San Jose has multiple water providers: CalWater - Bakersfield, California Water Service - Dominguez, CalWater (California Water Service) - Visalia, California Water Service - San Mateo, Great Oaks Water, San Jose Water (Edenvale & Coyote Valley), California Water Service, City Of San Jose Water - North San Jose/Alviso, Cal Water - City Of King, California Water Service - Marysville, Cal Water - Oroville, CalWater - Dixon, CalWater - Willows, CalWater - Travis Air Force Base, and Calwater - Salinas Hills, view all. This page provides information about California Water Service - San Mateo.

The California Water Service (Cal Water) provides water for about 101,004 residents living in the Bayshore District, San Carlos area. Established in 1931, the California Water Service collects surface water sources purchased from the San Francisco Public Utilities Commission (SFPUC), which originates from spring snowmelt flowing down the Tuolumne River to storage in Hetch Hetchy Reservoir.

San Jose Drinking Water Quality

Consumer Confidence Water Quality Reports

Under the authority of the Safe Drinking Water Act, the EPA requires California Water Service 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.

B+

Good

WaterZen Rating

Lead and copper 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 California Water Service - San Mateo? How much lead and copper are 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, California Water Service - San Mateo received an above-average grade because the amounts of contaminants found in the water supply were lower than most other water providers we've analyzed.

San Jose has multiple water providers: CalWater - Bakersfield, California Water Service - Dominguez, CalWater (California Water Service) - Visalia, California Water Service - San Mateo, Great Oaks Water, San Jose Water (Edenvale & Coyote Valley), California Water Service, City Of San Jose Water - North San Jose/Alviso, Cal Water - City Of King, California Water Service - Marysville, Cal Water - Oroville, CalWater - Dixon, CalWater - Willows, CalWater - Travis Air Force Base, and Calwater - Salinas Hills, view all. This page provides water quality information for California Water Service - San Mateo.

B+

Good

WaterZen Rating

Lead and copper 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.

San Jose has multiple water providers: CalWater - Bakersfield, California Water Service - Dominguez, CalWater (California Water Service) - Visalia, California Water Service - San Mateo, Great Oaks Water, San Jose Water (Edenvale & Coyote Valley), California Water Service, City Of San Jose Water - North San Jose/Alviso, Cal Water - City Of King, California Water Service - Marysville, Cal Water - Oroville, CalWater - Dixon, CalWater - Willows, CalWater - Travis Air Force Base, and Calwater - Salinas Hills, view all. This page provides water quality information for California Water Service - San Mateo.

Contact California Water Service Customer Service

Have a Question, Issue or Comment?

Main Customer Service

Physical Address:
1720 North First Street
San Jose, California 95112

866-734-0743
"No email provided. Please visit the contact form." (https://www.calwater.com/customercare/phone-numbers/)

Emergency (24 hours - broken water main or pipeline, etc.)
866-734-0743

Pay Your California Water Service - San Mateo Bill

Already have an account?

If you already have an account, you just need to login to the California Water Service - San Mateo site. California Water Service - San Mateo 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 California Water Service - San Mateo 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 San Jose Water Service

Starting Your Service

When you move to a new home in San Jose, you'll most likely already have running water, but you'll still need to set up water service with the California Water Service - San Mateo. Luckily, San Jose 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 San Jose, you'll need to stop your water service with the California Water Service - San Mateo, 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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