Pure Water Soquel (PWS) is Soquel Creek Water District's groundwater replenishment and seawater intrusion prevention project. PWS will take highly treated wastewater that would have previously been discharged into the Monterey Bay National Marine Sanctuary and purify it using a proven three-step advanced treatment process consisting of microfiltration, reverse osmosis, and ultraviolet light with hydrogen peroxide. This high-quality water will replenish the groundwater basin — our sole source of drinking water— to prevent further saltwater contamination and provide a reliable, sustainable, and drought-proof water supply.