California Water Service Company - Los Altos Suburban System (CWSC Los Altos Suburban)
Los Altos and portions of Cupertino, Los Altos Hills, Mountain View, and Sunnyvale in Santa Clara County
Population reference
69,973 people; 17,170 residential service connections, 1,357 commercial connections, and 3 industrial connections according to California Drinking Water Watch for active system CA4310001.
Billing detail
Broad public detail found
Official destination
Open provider website ↗Provider-specific findings
Billing and account research from public material
Provider-specific research notes are displayed separately from fields that contain only an unavailable-information marker. Read qualifiers in each note and verify current account terms with the provider.
- Billing frequency
- Generally monthly billing, with the bill showing the service period, meter read dates, current charges, due date, and prior balance. The exact read and due-date calendar is premise-specific.
- Rate structure
- CPUC-regulated increasing-block metered residential structure for the Los Altos tariff area, with a fixed monthly service charge plus volumetric charges. The July 1, 2026 Residential Metered Service LAS tariff sets 1-6 CCF at $2.7706 per CCF, 7-20 CCF at $11.0514, 21-30 CCF at $13.8803, and over 30 CCF at $16.5836, plus a $47.56 monthly charge for a 5/8 x 3/4-inch meter; one CCF is approximately 748 gallons. Applicable CPUC fees, surcharges, surcredits, and CAP schedules may also apply.
- Residential cost reference
- Approximately $71.74 for 5,000 gallons and $101.29 for 7,000 gallons on a 5/8 x 3/4-inch meter using the July 1, 2026 LAS residential tariff and 1 CCF approximately equal to 748 gallons. These estimates include the fixed service charge and volumetric water charge but exclude sewer, taxes, CPUC fees, surcharges, surcredits, and any nonstandard meter charges.
- Wastewater and sewer calculation
- Cal Water bills the Los Altos Suburban potable-water charge. Sewer or wastewater charges are normally imposed separately by the applicable Santa Clara County or municipal sewer agency and are not governed by the Cal Water LAS tariff. The sewer agency may use actual water consumption, a winter average, a residential cap, or a fixed equivalent-unit charge. Customers should compare the water meter usage with the separate sewer bill and ask the serving agency for its current base, usage, winter-average, and adjustment rules.
- Meter reading
- The Los Altos Suburban system uses customer water meters and Cal Water's periodic billing reads. Cal Water's 2026 infrastructure plan identifies implementation of advanced metering infrastructure as a future upgrade, but the district page does not establish that every account already has AMI or publish a fixed local route day. Customers should use the bill's read dates and current/previous reads, review usage history in the portal, and ask Cal Water to confirm the exact meter technology and leak-alert capability for the premise. The district reports 297 miles of pipeline, 65 booster pumps, 46 storage tanks, imported treated surface water from Santa Clara Valley Water District, and local groundwater.
- New-account deposit
- Cal Water Rule 6 permits a cash deposit or other approved credit security when an applicant does not establish credit; the exact amount is account- and credit-specific rather than a universal Los Altos Suburban flat amount. Under the reviewed Rule 7 terms, after 12 consecutive months in which at least 10 bills were paid within 15 days after presentation and service was not discontinued for nonpayment, the deposit is automatically refunded as an account credit with applicable interest. A customer re-establishing service after delinquency may need to pay the balance, reconnection charges, and a deposit.
- Activation or transfer fee
- No single universal 2026 routine name-transfer fee is stated on the reviewed Los Altos Suburban district or payment pages. New-service connections, meters, deposits, construction, inspections, and special facilities are governed separately by Cal Water rules and tariffs. Obtain a premise-specific activation, connection, or deposit quote from the Los Altos Suburban District rather than assuming every transfer is free.
Context, not a score
How documentation coverage compares
This profile
100%
overview fields with research notes
California
67%
records with any overview detail
National index
50%
records with any overview detail
Coverage measures what this directory documented. It does not measure service quality, affordability, or regulatory compliance.
Research record
Broad public detail found
7 of 7 fields in this section contain provider-specific public detail in dataset August 1, 2026.
Documented
100%
Primary verification routes
- California Water Service Company - Los Altos Suburban System (CWSC Los Altos Suburban) public website ↗
Provider-controlled destination used to confirm current customer instructions.
- EPA SDWIS / ECHO lookup (CA4310001) ↗
Search the federal drinking-water database using public water system ID CA4310001.