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We consent to the incorporation by reference in Registration Statement No. 333-233730 on Form S-3 and Registration Statement No. 333-152142, 333-165559, 333-180076, and 333-212707 on Form S-8 of our reports dated March 12, 2021, relating to the consolidated financial statements of Energy Recovery, Inc. and the effectiveness of Energy Recovery, Inc.’s internal control over financial reporting appearing in this Annual Report on Form 10-K of Energy Recovery, Inc. for the year ended December 31, 2020.