Where does California get most of its drinking water from?

Written by Editorial Team | Last Updated: August 2026

California obtains its municipal and agricultural drinking water from a complex, highly integrated network of surface water sources and subterranean groundwater basins. A massive share of surface water originates from Sierra Nevada snowpack accumulation, which melts during the spring and feeds a vast system of rivers, natural lakes, and artificial reservoirs managed by the State Water Project and the federal Central Valley Project. Additionally, coastal and interior communities rely heavily on regional groundwater aquifers, alongside growing investments in advanced water recycling, desalination, and water conservation infrastructure.

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