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Winters reviews plan to meet chromium‑6 drinking‑water limit by Oct. 2027
Summary
City staff and Kennedy Jenks consultants presented an implementation plan to meet a state chromium‑6 maximum contaminant level of 10 µg/L by Oct. 1, 2027. The plan proposes ion‑exchange treatment at Well 8, pilot testing at Well 7, planning‑level construction estimates in the low millions, and a workplan to pursue state loans and grants.
The Winters City Council on Jan. 20 heard a technical briefing on the city’s plan to comply with California’s reestablished hexavalent chromium (chromium‑6) maximum contaminant level of 10 micrograms per liter by Oct. 1, 2027. City staff said the compliance deadline requires “completing the treatment design and permitting in time to advertise bids in late 2026.”
Sachi Idagaki, a civil engineer with Kennedy Jenks Consultants, told the council the city’s most recent sampling shows Wells 5, 6 and 7 exceed the 10 µg/L threshold while Wells 2 and 4 are currently below it. Idagaki summarized the Division of Drinking Water’s approved chronic treatment technologies — reduction/coagulation/filtration (RCF), reverse osmosis, and ion exchange — and said ion exchange is the simplest option for wellhead applications and…
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