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On May 18, 2026, the U.S. Environmental Protection Agency (EPA) announced two proposed rules. The first proposed rule would uphold the federal drinking water Maximum Contaminant Levels (MCL) for perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) while providing an option for drinking water systems to request two additional years to comply with the enforceable limits. The second proposed rule would rescind the regulatory determinations and regulations for perfluorohexane...

On October 31, 2024, U.S. Environmental Protection Agency (EPA) Administrator Michael S. Regan signed a final rule revising the regulations for decabromodiphenyl ether (decaBDE) and phenol, isopropylated phosphate (3:1) (PIP (3:1)), two of the five persistent, bioaccumulative, and toxic (PBT) chemicals addressed in final rules issued under the Toxic Substances Control Act (TSCA) in January 2021. According to the pre-publication version of the final rule (which is only available on EPA’s...

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...