Plumbing companies in Sunnyvale, CA
Quick answer
2 plumbing companies have a local office in Sunnyvale, CA on 1-800Deals: Mr. Rooter Plumbing of Sunnyvale - Mountain View and Roto-Rooter Sunnyvale, CA. Sunnyvale's tap water hardness ranges from an average of 57 ppm in SFPUC water to 290 ppm in City well water, according to the City's 2024 Water Quality Report. The City of Sunnyvale has confirmed that its water distribution system contains no lead service lines or galvanized service lines requiring replacement.
Last updated September 28, 2026. Sources are linked below.
Plumbing companies serving Sunnyvale and nearby Santa Clara County communities, with the services and service areas each one lists. We list 2 companies with a local office here:
- Mr. Rooter Plumbing of Sunnyvale - Mountain View, 1098 West Evelyn Ave Suite 104, Sunnyvale. Services include sump pump services, emergency plumbing, sewer repair, plumbing leaks, clogged drains, sewer camera inspection; serves Los Altos, Mountain View, Santa Clara, Sunnyvale.
- Roto-Rooter Sunnyvale, CA, 510 Lawrence Expy, Ste 206, Sunnyvale. Services include drain cleaning, emergency plumber, water heater repair, water damage, commercial plumbing; serves San Jose, Menlo Park, Los Altos, Mountain View, Half Moon Bay, South San Francisco, Millbrae, San Bruno, Hillsborough, Stanford and more.
What to know about plumbing in Sunnyvale
Hardness depends on your neighborhood
Sunnyvale's tap water hardness ranges from an average of 57 ppm in SFPUC water to 290 ppm in City well water, according to the City's 2024 Water Quality Report. The northern part of the city is served with Hetch Hetchy-based water from the San Francisco Public Utilities Commission, the southern portion gets treated Valley Water supply averaging 111 ppm, and six City wells supplement both during summer peaks and emergencies. Dividing by 17.1 converts ppm to grains per gallon, so the range runs from about 3.3 to 17 grains. Check which supply reaches your street before sizing a water softener. Source: City of Sunnyvale: Water Quality Report 2024
No lead service lines found
The City of Sunnyvale has confirmed that its water distribution system contains no lead service lines or galvanized service lines requiring replacement. City staff field verified the material of 1,150 service lines using a state-approved stratified random sampling method, covering both the City-owned line from the main to the meter and the customer-owned line from the meter to the building. California banned lead pipes, fittings and fixtures in 1986. Lead can still come from older faucets and fixtures inside a home, so that is where a plumber should look first. Source: City of Sunnyvale: Lead-free Water Systems
Call the City first on a backup
For a sewer backup, Sunnyvale runs a 24-hour Sewer Response Service at 408-730-7400 and asks residents to call before anyone else. Crews respond within two hours and help identify whether the problem is in the City main or your lateral, which is generally the property owner's responsibility. Where a property line cleanout is installed, the City may clear a blockage on the lower lateral as a courtesy. Root intrusion through cracked joints is a common cause, and repair options are a job for your plumber. Source: City of Sunnyvale: Sewer
Check the license
Plumbing contractors in California hold a C-36 Plumbing Contractor license from the Contractors State License Board. As of 2026, the license is required for any job that needs a building permit, uses employees, or comes to $1,000 or more for labor and materials combined. Check the license number with CSLB's Check a License tool before hiring. Source: official licensing page
Frequently asked questions
Can I drink tap water in Sunnyvale?
Yes. The City of Sunnyvale's 2024 Water Quality Report states that its tap water met all state and federal drinking water health standards that year, and the City has confirmed it has no lead service lines.
Does Sunnyvale have hard water?
It depends on the source. In 2024 SFPUC water averaged 57 ppm of hardness, Valley Water averaged 111 ppm and City well water averaged 290 ppm, roughly 3.3 to 17 grains per gallon.
Who do I call for a sewer backup in Sunnyvale?
Call the City's 24-hour Sewer Response Service at 408-730-7400 before calling anyone else. The City maintains the sewer mains, while the lateral serving your home is generally the property owner's responsibility.
1-800Deals lists companies based on the information they publish; a listing is not an endorsement. Before hiring, check licensing, insurance, reviews and a written estimate.
