Backflow testing & repair in Millbrae, CA
BackflowCare tests backflow prevention assemblies in Millbrae (San Mateo County) and files the results with City of Millbrae Water. Millbrae’s backflow testing falls under San Mateo County Environmental Health’s cross-connection control program. If a device fails, we make minor repairs and file the passing retest with City of Millbrae.
- County
- San Mateo County
- Water supplier
- City of Millbrae Water
- Annual test
- City of Millbrae: owner hires a certified tester
- Our price
- $199 per device ($25 off for new customers), or from $180/year on a plan
- ZIP codes
- 94030
What City of Millbrae requires in Millbrae
- In the San Mateo County program, only a County-certified backflow tester may test assemblies.
- Assemblies must be tested at least once a year, and again after installation or repair.
- The tester sends the test report to County Environmental Health within 10 calendar days.
- Late testing can bring administrative fines of up to $500 per day, per assembly.
Source: San Mateo County Environmental Health cross-connection program (official page), checked October 19, 2026.
Backflow questions from Millbrae property owners
Which water supplier serves Millbrae?
City of Millbrae Water supplies water in Millbrae (ZIP 94030) and runs its backflow program.
Who tests backflow devices for City of Millbrae customers in Millbrae?
Millbrae’s backflow testing falls under San Mateo County Environmental Health’s cross-connection control program.
When is the backflow test due in Millbrae?
The tester sends the test report to County Environmental Health within 10 calendar days.
Does City of Millbrae charge its own fee in Millbrae?
Yes. Late testing can bring administrative fines of up to $500 per day, per assembly. That fee is separate from our $199 test price.