District Information

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Los Altos
Customer Center
Los Altos Advice Letter Filing Mailing List
949 B Street
Los Altos, CA 94024
8:00 AM to 4:30 PM
(650) 917-0152
Contact us via email
After-Hours Phone Number
(650) 917-0152
Automated Payment Number
(866) 734-0743
Payment Mailing Address
California Water Service
P.O. Box 4500
Whittier, CA 90607-4500
District Manager
Dawn Smithson
Due to COVID-19, all Cal Water Customer Center lobbies are closed to walk-in traffic. Los Altos phone service is scheduled to be available at 8:00 AM today.

If you have a water-related emergency, please contact Cal Water using the Los Altos after-hours phone number.

Serving Los Altos and portions of Cupertino, Los Altos Hills, Mountain View, and Sunnyvale

Cal Water's Los Altos Suburban District was formed in 1931 with the purchase of the Los Altos Water Company. To meet the needs of our customers in Los Altos and parts of Los Altos Hills, Cupertino, Mountain View, and Sunnyvale, we use a combination of local groundwater and imported water. Our imported water, which is treated surface water purchased from the Santa Clara Valley Water District (SCVWD), comes from SCVWD reservoirs and the San Joaquin-Sacramento River Delta. Our water system includes 297 miles of pipeline, 65 booster pumps, and 46 storage tanks. We proactively maintain and upgrade our facilities to ensure a reliable, high-quality supply.

Closest Western Union Pay Stations
Business Address City ZIP Code
Safeway #2814160 1st StLos Altos94022
Safeway #325120620 Homestead RdCupertino95014