South San Joaquin Irrigation District

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The South San Joaquin Irrigation District (SSJID), located in Southern San Joaquin County, California, is a non-profit utility that provides irrigation water and domestic water in the Central Valley of California along with hydroelectric power.

SSJID was establishing in 1909 to provide irrigation water for 72,000 acres of agricultural area surrounding Escalon, Ripon, and Manteca, California. In 2005, it started providing domestic water service to South San Joaquin County cities with its membrane filtration water treatment plant.

SSJID’s historic water rights allow for several hydroelectric power plants on a series of dams and reservoirs on the Stanislaus River. SSJID and Oakdale Irrigation District completed the original Melones Reservoir in 1926. Since 1957, the two agencies have co-owned the Tri-Dam Project, consisting of Donnells Dam, Beardsley Dam, and Tulloch Dam reservoirs and powerhouses.