X0306 4 2018-03-19 0 0001604643 Evoqua Water Technologies Corp. AQUA 0001353838 Keating Ronald C EVOQUA WATER TECHNOLOGIES CORP. 210 SIXTH AVENUE PITTSBURGH PA 15222 1 1 0 0 President & CEO Common Stock 2018-03-19 4 S 0 294149 21.285 D 479179 D Common Stock 2018-03-21 4 S 0 44122 21.285 D 435057 D This sale of shares of the issuer's common stock was matchable under Section 16(b) of the Securities Exchange Act of 1934, to the extent of 3,000 shares, with the purchase by the reporting person of 3,000 shares of the issuer's common stock at a price of $18.00 per share on November 6, 2017 as part of a directed share program in connection with the issuer's initial public offering. The reporting person has agreed to pay to the issuer $9,855.00, representing the full amount of the profit realized in connection with the short-swing transaction, less the underwriting discount of $0.715 per share. These shares of common stock were sold pursuant to the Underwriting Agreement dated March 14, 2018. This amount represents the $22.00 public offering price per share of the issuer's common stock less the underwriting discount of $0.715 per share. This amount includes 431,035 unvested restricted stock units in respect of the issuer's common stock. These restricted stock units are scheduled to vest as described in the Form 4 filed by the reporting person on November 6, 2017. /s/ John DiMascio, Attorney-in-Fact for Ronald C. Keating 2018-03-21