Our Members

SJTA Members

The member agencies of the San Joaquin Tributaries Authority have over 100 years of water operations and watershed management experience on the tributaries of the San Joaquin River (Tuolumne and Stanislaus Rivers).




Turlock Irrigation District: Established in 1887, the TID was the first irrigation district in the state of California. TID delivers irrigation water through over 250 miles of a gravity-fed canal system that irrigates approximately 150,000 acres of farmland and provides retail electricity to a population of 240,000 within a 662 square-mile area. With a push towards innovation, TID has been a leader in new initiatives and data-driven practices to provide value to its customers. www.tid.org




Modesto Irrigation District, established in 1887, is a vertically integrated public utility located in California’s Central Valley. MID provides irrigation water to more than 2,300 agricultural accounts irrigating close to 60,000 acres and electricity to more than 131,000 residential, commercial and agricultural accounts in Modesto, Empire, Salida, Waterford and Mountain House as well as parts of Escalon, Oakdale, Ripon and Riverbank. MID also treats, delivers and wholesales up to approximately 67,000 acre-feet of drinking water per year to the City of Modesto.  www.mid.org.



South San Joaquin Irrigation District (SSJID) in Manteca supplies irrigation water, domestic drinking water and wholesale electric power across a 112 square-mile service area in southeastern San Joaquin County. Established in 1909, SSJID has senior pre-1914 appropriative water rights on Stanislaus River that provide the region’s farms, homes and businesses with added water security and an abundant supply. In 2023, the District maintains a $42 million annual budget. www.ssjid.gov



The Hetch Hetchy Regional Water System, operated by the San Francisco Public Utilities Commission, serves 2.7 million residents and thousands of businesses in the San Francisco Bay Area. With system facilities constructed above Don Pedro Reservoir, we work with Modesto and Turlock Irrigation Districts as partners on the Tuolumne River. www.sfwater.org