California Water Service - South San Francisco

The California Water Service (Cal Water, Bayshore District - South San Francisco System, provides water for about 62,039 residents living in the area of South San Francisco, California. Established in 1931, the California Water Service - South San Francisco is currently obtaining its supply via the purchase of treated surface water from San Francisco Public Utilities Commission (SFPUC). SFPUC uses water originating from Yosemite National Park snowmelt flowing down the Tuolumne River to storage in the Hetch Hetchy Reservoir and supplemented by Calaveras Reservoir (Alameda and Santa Clara counties), San Antonio Reservoir (Sunol), nearby local watersheds and upcountry non-Hetch Hetchy sources (UNHHS). Also, the District is supplemented with additional water provided by five local groundwater wells that draw water from the aquifer beneath San Mateo.
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South San Francisco Drinking Water Quality

Consumer Confidence Water Quality Reports

Under the authority of the Safe Drinking Water Act, the EPA requires California Water Service - South San Francisco 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.

Contact California Water Service - South San Francisco Customer Service

Have a Question, Issue or Comment?

Main Customer Service

Physical Address:
341 North Delaware Street
San Mateo, 94401

650-558-7800 (Mon–Fri, 8:00 AM–4:30 PM)
No email provided. Please visit the contact form.

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

Pay Your CalWater - South San Francisco Bill

Already have an account?

If you already have an account, you just need to login to the CalWater - South San Francisco site. CalWater - South San Francisco 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 CalWater - South San Francisco 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 South San Francisco Water Service

Starting Your Service

When you move to a new home in South San Francisco, you'll most likely already have running water, but you'll still need to set up water service with the CalWater - South San Francisco. Luckily, South San Francisco 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 South San Francisco, you'll need to stop your water service with the CalWater - South San Francisco, 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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