Commercial Plumber in Sunnyvale, CA

A Property Manager’s Guide to Plumbing in Sunnyvale

Water, sewer and treatment are run by the City

The City of Sunnyvale provides water and sewer service itself; California Water Service serves only a small portion of the city. The City’s wastewater goes to its own Donald M. Somers Water Pollution Control Plant at 1444 Borregas Avenue, a tertiary plant built in 1956 that discharges to San Francisco Bay and supplies recycled water to more than 100 customers. Since 2014 the plant has been under a 20-year upgrade, the Sunnyvale Cleanwater Program. For main breaks, leaks at the meter, low pressure, no water or sewer backups, the City’s 24-hour Water and Sewer Response Service is 408-730-7400; put it on your building’s emergency contact list.

Sewer laterals and service lines

The City maintains the sewer mains through flushing, video inspection, manhole repair and blockage removal. In general, the lateral from the building to the main is the property owner’s responsibility, and so is the water pipe from the meter to the building. For a backup, the City asks owners to call it before anyone else; it helps locate the blockage, and where a property-line cleanout exists it may clear the lower lateral itself. For tree roots and cracked pipe, repairs are the owner’s to arrange.

On older properties, a property-line cleanout and a periodic camera inspection make both the City’s courtesy service and private repairs easier. Lateral work in the street or sidewalk needs a City encroachment permit. See commercial sewer repair.

Restaurants: grease rules in the Municipal Code

Sunnyvale’s sewer use regulations (Municipal Code ch. 12.12) set the grease requirements for food service establishments:

• Grease removal device required: every food service establishment, and any user with grease-generating activities, must install and maintain a City-approved device sized to the Plumbing Code. Interceptors are the default; a grease trap is allowed only by City variance.
• Cleaning frequency: remove the full contents of interceptors and traps at least every six months, sooner if needed. The City can require more frequent cleaning after a grease blockage in the main.
• Grease traps: no food waste disposers or dishwashers connected, and no water over 140°F.
• Records: log each cleaning (date, approximate amount, disposal) and keep records at the facility for 3 years.

Pumping deals with the device; scheduled hydro jetting keeps the kitchen lines leading to it open.

Backflow testing

Sunnyvale’s Cross-Connection Control Program requires backflow assemblies at sites such as multi-use commercial, office and warehouse buildings, fire services, irrigation systems, medical buildings and labs, car washes, laundries and food and beverage plants. Owners must have each assembly tested at least annually, and the City accepts results only from testers on its approved list, who hold a City backflow testing permit. Test reports and administrative questions go to backflow@sunnyvale.ca.gov. The City also offers free inspections through a survey form, and service can be disconnected after repeated requests go unanswered. We install and repair the assemblies these rules require; see backflow preventers.

Permits for commercial plumbing work

Sunnyvale handles all building permits online through E-OneStop Online Services: applications, plan uploads, comments, inspections and payments. The One-Stop Permit Center at City Hall (456 W. Olive Ave., 408-730-7444) offers morning over-the-counter plan check appointments. Larger projects, over 15,000 square feet and $100,000 in valuation, fall under the City’s Responsible Construction Ordinance, with added paperwork before permits and occupancy.

Water heaters: blended hard water and SVCE rebates

Sunnyvale buys SFPUC water for the northern part of the city and Valley Water for the southern part, and supplements both with City wells during summer peaks and emergencies. The 2025 water quality report shows well water averaging 290 ppm hardness (270–310), Valley Water about 97 ppm and SFPUC about 60 ppm. That much hardness builds scale in tanks, tankless heat exchangers and fixtures, so flushing and descaling matter. When it’s time to replace, Silicon Valley Clean Energy offers business rebates for heat pump water heaters, scaled by tank size; the rebate must be reserved before installation, and the claim needs the final permit signed by the City inspector. See commercial water heaters.

Sources

City of Sunnyvale: Water · Sewer · Water Pollution Control Plant · Water quality · 2025 water quality report · Cross-connection control · Commercial backflow requirements · Cross-connection policies and regulations · Municipal Code ch. 12.12, sewer use · Permit Center · Permits. Silicon Valley Clean Energy: Business rebates · About SVCE. Checked October 2026.