EPA Proposes Landmark Drinking Water Rules To Regulate Six PFAS

In a historic move, EPA is proposing tough new national primary drinking water regulation (NPDWR) for six PFAS in drinking water, including strict limits on perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) -- the two most-studied substances -- at 4 parts per trillion (ppt), a level more stringent than any state has set, while regulating four other PFAS as a mixture using a novel “hazard index” approach. EPA’s proposed rule , released March 14, is the first federally enforceable...