X0306 4 2020-02-20 0001421517 Energy Recovery, Inc. ERII 0001668423 Smith Emily C/O ENERGY RECOVERY 1717 DOOLITTLE DRIVE SAN LEANDRO CA 94577 1 SVP, Corp Dev and Ops Common Stock 2020-02-20 4 S 0 7683 11.0177 D 46357 D Common Stock 2020-02-21 4 S 0 180 11 D 46177 D Common Stock 2020-02-24 4 F 0 125 10.42 D 46052 D This transaction was effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on December 13, 2019. This figure is the weighted average sales price of multiple transactions. The Reporting Person undertakes to provide the SEC staff, ERI or a shareholder of ERI full information about the number of shares sold at each separate price upon request. Payment of tax obligation by withholding securities incident to the vesting of the securities in accordance with Rule 16b-3(e). /s/ William Yeung, Attorney-in-Fact for Emily Smith 2020-02-24