Blog Post

EPA Issues Final PFAS National Primary Drinking Water Regulation

Environmental and Energy Trends Watch

On April 10, 2024, the Environmental Protection Agency (“EPA”) finalized the National Primary Drinking Water Regulation for six per- and polyfluoroalkyl substances (“PFAS”). PFAS, also known as “forever chemicals,” are widely used in industry and consumer products. According to the EPA, these chemicals have been linked to serious adverse health effects, including cancer and other serious illnesses. The final rule establishes national standards for specific PFAS, both individually and as mixtures, often found in drinking water.

The Final Rule

The final rule sets individual enforceable Maximum Contaminant Level (“MCL”) limits for five PFAS. MCLs are the highest levels of a contaminant that are allowed in drinking water. For mixtures containing two or more of four PFAS, the rule sets a Hazard Index Level. Finally, the rule also sets a Maximum Contaminant Level Goal for each individual PFAS and mixtures, which is a non-enforceable health goal set at a level below which there is no known or expected risk to health.

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