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The U.S. Environmental Protection Agency (EPA) issued on April 26, 2024, the final National Primary Drinking Water Regulation (NPDWR) for six per- and polyfluoroalkyl substances (PFAS). 89 Fed. Reg. 32532. The NPDWR establishes Maximum Contaminant Levels (MCL) for six PFAS in drinking water: perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS), perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), and hexafluoropropylene oxide dimer acid (HFPO-DA) as contaminants...