Complying with PFAS MCLs

The maximum contaminant levels (MCLs) for a handful of PFAS, represent the U.S. Government’s first enforceable regulatory action to address these chemical compounds. Environmental scientists expect large volumes of surface and groundwater used to supply drinking water across the U.S. will require PFAS treatment and removal to comply with the lower threshold concentrations. In their Consumer Confidence Reports (CCRs), community water systems will be required to include the level of the regulated PFAS measured in their drinking water, as well as the potential health effects of the regulated PFAS detected in violation of the rule.

One year after the release of EPA's first PFAS MCLs, the agency proposed several changes, primarily focused on the compliance timeline and the additional analytes (PFHxS, PFNA, GenX).