Nation’s Largest Seawater Desalination Plant Enhances Water Supply Reliability for San Diego County

After three years of construction, the San Diego County Water Authority and Poseidon Water dedicated the Claude “Bud” Lewis Carlsbad Desalination Plant on Dec. 14, 2015.

The plant is producing approximately 50 million gallons per day of locally controlled water for San Diego County, helping to minimize the region’s vulnerability to statewide drought conditions. It is part of a $1 billion project that includes the nation’s largest and most technologically advanced and energy-efficient seawater desalination plant, a 10-mile large-diameter pipeline and improvements to Water Authority facilities for distributing desalinated seawater throughout San Diego County. The plant meets about 7 to 10 percent of the region’s water demand – about one third of all the water generated in the county. For details on the plant, visit