Backflow testing & repair in Belmont, CA
BackflowCare tests backflow prevention assemblies in Belmont (San Mateo County) and files the results with Mid-Peninsula Water District. Assemblies must be inspected and tested every year by a tester authorized by San Mateo County; installation, testing and maintenance are the property owner’s responsibility. If a device fails, we make minor repairs and file the passing retest with Mid-Peninsula Water District.
- County
- San Mateo County
- Water supplier
- Mid-Peninsula Water District
- Annual test
- Mid-Peninsula Water District: owner hires a certified tester
- Our price
- $199 per device ($25 off for new customers), or from $180/year on a plan
- ZIP codes
- 94002
What Mid-Peninsula Water District requires in Belmont
- Test tracking and records are handled by San Mateo County Environmental Health Services.
Source: Mid-Peninsula Water District backflow program (official page), checked October 17, 2026.
Rules for new and replacement devices in Belmont
- Hazardous connections need a reduced pressure principle (RP) assembly.
- An RP assembly belongs downstream of the water meter, between the meter and the building’s shutoff valve.
Source: Mid-Peninsula Water District backflow program (official page).
Installing or replacing a device takes a licensed plumbing contractor, usually with a permit. We can refer you to one we trust, test the new device once it’s in, and make minor repairs to existing ones.
Backflow questions from Belmont property owners
Which water supplier serves Belmont?
Mid-Peninsula Water District supplies water in Belmont (ZIP 94002) and runs its backflow program.
Who tests backflow devices for Mid-Peninsula Water District customers in Belmont?
Assemblies must be inspected and tested every year by a tester authorized by San Mateo County; installation, testing and maintenance are the property owner’s responsibility.