X0306 4 2018-03-14 0 0001604643 Evoqua Water Technologies Corp. AQUA 0001720175 Stas Benedict J. EVOQUA WATER TECHNOLOGIES CORP. 210 SIXTH AVENUE PITTSBURGH PA 15222 0 1 0 0 EVP, CFO & Treasurer Common Stock 2018-03-14 4 M 0 178000 4.64 A 397023 D Common Stock 2018-03-14 4 F 0 91013 23.40 D 306010 D Stock Option (Right to Buy) 4.64 2018-03-14 4 M 0 178000 0 D 2025-04-06 Common Stock 178000 653184 D This amount includes 203,545 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 415,592 underlying shares (including the 178,000 shares underlying the portion of the stock option being exercised) and will vest with respect to the remaining 415,592 underlying shares in equal installments on March 30, 2018 and March 30, 2019. /s/ John DiMascio, Attorney-in-Fact for Benedict J. Stas 2018-03-16