(Bay Area Region)
341 North Delaware Street
San Mateo, CA 94401
7:00 a.m. to 7:00 p.m.
Contact us via email
After-Hours Phone Number
Automated Payment Number
Payment Mailing Address
California Water Service
P.O. Box 4500
Whittier, CA 90607-4500
If you have a water-related emergency, please contact Cal Water using the Bayshore after-hours phone number.
Serving 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.
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.
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.
|Closest Western Union Pay Stations|
|Anchor Drugs||481 Grand Ave||South San Francisco||94080|
|Chavez Supermarket||500 S Norfolk St||San Mateo||94401|
|Fast Money||947 El Camino Real||South San Francisco||94080|
|J & J Check Cashing||220 Cypress Ave||South San Francisco||94080|
|Safeway #0639||100 De Anza Blvd||San Mateo||94402|
|Safeway #0777||30 Chestnut Ave||South San Francisco||94080|
|Safeway #0970||1655 S El Camino Real||San Mateo||94402|
|Sunshine Center Pharmacy||1166 Mission Rd||South San Francisco||94080|