Largest facility of its kind in Northern California will remove PFAS from groundwater Zone 7 Water Agency celebrated the grand opening of its new Chain of Lakes (COL) PFAS Treatment Facility today with a ribbon-cutting ceremony, the largest facility of its kind in Northern California. The facility expands Zone 7’s commitment to delivering safe, clean drinking water to the Tri-Valley community, marking another milestone in the proactive management of per- and polyfluoroalkyl substances (PFAS) in the
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