Sources of the City of Tracy's water supply include the Delta-Mendota Canal, the Stanislaus River, and groundwater pumped from wells. In 2005, surface water from the Delta-Mendota Canal comprised 50% of the total water supply, or 2.9 billion gallons. Surface water from the Stanislaus River comprised 17%, or 1.0 billion gallons. The groundwater supply comprised 33%, or 1.9 billion gallons of the total water supply.

The Stanislaus River water supply is very soft water and has significantly reduced the minerals in the City's water supply. You may no longer need to use a water softener.