Environmental Working Group Jul 8 2025 Drinking water treatment that pursues a multi-contaminant approach, tackling several pollutants at once, could prevent more than 50,000 lifetime cancer cases in the U.S., finds a new peer-reviewed study by the Environmental Working Group. The finding challenges the merits of regulating one tap water contaminant at a time, the long-standing practice of states and the federal government.  In the paper, published in the journal Environmental Research , EWG