More details about the final PFAS drinking water standards.
For PFOA and PFOS, EPA is setting a Maximum Containment Level Goal – a non-enforceable health-based goal – at zero. This reflects the latest science showing that there is no level of exposure to these contaminants without risk of health impacts, including certain cancers.
EPA is setting enforceable Maximum Containment Levels at 4.0 parts per trillion PFOA and PFOS individually. This standard will reduce exposure from these PFAS in our drinking water to the lowest levels that are feasible for effective implementation.
For PFNA, PFHxS and “Gen X Chemicals,” EPA is setting the MCLGs and MCLs at 10 parts per trillion.
Because PFAS can often be found together in mixtures, and research shows these mixtures may have combined health impacts, EPA is also setting a limit for any mixture of two or more of the following: PFAS, PFNA, PFHxS, PFBS and “GenX Chemicals.”
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