Tapping into a number of water sources, San Jose Water, the primary subsidiary of SJW, provides water utility services to approximately 225,000 customers (about 1 million people) in California's Santa Clara County. To obtain its water supply, San Jose Water taps wells and surface sources and buys water from the Santa Clara Valley Water District. It also collects local mountain surface water from the watershed in the Santa Cruz Mountains, which is then treated at San Jose Water's two treatment plants. This local surface water accounts for about 7% of the water utility's total supply. Purchased water accounts for more than 40%.