EPA has made final determinations to regulate two contaminants, perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA). EPA is currently moving forward to implement the national primary drinking water regulation development process for per- and polyfluoroalkyl substances (PFAS). The Regulatory Determinations outline avenues that the agency is considering to further evaluate additional PFAS chemicals and provide flexibility for the agency to consider groups of PFAS as supported by the best available science. EPA's Office of Ground Water and Drinking Water (OGWDW) and Office of Science and Technology (OST) have developed draft documents to support EPA's National Primary Drinking Water Rulemaking for PFAS and have requested SAB review.
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