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'll find a summary of our most recent water testing results along with other important information in the Annual Water Quality report below. 

PFAS – What’s in my water?

What are PFAS?

PFAS are a group of man-made chemicals that do not break down easily in the environment — even over a period of time. The PFAS family of chemicals include Perfluorooctane Sulfonate (“PFOS”) and Perfluorooctane Acid (“PFOA”). PFOS and PFOA are regulated by the State of California.

These compounds have been widely used in industrial applications since the 1940s including:

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.


"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.