Issuance Of Notification And Response Levels For Perfluorohexane Sulfonic Acid (PFHxS) In Drinking Water, Updated Monitoring Orders

November 2, 2022

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On October 31, 2022, under the authority of the Deputy Director of the State Water Board’s Division of Drinking Water (Division), California issued a notification level of 3 parts per trillion (ppt) and a response level of 20 ppt for perfluorohexane sulfonic acid (PFHxS).

Notification and response levels are nonregulatory, health-based advisory levels established for contaminants in drinking water for which maximum contaminant levels have not been established. Notification and response levels are established as precautionary measures for contaminants that may be considered candidates for establishment of maximum contaminant levels, but have not yet undergone or completed the regulatory standard setting process prescribed for the development of maximum contaminant levels and are not drinking water standards.