Who supplies water in Cupertino?

San Jose Water serves part of the city; the rest is served by another water company.

Is Cupertino water hard?

It varies with the groundwater share, so we test at the tap.

Do you handle remodel plumbing in Cupertino?

Yes, including kitchens, bathrooms and fixture upgrades.

Why is my foothill home's pressure low?

Elevation and the pressure regulator are the first things we check.

Is someone on call for Cupertino overnight?

Yes; phones are answered 24/7 and emergencies are dispatched any hour.

Cupertino, CA · Answered 24/7

Plumber in Cupertino, from the valley floor to the foothills

Cupertino is on the west side of our regular area. Here is who supplies its water and what that means for heaters, fixtures and pipes in Cupertino homes.

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Quick answer

Cupertino is in our regular service area from the North San Jose office, and phones are answered 24/7. San Jose Water serves part of Cupertino with a mix that is more than a third groundwater, which carries more minerals than surface water, so water heaters and fixtures there benefit from regular flushing and descaling.

Who supplies Cupertino's water

San Jose Water serves portions of Cupertino along with San Jose, Santa Clara, Campbell, Los Gatos and Saratoga. Its supply is roughly 55 percent treated imported water bought from Valley Water, 38 percent groundwater from more than 100 wells, and 7 percent local mountain surface water. Groundwater has a higher mineral content than surface water, so the share you get affects scale.

For most Cupertino homes that means a yearly water heater flush is worth doing, and a softener is worth testing for rather than assuming.

Remodels and fixture upgrades

Many Cupertino calls come from remodel work: moving a kitchen sink, adding a bathroom, or replacing fixtures. California requires older homes to bring noncompliant fixtures up to water-conserving standards, and a fixture upgrade is often done alongside kitchen remodel plumbing.

Toward the foothills

Homes toward the foothills on the west side of Cupertino sit at higher elevation, and some of them see lower water pressure than homes on the valley floor. If pressure has dropped everywhere in the house, start with the pressure regulator and the supply line; pressure regulator replacement explains how we test it.

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