City of San Diego, California

Pure Water San Diego is a phased, multi-year, reservoir augmentation program that will use water purification technology to produce a safe, sustainable, high-quality water supply for San Diego’s 1.3 million residents.

San Diego proved that purified water can be safely produced through the multi-barrier method of membrane filtration, reverse osmosis, and advanced oxidation with ultraviolet light and hydrogen peroxide. More than 25,000 water quality tests have determined that purified water is safe and meets all federal and state drinking water standards. The water is so pure it is nearly the quality of distilled water. Following review by regulatory bodies, the California Department of Public Health and San Diego Water Board approved the City of San Diego’s purification concept.

San Diego’s long-term water supply solution will account for one-third of the city’s future water portfolio. In the near-term, up to 30 million gallons per day are planned for 2021. The long-term goal of producing 83 million gallons of purified water a day is expected to be achieved in 2035.