Public Water Authority
Contra Costa Water District (CCWD)
Serving Central and eastern Contra Costa County, including Concord, Martinez, Pleasant Hill, Walnut Creek, Pittsburg, Antioch, Brentwood, and neighboring communities served by the District’s treated-water system
Population served
198,000 people (California active CWS registry, PWS ID CA0710003; the District also reports wholesale and untreated-water relationships that serve additional communities through separate retail systems)
State system code
FIPS 06
Billing frequency
Bimonthly. CCWD’s EasyPay page calls the water bill bimonthly, and the open-account page says a new customer should expect the first bill within two months.
Provider briefing
How this utility’s billing works
Contra Costa Water District (CCWD) operates as a public water authority serving Central and eastern Contra Costa County, including Concord, Martinez, Pleasant Hill, Walnut Creek, Pittsburg, Antioch, Brentwood, and neighboring communities served by the District’s treated-water system. Customers should use the provider’s current account-specific bill and official customer-service instructions as the final authority for deadlines, balances, and service requests.
The published water-rate framework is described as Uniform usage charge by unit with meter-size daily service charge and an elevation-zone energy charge, rather than increasing residential consumption blocks. Effective February 1, 2026, treated-water usage is $6.98 per unit, where one unit is 748.05 gallons or 100 cubic feet. A typical 5/8-inch meter has a $1.01 daily service charge; 3/4 inch is $1.52/day unless the qualifying inside-sprinkler configuration receives the $1.01 rate. Energy is added per unit by zone, from $0.13 in Zone 1 through $2.37 in Zone 8. Applicable backflow-prevention daily charges and special untreated-water, municipal, irrigation, or demand charges are separate.. Bills are generated bimonthly. ccwd’s easypay page calls the water bill bimonthly, and the open-account page says a new customer should expect the first bill within two months., and a typical residential cost reference is Approximately $78–$98 per month for a typical treated-water 5/8-inch residential account using 5,000–7,000 gallons monthly, assuming the lowest Zone 1 energy charge and no backflow device, special service, or drought charge. At 5,000 gallons (about 6.68 units), the estimated water-only total is about $77.80/month: $30.30 daily service charge, $46.64 usage, and about $0.87 energy. At 7,000 gallons (about 9.36 units), it is about $96.80/month: $30.30 service, $65.32 usage, and about $1.22 energy. CCWD is a water supplier and does not bill one universal District sewer charge; local wastewater agencies or cities may send a separate sewer bill.. These descriptions are useful planning benchmarks; actual charges can change with meter size, usage, sewer averaging, local taxes, drought stages, or account-specific fees.
Wastewater and sewer calculation
A dedicated this detail was not publicly posted. As a CCWD-wide utility calculation. CCWD’s published current-rate schedule covers treated and untreated water supply, daily meter/service charges, usage, energy, backflow, irrigation, and demand charges; it does not publish a District retail wastewater schedule for the CA0710003 CWS. Sewer service is generally provided and billed by the applicable city, sanitary district, or other local wastewater agency, so the customer’s sewer calculation may use a separate water-consumption basis, winter average, flat service charge, or local formula. Customers must identify the wastewater provider for the service address rather than assuming CCWD’s water bill includes sewer.
Meter and infrastructure notes
CCWD’s treated-water accounts are generally read manually every other month for billing; a District staff report describes approximately 61,000 treated-water meters historically read bimonthly, with only a limited AMI pilot/electronic-register deployment rather than universal hourly AMI. The current My Water Report portal provides detailed usage history, household-occupant updates, high-use alerts, and a step-by-step leak-resolution guide. Customers can also purchase a discounted Flume smart-home monitor through CCWD’s 2026 rebate program for minute-level usage visibility, but Flume is a customer-side monitoring device and not the District’s billing meter. Billing remains based on the District meter read and the published unit conversion of 748.05 gallons per 100 cubic feet.
Emergency water support
Report a leak or water emergency
925-688-8374 is the emergency number published on CCWD’s current rate/contact materials. CCWD’s contact page also instructs customers to call 925-688-8000 immediately for street leaks, water-service interruptions, suspicious activity, or other urgent issues and states that the number is monitored 24/7. A report should identify whether the water is in the street, at a hydrant, or on the customer’s property so CCWD can determine whether the District or owner-side line is responsible.
Official starting point
Choose the right next step
Reading this profile
A practical reference for Central and eastern Contra Costa County, including Concord, Martinez, Pleasant Hill, Walnut Creek, Pittsburg, Antioch, Brentwood, and neighboring communities served by the District’s treated-water system
Contra Costa Water District (CCWD) is listed here as a public water authority. The profile separates account actions—such as paying a bill or requesting service—from explanatory material about rates, meters, wastewater, leaks, and delinquency.
Because utility rules can vary by account class, meter size, service address, billing date, and local ordinance, treat the published bill and current provider website as the final authority. Use this profile to locate the correct channel and prepare better questions for customer service.
If your issue is urgent, start with the provider’s emergency number or official payment route rather than waiting for an email response. Keep a written record of calls, confirmation numbers, notice dates, and documents you submit.