The Environmental Protection Agency (EPA) issued a final rule that sets drinking water standards from 4.0 parts per trillion to 10 parts per trillion for five individual per-and polyfluoroalkyl (PFAS) substances, including PFOA, PFOS, PFNA, PFHxS, and HFPO-DA (also known as “GenX Chemicals”).
The individual PFAS limits set in the final rule, issued on April 10, 2024, depend on the chemicals. The rule sets limits for the five individual PFAS chemicals and mixtures of any two or more of four PFAS: PFNA, PFHxS, PFBS, and “GenX chemicals.”