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S San Joaquin Irrigation District building

District Services

South San Joaquin Irrigation District (SSJID) was organized in 1909 to provide irrigation water to southern San Joaquin County. With the completion of the Nick C. DeGroot Water Treatment Plant at Woodward Reservoir in 2005, we now provide drinking water to Tracy, Manteca and Lathrop.

After generating and selling electric power wholesale for over 60 years, SSJID currently is attempting to purchase Pacific Gas and Electric Company’s distribution system in the south county. The goal is to provide safer and more affordable service to Manteca, Ripon, Escalon and adjoining rural areas.