 HOUSTON, May 4, 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 March 31, 2021. John Schmitz, Chairman of the Board, President and CEO, stated, During the first quarter, we continued to see revenue improvements across all of our business segments with 8 consolidated revenue growth, led by our Oilfield Chemicals segment. 