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US EPA finalizes first national PFAS drinking-water standards

Enforceable limits of 4 ng/L for PFOA and PFOS set a global reference point — and a multi-billion-dollar treatment market in motion.

The US Environmental Protection Agency finalized the first legally enforceable national drinking-water standards for per- and polyfluoroalkyl substances in April 2024, setting maximum contaminant levels of 4 ng/L for PFOA and PFOS, with additional limits and a hazard-index approach covering PFHxS, PFNA, HFPO-DA (GenX) and PFBS mixtures.

Public water systems face monitoring obligations and treatment deadlines phased over the following years. The rule effectively creates one of the largest addressable markets in municipal treatment — granular activated carbon, ion exchange and high-pressure membranes — and set a benchmark regulators in other jurisdictions now cite.

WaterAtlas maintains a PFAS technology overview in the Wiki, and tracks suppliers of sorbents, resins and membranes in the directory.

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