other operating income	2,361			1,242			(e)	3,603
Other operating expense	(860		)	—				(860		)
Interest expense	(55,377		)	(89		)		(55,466		)
Income before income taxes	13,827			2,105				15,932
Income expense benefit	(7,417		)	(58		)		(7,475		)
Net income	6,410			2,047				8,457
Net income attributable to     noncontrolling interest	4,247			—				4,247
Net income attributable to Evoqua Water     Technologies Corp.	$	2,163		$	2,047			$	4,210
Basic (loss) earnings per common share	$	0.02		$	0.02			$ 0.04
Diluted (loss) earnings per common share	$	0.02		$	0.02			$ 0.04

Evoqua Water Technologies Corp.

Pro Forma Condensed Consolidated Statements of Operations

(unaudited)

	Three Months Ended December 31, 2017
	Historical			Pro Forma Adjustments (d)				Pro Forma
	(in thousands, except per share data)
Revenue from product sales and services		$297,051			($148	)			$296,903
Cost of product sales and services	(208,672)			(741		)		(209,413)
Gross Profit	88,379			(889)				87,490
General and administrative expense	(39,064)			90				(38,974)
Sales and marketing expense	(34,241)			75				(34,166)
Research and development expense	(4,653)			—				(4,653)
Other operating expense	(593)			60			(e)	(533)
Interest expense	(17,243)			(17)				(17,260)
Loss before income taxes	(7,415)			(680)				(8,095)
Income tax benefit	4,410			—				4,410
Net loss	(3,005)			(680)				(3,685)
Net income attributable to non‑controlling interest	708			—				708
Net loss attributable to Evoqua Water Technologies Corp.	($3,713)			($680)				($4,393)
Basic (loss) earnings per common share		($0.03	)		($0.01	)			($0.04	)
Diluted (loss) earnings per common share		($0.03	)		($0.01	)			($0.04	)

Evoqua Water Technologies

Notes to the Pro Forma Condensed Consolidated Financial Information

(Unaudited)

Note 1 - Basis of Presentation

The unaudited pro forma condensed consolidated financial statements give effect to the pro forma adjustments necessary to reflect the Italy disposition as if the transaction had occurred as of October 1, 2016, in the unaudited pro forma statements of operations for the three months ended December 31, 2017, and for the year ended September 30, 2017 and on December 31, 2017, in the unaudited pro forma balance sheet.

Note 2 - Pro Forma Adjustments

The unaudited pro forma condensed consolidated financial statements represent the following adjustments:

(a) To adjust cash and cash equivalents for the receipt of cash proceed from the Italy disposition of $430 (350 euro).

(b) To eliminate assets and liabilities as of December 31, 2017 related to the assets sold.

(c) To adjust shareholder's equity, which amount is primarily related to the accumulated retained losses in addition to the insignificant estimated gain on sale from the Italy disposition that would have been recorded on December 31, 2017.

(d) To eliminate revenues and expenses, including the impact, related to the operations of the assets sold for the three months ended December 31, 2017 and the year ended September 30, 2017.

(e) Included within Other operating income during the year ended September 30, 2017, and the three months ended December 31, 2017, were impairment charges related to Italy's building and intangible assets. The gain directly attributable to the Italy disposition is not expected to have a continuing impact on the Company's operations, and therefore, is not reflected in the unaudited pro forma condensed consolidated statement of operations for the year ended September 30, 2017 and the three months ended December 31, 2017.

(f) Italy's building and land were sold in separate transactions to other parties prior to the Italy disposition.

EX-99.2

Exhibit 99.2

Evoqua and Giotto Enter Agreement for Distribution of Evoqua’s Memcor® UF & MBR Membrane Products

PITTSBURGH (USA), April 11, 2018 - Evoqua Water Technologies Ltd., a wholly-owned subsidiary of Evoqua Water Technologies Corp., and Giotto Water S.r.l. have entered into an exclusive agreement in relation to the distribution of Evoqua’s Memcor® product range in Europe. Under the terms of the agreement Giotto will have exclusive rights to market and sell Memcor ultrafiltration and Membrane Bioreactor (MBR) products in select territories throughout Europe.

“We are delighted to enter into this agreement with Giotto for our Memcor product range,” said Ben Soucy, VP/General Manager of Evoqua’s Memcor division. “As a global leader, Memcor has a rich history and strong installed base, especially our MBR offerings throughout Italy. We are excited to leverage the additional local reach and expertise of Giotto within Italy and other European markets we are not currently serving.”

Evoqua has more than 20 MBR installations operating in Italy, including one of the largest in Europe at Santa Giustina in Rimini, treating an average daily flow of 76 million liters (Rimini Case Study).

For many Italian municipalities, particularly in coastal areas that depend on good quality water to support tourism and agriculture, industries vital to their economy, high-quality treated water coupled with a small footprint afforded by the MBR technology makes it a leading choice for wastewater treatment in recent years.

Global MBR growth rates are largely driven by the need to process more wastewater in less space. As membrane technology has advanced it has become a reliable and accepted barrier for pathogen removal making MBRs an important platform for water reuse, providing water security for thriving economies.

“With this agreement, Giotto Water completes its products portfolio as a technology partner,” said Enzo Bina, Managing Director of Giotto Water Srl. “For Giotto Water this agreement is very important, as it allows us to combine our traditional equipment offering with one of the more strategic technologies in the Italian and European markets. The industry leading position of the Memcor membranes, coupled with the proven global references in municipal and industrial applications, will give us the possibility to provide a complete and state-of-the-art, full-service solution to our customers.”

In a separate transaction, Evoqua has sold all the remaining operations of its former Italy business, including customer contracts, to Giotto.

About Evoqua Water Technologies

Evoqua Water Technologies is a leading provider of mission critical water treatment solutions, offering services, systems and technologies to support its customers’ full water lifecycle needs. Evoqua Water Technologies has worked to protect water, the environment and its employees for more than 100 years, earning a reputation for quality, safety and reliability around the world. Headquartered in Pittsburgh, Pennsylvania, Evoqua operates 160 locations in eight countries and, with over 200,000 installations and 87 service branches, holds leading positions in the North American industrial, commercial and municipal water treatment markets, serving more than 38,000 customers worldwide. For more information, visit www.evoqua.com

About Giotto Water S.r.l.

GIOTTO WATER operates all over the world in the environmental field for over 40 years, with a wide product portfolio of specific technologies and solutions for treatment of water, wastewater and sludge for both municipal and industrial applications. Giotto Water’s goal is to improve the treatment processes, enabling Customers to optimize their systems by treating the water for re-use, by reducing the production of sludge and by proposing solutions for energy recovery and valorization of the sludge. Its portfolio includes, in addition to the traditional “SERNAGIOTTO” product line, systems for secondary biological treatment and tertiary filtration of wastewater treatment plants. Giotto Water’s mission is to satisfy Customer’s requirements, starting from the design phase through installation and aftermarket assistance, with its spare parts stock and experienced service team. For more information, visit www.giottowater.com

Contacts:

MediaInvestors

Kevin G. LoweryDan Brailer

724-772-1527 (office)724-720-1605 (office)

724-719-1475 (mobile)(412) 977-2605 (mobile)

kevin.lowery@evoqua.comdan.brailer@evoqua.com

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Document And Entity Information Statement - shares	6 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2018
Entity Registrant Name	EVOQUA WATER TECHNOLOGIES CORP.
Entity Central Index Key	0001604643
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		113,786,702

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
ASSETS
Current assets	$ 530,872	$ 512,240
Cash and cash equivalents	75,742	59,254
Receivables, net	217,852	245,248
Inventories, net	136,251	120,047
Cost and earnings in excess of billings on uncompleted contracts	74,792	66,814
Prepaid and other current assets	25,394	20,046
Income tax receivable	841	831
Property, plant, and equipment, net	285,687	280,043
Goodwill	329,898	321,913
Intangible assets, net	323,515	333,746
Deferred income taxes	7,140	2,968
Other non‑current assets	22,747	22,399
Total assets	1,499,859	1,473,309
LIABILITIES AND EQUITY
Current liabilities	282,645	291,899
Accounts payable	138,454	114,932
Current portion of debt	11,057	11,325
Billings in excess of costs incurred	25,040	27,124
Product warranties	8,746	11,164
Accrued expenses and other liabilities	91,998	121,923
Income tax payable	7,350	5,431
Non‑current liabilities	856,138	964,835
Long‑term debt	775,984	878,524
Product warranties	3,790	6,110
Other non‑current liabilities	66,080	67,673
Deferred income taxes	10,284	12,528
Total liabilities	1,138,783	1,256,734
Commitments and Contingent Liabilities (Note 17)
Shareholders’ equity
Common stock, par value $0.01: authorized 1,000,000 shares; issued 105,359 shares, outstanding 104,949 shares at September 30, 2017; issued 114,710 shares, outstanding 113,769 shares at March 31, 2018.	1,142	1,054
Treasury stock: 410 shares at September 30, 2017 and 941 shares at March 31, 2018.	(2,837)	(2,607)
Additional paid‑in capital	525,997	388,986
Retained deficit	(161,216)	(170,006)
Accumulated other comprehensive loss, net of tax	(6,782)	(5,989)
Total Evoqua Water Technologies Corp. equity	356,304	211,438
Non‑controlling interest	4,772	5,137
Total shareholders’ equity	361,076	216,575
Total liabilities and shareholders’ equity	$ 1,499,859	$ 1,473,309

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Condensed Consolidated Balance Sheets Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	1,000,000,000	1,000,000,000
Common stock issued (in shares)	114,710,000	105,359,000
Common stock outstanding (in shares)	113,769,000	104,964,000
Treasury stock (in shares)	941,000	410,000

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Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenues [Abstract]
Revenue from product sales and services	$ 333,690	$ 299,901	$ 630,740	$ 579,773
Cost of Revenue [Abstract]
Cost of product sales and services	(225,693)	(205,568)	(434,364)	(403,372)
Gross profit	107,997	94,333	196,376	176,401
Operating Expenses [Abstract]
General and administrative expense	(44,742)	(40,211)	(83,807)	(89,397)
Sales and marketing expense	(34,330)	(36,690)	(68,571)	(71,783)
Research and development expense	(4,021)	(5,086)	(8,674)	(10,091)
Other operating (expense) income	904	(365)	311	1,309
Interest expense	(10,810)	(11,898)	(28,053)	(26,651)
Income (loss) before income taxes	14,998	83	7,582	(20,212)
Income tax benefit (expense)	(2,018)	4,812	2,393	11,907
Net income (loss)	12,980	4,895	9,975	(8,305)
Net income attributable to non‑controlling interest	477	1,697	1,185	2,096
Net income (loss) attributable to Evoqua Water Technologies Corp.	$ 12,503	$ 3,198	$ 8,790	$ (10,401)
Basic (loss) earnings per common share (in dollars per share)	$ 0.11	$ 0.03	$ 0.08	$ (0.10)
Diluted (loss) earnings per common share (in dollars per share)	$ 0.10	$ 0.03	$ 0.07	$ (0.10)

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Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 12,980	$ 4,895	$ 9,975	$ (8,305)
Other comprehensive income
Foreign currency translation adjustments	(458)	2,581	(793)	5,800
Less: Comprehensive income attributable to non‑controlling interest	(477)	(1,697)	(1,185)	(2,096)
Comprehensive income (loss) attributable to Evoqua Water Technologies Corp.	$ 12,045	$ 5,779	$ 7,997	$ (4,601)

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Unaudited Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid‑in Capital	Retained Deficit	Accumulated Other Comprehensive Loss	Non‑controlling Interest
Common stock issued at the beginning of the period (shares) at Sep. 30, 2016		104,495
Stockholders' equity, balance at the beginning of the period at Sep. 30, 2016	$ 203,935	$ 1,045	$ (1,133)	$ 381,223	$ (172,169)	$ (10,671)	$ 5,640
Treasury stock, balance at the beginning of the period (in shares) at Sep. 30, 2016			245
Equity based compensation expense	1,020			1,020
Issuance of common stock (in shares)		593
Issuance of common stock	4,151	$ 6		4,145
Stock repurchases (shares)			81
Stock repurchases	(543)		$ (543)
Dividends paid to non‑controlling interest	(3,500)						(3,500)
Net income (loss)	(8,305)				(10,401)		2,096
Other comprehensive loss	5,800					5,800
Common stock issued at the end of the period (shares) at Mar. 31, 2017		105,088
Stockholders' equity, balance at the end of the period at Mar. 31, 2017	$ 202,558	$ 1,051	$ (1,676)	386,388	(182,570)	(4,871)	4,236
Treasury stock, balance at the end of the period (in shares) at Mar. 31, 2017			326
Common stock issued at the beginning of the period (shares) at Sep. 30, 2017	105,359	105,359
Stockholders' equity, balance at the beginning of the period at Sep. 30, 2017	$ 216,575	$ 1,054	$ (2,607)	388,986	(170,006)	(5,989)	5,137
Treasury stock, balance at the beginning of the period (in shares) at Sep. 30, 2017	410		410
Equity based compensation expense	$ 6,862			6,862
Issuance of common stock (in shares)		8,333
Issuance of common stock	137,605	$ 83		137,522
Shares withheld related to net share settlement (including tax withholdings) (shares)		1,018	513
Shares withheld related to net share settlement (including tax withholdings)	(7,368)	$ 5		(7,373)
Stock repurchases (shares)			18
Stock repurchases	(230)		$ (230)
Dividends paid to non‑controlling interest	(1,550)						(1,550)
Net income (loss)	9,975				8,790		1,185
Other comprehensive loss	$ (793)					(793)
Common stock issued at the end of the period (shares) at Mar. 31, 2018	114,710	114,710
Stockholders' equity, balance at the end of the period at Mar. 31, 2018	$ 361,076	$ 1,142	$ (2,837)	$ 525,997	$ (161,216)	$ (6,782)	$ 4,772
Treasury stock, balance at the end of the period (in shares) at Mar. 31, 2018	941		941

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Unaudited Condensed Consolidated Statements of Changes in Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net loss	$ 9,975	$ (8,305)
Reconciliation of net loss to cash flows from operating activities:
Depreciation and amortization	40,363	37,520
Amortization of deferred financing costs (includes $2,075 and $2,994 write off of deferred financing fees)	4,145	4,576
Deferred income taxes	(6,013)	(11,015)
Share-based compensation	6,862	1,020
(Gain) loss on sale of property, plant and equipment	102	(446)
Foreign currency losses (gains) on intracompany loans	(2,934)	5,095
Changes in assets and liabilities
Accounts receivable	28,946	(5,093)
Inventories	(14,936)	(8,826)
Cost and earnings in excess of billings on uncompleted contracts	(7,848)	1,401
Prepaids and other current assets	(5,156)	(1,090)
Accounts payable	22,821	(1,552)
Accrued expenses and other liabilities	(30,810)	(13,152)
Billings in excess of costs incurred	(2,032)	(1,205)
Income taxes	1,849	(3,497)
Other non‑current assets and liabilities	(3,483)	4,223
Net cash (used in) provided by operating activities	41,851	(346)
Investing activities
Purchase of property, plant and equipment	(31,670)	(27,229)
Purchase of intangibles	(291)	(410)
Proceeds from sale of property, plant and equipment	539	425
Acquisitions, net of cash acquired of $0 and $39	(10,224)	(10,730)
Net cash used in investing activities	(41,646)	(37,944)
Financing activities
Issuance of debt	0	150,000
Capitalized deferred issuance costs related to refinancing	(1,792)	(4,198)
Borrowings under credit facility	6,000	33,000
Repayment of debt	(111,161)	(132,738)
Repayment of capital lease obligation	(5,489)	(2,656)
Proceeds from issuance of common stock	137,605	4,151
Taxes paid related to net share settlements of share-based compensation awards	(7,368)	0
Stock repurchases	(230)	(543)
Distribution to non‑controlling interest	(1,550)	(3,500)
Net cash provided by financing activities	16,015	43,516
Effect of exchange rate changes on cash	268	(586)
Change in cash and cash equivalents	16,488	4,640
Cash and cash equivalents
Beginning of period	59,254	50,362
End of period	75,742	55,002
Supplemental disclosure of cash flow information
Cash paid for taxes	2,077	1,759
Cash paid for interest	20,503	20,704
Non‑cash investing and financing activities
Accrued earnout related to acquisitions	461	0
Capital lease transactions	$ 3,948	$ 7,054

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Unaudited Condensed Consolidated Statements of Changes in Cash Flows (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Deferred finance costs	$ 2,944
Net of cash acquired	$ 39	$ 0

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Description of the Company and Basis of Presentation

6 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of the Company and Basis of Presentation

Description of the Company and Basis of Presentation

Background

Evoqua Water Technologies Corp. was incorporated on October 7, 2013. On January 15, 2014, Evoqua Water Technologies Corp., acquired through its wholly owned entities, EWT Holdings II Corp. and EWT Holdings III Corp. (a/k/a Evoqua Water Technologies), all of the outstanding shares of Siemens Water Technologies, a group of legal entity businesses formerly owned by Siemens AG (Siemens). The stock purchase closed on January 15, 2014 and was effective January 16, 2014 (the Acquisition). The stock purchase price, net of cash received, was approximately $730,577. On November 6, 2017, the Company completed its initial public offering (IPO), pursuant to which an aggregate of 27,777 shares of common stock were sold, of which 8,333 were sold by the Company and 19,444 were sold by the selling stockholders, with a par value of $0.01 per share. After underwriting discounts and commissions, the Company received net proceeds from the IPO of approximately $137,605. The Company used a portion of these proceeds to repay $104,936 of indebtedness (including accrued and unpaid interest) under its senior secured First Lien Term Loan facility and the remainder for general corporate purposes. The Company did not receive any proceeds from the sale of shares by the selling stockholders. On November 7, 2017, the selling stockholders sold an additional 4,167 shares of common stock as a result of the exercise in full by the underwriters of an option to purchase additional shares. On March 19, 2018, the Company completed a secondary public offering, pursuant to which 17,500 shares of common stock were sold by certain selling stockholders. On March 21, 2018, the selling stockholders sold an additional 2,625 shares of common stock as a result of the exercise in full by the underwriters of an option to purchase additional shares. The Company did not receive any proceeds from the sale of shares by the selling stockholders.

Evoqua Water Technologies Corp. and subsidiaries is referred to herein as “the Company” or “EWT”.

The Business

EWT provides a wide range of product brands and advanced water and wastewater treatment systems and technologies, as well as mobile and emergency water supply solutions and service contract options through its segment branch network. Headquartered in Pittsburgh, Pennsylvania, EWT is a multi‑national corporation with operations in the United States, Canada, the United Kingdom, the Netherlands, Italy, Germany, Australia, China, and Singapore.

The Company is organizationally structured into three reportable segments for the purpose of making operational decisions and assessing financial performance: (i) Industrial, (ii) Municipal and (iii) Products.

Basis of Presentation

The accompanying Unaudited Condensed Consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP). All intracompany transactions have been eliminated.

The unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such SEC rules. We believe that the disclosures made are adequate to make the information presented not misleading. We consistently applied the accounting policies described in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017, as filed with the SEC on December 4, 2017 (2017 Annual Report), in preparing these unaudited condensed consolidated financial statements, with the exception of accounting standard updates described in Note 2. These condensed consolidated financial statements should be read in conjunction with the audited financial statements and the notes included in our 2017 Annual Report.

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Summary of Significant Accounting Policies

6 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Fiscal Year

The Company’s fiscal year ends on September 30.

Use of Estimates

The unaudited condensed consolidated financial statements have been prepared in conformity with U.S. GAAP and require management to make estimates and assumptions. These assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Estimates and assumptions are used for, but not limited to: (i) revenue recognition; (ii) allowance for doubtful accounts; (iii) inventory valuation, asset valuations, impairment, and recoverability assessments; (iv) depreciable lives of assets; (v) useful lives of intangible assets; (vi) income tax reserves and valuation allowances; and (vii) product warranty and litigation reserves. Estimates are revised as additional information becomes available. Actual results could differ from these estimates.

Cash and Cash Equivalents

Cash and cash equivalents are liquid investments with an original maturity of three or fewer months when purchased.

Accounts Receivable

Receivables are primarily comprised of uncollected amounts owed to us from transactions with customers and are presented net of allowances for doubtful accounts. Allowances are estimated based on historical write‑offs and the economic status of customers. The Company considers a receivable delinquent if it is unpaid after the term of the related invoice has expired. Write‑offs are recorded at the time all collection efforts have been exhausted.

Inventories

Inventories are stated at the lower of cost or market, where cost is generally determined on the basis of an average or first‑in, first‑out (FIFO) method. Production costs comprise direct material and labor and applicable manufacturing overheads, including depreciation charges. The Company regularly reviews inventory quantities on hand and writes off excess or obsolete inventory based on estimated forecasts of product demand and production requirements. Manufacturing operations recognize cost of product sales using standard costing rates with overhead absorption which generally approximates actual cost.

Property, Plant, and Equipment

Property, plant, and equipment is valued at cost less accumulated depreciation and impairment losses. If the costs of certain components of an item of property, plant, and equipment are significant in relation to the total cost of the item, they are accounted for and depreciated separately. Depreciation expense is recognized using the straight‑line method. Useful lives are reviewed annually and, if expectations differ from previous estimates, adjusted accordingly. Estimated useful lives for major classes of depreciable assets are as follows:

Asset Class	Estimated Useful Life
Machinery and equipment	3 to 20 years
Buildings and improvements	10 to 40 years

Leasehold improvements are depreciated over the shorter of their estimated useful life or the term of the lease. Costs related to maintenance and repairs that do not extend the assets’ useful life are expensed as incurred.

Goodwill and Other Intangible Assets

Goodwill represents purchase consideration paid in a business combination that exceeds the value assigned to the net assets of acquired businesses. Other intangible assets consist of customer‑related intangibles, proprietary technology, software, trademarks and other intangible assets. The Company amortizes intangible assets with definite useful lives on a straight‑line basis over their respective estimated economic lives which range from 1 to 26 years.

The Company reviews goodwill to determine potential impairment annually during the fourth quarter of our fiscal year, or more frequently if events and circumstances indicate that the asset might be impaired. Impairment testing for goodwill is performed at a reporting unit level. We have determined that we have four reporting units. Our quantitative impairment testing utilizes both a market (guideline public company) and income (discounted cash flows) method for determining fair value. In estimating the fair value of the reporting unit utilizing a discounted cash flow (“DCF”) valuation technique, we incorporate our judgment and estimates of future cash flows, future revenue and gross profit growth rates, terminal value amount, capital expenditures and applicable weighted‑average cost of capital used to discount these estimated cash flows. The estimates and projections used in the estimate of fair value are consistent with our current budget and long‑range plans, including anticipated change in market conditions, industry trend, growth rates and planned capital expenditures, among other considerations.

Impairment of Long‑Lived Assets

Long‑lived assets, such as property, plant, and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Recoverability of the asset or asset group is measured by comparison of its carrying amount to undiscounted future net cash flows the asset or asset group is expected to generate. If the carrying amount of an asset or asset group is not recoverable, the Company recognizes an impairment loss based on the excess of the carrying amount of the asset or asset group over its respective fair value which is generally determined as the present value of estimated future cash flows or as the appraised value.

Debt Issuance Costs and Debt Discounts

Debt issuance costs are capitalized and amortized over the contractual term of the underlying debt using the straight line method which approximates the effective interest method. Debt discounts and lender arrangement fees deducted from the proceeds have been included as a component of the carrying value of debt and are being amortized to interest expense using the effective interest method.

Amortization of debt issuance costs and debt discounts/premiums included in interest expense were $1,003 and $606 for the three months ended March 31, 2017 and 2018, respectively and $2,501 and $1,151 for the six months ended March 31, 2017 and 2018, respectively.

In October 2016, the Company wrote off $2,075 of deferred financing fees related to the extinguishment of debt and incurred another $481 of fees related to a tack-on financing the Company completed on October 28, 2016.

In November 2017, the Company wrote off $1,844 of deferred financing fees related to a $100,000 prepayment of debt, then subsequently wrote off another $1,150 of fees in December of 2017 due to refinancing its First Lien Term Loan. The Company incurred another $2,131 of fees as a result of the December refinancing.

Revenue Recognition

Sales of goods and services are recognized when persuasive evidence of an arrangement exists, the price is fixed or determinable, collectability is reasonably assured and delivery has occurred or services have been rendered.

For sales of aftermarket parts or products with a low level of customization and engineering time, the Company recognizes revenues at the time risks and rewards of ownership pass, which is generally when products are shipped or delivered to the customer as the Company has no obligation for installation. Sales of short‑term service arrangements are recognized as the services are performed, and sales of long‑term service arrangements are typically recognized on a straight‑line basis over the life of the agreement.

For certain arrangements where there is significant customization to the product, the Company recognizes revenue under the provisions of Accounting Standards Codification (ASC) 605-35, Revenue Recognition – Construction-Type and Production-Type Contracts. These products include large capital water treatment projects, systems and solutions for municipal and industrial applications. Revenues from construction-type contracts are generally recognized under the percentage-of-completion method, based on the input of costs incurred to date as a percentage of total estimated contract costs. The nature of the contracts is generally fixed price with milestone billings. Approximately $57,818 and $70,520 of revenues from construction-type contracts were recognized on the percentage-of-completion method during the three months ended March 31, 2017 and 2018, respectively and $104,881 and $129,907 for the six months ended March 31, 2017 and 2018, respectively. Contract revenues and cost estimates are reviewed and revised quarterly at a minimum and the cumulative effect of such adjustments are recognized in current operations. The amount of such adjustments have not been material. Cost and earnings in excess of billings under construction‑type arrangements are recorded when contracts have net asset balances where contract costs plus recognized profits less recognized losses exceed progress billings. Billings in excess of costs incurred are recorded when contract progress billings exceed costs and recognized profit less recognized losses. Approximately $5,674 and $6,817 of revenues from construction-type contracts were recognized on a completed contract method, which is typically when the product is delivered and accepted by the customer, during the three months ended March 31, 2017 and 2018, respectively and $14,466 and $13,200 for the six months ended March 31, 2017 and 2018, respectively. The completed contract method is principally used when the contract is short in duration (generally less than twelve months) and where results of operations would not vary materially from those resulting from the use of the percentage-of-completion method.

Product Warranties

Accruals for estimated expenses related to warranties are made at the time products are sold and are recorded as a component of Cost of product sales in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss. The estimated warranty obligation is based on product warranty terms offered to customers, ongoing product failure rates, material usage and service delivery costs expected to be incurred in correcting a product failure, as well as specific obligations for known failures and other currently available evidence. The Company assesses the adequacy of the recorded warranty liabilities on a regular basis and adjusts amounts as necessary.

Shipping and Handling Cost

Shipping and handling costs are included as a component of cost of sales.

Income Taxes

The Company recognizes deferred tax assets and liabilities for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that included the enactment date. Valuation allowances are provided against deferred tax assets when it is deemed more likely than not that some portion or all of the deferred tax asset will not be realized within a reasonable time period. We assess tax positions using a two‑step process. A tax position is recognized if it meets a more‑likely‑than‑not threshold, and is measured at the largest amount of benefit that is greater than 50.0% percent of being realized. Uncertain tax positions are reviewed each balance sheet date.

Sales Taxes

Upon collection of sales tax from revenue, the amount of sales tax is placed into an accrued liability account. This liability is then relieved when the payment is sent to the proper government jurisdiction.

Foreign Currency Translation and Transactions

The functional currency for the international subsidiaries is the local currency. Assets and liabilities are translated into U.S. Dollars using current rates of exchange, while revenues and expenses are translated at the weighted‑average exchange rate for the period. The resulting translation adjustments are recorded in other comprehensive income/loss within shareholders equity.

Foreign currency transaction (gains) losses aggregated $2,036 and $2,305 for the three months ended March 31, 2017 and 2018, respectively, and $(5,209) and $3,688 for the six months ended March 31, 2017 and 2018, respectively, are primarily included in General and administrative expenses in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income.

Research and Development Costs

Research and development costs are expensed as incurred. The Company recorded $5,086 and $4,021 of costs for the three months ended March 31, 2017 and 2018, respectively and $10,091 and $8,674 for the six months ended March 31, 2017 and 2018, respectively.

Equity‑based Compensation

The Company measures the cost of awards of equity instruments to employees based on the grant‑date fair value of the award. Prior to the IPO, given the absence of a public trading market for our common stock, the fair value of the common stock underlying our share‑based awards was determined by our board, with input from management, in each case using the income and market valuation approach. Stock options are granted with exercise prices equal to or greater than the estimated fair market value on the date of grant as authorized by our compensation committee. The grant‑date fair value is determined using the Black‑Scholes model. The fair value, net of estimated forfeitures, is amortized as compensation cost on a straight‑line basis over the vesting period primarily as a component of General and administrative expenses. 

Earnings per Share

Basic earnings per common share is computed based on the weighted average number of shares of common stock outstanding during the period. Diluted earnings per common share is computed based on the weighted average number of shares of common stock, plus the effect of diluted potential common shares outstanding during the period using the treasury stock method. Diluted potential common shares include outstanding stock options.

Retirement Benefits

The Company applies, ASC Topic 715, Compensation—Retirement Benefits, which requires the recognition in pension obligations and accumulated other comprehensive income of actuarial gains or losses, prior service costs or credits and transition assets or obligations that have previously been deferred. The determination of retirement benefit pension obligations and associated costs requires the use of actuarial computations to estimate participant plan benefits to which the employees will be entitled. The significant assumptions primarily relate to discount rates, expected long‑term rates of return on plan assets, rate of future compensation increases, mortality, years of service, and other factors. The Company develops each assumption using relevant experience in conjunction with market‑related data for each individual country in which such plans exist. All actuarial assumptions are reviewed annually with third‑party consultants and adjusted as necessary. For the recognition of net periodic postretirement cost, the calculation of the expected return on plan assets is generally derived by applying the expected long‑term rate of return on the market‑related value of plan assets. The fair value of plan assets is determined based on actual market prices or estimated fair value at the measurement date.

Treated Water Outsourcing

The following provides a summary of Treated Water Outsourcing (TWO), a joint venture between the Company and Nalco Water, an Ecolab company in which the Company holds a 50% partnership interest, as of September 30, 2017 and March 31, 2018, respectively. As the Company is obligated to absorb all risk of loss up to 100% of the joint venture partner's equity, TWO is fully consolidated within the Company's consolidated financial statements under ASC 810, Consolidation. The Company has not provided additional financial support to this entity which it is not contractually required to provide, and the Company does not have the ability to use the assets of TWO to settle obligations of the Company’s other subsidiaries.

	September 30, 2017			March 31, 2018
Current assets (including cash of $1,907 and $3,033)	$	12,006		$	8,043
Property, plant and equipment	6,107			5,704
Goodwill	2,206			2,206
Other non-current assets	2,735			—
Total liabilities	(12,781		)	(6,509		)
	Three Months Ended March 31,
	2017			2018
Total revenues	$	4,004		$	3,577
Total operating expenses	(3,485		)	(2,622		)
Income from operations	$	519		$	955
	Six Months Ended March 31,
	2017			2018
Total revenues	$	8,075		$	9,566
Total operating expenses	(5,768		)	(7,196		)
Income from operations	$	2,307		$	2,370

Recent Accounting Pronouncements

Accounting Pronouncements Not Yet Adopted

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09,Revenue from Contracts with Customers (Topic 606). ASU No. 2014-09 clarifies the principles for recognizing revenue when an entity either enters into a contract with customers to transfer goods or services or enters into a contract for the transfer of non-financial assets. ASU 2014-09 may be adopted using either of two acceptable methods: (1) retrospective adoption to each prior period presented with the option to elect certain practical expedients;or (2) adoption with the cumulative effect recognized at the date of initial application and providing certain disclosures. To assess at which time revenue should be recognized, an entity should use the following steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the entity satisfies a performance obligation. The standard is effective for the Company for the quarter ending December 31, 2018. The Company has completed its first phase of adopting this standard, which was to identify the potential differences that will result from applying the new revenue recognition standard to the Company's contracts with its customers, and has begun the second step of reviewing its contracts to determine the impact of adopting the standard. The Company has completed its preliminary assessment of the impact of the new standard compared to the historical accounting policies on a representative sample of contracts.  The Company does not anticipate a material change to result from the adoption of the new standard related to its product sales.  The Company recognizes revenue for some of its contracts on a percentage of completion basis, which represented approximately 20% of its consolidated net sales for the six months endedMarch 31, 2018.  The Company expects that for some of these contracts, the new guidance will instead require revenue to be recognized at a point in time.   The Company is continuing to assess the ultimate impact that the adoption of this standard will have on its consolidated financial statements and related disclosures.  In addition, the Company is evaluating the changes that will be required in its internal controls as a result of the adoption of this new standard.  The Company is planning to adopt the provisions of the ASU and its subsequent amendments using the modified retrospective transition method for existing transactions that will likely result in a cumulative effect adjustment as of October 1, 2018.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU No. 2016-02 requires recognition of operating leases as lease assets and liabilities on the balance sheet, and disclosure of key information about leasing arrangements. ASU No. 2016-02 will be effective retrospectively for the Company for the quarter ending December 31, 2019, with early adoption permitted. The Company is currently reviewing its leasing arrangements in order to evaluate the impact of this standard will have on the Company's Consolidated financial statements.

In August 2016, the FASB issued ASU 2016‑15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force). This new guidance is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. ASU No. 2016‑15 will be effective for the Company for the quarter ending December 31, 2018, with early adoption permitted. The guidance should be applied retrospectively to all periods presented, unless deem impracticable, in which case prospective application is permitted. The Company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

In October 2016, the FASB issued ASU 2016-17, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. The purpose of this update is to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. The ASU requires the tax effects of all intra-entity sales of assets other than inventory to be recognized in the period in which the transaction occurs. The guidance will be effective for the Company for the quarter ending December 31, 2018 with early adoption permitted but only in the first interim period of a fiscal year. The changes are required to be applied by means of a cumulative-effect adjustment recorded in retained earnings as of the beginning of the fiscal year of adoption.  The Company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

In February 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires the disaggregation of the service cost component from other components of net periodic benefit cost, clarifies how to present the service cost component and other components of net benefit costs in the Statements of Consolidated Operations and allows only the service cost component of net benefit costs to be eligible for capitalization. This ASU is effective for the Company for the quarter ending December 31, 2018. Adoption will be applied on a retrospective basis for the presentation of all components of net periodic benefit costs and on a prospective basis for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The company is currently evaluating the impact this guidance will have on the Consolidated financial statements and related disclosures.

In May 2017, the FASB issued ASU 2017‑09, Scope of Modification Accounting, which amended Accounting Standards Code Topic 718. FASB issued ASU 2017‑09 to reduce the cost and complexity when applying Topic 718 and standardize the practice of applying Topic 718 to financial reporting. The ASU was not developed to fundamentally change the definition of a modification, but instead to provide guidance for what changes would qualify as a modification. ASU No. 2017‑09 will be effective for us for the quarter ending December 31, 2018. The company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

Accounting Pronouncements Recently Adopted

The Company adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends ASC Topic 718, Compensation – Stock Compensation as of October 1, 2017. The ASU includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. The adoption of this ASU did not have a significant impact on the Company's Consolidated financial statements.

In January 2017, the FASB issued ASU 2017‑04, Simplifying the Test for Goodwill Impairment. This ASU simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures goodwill impairment loss by comparing the implied value of a reporting unit’s goodwill with the carrying amount of that goodwill. The amendments in this ASU are effective for the Company for the quarter ending December 31, 2020. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. ASU 2017-04 was early adopted by the Company for the year beginning October 1, 2017 and did not have a material impact on the Company's Consolidated financial statements.

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Acquisitions and Divestitures

6 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Acquisitions and Divestitures

Acquisitions and Divestitures

Acquisitions support the Company's strategy of delivering a broad solutions portfolio with robust technology across multiple geographies and end markets. The following acquisitions were made during the three months ended March 31, 2018.

The Company acquired Pure Water Solutions on January 31, 2018, a provider of high-purity water equipment and systems, service deionization and resin regeneration, with service operations in suburban Denver, CO and Santa Fe, NM for $4,699; $3,706 cash at closing with a maximum earn out payment of $993 to be paid out twelve months after the closing. The fair value of earn out payments at the date of acquisition was $461. Pure Water Solutions is part of a part of the Industrial Segment, and will extend the Company’s service network.

On March 9, 2018, the Company acquired Pacific Ozone Technology, Inc, a provider of advanced ozone disinfection systems, testing products and support services $8,557; $6,557 cash at closing; with up to another $2,000 of earn out payments to be paid out over three years after the closing. Pacific Ozone, based in Benecia, CA, is part of the Products Segment and adds a new technology, ozone disinfection, to the portfolio and further enhances the Company's ability in the industrial water treatment and aquatics market.

Pro forma results for acquisitions completed during the three months ended March 31, 2018 were determined to not be material.

The preliminary opening balance sheet for the acquisitions is summarized as follows.

	Pure Water			Pacific Ozone			Total
Current assets	$	277		$	1,418		$	1,695
Property, plant and equipment	175			192			367
Goodwill	2,369			5,863			8,232
Intangible assets	1,488			—			1,488
Total assets acquired	4,309			7,473			11,782
Total liabilities assumed	(154		)	(916		)	(1,070		)
Net assets acquired	$	4,155		$	6,557		$	10,712

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Fair Value Measurements

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement

Fair Value Measurements

As of September 30, 2017 and March 31, 2018, the fair values of cash and cash equivalents, accounts receivable and accounts payable approximate carrying values due to the short maturity of these items.

The Company measures the fair value of pension plan assets and liabilities, deferred compensation plan assets and liabilities on a recurring basis pursuant to ASC Topic 820. ASC Topic 820 establishes a three‑tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include:

Level 1: Quoted prices for identical instruments in active markets.

Level 2: Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model‑derived valuations whose inputs are observable or whose significant value driver is observable.

Level 3: Unobservable inputs in which little or no market data is available, therefore requiring an entity to develop its own assumptions.

The following table presents the Company’s financial assets and liabilities at fair value. The fair values related to the pension plan assets are determined using net asset value (NAV) as a practical expedient, or by information categorized in the fair value hierarchy level based on the inputs used to determine fair value. The reported carrying amounts of deferred compensation plan assets and liabilities and debt approximate their fair values. The Company uses interest rates and other relevant information generated by market transactions involving similar instruments to fair value these assets and liabilities, therefore all are classified as Level 2 within the valuation hierarchy.

	Net Asset Value		Quoted Market Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
As of September 30, 2017
Assets:
Pension plan
Cash	$	—	$	16,024	$	—		$	—
Government Securities	3,206		—		—			—
Liability Driven Investment	2,754		—		—			—
Guernsey Unit Trust	932		—		—			—
Global Absolute Return	2,139		—		—			—
Deferred compensation plan assets
Trust Assets	—		2,146		—			—
Insurance	—		—		17,396			—
Liabilities:
Pension plan	—		—		(34,803		)	—
Deferred compensation plan liabilities	—		—		(21,159		)	—
Long‑term debt	—		—		(912,471		)	—
As of March 31, 2018
Assets:
Pension plan
Cash	$	—	$	16,559	$	—		$	—
Government Securities	3,229		—		—			—
Liability Driven Investment	3,490		—		—			—
Guernsey Unit Trust	999		—		—			—
Global Absolute Return	2,235		—		—			—
Deferred compensation plan assets
Trust Assets	—		947		—			—
Insurance	—		—		17,905			—
Liabilities:
Pension plan	—		—		(34,803		)	—
Deferred compensation plan liabilities	—		—		(20,945		)	—
Long‑term debt	—		—		(806,361		)	—

The pension plan assets and liabilities and deferred compensation plan assets and liabilities are included in other non-current assets and other non-current liabilities at September 30, 2017 and March 31, 2018.

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Accounts Receivable

6 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Accounts receivable

Accounts Receivable

Accounts receivable are summarized as follows:

	September 30, 2017			March 31, 2018
Accounts Receivable	$	248,742		$	222,075
Allowance for Doubtful Accounts	(3,494		)	(4,223		)
Receivables, net	$	245,248		$	217,852

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Inventories

6 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories

The major classes of inventory, net are as follows:

	September 30, 2017			March 31, 2018
Raw materials and supplies	$	64,113		$	68,350
Work in progress	16,425			21,350
Finished goods and products held for resale	44,402			52,222
Costs of unbilled projects	5,706			5,407
Reserves for excess and obsolete	(10,599		)	(11,078		)
	$	120,047		$	136,251

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Property, Plant, and Equipment

6 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant, and Equipment

Property, plant, and equipment consists of the following:

	September 30, 2017			March 31, 2018
Machinery and equipment	$	338,056		$	356,277
Land and buildings	84,282			85,786
Construction in process	24,788			35,446
	447,126			477,509
Less: accumulated depreciation	(167,083		)	(191,822		)
	$	280,043		$	285,687

Depreciation expense was $12,958 and $13,980 for the three months ended March 31, 2017 and 2018, respectively. Maintenance and repair expense was $5,354 and $5,567 for the three months ended March 31, 2017 and 2018, respectively.

Depreciation expense was $25,385 and $27,987 for the six months ended March 31, 2017 and 2018, respectively. Maintenance and repair expense was $10,510 and $11,382 for the six months ended March 31, 2017 and 2018, respectively.

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Goodwill

6 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Goodwill

Changes in the carrying amount of goodwill are as follows:

	Industrial			Municipal		Products			Total
Balance at September 30, 2017	$	128,190		$	9,865	$	183,858		$	321,913
Business combinations	2,369			—		5,863			8,232
Measurement period adjustment	—			—		(314		)	(314		)
Foreign currency translation	(373		)	96		344			67
Balance at March 31, 2018	$	130,186		$	9,961	$	189,751		$	329,898

As of September 30, 2017 and March 31, 2018, $139,581 and $139,340, respectively, of goodwill is deductible for tax purposes.

The Neptune Benson reporting unit fair value excess was approximately 3.0% above the carrying value as of the date of valuation on July 1, 2017. The Company continues to monitor this reporting unit and noted no events that would cause a revaluation during the three months ending March 31, 2018.

All other reporting units significantly exceeded their carrying value and as such, no further analysis was performed.

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Debt

6 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

Debt

Long‑term debt consists of the following:

	September 30, 2017			March 31, 2018
First Lien Term Loan Facility, due December 20, 2024	$	896,574		$	792,591
Revolving Credit Facility	—			—
Build Own Operate Financing, due June 30, 2024	6,930			6,423
Notes Payable, due June 30, 2018 to July 31, 2023	3,287			2,592
Total debt	906,791			801,606
Less unamortized discount and lender fees	(16,942		)	(14,565		)
Total net debt	889,849			787,041
Less current portion	(11,325		)	(11,057		)
Total long‑term debt	$	878,524		$	775,984

Term Loan Facilities and Revolving Credit Facility

On January 15, 2014, EWT Holdings III Corp. (EWT III), an indirect wholly-owned subsidiary of the Company, entered into a First Lien Credit Agreement and Second Lien Credit Agreement (the Credit Agreements) among EWT III, EWT Holdings II Corp., the lenders party thereto and Credit Suisse AG as administrative agent and collateral agent. The First Lien Credit Agreement provided for a seven-year term loan facility, and the Second Lien Credit Agreement provided for an eight-year term loan facility. The term loan facilities originally consisted of the “First Lien Term Loan” and “Second Lien Term Loan” in aggregate principal amounts of $505,000 and $75,000, respectively.  The First Lien Credit Agreement also made available to the Company a $75,000 revolving credit facility (the Revolver), which provided for a letter of credit sub-facility up to $35,000. During the year ending September 30, 2017, certain subsidiaries of the Company entered into three amendments to the First Lien Credit Agreement, which provided for, among other things, the payoff and termination of the Second Lien Term Loan, upsizes to the First Lien Term Loan, and the upsize of the Revolver.

On December 20, 2017, certain subsidiaries of the Company entered into Amendment No. 5 (the Fifth Amendment), among EWT III, as the borrower, certain other subsidiaries of the Company, and Credit Suisse AG, as administrative agent and collateral agent, relating to the First Lien Credit Agreement (as amended, amended and restated, extended, supplemented or otherwise modified from time to time prior to the effectiveness of the Fifth Amendment, the "Existing Credit Agreement"). Prior to the Fifth Amendment, approximately $796,574 was outstanding under the First Lien Term Loan (the Existing Term Loans).  Pursuant to the Fifth Amendment, among other things, the Existing Term Loans were refinanced with the proceeds of refinancing Term Loans. Borrowings under the First Lien Term Loan Facility (First Lien Term Loan) bear interest consisting of the Base Rate plus 2.0%, or LIBOR plus 3.0%. At March 31, 2018, the interest rate on borrowings was 4.69%, comprised of 1.69% LIBOR plus the 3.0% spread. The principal and interest under the First Lien Term Loan is payable in quarterly installments, with quarterly principal payments of $1,991, and the balance is due at maturity on December 20, 2024. 

Total deferred fees related to the First Lien Term Loan were $16,942 and $14,565, net of amortization, as of September 30, 2017 and March 31, 2018, respectively.  These fees were included as a contra liability to debt on the Condensed Consolidated Balance Sheets.

The Fifth Amendment, among other things, extended the maturity of the Existing Term Loan to December 20, 2024 from January 15, 2021, reduced the interest rate spreads on Term Loan borrowing to to 3.00% from 3.75%, and increased the revolving credit commitment and letter of credit sublimit to $125,000 and $45,000 from $95,000 and $35,000, respectively. 

The Fifth Amendment bifurcated the Revolver, with $87,500 of the $125,000 revolver capacity maturing on December 20, 2022 (the 2022 Borrowings), and the remaining $37,500 maturing on January 15, 2019 (the “2019 Borrowings”).  Borrowings under the Revolver bear interest at variable rates plus a margin ranging from 200 to 325 basis points, and 150 to 275 basis points for 2019 and 2022 Borrowings, respectively, dependent upon the Company’s leverage ratio and variable rate selected.  2022 Base Rate borrowings under the Revolver would have incurred interest at 6.5% as of March 31, 2018, calculated as the 175 basis point spread plus the Base Rate of 4.75%.  2019 Base Rate borrowings under the Revolver at September 30, 2017 and March 31, 2018 would have incurred interest at 6.5% and 7%, respectively, calculated as the 225 basis point spread plus the Base Rate of 4.25% at September 30, 2017 and 4.75% at March 31, 2018.

The Company had borrowing availability under the Revolver of $95,000 and $125,000 at September 30, 2017 and March 31, 2018, respectively, reduced for outstanding letter of credit guarantees. Such letter of credit guarantees are subject to a $45,000 sublimit within the Revolver, increased from $35,000 as part of the Fifth Amendment.  The Company’s outstanding letter of credit guarantees under this agreement aggregated approximately $6,706 and $20,612, at September 30, 2017, and March 31, 2018, respectively. The Company had no outstanding revolver borrowings as of September 30, 2017, and March 31, 2018, and unused amounts, defined as total revolver capacity less outstanding letters of credit and revolver borrowings, of $88,294 and $104,388, respectively. At September 30, 2017 and March 31, 2018, the Company had additional letters of credit of $10,568 and $51 issued under a separate arrangement, respectively.

  The First Lien Credit Agreement contains limitations on incremental borrowings, is subject to leverage ratios and allows for optional prepayments. Under certain circumstances beginning with fiscal 2015 results of operations, the Company may be required to remit excess cash flows as defined based upon exceeding certain leverage ratios. The Company did not exceed such ratios during fiscal 2017, does not anticipate exceeding such ratios during the fiscal year 2018, and therefore does not anticipate any additional repayments during the fiscal year 2018.

Build Own Operate Financing

On June 30, 2017, the Company completed a Build Own Operate financing for $7,100.  The Company incurred $50 of additional financing fees related to this transaction, which have been capitalized and are included as a contra liability on the balance sheet. This financing fully amortizes over the seven-year tenure and incurs interest at a rate of one-month LIBOR plus 300 basis points. This variable rate debt has been fixed at a rate of 5.08% per annum. Principal obligations are $254 per quarter. The Company had $6,930 and $6,423 principal outstanding under this facility at September 30, 2017 and March 31, 2018, respectively.

Notes Payable

As of September 30, 2017 and March 31, 2018, the Company had notes payable in an aggregate outstanding amount of $3,287 and $2,592, respectively, with interest rates ranging from 6.26% to 7.39%, and due dates ranging from June 30, 2018 to July 31, 2023. These notes are related to certain equipment related contracts and are secured by the underlying equipment and assignment of the related contracts.

Repayment Schedule

Aggregate maturities of all long‑term debt, including current portion of long‑term debt and excluding capital lease obligations as of March 31, 2018, are presented below:

Fiscal Year
Remainder of 2018	$	4,978
2019	9,503
2020	9,402
2021	9,429
2022	9,459
Thereafter	758,835
Total	$	801,606

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Product Warranties

6 Months Ended

Mar. 31, 2018

Guarantees and Product Warranties [Abstract]

Product warranties

Product Warranties

The Company accrues warranty obligations associated with certain products as revenue is recognized. Provisions for the warranty obligations are based upon historical experience of costs incurred for such obligations, adjusted for site‑specific risk factors, and, as necessary, for current conditions and factors. There are significant uncertainties and judgments involved in estimating warranty obligations, including changing product designs, differences in customer installation processes and future claims experience which may vary from historical claims experience.

A reconciliation of the activity related to the accrued warranty, including both the current and long‑term portions, is as follows:

	Six Months Ended March 31,
	2017		2018
Balance at beginning of the period	$	23,309	$	17,274
Warranty provision for sales	3,245		2,386
Settlement of warranty claims	(7,657)		(7,559)
Foreign currency translation and other	(413)		435
Balance at end of the period	$	18,484	$	12,536

The decline in accrued warranty over the periods presented is attributable to improved product quality and better project execution, as well as the expiration of warranty periods for certain specific exposures related to discontinued products.

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Restructuring and Related Charges

6 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring and related charges

Restructuring and Related Charges

To better align its resources with its growth strategies and reduce the cost structure, the Company commits to restructuring plans as necessary. The Company initiated a Voluntary Separation Plan (VSP) during the year ended September 30, 2016, that continued throughout fiscal year 2017 and concluded during the six months ended March 31, 2018. The VSP plan includes severance payments to employees as a result of streamlining business operations for efficiency, elimination of redundancies, and reorganizing business processes. In addition, the Company has undertaken various other restructuring initiatives, including the wind down of the Company’s operations in Italy, restructuring of the Company’s operations in Australia, consolidation of functional support structures on a global basis, and consolidation of the Singaporean research and development center. The table below sets forth the amounts accrued for the restructuring components and related activity:

	Six Months Ended March 31,
	2017		2018
Balance at beginning of the period	$	13,217	$	3,542
Restructuring charges related to VSP	15,431		320
Charges related to other initiatives	3,295		5,964
Write off charge and other non‑cash activity	(374)		(308)
Cash payments	(24,325)		(9,095)
Other adjustments	(159)		28
Balance at end of the period	$	7,085	$	451

The balances for accrued restructuring liabilities at September 30, 2017 and March 31, 2018 are recorded in Accrued expenses and other liabilities. The Company expects to incur another $5,012 of restructuring charges during the remaining of fiscal year 2018. Restructuring charges primarily represent severance charges and of the amounts incurred above, $8,141, $4,874, $5,377, and $334 were included in Cost of product sales and services, General and administration expense, Sales and marketing expense and Research and development expense, respectively, during the six months ended March 31, 2017. During the six months ended March 31, 2018, $1,936, $3,113, $733, and $503 were included in Cost of product sales and services, General and administration expense, Sales and marketing expense and Research and development expense, respectively. The Company continues to evaluate restructuring activities that may result in additional charges in the future.

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Employee Benefit Plans

6 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Employee benefit plans

Employee Benefit Plans

The Company maintains multiple employee benefit plans.

Certain of the Company’s employees in the UK were participants in a Siemens defined benefit plan established for employees of a UK-based operation acquired by Siemens in 2004. The plan was frozen with respect to future service credits for active employees, however the benefit formula recognized future compensation increases. The Company agreed to establish a replacement defined benefit plan, with the assets of the Siemens scheme transferring to the new scheme on April 1, 2015.

The Company’s employees in Germany also participate in a defined benefit plan. Assets equaling the plan’s accumulated benefit obligation were transferred to a German defined benefit plan sponsored by the Company upon the acquisition of EWT from Siemens. The German entity also sponsors a defined benefit plan for a small group of employees located in France.

Pension expense for the German and UK plans were as follows:

	Three Months Ended March 31,
	2017		2018
Service cost	$	267	$	243
Interest cost	82		123
Expected return on plan assets	(40)		(32)
Amortization of actuarial losses	188		79
Pension expense for defined benefit plans	$	497	$	413
	Six Months Ended March 31,
	2017		2018
Service cost	$	518	$	475
Interest cost	159		241
Expected return on plan assets	(78)		(63)
Amortization of actuarial losses	364		155
Pension expense for defined benefit plans	$	963	$	808

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Income Taxes

6 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The income tax provision for interim periods is comprised of tax on ordinary income (loss) provided at the most recent estimated annual effective tax rate, adjusted for the tax effect of discrete items. Management estimates the annual effective tax rate each quarter based on the forecasted annual pretax income or (loss) of its U.S. and non-U.S. operations. Items unrelated to current year ordinary income or (loss) are recognized entirely in the period identified as a discrete item of tax. Discrete items generally relate to changes in tax laws, adjustments to prior year’s actual liability determined upon filing tax returns, adjustments to previously recorded reserves for uncertain tax positions, initially recording or fully reversing valuation allowances, and excess stock compensation deductions.

Effects of the Tax Cuts and Jobs Act

New tax legislation, commonly referred to as the Tax Cuts and Jobs Act (Tax Act), was enacted on December 22, 2017. ASC 740, Accounting for Income Taxes, requires companies to recognize the effect of tax law changes in the period of enactment even though the effective date for most provisions is for tax years beginning after December 31, 2017, or in the case of certain other provisions, January 1, 2018. Though certain key aspects of the new law are effective January 1, 2018 and have an immediate accounting effect, other significant provisions are not yet effective or may not result in accounting effects for September 30 fiscal year companies until October 1, 2018.

The SEC issued Staff Accounting Bulletin No. 118 (SAB 118), which allows registrants to record provisional amounts during a one year “measurement period” similar to that used when accounting for business combinations. During the measurement period, impacts of the law are expected to be recorded at the time a reasonable estimate for all or a portion of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared or analyzed. SAB 118 applies to measuring the impact of tax laws effecting the period of enactment, such as the change in tax rate to 21%, and does not extend to changes as part of the Tax Act that are not effective until after December 31, 2017, such as U.S. taxation of certain global intangible low-taxed income (GILTI).

The SAB summarizes a three-step process to be applied at each reporting period to account for and qualitatively disclose: (1) the effects of the change in tax law for which accounting is complete; (2) provisional amounts (or adjustments to provisional amounts) for the effects of the tax law where accounting is not complete, but that a reasonable estimate has been determined; and (3) that a reasonable estimate cannot yet be made and therefore taxes are reflected in accordance with law prior to the enactment of the Tax Cuts and Jobs Act.

Amounts recorded where accounting is complete in the six months ended March 31, 2018 principally relate to the reduction in the U.S. corporate income tax rate to 21%, which resulted in the Company reporting an income tax benefit of $3,641 to remeasure deferred taxes liabilities associated with indefinitely lived intangible assets that will reverse at the new 21% rate. Absent this deferred tax liability, the Company is in a net deferred tax asset position that is offset by a full valuation allowance. Though the impact of the rate change has a net tax effect of zero, the accounting to determine the gross change in the deferred tax position and the offsetting valuation is not yet complete.

The new law includes a one-time mandatory repatriation transition tax on the net accumulated earnings and profits of a U.S. taxpayer’s foreign subsidiaries. The Company has performed a preliminary analysis, and as a result of an expected overall accumulated deficit, it is not likely that the Company will have a liability for the transition tax. Therefore, the accounting for this matter is provisional until the accumulated earnings and profits analysis is finalized in fiscal 2018.

The Tax Act introduces other new provisions that are effective January 1, 2018 and changes how certain provisions are calculated for fiscal years ending September 30, 2018. These provisions include additional limitations on certain meals and entertainment expenses, and the inclusion of commissions and performance based compensation in determining the excessive compensation limitation applicable to certain employees. We do not expect these new provisions to have a material impact to the Company’s tax expense.

Other significant provisions that are not yet effective but may impact income taxes in future years include: an exemption from U.S. tax on dividends of future foreign earnings, a limitation on the current deductibility of net interest expense in excess of 30% of adjusted taxable income, a limitation on the use of net operating losses generated after fiscal 2018 to 80% of taxable income, an incremental tax (base erosion anti-abuse tax or BEAT) on excessive amounts paid to foreign related parties, and an income inclusion for foreign earnings in excess of 10% of the foreign subsidiaries tangible assets (GILTI). The company is still evaluating whether to make a policy election to treat the GILTI tax as a period expense or to provide U.S. deferred taxes on foreign temporary differences that are expected to generate GILTI income when they reverse in future years.

Annual Effective Tax Rate

The full year estimated annual effective tax rate, which excludes the impact of discrete items, was 63.1% and 13.0% as of the six months ended March 31, 2017 and 2018 and is reconciled to the U.S. statutory rate as follows.

For the six months ended March 31, 2017, the estimated annual effective tax rate of 63.1% was higher than the U.S federal statutory rate of 35.0% primarily due to a tax charge associated with indefinite deferred tax liabilities that were not offset by a valuation allowance. Other contributing factors were the mix of U.S. and non-U.S. income, and the statutory tax rates at which each is taxed, as well as permanently disallowed interest in certain foreign jurisdictions.

For the six months ended March 31, 2018, the U.S. federal statutory rate of 24.5% is a blended rate based upon the number of days in fiscal 2018 that the company will be taxed at the former statutory rate of 35.0% and the number of days that it will be taxed at the new rate of 21.0%. The estimated annual effective tax rate of 13.0% differs from this blended U.S. federal statutory rate principally due to higher forecasted earnings in the U.S. and certain non-U.S. jurisdictions that permitted the realization of net deferred tax assets which were previously impaired with a valuation allowance. The reduction in the U.S. statutory rate has lessened the impact of foreign statutory tax rate differences as a significant portion of the Company’s foreign income is in jurisdictions with a similar or slightly higher tax rate than 24.5%.

Prior and Current Period Tax Expense

For the six months ended March 31, 2017, income tax benefits of $11,907 as a percentage of pretax losses of $20,212 were 58.9%.   This is slightly less than the estimated annual effective tax rate of 63.1% as a result of discrete tax expense related to adjustments to the prior year actual liability upon the filing of certain foreign income tax returns during the period.

For the six months ended March 31, 2018, the Company recognized an income tax benefit of $2,393, which as a percentage of pretax income of $7,582 was 31.6%. This amount differs from the estimated annual effective tax rate of 13.0% as a result of a discrete tax benefit of $3,641 due to the remeasurement of U.S. deferred tax liabilities associated with indefinite lived intangible assets for the reduction in the U.S. statutory rate from 35.0% to 21.0%. Other discrete items were not material.

The Company projects to maintain a full valuation on U.S. federal and state net deferred tax assets (excluding the tax effects of deferred tax liabilities associated with indefinite lived intangibles) for the year ending September 30, 2018 as a result of pretax losses incurred since the Company’s inception in early 2014. Though the Company reported positive earnings for the first time in 2017 and is projecting earnings in 2018, management believes it is prudent to retain a valuation allowance until a more consistent pattern of actual earnings is established and net operating loss carryforwards begin to be utilized.

There are no amounts of unrecognized tax benefits recorded for the six months ended March 31, 2017 and 2018. Management does not reasonably expect any significant changes to unrecognized tax benefits within next twelve months of the reporting date. U.S. federal, state and foreign tax returns remain open to examination for the year ended September 30, 2014 and forward

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Share Based Compensation

6 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share Based Compensation

Share-Based Compensation

In connection with the IPO, the Board adopted and the Company's stockholders approved the Evoqua Water Technologies Corp. 2017 Equity Incentive Plan (or the Equity Incentive Plan), under which equity awards may be made in the respect of 5,100 shares of common stock of the Company. Under the Equity Incentive Plan, awards may be granted in the form of options, restricted stock, restricted stock units, stock appreciation rights, dividend equivalent rights, share awards and performance-based awards (including performance share units and performance-based restricted stock).

Share-based compensation expense was $554 and $4,250 during the three months ended March 31, 2017 and 2018, and $1,020 and $6,862 during the six months ended March 31, 2017 and 2018, respectively. The unrecognized compensation expense related to stock options and restricted stock units was $3,073 and $20,230, respectively at March 31, 2018, and is expected to be recognized over a weighted average period of 3.8 years and 1.6 years, respectively. No cash was received from the exercise of stock options during the three months ended March 31, 2018, as such activity was part of a cashless net exercise.

Option awards vest rateably at 25% per year, and are exercisable at the time of vesting. The options granted have a ten-year contractual term.

    A summary of the stock option activity as of March 31, 2018 is presented below (amounts in thousands except per share amounts):

	Options		Weighted Average Exercise Price/Share		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2017	9,060		$	5.18	7.5 years	$	11,011
Granted	34		24.25
Exercised	(1,018	)	4.74
Forfeited	(87	)	7.65
Expired	—		—
Outstanding at March 31, 2018	7,989		5.29		7.9 years	$	10,045
Options exercisable at March 31, 2018	5,516		$	4.87	6.5 years	$	5,569

The total intrinsic value of options exercised (which is the amount by which the stock price exceeded the exercise price of the options on the date of exercise) during the six months ended March 31, 2018 was $18,988.

A summary of the status of the Company's non-vested stock options as of and for the six month period ended March 31, 2018 is presented below.

	Shares		Weighted Average Grant Date Fair Value/Share
Nonvested at September 30, 2017	4,300		$	1.36
Granted	34
Vested	(1,774	)	1.07
Forfeited	(87	)	2.00
Nonvested at March 31, 2018	2,473		$	1.59

The total fair value of options vested during the six months ended March 31, 2018, was $1,670.

Restricted Stock Units

In addition to the establishment of the Equity Incentive Plan, in connection with the IPO, the Company entered into restricted stock unit (“RSU”) agreements with each of the executive officers and certain other key members of management. Pursuant to the RSU agreements, recipients received, in the aggregate, 1,197 stock-settled RSUs, the aggregate value of which equals $25,000. The RSUs will vest and settle in full upon the second anniversary of the IPO (the “Vesting Date”).

The following is a summary of the RSU activity for the six months endedMarch 31, 2018.

	Shares		Weighted Average Grant Date Fair Value/Share
Outstanding at September 30, 2017	—		$	—
Granted	1,201		20.89
Forfeited	(4	)	20.88
Outstanding at March 31, 2018	1,197		$	20.89

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Concentration of Credit Risk

6 Months Ended

Mar. 31, 2018

Risks and Uncertainties [Abstract]

Concentration of credit risk

Concentration of Credit Risk

The Company’s cash and cash equivalents and accounts receivable are potentially subject to concentration of credit risk. Cash and cash equivalents are placed with financial institutions that management believes are of high credit quality. Accounts receivable are derived from revenue earned from customers located in the U.S. and internationally and generally do not require collateral. The Company’s trade receivables do not represent a significant concentration of credit risk at September 30, 2017 and March 31, 2018 due to the wide variety of customers and markets into which products are sold and their dispersion across geographic areas. The Company does perform ongoing credit evaluations of its customers and maintains an allowance for potential credit losses on trade receivables. As of and for the three and six months endedMarch 31, 2017 and 2018, no customer accounted for more than 10% of net sales or net accounts receivable.

The Company operates predominantly in seven countries worldwide and provides a wide range of proven product brands and advanced water and wastewater treatment technologies, mobile and emergency water supply solutions and service contract options through its Industrial, Municipal, and Products segments. The Company is a multi-national business but its sales and operations are primarily in the U.S. Sales to unaffiliated customers are based on the Company locations that maintain the customer relationship and transacts the external sale.

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Related‑Party Transactions

6 Months Ended

Mar. 31, 2018

Related Party Transactions [Abstract]

Related‑Party Transactions

Related‑Party Transactions

Transactions with Investors

The Company paid an advisory fee of $1,000 per quarter to AEA Investors LP (AEA), the private equity firm and ultimate majority shareholder. Upon the IPO, the Company stopped paying these fees to AEA and as a result, only paid $333 during the three and six months endedMarch 31, 2018. In addition, the Company reimbursed AEA for normal and customary expenses incurred by AEA on behalf of the Company. The Company incurred expenses, excluding advisory fees, of $57 and $43 in the six months ended March 31, 2017 and 2018, respectively. The amounts owed to AEA were $38 and $0 at September 30, 2017 and March 31, 2018, respectively, and were included in Accrued expenses and other liabilities.

AEA, through two of its affiliated funds, is one of the lenders in the First Lien Term Loan Facility and had a commitment of $16,218 and $14,337 at September 30, 2017 and March 31, 2018, respectively.

The Company also has a related party relationship with one of its customers, who is also a shareholder of the Company. The Company had sales to this customer of $1,389 and $289 during the three months ended March 31, 2017 and 2018, and $1,564 and $585 during the six months ended March 31, 2017 and 2018, respectively, and was owed $2,354 and $1,063 from them at September 30, 2017 and March 31, 2018, respectively.

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Commitments and Contingencies

6 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Operating Leases

The Company occupies certain facilities and operates certain equipment and vehicles under non‑cancelable lease arrangements. Lease agreements may contain lease escalation clauses and purchase and renewal options. The Company recognizes scheduled lease escalation clauses over the course of the applicable lease term on a straight-line basis in the Consolidated Statement of Operations.

Total rent expense was $4,360 and $4,817 for the three months ended March 31, 2017 and 2018, respectively, and $8,833 and $9,754 for the six months endedMarch 31, 2017 and 2018, respectively.

Future minimum aggregate rental payments under non-cancelable operating leases are as follows:

	Operating Leases
Fiscal Year
Remainder of 2018	$	5,497
2019	9,920
2020	8,456
2021	6,459
2022	4,121
Thereafter	10,275
Total	$	44,728

Capital Leases

The gross and net carrying values of the equipment under capital leases was $43,727 and $30,302, respectively, as of September 30, 2017 and was $48,146 and $30,613, respectively, as of March 31, 2018 and are recorded in Property, plant and equipment, net.

The following is a schedule showing the future minimum lease payments under capital leases by years and the present value of the minimum lease payments as of March 31, 2018.

	Capital Leases
Fiscal Year
Remainder of 2018	$	5,278
2019	9,757
2020	8,166
2021	5,082
2022	3,194
Thereafter	1,860
Total	33,337
Less amount representing interest (at rates ranging from 2.15% to 3.65%)	2,196
Present value of net minimum capital lease payments	31,141
Less current installments of obligations under capital leases	10,728
Obligations under capital leases, excluding current installments	$	20,413

The current installments of obligations under capital leases are included in Accrued expenses and other liabilities. Obligations under capital leases, excluding current installments, are included in other non-current liabilities.

The Company is a lessor to multiple parties. The Company purchases equipment through internal funding or bank debt equal to the fair market value of the equipment. The equipment is then leased to customers for periods ranging from five to twenty years. As of March 31, 2018, future minimum lease payments receivable under operating leases are as follows:

	Operating Leases
Fiscal year
Remainder of 2018	$	3,147
2019	6,107
2020	7,257
2021	5,547
2022	5,395
Thereafter	63,356
Future minimum lease payments	$	90,809

Guarantees

From time to time, the Company is required to provide letters of credit, bank guarantees, or surety bonds in support of its commitments and as part of the terms and conditions on water treatment projects.  In addition, the Company is required to provide letters of credit or surety bonds to the department of environmental protection or equivalent in some states in order to maintain its licenses to handle toxic substances at certain of its water treatment facilities.

These financial instruments typically expire after all Company commitments have been met, a period typically ranging from twelve months to ten years, or more in some circumstances.  The letters of credit, bank guarantees, or surety bonds are arranged through major banks or insurance companies. In the case of surety bonds, the Company generally indemnifies the issuer for all costs incurred if a claim is made against the bond. 

As of September 30, 2017 and March 31, 2018 and the Company had letters of credit totaling $17,274 and $20,663, respectively, and surety bonds totaling $87,849 and $98,820, respectively, outstanding under the Company’s credit arrangements.  The longest maturity date of the letters of credit and surety bonds in effect as of March 31, 2018 was March 31, 2024. Additionally, as of September 30, 2017 and March 31, 2018, the Company had letters of credit totaling $901 and $922, respectively, and surety bonds totaling $12,970 and $5,570, respectively, outstanding under the Company’s prior arrangement with Siemens.

Litigation

From time to time, the Company is subject to various claims, charges and litigation matters that arise in the ordinary course of business. The Company believes these actions are a normal incident of the nature and kind of business in which the Company is engaged. While it is not feasible to predict the outcome of these matters with certainty, the Company does not believe that any asserted or unasserted legal claims or proceedings, individually or in the aggregate, will have a material adverse effect on its business, financial condition, results of operations or prospects.

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Accrued Expenses and Other Liabilities

6 Months Ended

Mar. 31, 2018

Payables and Accruals [Abstract]

Accrued Expenses and Other Liabilities

Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consisted of the following:

	September 30, 2017		March 31, 2018
Salaries, wages and other benefits	$	52,116	$	30,287
Severance payments	3,542		451
Taxes, other than income	9,244		10,289
Obligations under capital leases	9,777		10,728
Third party commissions	6,968		4,810
Insurance liabilities	4,915		5,640
Provisions for litigation	4,715		1,117
Earn outs related to acquisitions	4,304		4,765
Other	26,342		23,911
	$	121,923	$	91,998

The reduction in Accrued Expenses and Other Liabilities is primarily due to timing of cash payments for various employee-related liabilities, along with the payment of accrued expenses related to the IPO during the six months ended March 31, 2018.

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Business Segments

6 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Business segments

Business Segments

The Company has three reportable segments – Industrial, Municipal and Products. The key factors used to identify these reportable segments are the organization and alignment of the Company’s internal operations, the nature of the products and services, and customer type. The business segments are described as follows:

Industrial combines equipment and services to improve operational reliability and environmental compliance for heavy and light industry, commercial and institutional markets. Their customers span industries including hydrocarbon refineries, chemical processing, power, food and beverage, life sciences, health services and microelectronics.

Municipal helps engineers and municipalities meet new demands for plant performance through leading equipment, solutions and services backed by trusted brands and over 100 plus years of applications experience. Their customers include waste water and drinking water collection and distribution systems, utility operators. Their services include odor control services.

Products has distinct business operating units. Each has a unique standard product built on well-known brands and technologies that are sold globally through multiple sales and aftermarket channels. Additionally, Products also offers industrial, municipal and water recreational users with well-known brands that improve operational reliability and environmental compliance. Their customers include original equipment manufacturers, regional and global distributors, engineering, procurement and contracting customers, and end users in the municipal, industrial and commercial industries, including hotels, resorts, colleges, universities, waterparks, aquariums and zoos.

The Company evaluates its business segments’ operating results based on earnings before interest, taxes, depreciation and amortization. Corporate activities include general corporate expenses, elimination of intersegment transactions, interest income and expense and other unallocated charges. Unallocated charges include certain restructuring and other business transformation charges that have been undertaken to align and reposition the Company to the current reporting structure, acquisition related costs (including transaction costs, certain integration costs and recognition of backlog intangible assets recorded in purchase accounting) and stock-based compensation charges.

Since certain administrative and other operating expenses and other items have not been allocated to business segments, the results in the below table are not necessarily a measure computed in accordance with generally accepted accounting principles and may not be comparable to other companies.

	Three Months Ended March 31,						Six Months Ended March 31,
	2017			2018			2017			2018
Total sales
Industrial	$	161,505		$	183,949		$	308,510		$	352,217
Municipal	68,694			73,498			138,080			142,811
Products	87,939			98,237			166,906			180,007
Total sales	318,138			355,684			613,496			675,035
Intersegment sales
Industrial	1,048			2,690			2,347			5,764
Municipal	5,140			9,214			11,895			16,621
Products	12,048			10,091			19,480			21,909
Total intersegment sales	18,236			21,995			33,722			44,294
Sales to external customers
Industrial	160,457			181,259			306,163			346,453
Municipal	63,554			64,284			126,185			126,190
Products	75,890			88,147			147,425			158,097
Total sales	299,901			333,690			579,773			630,740
Earnings before interest, taxes, depreciation and amortization (EBITDA)
Industrial	35,373			41,713			67,374			81,840
Municipal	8,526			9,758			17,088			16,350
Products	16,956			22,972			31,855			33,646
Corporate	(30,001		)	(28,155		)	(72,358		)	(55,838		)
Total EBITDA	30,854			46,288			43,959			75,998
Depreciation and amortization
Industrial	9,528			10,709			18,440			20,854
Municipal	2,050			1,777			4,125			3,577
Products	3,105			3,087			6,639			6,076
Corporate	4,190			4,907			8,316			9,856
Total depreciation and amortization	18,873			20,480			37,520			40,363
Income (loss) from operations
Industrial	25,845			31,004			48,934			60,986
Municipal	6,476			7,981			12,963			12,773
Products	13,851			19,885			25,216			27,570
Corporate	(34,191		)	(33,062		)	(80,674		)	(65,694		)
Total income from operations	11,981			25,808			6,439			35,635
Interest expense	(11,898		)	(10,810		)	(26,651		)	(28,053		)
Income (loss) before income taxes	83			14,998			(20,212		)	7,582
Income tax benefit (expense)	4,812			(2,018		)	11,907			2,393
Net income (loss)	$	4,895		$	12,980		$	(8,305	)	$	9,975
Capital expenditures
Industrial	$	10,765		$	11,554		$	21,764		$	20,502
Products	1,596			1,139			2,581			2,321
Municipal	838			1,225			1,434			2,972
Corporate	367			2,495			1,450			5,875
Total capital expenditures	$	13,566		$	16,413		$	27,229		$	31,670

	September 30, 2017		March 31, 2018
Assets
Industrial	$	461,471	$	480,435
Municipal	155,698		139,195
Products	513,941		535,792
Corporate	342,199		344,437
Total assets	$	1,473,309	$	1,499,859
Goodwill
Industrial	$	128,190	$	130,186
Municipal	9,865		9,961
Products	183,858		189,751
Total goodwill	$	321,913	$	329,898

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Earnings per share

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings per share

Earnings Per Share

The following table sets forth the computation of basic and diluted loss from continuing operations per common share (in thousands, except per share amounts):

	Three Months Ended March 31,				Six Months Ended March 31,
	2017		2018		2017			2018
Numerator:
Numerator for basic and diluted loss per common share—Net (loss) income attributable to Evoqua Water Technologies	$	3,198	$	12,503	$	(10,401	)	$	8,790
Denominator:
Denominator for basic net (loss) income per common share—weighted average shares	104,632		113,770		104,632			113,770
Effect of dilutive securities:
Share‑based compensation	3,109		5,445		—			5,773
Denominator for diluted net loss per common share—adjusted weighted average shares	107,741		119,215		104,632			119,543
Basic (loss) income attributable to Evoqua Water Technologies per common share	$	0.03	$	0.11	$	(0.10	)	$	0.08
Diluted (loss) income attributable to Evoqua Water Technologies per common share	$	0.03	$	0.10	$	(0.10	)	$	0.07

Since the Company was in a net loss position for the six months ended March 31, 2017, there was no difference between the number of shares used to calculate basic and diluted loss per share. Because of their anti-dilutive effect, 8,901 common share equivalents, comprised of employee stock options, have been excluded from the diluted EPS calculation for the six months ended March 31, 2017.

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Subsequent Events

6 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

On April 2, 2018, the Company granted 1,325 options to certain employees of the Company and 19 restricted stock units to certain non-employee directors of the Company.

On April 9, 2018, WTG Holdings Coöperatief U.A., a wholly-owned subsidiary of the Company, completed the sale of 100% of the corporate capital of Evoqua Water Technologies S.r.l., which includes the Company’s former operations in Italy, to Giotto Water S.r.l. The aggregate purchase price paid in cash by Giotto in the transaction was €350,000, subject to certain earn out adjustments to be paid by Giotto in connection with the realization of specified tax benefits relating to previous years.

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Description of the Company and Basis of Presentation - (Policies)

6 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of presentation

Basis of Presentation

The accompanying Unaudited Condensed Consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP). All intracompany transactions have been eliminated.

The unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such SEC rules. We believe that the disclosures made are adequate to make the information presented not misleading. We consistently applied the accounting policies described in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017, as filed with the SEC on December 4, 2017 (2017 Annual Report), in preparing these unaudited condensed consolidated financial statements, with the exception of accounting standard updates described in Note 2. These condensed consolidated financial statements should be read in conjunction with the audited financial statements and the notes included in our 2017 Annual Report.

Fiscal Year

Fiscal Year

The Company’s fiscal year ends on September 30.

Use of estimates

Use of Estimates

The unaudited condensed consolidated financial statements have been prepared in conformity with U.S. GAAP and require management to make estimates and assumptions. These assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Estimates and assumptions are used for, but not limited to: (i) revenue recognition; (ii) allowance for doubtful accounts; (iii) inventory valuation, asset valuations, impairment, and recoverability assessments; (iv) depreciable lives of assets; (v) useful lives of intangible assets; (vi) income tax reserves and valuation allowances; and (vii) product warranty and litigation reserves. Estimates are revised as additional information becomes available. Actual results could differ from these estimates.

Cash and cash equivalents

Cash and Cash Equivalents

Cash and cash equivalents are liquid investments with an original maturity of three or fewer months when purchased.

Accounts receivable

Accounts Receivable

Receivables are primarily comprised of uncollected amounts owed to us from transactions with customers and are presented net of allowances for doubtful accounts. Allowances are estimated based on historical write‑offs and the economic status of customers. The Company considers a receivable delinquent if it is unpaid after the term of the related invoice has expired. Write‑offs are recorded at the time all collection efforts have been exhausted.

Inventories

Inventories

Inventories are stated at the lower of cost or market, where cost is generally determined on the basis of an average or first‑in, first‑out (FIFO) method. Production costs comprise direct material and labor and applicable manufacturing overheads, including depreciation charges. The Company regularly reviews inventory quantities on hand and writes off excess or obsolete inventory based on estimated forecasts of product demand and production requirements. Manufacturing operations recognize cost of product sales using standard costing rates with overhead absorption which generally approximates actual cost.

Property, plant and equipment

Property, Plant, and Equipment

Property, plant, and equipment is valued at cost less accumulated depreciation and impairment losses. If the costs of certain components of an item of property, plant, and equipment are significant in relation to the total cost of the item, they are accounted for and depreciated separately. Depreciation expense is recognized using the straight‑line method. Useful lives are reviewed annually and, if expectations differ from previous estimates, adjusted accordingly. Estimated useful lives for major classes of depreciable assets are as follows:

Asset Class	Estimated Useful Life
Machinery and equipment	3 to 20 years
Buildings and improvements	10 to 40 years

Leasehold improvements are depreciated over the shorter of their estimated useful life or the term of the lease. Costs related to maintenance and repairs that do not extend the assets’ useful life are expensed as incurred.

Goodwill and other intangible assets

Goodwill and Other Intangible Assets

Goodwill represents purchase consideration paid in a business combination that exceeds the value assigned to the net assets of acquired businesses. Other intangible assets consist of customer‑related intangibles, proprietary technology, software, trademarks and other intangible assets. The Company amortizes intangible assets with definite useful lives on a straight‑line basis over their respective estimated economic lives which range from 1 to 26 years.

The Company reviews goodwill to determine potential impairment annually during the fourth quarter of our fiscal year, or more frequently if events and circumstances indicate that the asset might be impaired. Impairment testing for goodwill is performed at a reporting unit level. We have determined that we have four reporting units. Our quantitative impairment testing utilizes both a market (guideline public company) and income (discounted cash flows) method for determining fair value. In estimating the fair value of the reporting unit utilizing a discounted cash flow (“DCF”) valuation technique, we incorporate our judgment and estimates of future cash flows, future revenue and gross profit growth rates, terminal value amount, capital expenditures and applicable weighted‑average cost of capital used to discount these estimated cash flows. The estimates and projections used in the estimate of fair value are consistent with our current budget and long‑range plans, including anticipated change in market conditions, industry trend, growth rates and planned capital expenditures, among other considerations.

Impairment of long-lived assets

Impairment of Long‑Lived Assets

Long‑lived assets, such as property, plant, and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Recoverability of the asset or asset group is measured by comparison of its carrying amount to undiscounted future net cash flows the asset or asset group is expected to generate. If the carrying amount of an asset or asset group is not recoverable, the Company recognizes an impairment loss based on the excess of the carrying amount of the asset or asset group over its respective fair value which is generally determined as the present value of estimated future cash flows or as the appraised value.

Debt Issuance Costs And Debt Discounts

Debt Issuance Costs and Debt Discounts

Debt issuance costs are capitalized and amortized over the contractual term of the underlying debt using the straight line method which approximates the effective interest method. Debt discounts and lender arrangement fees deducted from the proceeds have been included as a component of the carrying value of debt and are being amortized to interest expense using the effective interest method.

Revenue Recognition

Revenue Recognition

Sales of goods and services are recognized when persuasive evidence of an arrangement exists, the price is fixed or determinable, collectability is reasonably assured and delivery has occurred or services have been rendered.

For sales of aftermarket parts or products with a low level of customization and engineering time, the Company recognizes revenues at the time risks and rewards of ownership pass, which is generally when products are shipped or delivered to the customer as the Company has no obligation for installation. Sales of short‑term service arrangements are recognized as the services are performed, and sales of long‑term service arrangements are typically recognized on a straight‑line basis over the life of the agreement.

For certain arrangements where there is significant customization to the product, the Company recognizes revenue under the provisions of Accounting Standards Codification (ASC) 605-35, Revenue Recognition – Construction-Type and Production-Type Contracts. These products include large capital water treatment projects, systems and solutions for municipal and industrial applications. Revenues from construction-type contracts are generally recognized under the percentage-of-completion method, based on the input of costs incurred to date as a percentage of total estimated contract costs. The nature of the contracts is generally fixed price with milestone billings. Approximately $57,818 and $70,520 of revenues from construction-type contracts were recognized on the percentage-of-completion method during the three months ended March 31, 2017 and 2018, respectively and $104,881 and $129,907 for the six months ended March 31, 2017 and 2018, respectively. Contract revenues and cost estimates are reviewed and revised quarterly at a minimum and the cumulative effect of such adjustments are recognized in current operations. The amount of such adjustments have not been material. Cost and earnings in excess of billings under construction‑type arrangements are recorded when contracts have net asset balances where contract costs plus recognized profits less recognized losses exceed progress billings. Billings in excess of costs incurred are recorded when contract progress billings exceed costs and recognized profit less recognized losses. Approximately $5,674 and $6,817 of revenues from construction-type contracts were recognized on a completed contract method, which is typically when the product is delivered and accepted by the customer, during the three months ended March 31, 2017 and 2018, respectively and $14,466 and $13,200 for the six months ended March 31, 2017 and 2018, respectively. The completed contract method is principally used when the contract is short in duration (generally less than twelve months) and where results of operations would not vary materially from those resulting from the use of the percentage-of-completion method.

Product warranties

Product Warranties

Accruals for estimated expenses related to warranties are made at the time products are sold and are recorded as a component of Cost of product sales in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss. The estimated warranty obligation is based on product warranty terms offered to customers, ongoing product failure rates, material usage and service delivery costs expected to be incurred in correcting a product failure, as well as specific obligations for known failures and other currently available evidence. The Company assesses the adequacy of the recorded warranty liabilities on a regular basis and adjusts amounts as necessary.

Shipping and handling cost

Shipping and Handling Cost

Shipping and handling costs are included as a component of cost of sales

Income Taxes

Income Taxes

The Company recognizes deferred tax assets and liabilities for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that included the enactment date. Valuation allowances are provided against deferred tax assets when it is deemed more likely than not that some portion or all of the deferred tax asset will not be realized within a reasonable time period. We assess tax positions using a two‑step process. A tax position is recognized if it meets a more‑likely‑than‑not threshold, and is measured at the largest amount of benefit that is greater than 50.0% percent of being realized. Uncertain tax positions are reviewed each balance sheet date.

Sales Taxes

Sales Taxes

Upon collection of sales tax from revenue, the amount of sales tax is placed into an accrued liability account. This liability is then relieved when the payment is sent to the proper government jurisdiction.

Foreign currency translations and transactions

Foreign Currency Translation and Transactions

The functional currency for the international subsidiaries is the local currency. Assets and liabilities are translated into U.S. Dollars using current rates of exchange, while revenues and expenses are translated at the weighted‑average exchange rate for the period. The resulting translation adjustments are recorded in other comprehensive income/loss within shareholders equity.

Research and Development Costs

Research and Development Costs

Research and development costs are expensed as incurred.

Equity-based compensation

Equity‑based Compensation

The Company measures the cost of awards of equity instruments to employees based on the grant‑date fair value of the award. Prior to the IPO, given the absence of a public trading market for our common stock, the fair value of the common stock underlying our share‑based awards was determined by our board, with input from management, in each case using the income and market valuation approach. Stock options are granted with exercise prices equal to or greater than the estimated fair market value on the date of grant as authorized by our compensation committee. The grant‑date fair value is determined using the Black‑Scholes model. The fair value, net of estimated forfeitures, is amortized as compensation cost on a straight‑line basis over the vesting period primarily as a component of General and administrative expenses.

Earnings per share

Earnings per Share

Basic earnings per common share is computed based on the weighted average number of shares of common stock outstanding during the period. Diluted earnings per common share is computed based on the weighted average number of shares of common stock, plus the effect of diluted potential common shares outstanding during the period using the treasury stock method. Diluted potential common shares include outstanding stock options.

Retirement benefits

Retirement Benefits

The Company applies, ASC Topic 715, Compensation—Retirement Benefits, which requires the recognition in pension obligations and accumulated other comprehensive income of actuarial gains or losses, prior service costs or credits and transition assets or obligations that have previously been deferred. The determination of retirement benefit pension obligations and associated costs requires the use of actuarial computations to estimate participant plan benefits to which the employees will be entitled. The significant assumptions primarily relate to discount rates, expected long‑term rates of return on plan assets, rate of future compensation increases, mortality, years of service, and other factors. The Company develops each assumption using relevant experience in conjunction with market‑related data for each individual country in which such plans exist. All actuarial assumptions are reviewed annually with third‑party consultants and adjusted as necessary. For the recognition of net periodic postretirement cost, the calculation of the expected return on plan assets is generally derived by applying the expected long‑term rate of return on the market‑related value of plan assets. The fair value of plan assets is determined based on actual market prices or estimated fair value at the measurement date.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Accounting Pronouncements Not Yet Adopted

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09,Revenue from Contracts with Customers (Topic 606). ASU No. 2014-09 clarifies the principles for recognizing revenue when an entity either enters into a contract with customers to transfer goods or services or enters into a contract for the transfer of non-financial assets. ASU 2014-09 may be adopted using either of two acceptable methods: (1) retrospective adoption to each prior period presented with the option to elect certain practical expedients;or (2) adoption with the cumulative effect recognized at the date of initial application and providing certain disclosures. To assess at which time revenue should be recognized, an entity should use the following steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the entity satisfies a performance obligation. The standard is effective for the Company for the quarter ending December 31, 2018. The Company has completed its first phase of adopting this standard, which was to identify the potential differences that will result from applying the new revenue recognition standard to the Company's contracts with its customers, and has begun the second step of reviewing its contracts to determine the impact of adopting the standard. The Company has completed its preliminary assessment of the impact of the new standard compared to the historical accounting policies on a representative sample of contracts.  The Company does not anticipate a material change to result from the adoption of the new standard related to its product sales.  The Company recognizes revenue for some of its contracts on a percentage of completion basis, which represented approximately 20% of its consolidated net sales for the six months endedMarch 31, 2018.  The Company expects that for some of these contracts, the new guidance will instead require revenue to be recognized at a point in time.   The Company is continuing to assess the ultimate impact that the adoption of this standard will have on its consolidated financial statements and related disclosures.  In addition, the Company is evaluating the changes that will be required in its internal controls as a result of the adoption of this new standard.  The Company is planning to adopt the provisions of the ASU and its subsequent amendments using the modified retrospective transition method for existing transactions that will likely result in a cumulative effect adjustment as of October 1, 2018.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). ASU No. 2016-02 requires recognition of operating leases as lease assets and liabilities on the balance sheet, and disclosure of key information about leasing arrangements. ASU No. 2016-02 will be effective retrospectively for the Company for the quarter ending December 31, 2019, with early adoption permitted. The Company is currently reviewing its leasing arrangements in order to evaluate the impact of this standard will have on the Company's Consolidated financial statements.

In August 2016, the FASB issued ASU 2016‑15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force). This new guidance is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. ASU No. 2016‑15 will be effective for the Company for the quarter ending December 31, 2018, with early adoption permitted. The guidance should be applied retrospectively to all periods presented, unless deem impracticable, in which case prospective application is permitted. The Company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

In October 2016, the FASB issued ASU 2016-17, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. The purpose of this update is to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. The ASU requires the tax effects of all intra-entity sales of assets other than inventory to be recognized in the period in which the transaction occurs. The guidance will be effective for the Company for the quarter ending December 31, 2018 with early adoption permitted but only in the first interim period of a fiscal year. The changes are required to be applied by means of a cumulative-effect adjustment recorded in retained earnings as of the beginning of the fiscal year of adoption.  The Company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

In February 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires the disaggregation of the service cost component from other components of net periodic benefit cost, clarifies how to present the service cost component and other components of net benefit costs in the Statements of Consolidated Operations and allows only the service cost component of net benefit costs to be eligible for capitalization. This ASU is effective for the Company for the quarter ending December 31, 2018. Adoption will be applied on a retrospective basis for the presentation of all components of net periodic benefit costs and on a prospective basis for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The company is currently evaluating the impact this guidance will have on the Consolidated financial statements and related disclosures.

In May 2017, the FASB issued ASU 2017‑09, Scope of Modification Accounting, which amended Accounting Standards Code Topic 718. FASB issued ASU 2017‑09 to reduce the cost and complexity when applying Topic 718 and standardize the practice of applying Topic 718 to financial reporting. The ASU was not developed to fundamentally change the definition of a modification, but instead to provide guidance for what changes would qualify as a modification. ASU No. 2017‑09 will be effective for us for the quarter ending December 31, 2018. The company is currently evaluating the potential impact of adoption on the Company’s Consolidated financial statements.

Accounting Pronouncements Recently Adopted

The Company adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends ASC Topic 718, Compensation – Stock Compensation as of October 1, 2017. The ASU includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. The adoption of this ASU did not have a significant impact on the Company's Consolidated financial statements.

In January 2017, the FASB issued ASU 2017‑04, Simplifying the Test for Goodwill Impairment. This ASU simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures goodwill impairment loss by comparing the implied value of a reporting unit’s goodwill with the carrying amount of that goodwill. The amendments in this ASU are effective for the Company for the quarter ending December 31, 2020. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. ASU 2017-04 was early adopted by the Company for the year beginning October 1, 2017 and did not have a material impact on the Company's Consolidated financial statements.

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Schedule Of Estimated Useful Lives For Major Classes Of Depreciable Assets

Estimated useful lives for major classes of depreciable assets are as follows:

Asset Class	Estimated Useful Life
Machinery and equipment	3 to 20 years
Buildings and improvements	10 to 40 years

Property, plant, and equipment consists of the following:

	September 30, 2017			March 31, 2018
Machinery and equipment	$	338,056		$	356,277
Land and buildings	84,282			85,786
Construction in process	24,788			35,446
	447,126			477,509
Less: accumulated depreciation	(167,083		)	(191,822		)
	$	280,043		$	285,687

Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net

	September 30, 2017			March 31, 2018
Current assets (including cash of $1,907 and $3,033)	$	12,006		$	8,043
Property, plant and equipment	6,107			5,704
Goodwill	2,206			2,206
Other non-current assets	2,735			—
Total liabilities	(12,781		)	(6,509		)
	Three Months Ended March 31,
	2017			2018
Total revenues	$	4,004		$	3,577
Total operating expenses	(3,485		)	(2,622		)
Income from operations	$	519		$	955
	Six Months Ended March 31,
	2017			2018
Total revenues	$	8,075		$	9,566
Total operating expenses	(5,768		)	(7,196		)
Income from operations	$	2,307		$	2,370

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Acquisitions and Divestitures (Tables)

6 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The preliminary opening balance sheet for the acquisitions is summarized as follows.

	Pure Water			Pacific Ozone			Total
Current assets	$	277		$	1,418		$	1,695
Property, plant and equipment	175			192			367
Goodwill	2,369			5,863			8,232
Intangible assets	1,488			—			1,488
Total assets acquired	4,309			7,473			11,782
Total liabilities assumed	(154		)	(916		)	(1,070		)
Net assets acquired	$	4,155		$	6,557		$	10,712

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Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table presents the Company’s financial assets and liabilities at fair value. The fair values related to the pension plan assets are determined using net asset value (NAV) as a practical expedient, or by information categorized in the fair value hierarchy level based on the inputs used to determine fair value. The reported carrying amounts of deferred compensation plan assets and liabilities and debt approximate their fair values. The Company uses interest rates and other relevant information generated by market transactions involving similar instruments to fair value these assets and liabilities, therefore all are classified as Level 2 within the valuation hierarchy.

	Net Asset Value		Quoted Market Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
As of September 30, 2017
Assets:
Pension plan
Cash	$	—	$	16,024	$	—		$	—
Government Securities	3,206		—		—			—
Liability Driven Investment	2,754		—		—			—
Guernsey Unit Trust	932		—		—			—
Global Absolute Return	2,139		—		—			—
Deferred compensation plan assets
Trust Assets	—		2,146		—			—
Insurance	—		—		17,396			—
Liabilities:
Pension plan	—		—		(34,803		)	—
Deferred compensation plan liabilities	—		—		(21,159		)	—
Long‑term debt	—		—		(912,471		)	—
As of March 31, 2018
Assets:
Pension plan
Cash	$	—	$	16,559	$	—		$	—
Government Securities	3,229		—		—			—
Liability Driven Investment	3,490		—		—			—
Guernsey Unit Trust	999		—		—			—
Global Absolute Return	2,235		—		—			—
Deferred compensation plan assets
Trust Assets	—		947		—			—
Insurance	—		—		17,905			—
Liabilities:
Pension plan	—		—		(34,803		)	—
Deferred compensation plan liabilities	—		—		(20,945		)	—
Long‑term debt	—		—		(806,361		)	—

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Accounts Receivable (Tables)

6 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Schedule of accounts receivable

Accounts receivable are summarized as follows:

	September 30, 2017			March 31, 2018
Accounts Receivable	$	248,742		$	222,075
Allowance for Doubtful Accounts	(3,494		)	(4,223		)
Receivables, net	$	245,248		$	217,852

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Inventories (Tables)

6 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

The major classes of inventory, net are as follows:

	September 30, 2017			March 31, 2018
Raw materials and supplies	$	64,113		$	68,350
Work in progress	16,425			21,350
Finished goods and products held for resale	44,402			52,222
Costs of unbilled projects	5,706			5,407
Reserves for excess and obsolete	(10,599		)	(11,078		)
	$	120,047		$	136,251

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Property, Plant, and Equipment (Tables)

6 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Estimated useful lives for major classes of depreciable assets are as follows:

Asset Class	Estimated Useful Life
Machinery and equipment	3 to 20 years
Buildings and improvements	10 to 40 years

Property, plant, and equipment consists of the following:

	September 30, 2017			March 31, 2018
Machinery and equipment	$	338,056		$	356,277
Land and buildings	84,282			85,786
Construction in process	24,788			35,446
	447,126			477,509
Less: accumulated depreciation	(167,083		)	(191,822		)
	$	280,043		$	285,687

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Goodwill (Tables)

6 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of goodwill are as follows:

	Industrial			Municipal		Products			Total
Balance at September 30, 2017	$	128,190		$	9,865	$	183,858		$	321,913
Business combinations	2,369			—		5,863			8,232
Measurement period adjustment	—			—		(314		)	(314		)
Foreign currency translation	(373		)	96		344			67
Balance at March 31, 2018	$	130,186		$	9,961	$	189,751		$	329,898

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Debt (Tables)

6 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long‑term debt consists of the following:

	September 30, 2017			March 31, 2018
First Lien Term Loan Facility, due December 20, 2024	$	896,574		$	792,591
Revolving Credit Facility	—			—
Build Own Operate Financing, due June 30, 2024	6,930			6,423
Notes Payable, due June 30, 2018 to July 31, 2023	3,287			2,592
Total debt	906,791			801,606
Less unamortized discount and lender fees	(16,942		)	(14,565		)
Total net debt	889,849			787,041
Less current portion	(11,325		)	(11,057		)
Total long‑term debt	$	878,524		$	775,984

Schedule of Aggregate Maturities of Long-term Debt

Aggregate maturities of all long‑term debt, including current portion of long‑term debt and excluding capital lease obligations as of March 31, 2018, are presented below:

Fiscal Year
Remainder of 2018	$	4,978
2019	9,503
2020	9,402
2021	9,429
2022	9,459
Thereafter	758,835
Total	$	801,606

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Product Warranties (Tables)

6 Months Ended

Mar. 31, 2018

Guarantees and Product Warranties [Abstract]

Schedule of product warranty liability

A reconciliation of the activity related to the accrued warranty, including both the current and long‑term portions, is as follows:

	Six Months Ended March 31,
	2017		2018
Balance at beginning of the period	$	23,309	$	17,274
Warranty provision for sales	3,245		2,386
Settlement of warranty claims	(7,657)		(7,559)
Foreign currency translation and other	(413)		435
Balance at end of the period	$	18,484	$	12,536

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Restructuring and Related Charges (Tables)

6 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Schedule of restructuring components

The table below sets forth the amounts accrued for the restructuring components and related activity:

	Six Months Ended March 31,
	2017		2018
Balance at beginning of the period	$	13,217	$	3,542
Restructuring charges related to VSP	15,431		320
Charges related to other initiatives	3,295		5,964
Write off charge and other non‑cash activity	(374)		(308)
Cash payments	(24,325)		(9,095)
Other adjustments	(159)		28
Balance at end of the period	$	7,085	$	451

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Employee Benefit Plans (Tables)

6 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of net benefit costs

Pension expense for the German and UK plans were as follows:

	Three Months Ended March 31,
	2017		2018
Service cost	$	267	$	243
Interest cost	82		123
Expected return on plan assets	(40)		(32)
Amortization of actuarial losses	188		79
Pension expense for defined benefit plans	$	497	$	413
	Six Months Ended March 31,
	2017		2018
Service cost	$	518	$	475
Interest cost	159		241
Expected return on plan assets	(78)		(63)
Amortization of actuarial losses	364		155
Pension expense for defined benefit plans	$	963	$	808

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Share Based Compensation (Tables)

6 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock options, activity

A summary of the stock option activity as of March 31, 2018 is presented below (amounts in thousands except per share amounts):

	Options		Weighted Average Exercise Price/Share		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2017	9,060		$	5.18	7.5 years	$	11,011
Granted	34		24.25
Exercised	(1,018	)	4.74
Forfeited	(87	)	7.65
Expired	—		—
Outstanding at March 31, 2018	7,989		5.29		7.9 years	$	10,045
Options exercisable at March 31, 2018	5,516		$	4.87	6.5 years	$	5,569

Schedule of Nonvested Share Activity

A summary of the status of the Company's non-vested stock options as of and for the six month period ended March 31, 2018 is presented below.

	Shares		Weighted Average Grant Date Fair Value/Share
Nonvested at September 30, 2017	4,300		$	1.36
Granted	34
Vested	(1,774	)	1.07
Forfeited	(87	)	2.00
Nonvested at March 31, 2018	2,473		$	1.59

The total fair value of options vested during the six months ended March 31, 2018, was $1,670.

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following is a summary of the RSU activity for the six months endedMarch 31, 2018.

	Shares		Weighted Average Grant Date Fair Value/Share
Outstanding at September 30, 2017	—		$	—
Granted	1,201		20.89
Forfeited	(4	)	20.88
Outstanding at March 31, 2018	1,197		$	20.89

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Commitments and Contingencies (Tables)

6 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Aggregate Future Minimum Rental Payments for Operating Leases

Future minimum aggregate rental payments under non-cancelable operating leases are as follows:

	Operating Leases
Fiscal Year
Remainder of 2018	$	5,497
2019	9,920
2020	8,456
2021	6,459
2022	4,121
Thereafter	10,275
Total	$	44,728

Schedule of Future Minimum Lease Payments for Capital Leases

The following is a schedule showing the future minimum lease payments under capital leases by years and the present value of the minimum lease payments as of March 31, 2018.

	Capital Leases
Fiscal Year
Remainder of 2018	$	5,278
2019	9,757
2020	8,166
2021	5,082
2022	3,194
Thereafter	1,860
Total	33,337
Less amount representing interest (at rates ranging from 2.15% to 3.65%)	2,196
Present value of net minimum capital lease payments	31,141
Less current installments of obligations under capital leases	10,728
Obligations under capital leases, excluding current installments	$	20,413

Schedule of Future Minimum Lease Payments Receivable under Operating Leases

As of March 31, 2018, future minimum lease payments receivable under operating leases are as follows:

	Operating Leases
Fiscal year
Remainder of 2018	$	3,147
2019	6,107
2020	7,257
2021	5,547
2022	5,395
Thereafter	63,356
Future minimum lease payments	$	90,809

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Accrued Expenses and Other Liabilities (Tables)

6 Months Ended

Mar. 31, 2018

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities

Accrued expenses and other liabilities consisted of the following:

	September 30, 2017		March 31, 2018
Salaries, wages and other benefits	$	52,116	$	30,287
Severance payments	3,542		451
Taxes, other than income	9,244		10,289
Obligations under capital leases	9,777		10,728
Third party commissions	6,968		4,810
Insurance liabilities	4,915		5,640
Provisions for litigation	4,715		1,117
Earn outs related to acquisitions	4,304		4,765
Other	26,342		23,911
	$	121,923	$	91,998

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Business Segments (Tables)

6 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of segment reporting information, by segment

	Three Months Ended March 31,						Six Months Ended March 31,
	2017			2018			2017			2018
Total sales
Industrial	$	161,505		$	183,949		$	308,510		$	352,217
Municipal	68,694			73,498			138,080			142,811
Products	87,939			98,237			166,906			180,007
Total sales	318,138			355,684			613,496			675,035
Intersegment sales
Industrial	1,048			2,690			2,347			5,764
Municipal	5,140			9,214			11,895			16,621
Products	12,048			10,091			19,480			21,909
Total intersegment sales	18,236			21,995			33,722			44,294
Sales to external customers
Industrial	160,457			181,259			306,163			346,453
Municipal	63,554			64,284			126,185			126,190
Products	75,890			88,147			147,425			158,097
Total sales	299,901			333,690			579,773			630,740
Earnings before interest, taxes, depreciation and amortization (EBITDA)
Industrial	35,373			41,713			67,374			81,840
Municipal	8,526			9,758			17,088			16,350
Products	16,956			22,972			31,855			33,646
Corporate	(30,001		)	(28,155		)	(72,358		)	(55,838		)
Total EBITDA	30,854			46,288			43,959			75,998
Depreciation and amortization
Industrial	9,528			10,709			18,440			20,854
Municipal	2,050			1,777			4,125			3,577
Products	3,105			3,087			6,639			6,076
Corporate	4,190			4,907			8,316			9,856
Total depreciation and amortization	18,873			20,480			37,520			40,363
Income (loss) from operations
Industrial	25,845			31,004			48,934			60,986
Municipal	6,476			7,981			12,963			12,773
Products	13,851			19,885			25,216			27,570
Corporate	(34,191		)	(33,062		)	(80,674		)	(65,694		)
Total income from operations	11,981			25,808			6,439			35,635
Interest expense	(11,898		)	(10,810		)	(26,651		)	(28,053		)
Income (loss) before income taxes	83			14,998			(20,212		)	7,582
Income tax benefit (expense)	4,812			(2,018		)	11,907			2,393
Net income (loss)	$	4,895		$	12,980		$	(8,305	)	$	9,975
Capital expenditures
Industrial	$	10,765		$	11,554		$	21,764		$	20,502
Products	1,596			1,139			2,581			2,321
Municipal	838			1,225			1,434			2,972
Corporate	367			2,495			1,450			5,875
Total capital expenditures	$	13,566		$	16,413		$	27,229		$	31,670

	September 30, 2017		March 31, 2018
Assets
Industrial	$	461,471	$	480,435
Municipal	155,698		139,195
Products	513,941		535,792
Corporate	342,199		344,437
Total assets	$	1,473,309	$	1,499,859
Goodwill
Industrial	$	128,190	$	130,186
Municipal	9,865		9,961
Products	183,858		189,751
Total goodwill	$	321,913	$	329,898

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Earnings per share (Tables)

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

The following table sets forth the computation of basic and diluted loss from continuing operations per common share (in thousands, except per share amounts):

	Three Months Ended March 31,				Six Months Ended March 31,
	2017		2018		2017			2018
Numerator:
Numerator for basic and diluted loss per common share—Net (loss) income attributable to Evoqua Water Technologies	$	3,198	$	12,503	$	(10,401	)	$	8,790
Denominator:
Denominator for basic net (loss) income per common share—weighted average shares	104,632		113,770		104,632			113,770
Effect of dilutive securities:
Share‑based compensation	3,109		5,445		—			5,773
Denominator for diluted net loss per common share—adjusted weighted average shares	107,741		119,215		104,632			119,543
Basic (loss) income attributable to Evoqua Water Technologies per common share	$	0.03	$	0.11	$	(0.10	)	$	0.08
Diluted (loss) income attributable to Evoqua Water Technologies per common share	$	0.03	$	0.10	$	(0.10	)	$	0.07

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Description of the Company and Basis of Presentation (Details) $ / shares in Units, shares in Thousands, $ in Thousands				3 Months Ended	6 Months Ended
	Nov. 07, 2017 shares	Nov. 06, 2017 $ / shares shares	Jan. 16, 2014 USD ($)	Mar. 31, 2018 $ / shares	Mar. 31, 2018 USD ($) segment $ / shares	Sep. 30, 2017 $ / shares
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in USD per share) | $ / shares				$ 0.01	$ 0.01	$ 0.01
Repayments of debt | $					$ 104,936
Number of reportable segments				3	3
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)		27,777
Common stock, par value (in USD per share) | $ / shares		$ 0.01
Proceeds from issuance of common stock | $					$ 137,605
Initial Public Offering - Shares from Existing Shareholders [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)		8,333
Initial Public Offering - Shares from The Company [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)		19,444
Over-Allotment Option [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)	4,167
EWT Holdings II Corp and EWT Holdings III Corp [Member]
Subsidiary, Sale of Stock [Line Items]
Stock purchase price, net of cash received | $			$ 730,577

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Summary of Significant Accounting Policies (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Dec. 31, 2017	Nov. 30, 2017	Oct. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Oct. 28, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of debt issuance costs and discounts				$ 606	$ 1,003	$ 1,151	$ 2,501
Write off of deferred debt issuance cost	$ 1,150	$ 1,844	$ 2,075		2,075	2,944
Prepayment of debt		$ 100,000
Revenues, percentage of completion method				70,520	57,818	129,907	104,881
Revenues, completed contract method				6,817	5,674	13,200	14,466
Foreign currency losses (gains) on intracompany loans				2,305	2,036	3,688	(5,209)
Research and development costs				4,021	$ 5,086	$ 8,674	$ 10,091
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life						1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life						26 years
Machinery and equipment | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Property, plant and equipment, useful life						3 years
Machinery and equipment | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Property, plant and equipment, useful life						20 years
Building and Building Improvements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Property, plant and equipment, useful life						10 years
Building and Building Improvements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Property, plant and equipment, useful life						40 years
Restricted Stock Units (RSUs) [Member]
Finite-Lived Intangible Assets [Line Items]
Stock granted during period, employee stock ownership plan (shares)						1,201
Tack-On Financing Completed October 28, 2016 [Member]
Finite-Lived Intangible Assets [Line Items]
Debt instrument, fee amount								$ 481
December Refinancing [Member]
Finite-Lived Intangible Assets [Line Items]
Debt instrument, fee amount				$ 2,131		$ 2,131

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Summary of Significant Accounting Policies - Treated Water Outsourcing (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Subsidiary or Equity Method Investee [Line Items]
Current assets (including cash of $1,907 and $3,033)	$ 530,872		$ 530,872		$ 512,240
Cash	3,033		3,033		1,907
Property, plant and equipment	285,687		285,687		280,043
Goodwill	329,898		329,898		321,913
Other non-current assets	22,747		22,747		22,399
Total liabilities	(1,138,783)		(1,138,783)		(1,256,734)
Total revenues	333,690	$ 299,901	630,740	$ 579,773
Income from operations	46,288	30,854	75,998	43,959
Treated Water Outsourcing [Member]
Subsidiary or Equity Method Investee [Line Items]
Current assets (including cash of $1,907 and $3,033)	8,043		8,043		12,006
Property, plant and equipment	5,704		5,704		6,107
Goodwill	2,206		2,206		2,206
Other non-current assets	0		0		2,735
Total liabilities	(6,509)		(6,509)		$ (12,781)
Total revenues	3,577	4,004	9,566	8,075
Total operating expenses	(2,622)	(3,485)	(7,196)	(5,768)
Income from operations	$ 955	$ 519	$ 2,370	$ 2,307

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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Thousands			6 Months Ended
	Mar. 09, 2018	Jan. 31, 2018	Mar. 31, 2018
Pure Water Solutions [Member]
Business Acquisition [Line Items]
Consideration transferred, liabilities incurred		$ 4,699
Payments to acquire businesses, gross		3,706
Stock purchase price, net of cash received		$ 993
Accrued earnout related to acquisitions			$ 461
Pacific Ozone [Member]
Business Acquisition [Line Items]
Consideration transferred, liabilities incurred	$ 8,557
Payments to acquire businesses, gross	6,557
Stock purchase price, net of cash received	$ 2,000

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Acquisitions and Divestitures - Balance Sheet for Acquisitions (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Goodwill	$ 329,898	$ 321,913
Pure Water Solutions [Member]
Business Acquisition [Line Items]
Current assets	277
Property, plant and equipment	175
Goodwill	2,369
Intangible assets	1,488
Total assets acquired	4,309
Total liabilities assumed	(154)
Net assets acquired	4,155
Pacific Ozone [Member]
Business Acquisition [Line Items]
Current assets	1,418
Property, plant and equipment	192
Goodwill	5,863
Intangible assets	0
Total assets acquired	7,473
Total liabilities assumed	(916)
Net assets acquired	6,557
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Current assets	1,695
Property, plant and equipment	367
Goodwill	8,232
Intangible assets	1,488
Total assets acquired	11,782
Total liabilities assumed	(1,070)
Net assets acquired	$ 10,712

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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Quoted Market Prices in Active Markets (Level 1) [Member]
Deferred compensation plan assets
Trust Assets	$ 947	$ 2,146
Significant Other Observable Inputs (Level 2) [Member]
Deferred compensation plan assets
Insurance	17,905	17,396
Liabilities:
Pension plan	(34,803)	(34,803)
Deferred compensation plan liabilities	(20,945)	(21,159)
Long‑term debt	(806,361)	(912,471)
Cash [Member] | Quoted Market Prices in Active Markets (Level 1) [Member]
Assets:
Defined benefit plan, fair value of plan assets	16,559	16,024
US Government Agencies Debt Securities [Member]
Assets:
Plan assets at net asset value	3,229	3,206
Liability Driven Investment [Member]
Assets:
Plan assets at net asset value	3,490	2,754
Guernsey Unit Trust [Member]
Assets:
Plan assets at net asset value	999	932
Global Absolute Return [Member]
Assets:
Plan assets at net asset value	$ 2,235	$ 2,139

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Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Receivables [Abstract]
Accounts Receivable	$ 222,075	$ 248,742
Allowance for Doubtful Accounts	(4,223)	(3,494)
Accounts receivable, net	$ 217,852	$ 245,248

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Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 68,350	$ 64,113
Work in progress	21,350	16,425
Finished goods and products held for resale	52,222	44,402
Costs of unbilled projects	5,407	5,706
Reserves for excess and obsolete	(11,078)	(10,599)
Inventory, Net	$ 136,251	$ 120,047

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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Depreciation and amortization	$ 13,980	$ 12,958	$ 27,987	$ 25,385
Maintenance and repair expense	5,567	$ 5,354	11,382	$ 10,510
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	477,509		477,509		$ 447,126
Less: accumulated depreciation	(191,822)		(191,822)		(167,083)
Property, plant and equipment, net	285,687		285,687		280,043
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	356,277		356,277		338,056
Land and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	85,786		85,786		84,282
Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 35,446		$ 35,446		$ 24,788

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Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017	Jul. 01, 2017
Segment Reporting Information [Line Items]
Goodwill deductible for tax purposes	$ 139,340	$ 139,581
Neptune Benson Reporting Unit [Member]
Segment Reporting Information [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount			3.00%

XML

Goodwill Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of the period	$ 321,913
Business combinations	8,232
Measurement period adjustment	(314)
Foreign currency translation	67
Goodwill, end of the period	329,898
Operating Segments [Member] | Industrial [Member]
Goodwill [Roll Forward]
Goodwill, beginning of the period	128,190
Business combinations	2,369
Measurement period adjustment	0
Foreign currency translation	(373)
Goodwill, end of the period	130,186
Operating Segments [Member] | Municipal [Member]
Goodwill [Roll Forward]
Goodwill, beginning of the period	9,865
Business combinations	0
Measurement period adjustment	0
Foreign currency translation	96
Goodwill, end of the period	9,961
Operating Segments [Member] | Product [Member]
Goodwill [Roll Forward]
Goodwill, beginning of the period	183,858
Business combinations	5,863
Measurement period adjustment	(314)
Foreign currency translation	344
Goodwill, end of the period	$ 189,751

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Debt (Details) - USD ($)		3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 15, 2014	Mar. 31, 2018	Mar. 31, 2018	Sep. 30, 2017	Dec. 19, 2017	Jun. 30, 2017
Line of Credit Facility [Line Items]
Letters of credit outstanding, amount		$ 17,274,000	$ 17,274,000	$ 20,663,000
Debt instrument, periodic payment, principal			1,991,000
Unamortized discount (premium) and debt issuance costs, net		14,565,000	14,565,000	16,942,000
Long-term debt, gross		801,606,000	801,606,000	906,791,000
Notes payable		2,592,000	2,592,000	3,287,000
Term Loan [Member]
Line of Credit Facility [Line Items]
Line of credit facility, outstanding amount					$ 796,574,000
Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		125,000,000	125,000,000
Line of credit facility, remaining borrowing capacity		125,000,000	125,000,000	95,000,000
Debt instrument, unused borrowing capacity, amount		104,388,000	104,388,000	88,294,000
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				35,000,000
Letters of credit outstanding, amount		$ 20,612,000	$ 20,612,000	6,706,000
Minimum [Member]
Line of Credit Facility [Line Items]
Debt instrument, interest rate, stated percentage		6.26%	6.26%
Maximum [Member]
Line of Credit Facility [Line Items]
Debt instrument, interest rate, stated percentage		7.39%	7.39%
First Lien Term Facility, due December 20, 2024 [Member]
Line of Credit Facility [Line Items]
Debt instrument, term	7 years
Unamortized discount (premium) and debt issuance costs, net		$ 14,565,000	$ 14,565,000	$ 16,942,000
First Lien Term Facility, due December 20, 2024 [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 505,000,000
Debt instrument, interest rate, stated percentage		4.69%	4.69%
First Lien Term Facility, due December 20, 2024 [Member] | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	75,000,000
First Lien Term Facility, due December 20, 2024 [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 35,000,000
Second Lien Term Facility
Line of Credit Facility [Line Items]
Debt instrument, term	8 years
Second Lien Term Facility | Term Loan [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 75,000,000
2022 Borrowings | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 87,500,000	$ 87,500,000
Line of credit facility, interest rate at period end		6.50%	6.50%
Variable rate basis interest rate at period end		4.75%	4.75%
2019 Borrowings | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 37,500,000	$ 37,500,000
Line of credit facility, interest rate at period end		7.00%	7.00%	6.50%
Variable rate basis interest rate at period end		4.75%	4.75%	4.25%
Base Rate [Member] | First Lien Term Facility, due December 20, 2024 [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Variable rate basis interest rate at period end		2.00%	2.00%
Base Rate [Member] | 2022 Borrowings | Minimum [Member] | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			1.50%
Base Rate [Member] | 2022 Borrowings | Maximum [Member] | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			2.75%
Base Rate [Member] | 2019 Borrowings | Minimum [Member] | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate				2.00%
Base Rate [Member] | 2019 Borrowings | Maximum [Member] | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate				3.25%
Prime Rate [Member] | 2022 Borrowings | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			1.75%
Prime Rate [Member] | 2019 Borrowings | Revolving Credit Facility, due January 15, 2019 [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			2.25%
London Interbank Offered Rate (LIBOR) [Member] | First Lien Term Facility, due December 20, 2024 [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			3.00%
Debt instrument, interest rate, stated percentage		1.69%	1.69%
Variable rate basis interest rate at period end		3.00%	3.00%
London Interbank Offered Rate (LIBOR) [Member] | Build Own Operate Financing, due June 30, 2024 [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			3.00%
Line of Credit [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 45,000,000	$ 45,000,000	$ 35,000,000
Letters of credit outstanding, amount		51,000	$ 51,000	10,568,000
Loans Payable [Member] | Build Own Operate Financing, due June 30, 2024 [Member]
Line of Credit Facility [Line Items]
Debt instrument, term			7 years
Debt instrument, periodic payment, principal		$ 254,000
Debt instrument, fee amount						$ 50,000
Debt instrument, interest rate, stated percentage		5.08%	5.08%
Debt instrument, face amount						$ 7,100,000
Long-term debt, gross		$ 6,423,000	$ 6,423,000	$ 6,930,000
Ratings Condition Period [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			3.75%
Other than Ratings Condition Period [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			3.00%

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Debt Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Total debt	$ 801,606	$ 906,791
Less unamortized discount and lender fees	(14,565)	(16,942)
Total net debt	787,041	889,849
Current portion of debt	(11,057)	(11,325)
Total long‑term debt	775,984	878,524
First Lien Term Facility, due December 20, 2024 [Member]
Debt Instrument [Line Items]
Total debt	792,591	896,574
Revolving Credit Facility, due January 15, 2019 [Member]
Debt Instrument [Line Items]
Total debt	0	0
Notes Payable, due June 30, 2018 to July 31, 2023 [Member]
Debt Instrument [Line Items]
Total debt	2,592	3,287
Build Own Operate Financing, due June 30, 2024 [Member] | Loans Payable [Member]
Debt Instrument [Line Items]
Total debt	$ 6,423	$ 6,930

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Debt Long-term Debt Maturities (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Debt Disclosure [Abstract]
Remainder of 2018	$ 4,978
2019	9,503
2020	9,402
2021	9,429
2022	9,459
Thereafter	758,835
Long-term Debt	$ 801,606

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Product Warranties (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of the period	$ 17,274	$ 23,309
Warranty provision for sales	2,386	3,245
Settlement of warranty claims	(7,559)	(7,657)
Foreign currency translation and other	435	(413)
Balance at end of the period	$ 12,536	$ 18,484

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Restructuring and Related Charges (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 5,012
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of the period	3,542	$ 13,217
Restructuring charges related to VSP	320	15,431
Charges related to other initiatives	5,964	3,295
Write off charge and other non‑cash activity	(308)	(374)
Cash payments	(9,095)	(24,325)
Other adjustments	28	(159)
Restructuring reserve, end of the period	451	7,085
Cost of Product Sales and Services [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges related to VSP	1,936	8,141
General and Administrative Expense [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges related to VSP	3,113	4,874
Sales and Marketing Expense [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges related to VSP	733	5,377
Research and Development Expense [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges related to VSP	$ 503	$ 334

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Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 243	$ 267	$ 475	$ 518
Interest cost	123	82	241	159
Expected return on plan assets	(32)	(40)	(63)	(78)
Amortization of actuarial losses	79	188	155	364
Pension expense for defined benefit plans	$ 413	$ 497	$ 808	$ 963

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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax cuts and jobs act of 2017, provisional income tax (expense) benefit			$ 3,641
Estimated annual effective tax rate used to calculate income tax expense (benefit)			13.00%	63.10%
Federal statutory income tax rate, percent			24.50%
Effective income tax rate reconciliation, percent			31.60%	(58.90%)
Income tax (benefit) expense	$ (2,018)	$ 4,812	$ 2,393	$ 11,907
Loss before income taxes	$ 14,998	$ 83	$ 7,582	$ (20,212)

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Share Based Compensation - Narrative (Details) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 4,250,000	$ 554,000	$ 6,862,000	$ 1,020,000
Compensation cost not yet recognized, period for recognition	$ 20,230,000		20,230,000
Fair value of options vested			$ 1,670
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plan, number of shares authorized (shares)	5,100		5,100
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized, period for recognition	$ 3,073,000		$ 3,073,000
Period for recognition for unrecognized compensation expense			3 years 9 months
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition for unrecognized compensation expense			1 year 7 months
Stock-settled RSU's (shares)	1,197		1,197		0
Aggregate value	$ 25,000,000		$ 25,000,000
Evoqua Water Technologies Corp. Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards vesting percentage			25.00%
Expiration period			10 years

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Share Based Compensation - Stock Option Activity (Details) - USD ($)			6 Months Ended
	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Intrinsic value, exercises in period			$ 18,988
Options
Outstanding at beginning of the period (shares)			9,060,000
Granted (shares)			34,000
Exercised (shares)			(1,018,000)
Forfeited (shares)			(87,000)
Expired (shares)			0
Outstanding at end of the period (shares)	7,989,000	9,060,000	7,989,000
Options exercisable (shares)	5,516,000		5,516,000
Weighted Average Exercise Price/Share
Weighted average exercise price, outstanding, beginning balance (in dollars per share)			$ 5.18
Weighted average exercise price, granted (in dollars per share)			24.25
Weighted average exercise price, exercised (in dollars per share)			4.74
Weighted average exercise price, forfeited (in dollars per share)			7.65
Weighted average exercise price, expired (in dollars per share)			0.00
Weighted average exercise price, outstanding, ending balance (in dollars per share)	$ 5.29	$ 5.18	5.29
Weighted average exercise price, exercisable (in dollars per share)	$ 4.87		$ 4.87
Weighted Average Remaining Contractual Term
Weighted average remaining contractual term, outstanding	7 years 10 months 24 days	7 years 6 months
Weighted average contractual term, exercisable			6 years 6 months
Intrinsic value, outstanding	$ 10,045,000	$ 11,011,000	$ 10,045,000
Intrinsic value, exercisable	$ 5,569,000		$ 5,569,000

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Share Based Compensation - Nonvested Share Activity (Details)	6 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Fair value of options vested | $	$ 1,670
Shares
Nonvested at September 30, 2017 | shares	4,300,000
Granted (shares) | shares	34,000
Vested (shares) | shares	(1,774,000)
Forfeited (shares) | shares	(87,000)
Nonvested at March 31, 2018 | shares	2,473,000
Weighted Average Grant Date Fair Value/Share
Weighted average grant date fair value, nonvested, beginning balance (in dollars per share) | $ / shares	$ 1.36
Weighted average grant date fair value, granted (in dollars per share) | $ / shares
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	1.07
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares	2.00
Weighted average grant date fair value, nonvested, ending balance (in dollars per share) | $ / shares	$ 1.59

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Share Based Compensation - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	6 Months Ended
	Mar. 31, 2018 $ / shares shares
Shares
Outstanding at beginning of the period (shares) | shares	0
Stock granted during period, employee stock ownership plan (shares) | shares	1,201
Forfeited in period (shares) | shares	(4)
Outstanding at beginning of the period | shares	1,197
Weighted Average Grant Date Fair Value/Share
Weighted average grant date fair value, nonvested, equity instruments other than options, beginning of the period (in dollar per share) | $ / shares	$ 0.00
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	20.89
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares	20.88
Weighted average grant date fair value, nonvested, equity instruments other than options, end of the period (in dollar per share) | $ / shares	$ 20.89

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Concentration of Credit Risk (Details)	Mar. 31, 2018
Risks and Uncertainties [Abstract]
Number of countries in which entity operates	7

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Related‑Party Transactions (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Related Party Transaction [Line Items]
Number of affiliates				2
Line of credit facility, lender				1
AEA Investors LP [Member]
Related Party Transaction [Line Items]
Due to related parties	$ 38			$ 38		$ 0
Related party commitment	14,337			14,337		16,218
Advisory Fees [Member] | AEA Investors LP [Member]
Related Party Transaction [Line Items]
Fees paid to related party	333	$ 1,000		333
Customer [Member]
Related Party Transaction [Line Items]
Revenue from related parties	289		$ 1,389	585	$ 1,564
Accounts receivable, related parties	$ 1,063			1,063		$ 2,354
Expenses Excluding Advisory Fees [Member] | AEA Investors LP [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party				$ 43	$ 57

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Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Operating Leased Assets [Line Items]
Rent expense	$ 4,817	$ 4,360	$ 9,754	$ 8,833
Letters of credit outstanding, amount	17,274		17,274		$ 20,663
Equipment [Member]
Operating Leased Assets [Line Items]
Capital leased assets, gross	48,146		48,146		43,727
Capital leases, carrying value	30,613		30,613		30,302
Letter of Credit [Member]
Operating Leased Assets [Line Items]
Letters of credit outstanding, amount	20,612		20,612		6,706
Surety Bond [Member]
Operating Leased Assets [Line Items]
Surety bonds	87,849		87,849		98,820
Siemens [Member]
Operating Leased Assets [Line Items]
Letters of credit outstanding, amount	901		901		922
Siemens [Member] | Surety Bond [Member]
Operating Leased Assets [Line Items]
Surety bonds	$ 12,970		$ 12,970		$ 5,570
Minimum [Member]
Operating Leased Assets [Line Items]
Lessor, operating lease, term of contract			5 years
Minimum [Member] | Surety Bond [Member]
Operating Leased Assets [Line Items]
Financial instruments, commitments, expiration period			12 months
Maximum [Member]
Operating Leased Assets [Line Items]
Lessor, operating lease, term of contract			20 years
Maximum [Member] | Surety Bond [Member]
Operating Leased Assets [Line Items]
Financial instruments, commitments, expiration period			10 years

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Commitments and Contingencies Future Minimum Rental Payments for Operating Leases (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2018	$ 5,497
2019	9,920
2020	8,456
2021	6,459
2022	4,121
Thereafter	10,275
Total	$ 44,728

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Commitments and Contingencies Future Minimum Rental Payments under Capital Lease (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Capital Leased Assets [Line Items]
Remainder of 2018	$ 5,278
2019	9,757
2020	8,166
2021	5,082
2022	3,194
Thereafter	1,860
Total	33,337
Capital Leases, Future Minimum Payments, Interest Included in Payments	2,196
Present value of net minimum capital lease payments	31,141
Obligations under capital leases	10,728	$ 9,777
Obligations under capital leases, excluding current installments	$ 20,413
Capital lease obligations | Minimum [Member]
Capital Leased Assets [Line Items]
Capital leases of lessee, basis spread on variable rate	2.15%
Capital lease obligations | Maximum [Member]
Capital Leased Assets [Line Items]
Capital leases of lessee, basis spread on variable rate	3.65%

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Commitments and Contingencies Future Minimum Lease Payments Receivable under Operating Leases (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2018	$ 3,147
2019	6,107
2020	7,257
2021	5,547
2022	5,395
Thereafter	63,356
Future minimum lease payments	$ 90,809

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Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Payables and Accruals [Abstract]
Salaries, wages and other benefits	$ 30,287	$ 52,116
Severance payments	451	3,542
Taxes, other than income	10,289	9,244
Obligations under capital leases	10,728	9,777
Third party commissions	4,810	6,968
Insurance liabilities	5,640	4,915
Provisions for litigation	1,117	4,715
Earn outs related to acquisitions	4,765	4,304
Other	23,911	26,342
Accrued expenses and other liabilities	$ 91,998	$ 121,923

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Business Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments	3		3
Segment Reporting Information [Line Items]
Revenue from product sales and services	$ 333,690	$ 299,901	$ 630,740	$ 579,773
Sales to external customers	333,690	299,901	630,740	579,773
Earnings before interest, taxes, depreciation and amortization (EBITDA)	46,288	30,854	75,998	43,959
Depreciation and amortization	20,480	18,873	40,363	37,520
Income (loss) from operations	25,808	11,981	35,635	6,439
Interest expense	(10,810)	(11,898)	(28,053)	(26,651)
Income (loss) before income taxes	14,998	83	7,582	(20,212)
Income tax benefit (expense)	(2,018)	4,812	2,393	11,907
Net income (loss)	12,980	4,895	9,975	(8,305)
Capital expenditures	16,413	13,566	31,670	27,229
Assets	1,499,859		1,499,859		$ 1,473,309
Goodwill	329,898		329,898		321,913
Industrial [Member]
Segment Reporting Information [Line Items]
Capital expenditures	11,554	10,765	20,502	21,764
Municipal [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1,225	838	2,972	1,434
Product [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1,139	1,596	2,321	2,581
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from product sales and services	21,995	18,236	44,294	33,722
Intersegment Eliminations [Member] | Industrial [Member]
Segment Reporting Information [Line Items]
Revenue from product sales and services	2,690	1,048	5,764	2,347
Intersegment Eliminations [Member] | Municipal [Member]
Segment Reporting Information [Line Items]
Revenue from product sales and services	9,214	5,140	16,621	11,895
Intersegment Eliminations [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenue from product sales and services	10,091	12,048	21,909	19,480
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from product sales and services	355,684	318,138	675,035	613,496
Operating Segments [Member] | Industrial [Member]
Segment Reporting Information [Line Items]
Revenue from product sales and services	183,949	161,505	352,217	308,510
Sales to external customers	181,259	160,457	346,453	306,163
Earnings before interest, taxes, depreciation and amortization (EBITDA)	41,713	35,373	81,840	67,374
Depreciation and amortization	10,709	9,528	20,854	18,440
Income (loss) from operations	31,004	25,845	60,986	48,934
Assets	480,435		480,435		461,471
Goodwill	130,186		130,186		128,190
Operating Segments [Member] | Municipal [Member]
Segment Reporting Information [Line Items]
Revenue from product sales and services	73,498	68,694	142,811	138,080
Sales to external customers	64,284	63,554	126,190	126,185
Earnings before interest, taxes, depreciation and amortization (EBITDA)	9,758	8,526	16,350	17,088
Depreciation and amortization	1,777	2,050	3,577	4,125
Income (loss) from operations	7,981	6,476	12,773	12,963
Assets	139,195		139,195		155,698
Goodwill	9,961		9,961		9,865
Operating Segments [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenue from product sales and services	98,237	87,939	180,007	166,906
Sales to external customers	88,147	75,890	158,097	147,425
Earnings before interest, taxes, depreciation and amortization (EBITDA)	22,972	16,956	33,646	31,855
Depreciation and amortization	3,087	3,105	6,076	6,639
Income (loss) from operations	19,885	13,851	27,570	25,216
Assets	535,792		535,792		513,941
Goodwill	189,751		189,751		183,858
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Earnings before interest, taxes, depreciation and amortization (EBITDA)	(28,155)	(30,001)	(55,838)	(72,358)
Depreciation and amortization	4,907	4,190	9,856	8,316
Income (loss) from operations	(33,062)	(34,191)	(65,694)	(80,674)
Capital expenditures	2,495	$ 367	5,875	$ 1,450
Assets	$ 344,437		$ 344,437		$ 342,199

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Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Numerator for basic and diluted loss per common share—Net (loss) income attributable to Evoqua Water Technologies	$ 12,503	$ 3,198	$ 8,790	$ (10,401)
Denominator:
Denominator for basic net (loss) income per common share—weighted average shares	113,770	104,632	113,770	104,632
Effect of dilutive securities:
Share‑based compensation	5,445	3,109	5,773	0
Denominator for diluted net loss per common share—adjusted weighted average shares	119,215	107,741	119,543	104,632
Basic (loss) earnings per common share (in dollars per share)	$ 0.11	$ 0.03	$ 0.08	$ (0.10)
Diluted (loss) earnings per common share (in dollars per share)	$ 0.10	$ 0.03	$ 0.07	$ (0.10)
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)				8,901

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Subsequent Events (Details) - EUR (€) € in Thousands			6 Months Ended
	Apr. 09, 2018	Apr. 02, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Granted (shares)			34,000
Employee Stock Option [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Granted (shares)		1,325,000
Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Stock granted during period, nonemployee stock ownership plan (shares)			1,201,000
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Stock granted during period, nonemployee stock ownership plan (shares)		19,000
Subsidiaries [Member] | WTG Holdings Coöperatief U.A. [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from divestiture of business	€ 350,000