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The U.S. Environmental Protection Agency (EPA) established a health advisory level for PFOS and PFOA in drinking water at 70 parts per trillion (70 ppt). The EPA based the advisory level on the best available studies about health effects. The advisory level offers people—including those in sensitive groups—with a margin of protection from a lifetime of exposure to the chemicals. The EPA’s health advisories are non-enforceable and non-regulatory and provide technical information to state agencies and other public health officials on health effects, analytical methodologies, and treatment technologies associated with drinking water contamination.