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On October 29, 2025, under the authority of the Deputy Director of the State Water Board’s Division of Drinking Water (Division), California issued new and revised notification levels for perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), perfluorohexane sulfonic acid (PFHxS), and perfluorohexanoic acid (PFHxA).
The current notification and response levels for these four per- and polyfluoroalkyl substances (PFAS) are now as shown below:
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PFOA: notification level = 4.0 ng/l, response level = 10 ng/l
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PFOS: notification level = 4.0 ng/l, response level = 40 ng/l
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PFHxS: notification level = 3.0 ng/l, response level = 10 ng/l
- PFHxA: notification level = 1.0 ug/l, response level = 10 ug/l
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.
For information on notification and response levels, please visit: https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/NotificationLevels.html
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