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Vacaville officials report chromium‑6 above new state limit in some wells; compliance plan due 2026
Summary
City staff told the council that nine Vacaville groundwater wells showed chromium‑6 above 1 ppb, four exceeded California's 10 ppb MCL adopted in October 2024; staff said they are working with state regulators on a compliance plan and will notify customers.
Vacaville water officials told the City Council on Aug. 12 that routine testing found chromium‑6 (hexavalent chromium) in groundwater wells serving the city and that four of the nine municipal wells exceeded California''s new maximum contaminant level (MCL) of 10 parts per billion adopted in October 2024.
The city's water quality manager, Mindy Bolli, and Utilities Director Justin Cole said the triennial public health goals report (covering 2022''–2024) shows five constituents that exceed California public health goals — including arsenic, coliform bacteria, gross alpha, PFOA and PFOS — but that none of those five require additional treatment because the public health goals are more stringent than enforceable MCLs and reducing to those goals would be technically and financially infeasible.
The nut graf: City staff emphasized Vacaville meets its current federal and state…
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