Water reservoir in the foreground with trees and lake and sky in the background

Water Quality

Our Commitment to Quality

San Jose Water is committed to supplying water that meets or surpasses all state and federal drinking standards. Browse the sections below to get information on water quality topics.

In addition, you can find a summary of our most recent water testing results along with other important information in our Annual Water Quality report.

Download a copy of the 2019 report here.

San Jose Water employee checking water outlet


Learn more about PFAS and how SJW is addressing it.

Staff member adjusting backflow device


"Backflow" is the reversal of flow of a liquid, gas, or suspended solid into the potable water supply. Find out more about backflow and how we prevent it.

PFAS – What’s in my water?

Updated June 22, 2020

Our top priority at San Jose Water is delivering safe, high-quality and reliable water service to our customers and communities. We immediately discontinued the use of two of our wells at Malone Road Station upon discovering concentrations of perfluorooctane sulfonate (PFOS), a manmade substance widely used in consumer products from carpeting to Teflon pans. All affected customers have been notified by letter.

Water Contaminant FAQ

Read up on water contaminants and how we manage them.


What is fluoride and how does it affect your water? See answers to these questions as well as the fluoridation levels in your area.

Water Supply FAQs

Where does your water come from? Find out here.

Water Heaters

Get tips on water heater maintenance and more.

Hard & Soft Water FAQs

See what "hard" and "soft" water mean, and how to tell that either flow through your pipes.

Safety + Quality FAQs

Get answers to frequently asked questions about the quality of our water.

Water Pressure

Understand high and low water pressure, and how to manage both.

Color, Sediment, Taste & Odor FAQs

Many factors affect your water. See answers to frequently asked questions about its attributes.