City Council Agenda
Memo to:
Manteca City Council
From:
Jose Jasso, Assistant City Manager / Interim Director of Public Works
Prepared by:
George Montross, Deputy Director of Public Works / Water Resources
Date:
October 21, 2025
Subject:
Adopt a Resolution Acknowledging the Detection of Perfluorooctanoic Acid (PFOA) and Perfluorohexane Sulfonic Acid (PFHxS) at Wells 19 and 22
Recommendation:
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Adopt a resolution acknowledging that the Manteca City Council was notified by the Public Works Department that Perfluorooctanoic Acid (PFOA) and Perfluorohexane Sulfonic Acid (PFHxS), chemicals commonly used in a wide range of products and industrial processes, were detected in raw water source samples from Wells 19 and 22, at levels exceeding the State Water Board's Division of Drinking Water (DDW) Notification Levels; and authorize the Public Works Department to forward the resolution to the DDW.
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Background:
Raw water samples collected from Wells 19, located at 290 South Powers Avenue, and 22, located at 376 Victory Avenue, had detections of Perfluorooctanoic Acid (PFOA) and Perfluorohexane Sulfonic Acid (PFHxS) above the State Water Resources Control Board's Division of Drinking Water (DDW) Notification Levels.
Notification levels are nonregulatory, health based advisory levels and not enforceable standards. DDW requires notification of the City Council of exceedances, including to provide information on the health based risks associated with these chemicals. The health based risks associated with PFOA and PFHxS include problems with the liver, immune system, thyroid and may lead to an increased risk of certain cancers, including testicular and kidney cancers.
The highest detections are from the raw water supply, not from treated water which is distributed to customers. Treated water sample results from Well 19 are in compliance with DDW Notification Levels. Treated water sample results from Well 22 for PFOA are in compliance, however ...
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