Exhibit 99.1 Energy Recovery Reports its First Quarter 2025 Financial Results SAN LEANDRO, Calif. - May 7, 2025 – Energy Recovery, Inc. (Nasdaq:ERII) ("Energy Recovery" or the "Company") today announced its financial results for the first quarter ended March 31, 2025. First Quarter Highlights In conjunction with these financial results, management has released a letter to shareholders reviewing business and financial updates from the first quarter and discussing our outlook for 2025. This letter is located ...