On March 14, 2023, the U.S. EPA proposed a National Primary Drinking Water Regulation (NPDWR) to establish legally enforceable Maximum Contamination Levels (MCLs) for six PFAS in drinking water.
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The proposed rule will regulate two PFAS compounds — PFOA and PFOS — as individual contaminants with an MCL of 4 parts per trillion (ppt) each.
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It also will regulate four other PFAS chemicals — PFHxS, PFNA, PFBS, and HFPO-DA (commonly called GenX) — as a mixture. This mixture will be assessed using a Hazard Index with the MCL set to 1.0 (unitless) Hazard Index.
As part of the proposed rule, drinking water systems will be required to monitor for these PFAS, notify the public if levels exceed the MCLs, and reduce the chemicals in drinking water if they exceed the proposed MCL. Monitoring requirements will be based on the source and size of water systems.
The proposed rule also sets health-based, non-enforceable MCL Goals (MCLGs) for the six PFAS at 0 ppt for PFOA and PFOS, and 1.0 Hazard Index for the remaining four chemical compounds individually or in a mixture.
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