Oaks Water Company
The Great Oaks Water provides water for about 99,199 residents living in the San Jose area. Established in 1960, the Oaks Water collects ground water from 20 wells located throughout the service area, pumped from very pristine aquifers underlying the Santa Clara Plain and Coyote Valley.
San Jose Drinking Water Quality
Consumer Confidence Water Quality Reports
Under the authority of the Safe Drinking Water Act, the EPA requires Oaks Water Company 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 Oaks Water Company Customer Service
Have a Question, Issue or Comment?
Main Customer Service
20 Great Oaks Blvd. Suite 120
San Jose, 95119
844-508-6489 (Mon–Fri, 8:00 AM–5:00 PM)
Emergency (24 hours - broken water main or pipeline, etc.)
Pay Your Great Oaks Water Bill
Already have an account?
If you already have an account, you just need to login to the Great Oaks Water site. Great Oaks Water 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 Great Oaks Water 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 Great Oaks Water. Luckily, San Jose 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 Great Oaks Water, so you don't keep getting billed. Simply fill out the following online form. Stopping service normally takes just two business days.
News & Resources
The Safe Water Drinking Act of 1974 and Water Safety Standards in the United States
Learn all about the water regulations and reasons behind the Safe Drinking Water Act of 1974 passed by Congress to ensure that Americans have clean drinking water.
Traveling Abroad? Seven Countries with the Worst Drinking Water
Sadly, nearly a quarter of the world's population lacks access to clean drinking water. Here's a list of seven countries with the worst water supplies.
How to Store Water Long-Term: An In-Depth Guide to Water Storage
Having enough stored water can be life-saving in the case of an emergency or disaster. Learn how to store water for the long-term with our full guide.
What Is Potable Water? Everything You Need to Know
Are you curious about potable water? About what it is and what makes it so? If yes, check out this complete guide to potable water.
How Is Water Quality Defined? What to Know About the Safety of Your Drinking Water
Levels of bacteria, solid particulates, salinity, and dissolved oxygen — these all affect water quality. Read on to find out more.
Reality Check: How Safe Is the Drinking Water from a Public Fountain?
Many of us drink water from public water fountains without giving it a second thought. But are drinking fountains safe? You may be surprised at the results.