Backflow testing & repair in Hillsborough, CA
BackflowCare tests backflow prevention assemblies in Hillsborough (San Mateo County) and files the results with Town of Hillsborough Water. Hillsborough runs its Cross Connection Control Program together with San Mateo County Environmental Health, which sets the testing rules. If a device fails, we make minor repairs and file the passing retest with Town of Hillsborough.
- County
- San Mateo County
- Water supplier
- Town of Hillsborough Water
- Annual test
- Town of Hillsborough: owner hires a certified tester
- Our price
- $199 per device ($25 off for new customers), or from $180/year on a plan
- ZIP codes
- 94010
What Town of Hillsborough requires in Hillsborough
- 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: Town of Hillsborough backflow program (official page), checked October 19, 2026.
Backflow questions from Hillsborough property owners
Which water supplier serves Hillsborough?
Town of Hillsborough Water supplies water in Hillsborough (ZIP 94010) and runs its backflow program.
Who tests backflow devices for Town of Hillsborough customers in Hillsborough?
Hillsborough runs its Cross Connection Control Program together with San Mateo County Environmental Health, which sets the testing rules.
When is the backflow test due in Hillsborough?
The tester sends the test report to County Environmental Health within 10 calendar days.
Does Town of Hillsborough charge its own fee in Hillsborough?
Yes. Late testing can bring administrative fines of up to $500 per day, per assembly. That fee is separate from our $199 test price.