X0306 4 2018-03-14 1 0001604643 Evoqua Water Technologies Corp. AQUA 0001720174 Irwin James M. EVOQUA WATER TECHNOLOGIES CORP. 210 SIXTH AVENUE PITTSBURGH PA 15222 0 1 0 0 Executive Vice President Common Stock 2018-03-14 4 M 0 10915 6.49 A 37336 D Common Stock 2018-03-14 4 F 0 5412 23.40 D 31924 D Stock Option (Right to Buy) 6.49 2018-03-14 4 M 0 10915 0 D 2026-05-23 Common Stock 10915 110394 D This amount includes 21,552 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. This option is vested with respect to 30,327 underlying shares (including the 10,915 shares underlying the portion of the stock option being exercised) and will vest with respect to the remaining 90,982 underlying shares in substantially equal installments on May 23, 2018, May 23, 2019 and May 23, 2020. /s/ John DiMascio, Attorney-in-Fact for James M. Irwin 2018-03-16