From Willow Glen to Berryessa, and over the city line into Santa Clara, Campbell, Cupertino and Saratoga: how to find the right figure for your water, wherever you live in this part of the valley.
Water Softener San Jose is an independent referral service, not an installer or plumber. When you send the form with your ZIP code, your details are passed to an independent local water treatment pro who works in your area, who can contact you and prepare a quote.
San Jose neighborhoods
San Jose is a big city, and its water is not the same everywhere. San Jose Water’s 2025 report gives hardness separately for its three sources: about 5.8 grains per gallon on average for Valley Water treated surface water, 9 for mountain surface water and 16.8 for groundwater. Its source map shows which source feeds which area. So a softener sized for a home in one neighborhood may not suit a home in another.
- Willow Glen
- Almaden Valley
- Evergreen
- Berryessa
- Cambrian
- Rose Garden
- Downtown San Jose
- West San Jose
Wherever you are in the city, the steps are the same: check your bill for the company that supplies you, find your area on that company’s report, and use the figure for your source, or a test at your tap, when you ask for a quote.
Nearby towns
Each of these towns has its own page with what to check before you ask for a softener, a filter or a repair.
- Water softener help in Santa Clara: finding who supplies your water and sizing without a published figure.
- Water softener help in Campbell: repairing, servicing or replacing a softener you already have.
- Water softener help in Cupertino: reading San Jose Water’s report, which covers the City of Cupertino system.
- Water softener help in Saratoga: salt or salt-free, sodium, the water heater and adding a filter.
No figure we cannot source
This site prints hardness figures only from a water company’s own report, for that company’s customers. For towns where this site has not read the supplier’s report, it gives no number: ask your water provider for its annual water quality report.
Homes on a private well
Some homes in and around the valley draw water from a private well rather than a water company. If yours does, there is no company report to read: the water is yours to test. EPA says private well owners are responsible for the safety of their water, and that private wells are not regulated under the federal Safe Drinking Water Act. EPA and CDC advise testing at least once a year for total coliform bacteria, nitrates, total dissolved solids and pH, and more often after problems nearby, after any part of the well is repaired or replaced, or if the water’s taste, color or smell changes. Use a state-certified laboratory, ask it to include hardness, and choose any softener or filter from the results.
What to send with the form
The short form asks for your name, phone, ZIP code and the job. The ZIP code is what lets your request reach a pro who works in your area. If you know them, it also helps to mention the company that supplies your water, the source your area is on, and whether you already have a softener or filter.
- New softener, or a replacement for an old one.
- Repair or service of a softener that has stopped keeping up.
- A softener plus a whole-house filter.
- A salt-free system: ask what it is certified for.
- Not sure: describe what you see at the tap.
Pages for each job
Wherever you live, these pages cover the work itself: water softener installation in San Jose, water softener repair in San Jose, reverse osmosis in San Jose, the whole house water filter in San Jose and water filtration in San Jose. Permits differ by city: in San Jose, check with the City of San Jose permit center; in a neighboring town, check with that city.
Send your ZIP code and the job, and an independent local pro can contact you about a quote.
Questions people ask
Do you cover my part of San Jose?
Send the form with your ZIP code. Your request is passed to an independent local pro who works in your area, who can contact you.
Why does the hardness differ between neighborhoods?
San Jose Water draws on three sources with different hardness, and its report has a map of which source feeds which area.
Why is there no hardness figure for my town?
This site prints figures only from a water company’s own report. Ask your water provider for its annual water quality report.