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Water tankWater Sources
Across America, the sources of drinking water include rivers, lakes, streams, ponds, reservoirs, springs, and groundwater wells. The source of the water that you receive as a San Jose Municipal Water System customer depends on which service area you live in: Evergreen, North San José / Alviso, Edenvale, or Coyote Valley.

The San Jose Municipal Water System purchases treated surface water from the Santa Clara Valley Water District (District) and delivers it to our Evergreen customers. The District’s source water is mainly imported from the South Bay Aqueduct, Lake Del Valle, and San Luis Reservoir, which all draw water from the Sacramento – San Joaquin Delta watershed. The District’s local water sources include Anderson and Calero Reservoirs. From these reservoirs, water is pumped to the Santa Teresa Water Treatment Plant in San José. For additional information about the District’s supplies, please visit the district website.

Hetch Hetchy ReservoirNorth San José / Alviso
The San Jose Municipal Water System purchases a blend of Hetch Hetchy water and treated water from San Francisco Public Utilities Commission (SFPUC) and delivers it to our Alviso and North San José customers. The Hetch Hetchy Watershed provides most of the total SFPUC water supply, with the rest supplemented by local watersheds in Alameda and Santa Clara Counties. The major water source originates from spring snowmelt flowing down the Tuolumne River and is stored in the Hetch Hetchy Reservoir.

The Alameda Watershed spans more than 35,000 acres in Alameda and Santa Clara Counties. Surface water from rainfall and runoff is collected in the Calaveras and San Antonio Reservoirs. Prior to distribution, water from the watershed is treated at the Sunol Valley Water Treatment Plant (SVWTP). Fluoridation, chloramination, and corrosion control treatment are provided for the combined Hetch Hetchy and SVWTP water at the Sunol Chloramination and Fluoridation Facilities.

Edenvale & Coyote Valley
Groundwater from deep water wells provides 100% of the supply in the San Jose Municipal Water System’s Edenvale and Coyote Valley service areas. The Santa Clara Valley Groundwater Basin provides about half of the County’s water supply for potable use, through pumping by retail water agencies or individual well owners. The quality, supply, and management of this local groundwater basin is monitored by the Santa Clara Valley Water District.