0001437749-20-007352 4 1 20200320 20200408 20200408 Hanstveit Arve 0001430122 4 34 001-34112 20782843 C/O ENERGY RECOVERY, INC. 1908 DOOLITTLE DRIVE SAN LEANDRO CA 94577 Energy Recovery, Inc. 0001421517 3559 010616867 DE 1231 1717 DOOLITTLE DRIVE SAN LEANDRO CA 94577 (510) 483-7370 1717 DOOLITTLE DRIVE SAN LEANDRO CA 94577 4 1 rdgdoc.xml FORM 4 X0306 4 2020-03-20 0001421517 Energy Recovery, Inc. ERII 0001430122 Hanstveit Arve C/O ENERGY RECOVERY, INC. 1717 DOOLITTLE DRIVE SAN LEANDRO CA 94577 1 Common Stock 2020-03-20 4 S 0 23067 7.1064 D 1072733 D Common Stock 2020-03-24 4 S 0 9000 7.0383 D 1063733 D Common Stock 2020-03-24 4 S 0 14000 7.1159 D 1049733 D The sales reported in this Form 4 were made by a broker, without instruction by the reporting person, to satisfy a margin call by the broker, to whom these shares were pledged as collateral for a margin account. /s/ William Yeung, Attorney-in-Fact for Arve Hanstveit 2020-04-08