Backflow testing for Mid-Peninsula Water District customers
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. BackflowCare tests assemblies for Mid-Peninsula Water District customers in Belmont, and files the results with Mid-Peninsula Water District.
- Area
- San Mateo County
- Cities we serve
- Belmont
- Annual test
- Owner hires a certified tester
- Our price
- $199 per device ($25 off for new customers)
- Mid-Peninsula Water District contact
- Backflow@midpeninsulawater.org, (650) 591-8941
Mid-Peninsula Water District testing rules
- 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.
Mid-Peninsula Water District rules for new and replacement devices
- 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).
Mid-Peninsula Water District backflow questions
Who tests backflow devices for Mid-Peninsula Water District customers?
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.
Which cities does Mid-Peninsula Water District serve?
We serve Mid-Peninsula Water District customers in Belmont.