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Commitments and Contingencies
 9 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies Commitments and Contingencies
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. 
The following summarizes the Company’s outstanding letters of credit and surety bonds as of June 30, 2020 and September 30, 2019, respectively.
 
June 30,
2020
 
September 30,
2019
Revolving credit capacity
$
45,000

 
$
45,000

Letters of credit outstanding
11,872

 
12,956

Remaining revolving credit capacity
$
33,128

 
$
32,044

 
 
 
 
Surety capacity
$
230,000

 
$
220,000

Surety issuances
148,108

 
144,717

Remaining surety available
$
81,892

 
$
75,283



The longest maturity date of letters of credit and surety bonds in effect as of June 30, 2020 was March 20, 2030.
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.