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California's limited water supply comes from two main sources: surface water, or water that travels or gathers on the ground, like rivers, streams, and lakes; and groundwater, which is water that is pumped out from the ground.
Summary. Ninety-three percent of Californians rely on publicly supplied water to meet their domestic water needs. Eighty-two percent of the water supplied by public water districts for domestic and other uses come from rivers, lakes, reservoirs, and other surface water sources (Kenny et al. 2009).
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At the heart of California’s water system is the Sacramento-San Joaquin Delta. It's a natural feature of California’s hydrology, where the state’s two mighty rivers join and find their way to sea.
A drone provides a view of water pumped from the Harvey O. Banks Delta Pumping Plant into the California Aqueduct. Photo by Ken James / DWR. The State Water Project, operated by the California Department of Water Resources, conveys 2.3 million acre-feet on average from Northern California to the Bay Area, the southern San Joaquin Valley, and Southern California, irrigating 750,000 acres of farmland and providing at least a portion of the drinking water for 23 million people.
Sep 15, 2014 · About 30 percent of California’s total annual water supply comes from groundwater in normal years, and up to 60 percent in drought years. Local communities’ usage may be different; many areas rely exclusively on groundwater while others use only surface water supplies.
Eighty‐two percent of the water supplied by public water districts for domestic and other uses come from rivers, lakes, reservoirs, and other surface water sources (Kenny et al. 2009). The quality of the water flowing into these sources is directly affected by the condition of the land .
Sep 15, 2014 · California’s Water Supply. California depends on two sources for its water: surface water and groundwater. The water that runs into rivers, lakes and reservoirs is called “surface water.” Groundwater is found beneath the earth’s surface in the pores and spaces between rocks and soil. These are called aquifers.
