Mission Basin Groundwater Purification Facility

The Mission Basin Groundwater Purification Facility is a desalting treatment facility that provides 15% of the city’s water supply.

The Facility uses reverse osmosis (RO) to treat local brackish groundwater extracted from the Mission Basin. The RO treatment process reduces salt concentrations in the groundwater; additional treatment removes iron and manganese.

The Facility was put into service in 1992 with a capacity of 2.0 million gallons per day (MGD) and expanded to its current capacity of 6.4 mgd in 2002.