Effective July 13, 2018, the California State Water Resources Control Board’s Division of Drinking Water (DDW) established drinking water notification levels of 14 ppt for PFOA and 13 ppt for PFOS, and a combined PFOA/PFOS drinking water response level of 70 ppt. Notification and response levels are non-binding, health-based advisory levels for contaminants in drinking water where maximum contaminant levels (MCLs) have not been promulgated. Establishment of notification and response levels often is the DDW’s first step toward adopting binding MCLs.
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