California Water Service
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.
The information in this report includes the source of your water, whether your water meets EPA standards, detailed tables of detected contaminants, detailed descriptions of those contaminants, possible reasons why they're present, and potential health effects (if any).
Read the Consumer Confidence Report for San Jose main water system here:
Contact California Water Service Customer Service
Have a Question, Issue or Comment?
Main Customer Service
866-734-0743 (Mon–Fri, 7:00 AM–5:30 PM)
"No email provided. Please visit the contact form." (https://www.calwater.com/customercare/phone-numbers/)
Emergency (24 hours - broken water main or pipeline, etc.)
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 City 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 City has made it pretty simple with the following online form. Starting service generally takes just two business days.
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.