This layer displays the Alamitos Barrier Project, Dominguez Gap Barrier Project, and West Coast Basin Project injection wells.  The seawater barrier is a series of injection wells, installed parallel to the coast, which protect the groundwater from saltwater intrusion by continuously injecting freshwater to form a protective pressure ridge.  The seawater barriers protect a 32,000,000 acre-foot groundwater reservoir from contamination by saltwater intrusion.  Over five million residents of the Southern California Coastal Plain depend on this groundwater that provides approximately 40 percent of their potable water supply.  Besides being the lowest cost water available, this groundwater reservoir serves as a strategic reserve in the event imported water supplies are interrupted due to drought or delivery system failure.  Los Angeles County Public Works currently operates and maintains three seawater barriers, which includes a network of 313 injection wells.
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