Sunnyvale has multiple water providers: Sunnyvale Water and Cal Water Los Altos. This page provides information about Cal Water Los Altos.

The California Water Service Company (CalWater) - Los Altos Suburban District provides water for about 70,014 residents living in the area of Los Altos, California. Established in 1931, the California Water Service Company - Los Altos Suburban currently obtains its supply from a combination of local groundwater and imported water, which is treated surface water purchased from the Santa Clara Valley Water District (SCVWD) through SCVWD reservoirs and the San Joaquin-Sacramento River Delta.

Los Altos Drinking Water Quality

Consumer Confidence Water Quality Reports

Under the authority of the Safe Drinking Water Act, the EPA requires California Water Service Company - Los Altos Suburban to assess local water quality each year and distribute a Consumer Confidence Water Quality Report. At WaterZen, we review these reports and make the information available, in a concise, straightforward, and easy-to-understand way.

Excellent

WaterZen Rating

Lead levels in the drinking water of some cities across the United States are too high, potentially creating public-health issues for the people living in those areas.

What about Cal Water Los Altos? How much lead is in your drinking water? And how do those levels compare to other cities in the state? We examined data from hundreds of cities across the nation to understand and grade your water quality.

As you can see, Cal Water Los Altos received the best-possible grade because the amounts of contaminants found in the water supply were better than the Public Health Goal and most other water providers we've analyzed.

Sunnyvale has multiple water providers: Sunnyvale Water and Cal Water Los Altos. This page provides water quality information for Cal Water Los Altos.

Excellent

WaterZen Rating

Lead levels in the drinking water of some cities across the United States are too high, potentially creating public-health issues for the people living in those areas.

Sunnyvale has multiple water providers: Sunnyvale Water and Cal Water Los Altos. This page provides water quality information for Cal Water Los Altos.

Contact California Water Service Company - Los Altos Suburban Customer Service

Have a Question, Issue or Comment?

Main Customer Service

Physical Address:
949 B Street
Los Altos, California 94024

650-917-0152
No email provided. Please visit the contact form. https://www.calwater.com/contact-us/las/

Emergency (24 hours - broken water main or pipeline, etc.)
650-917-0152

Pay Your Cal Water Los Altos Bill

Already have an account?

If you already have an account, you just need to login to the Cal Water Los Altos site. Cal Water Los Altos accepts credit cards, debit, and direct deposit. Click here to login.

Want to create a new account?

You can create a new account on the Cal Water Los Altos website. Once you create the account, you can setup payment with credit, debit, or direct deposit. Click here to create an account.

Want to pay without an account?

You can make a one-time payment without creating an account. You will need to have your credit or debit card in order to make the one time payment. Click here to make a one time payment.

How to Start Sunnyvale Water Service

Starting Your Service

When you move to a new home in Los Altos, you'll most likely already have running water, but you'll still need to set up water service with the Cal Water Los Altos. Luckily, Sunnyvale has made it pretty simple with the following online form. Starting service generally takes just two business days.

Click here to fill out a Start Service Form.

Stopping Your Service

When you move out of a home in Los Altos, you'll need to stop your water service with the Cal Water Los Altos, so you don't keep getting billed. Simply fill out the following online form. Stopping service normally takes just two business days.

Click here to fill out a Stop Service Form.

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