 HOUSTON, Aug. 3, 2021 PRNewswire -- Select Energy Services, Inc. NYSE: WTTR Select or the Company, a leading provider of sustainable water and chemical solutions to the U.S. unconventional oil and gas industry, today announced results for the quarter ended June 30, 2021. Revenue for the second quarter of 2021 was 161.1 million as compared to 143.7 million in the first quarter of 2021 and 92.2 million in the second quarter of 2020. 