EPA proposes national primary drinking water regulation for six PFAS

The EPA has proposed a National Primary Drinking Water Regulation (NPDWR) establishing new enforceable maximum contaminant limits (MCLs) for certain per- and polyfluoroalkyl substances (PFAS) known to occur in drinking water along with health-based, non-enforceable maximum contaminant level goals (MCLGs). The proposed MCLs for perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) are 4 parts per trillion individually, a limit stricter than any state has enacted. The EPA has proposed a novel approach for regulating the remaining four PFAS substances, perfluorononanoic acid (PFNA), hexafluoropropylene oxide dimer acid (HFPO-DA, commonly known as GenX Chemicals), perfluorohexane sulfonic acid (PFHxS), and perfluorobutane sulfonic acid (PFBS), by establishing a combined enforceable MCL at a “hazard index” of 1.0. This is a pre-publication of the proposed rule which should be published in the Federal Register soon.

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