Source of Your Water
primary source of water for 500,000 residents of the Contra Costa Water
District in central and eastern Contra Costa County is the Sacramento-San
Map of CCWD
more information on CCWD water quality, Click
from rivers within the Sierra, the water flows into the Sacramento and
San Joaquin rivers, eventually finding its way into the Delta.
water is drawn from Rock Slough near Oakley, Old River near the town of
Discovery Bay and Mallard Slough in Bay Point.
water is transported in the 52-mile Contra Costa Canal, which starts at
Rock Slough, then stretches west to Clyde, south to Walnut Creek and north
CCWD can also store water in the Los
Vaqueros Reservoir south of Brentwood, the Contra Loma Reservoir in
Antioch, the Mallard Reservoir in Concord and the Martinez Reservoir in
Contra Costa Water District treats this water and provides it to about
250,000 residents in Brentwood, Clayton, Clyde, Concord, Pacheco, Port
Costa, and parts of Pleasant Hill, Martinez and Walnut Creek.
also sells untreated water (raw water) from the canal to the cities of
Antioch, Martinez and Pittsburg, the California Cities Water Company (Bay
Point), and the Diablo Water District (Oakley). These five agencies treat,
distribute and bill for the water themselves, serving 250,000 people.
Most of these agencies can also draw groundwater from wells or surface
water from their own reservoirs or the Sacramento or San Joaquin rivers
as supplemental supplies.