Service Area


Total Area of District: 137,127 acres
Population Served: 500,000

Number of Budgeted Employees 298.5 (full-time equivalents)
Capital Assets $1,227,703,854

Water Revenues
Municipal: 19.9%
Industrial: 18.3%
Residential: 47.5%
Commercial: 9.2%
Public Facilities and Other: 5.1%

Retail Treated Water Service
Clayton
Clyde
Concord
Martinez (portion)
Pacheco
Pleasant Hill (portion)
Port Costa
Walnut Creek (portion)

Wholesale Treated Water Customers
Antioch
Brentwood
Golden State Water Company (Bay Point)
Diablo Water District (from jointly owned treatment plant)

Wholesale Untreated Water Service
Antioch
Martinez
Pittsburg

Major Industrial Customers
Andeavor
Shell Oil
Foster Wheeler
Dow Chemical Company
Calpine
USS-POSCO
ECO Services
Eight other smaller industrial customers

Agricultural
25 customers

Untreated Water Supply Facilities
Intakes
Sacramento-San Joaquin Delta water is diverted from four intakes: the Rock Slough Intake near Oakley, the Old River Intake near Discovery Bay, the Middle River Intake on Victoria Canal and the Mallard Slough Intake in Bay Point. Depending on the intake and where water is needed, the water is diverted into the Contra Costa Canal and conveyed to treatment plants and reservoirs located throughout eastern and central Contra Costa County or to Los Vaqueros Reservoir and Contra Loma Reservoir for storage and future use.

Contra Costa Canal
Part of the Central Valley Project, the Contra Costa Canal is the backbone of the Contra Costa Water District, delivering water from the Delta to the District's treatment facilities and untreated water customers. The canal is a 48-mile long facility that starts at Rock Slough, where four stations lift water 124 feet above sea level, and ends at the Terminal Reservoir in Martinez.

After passing through a fish protection barrier and flood protection facility, the canal travels through a short Unlined channel before entering a 1½-mile 10-foot diameter pipeline on its way to the concrete-lined section of the canal in Oakley. Middle River and Old River water is delivered by pipeline either to the Los Vaqueros Reservoir or to the Contra Costa Canal in Antioch where a hydroelectric turbine generates nearly one megawatt of electricity.

Los Vaqueros Conveyance System
Several large diameter buried pipelines transport water from the Middle River and Old River intakes to a Transfer Station outside of Brentwood, where water is then pumped south to the Los Vaqueros Reservoir or travels north to the Contra Costa Canal by gravity.

Reservoirs and Capacities
Martinez Reservoir: 270 acre feet
Contra Loma Reservoir: 2,500 acre feet
Mallard Reservoir: 3,000 acre feet
Los Vaqueros Reservoir: 160,000 acre feet

Treated Water Distribution Facilities
Pipelines: 888 miles
Storage Reservoirs: 41
Pump Stations: 31
Connections: 61,550

Ralph D. Bollman Water Treatment Plant Concord


Conventional treatment (coagulation, flocculation, sedimentation); mixed media GAC (granular activated carbon) filtration; and intermediate ozonation.
Capacity: 75 million gallons per day

Randall-Bold Water Treatment Plant Oakley


Conventional treatment (coagulation, flocculation, sedimentation); dual media GAC (granular activated carbon) filtration; and intermediate and post ozonation.
Capacity: 50 million gallons per day

CCWD/Brentwood Water Treatment Plant Oakley


Conventional treatment (coagulation, flocculation, sedimentation); dual media GAC (granular activated carbon) filtration; and intermediate ozonation.
Capacity: 16.5 million gallons per day
(Note: CCWD built and operates this plant for the City of Brentwood.)