The California State Water Project is a water storage and delivery system of reservoirs, aqueducts, power plants and pumping plants stretching more than 600 miles from Lake Oroville in the north to Lake Perris in the south. Its main purpose is to store water and distribute it to urban and agricultural water suppliers in Northern California, the San Francisco Bay Area, the San Joaquin Valley and Southern California. The project is also operated to improve water quality in the Sacramento-San Joaquin River Delta, control Feather River flood waters, provide recreation, and enhance fish and wildlife.The State Water Project is operated by the California Department of Water Resources, and makes deliveries to approximately two-thirds of California's population.Of the contracted water supply, approximately 70 percent goes to urban users and 30 percent goes to agricultural users.
In 1965 the state of California began delivering water to Santa Clara County via the 72-inch South Bay Aqueduct, which brings water about 40 miles from the Sacramento-San Joaquin River Delta to a point about six miles inside the northern county boundary.
The district has a contract for 100,000 acre-feet per year of water from the SWP, delivered via the Harvey O. Banks Pumping Plant in the southern delta and the aqueduct.