In-person service is not available at this location; however, our customer service representatives are happy to serve you by phone or email. In-person and other payment options are detailed on the Payment Options page.
Cal Water has completed work on a water infrastructure upgrade in the northeast Portola Valley area that will enhance water supply reliability and fire protection to the Ladera community. As...
Cal Water has started water infrastructure upgrades that will improve water supply reliability and fire protection in South San Francisco. The projects include installation of more than 11,975 linear feet...
Serving Bayshore, Broadmoor, Colma, Daly City, Mid-Peninsula, Palomar Park, San Carlos, San Mateo, and South San Francisco
Cal Water’s Bayshore District was formed in 1931 with the purchase of the South San Francisco Water Company, the San Carlos Water Company, and the San Mateo water system from Pacific Water Company. We proactively maintain and upgrade our facilities to ensure a reliable, high-quality supply.
Our Water Systems
San Carlos
Water for our San Carlos customers is purchased from the City and County of San Francisco (SFPUC). The San Carlos system utilizes 17 storage tanks and 24 booster pumps.
San Mateo
Water for our San Mateo customers is also purchased from the City and County of San Francisco (SFPUC). The San Mateo system has 18 storage tanks and 30 booster pumps.
South San Francisco
Water for our customers is purchased from the City and County of San Francisco (SFPUC), and additional water was provided by five groundwater wells. Our South San Francisco system includes 144 miles of pipeline, 12 storage tanks, one collecting tank, and 21 booster pumps.
Frequently Asked Questions
What forms of payment does Cal Water accept?
You can pay your Cal Water bill with cash, a check, a money order, a credit card, a debit card, or bank account. However, available payment options vary depending on the payment location or method. For more detail, see the Payment Options page.
What is the Customer Assistance Program (CAP)?
Cal Water offers a Customer Assistance Program (CAP — formerly LIRA) to customers who meet income guidelines. Qualifying customers receive a discount on their monthly service charge. You can visit the CAP page to see if you qualify and download an application form. If you live in a single-family residence, you can also apply online.
What should I do if my bill seems higher than usual?
See the High Bills page for more information and suggestions.
How do I turn off the water supply to my house in the event of a break in my plumbing or a repair?
You can interrupt the flow of water to your home by turning off your house valve. House valves are usually located beneath a faucet outside the home, most typically near the faucet for the garden hose. If you cannot find your house valve, please contact your local Customer Center for assistance.
Payment Mailing Address
California Water Service P.O. Box 7229 San Francisco, CA 94120-7229
Automated Payment Number
(888) 598-9824
Rebates
Rates
Customer Assistance: We’re Here to Help
Cal Water has services and programs to assist you in a variety of circumstances.
