What is the standard method for testing a backflow preventer on a site?

• A. Conduct a field test per local codes using a certified tester, verifying proper operation and no leaks
• B. Visual inspection only
• C. Laboratory chemical analysis
• D. Pressure test after installation without certification

Answer: (A)

Testing on-site backflow preventers should be done as a field test in accordance with local codes, performed by a certified tester. This approach uses a backflow test kit connected to the device’s test cocks to measure pressures and flow, verifying that each check valve seals properly, the relief valve operates at its designated pressure, and there are no leaks when the device is under test. A certified tester has the training to interpret readings, make any necessary adjustments, and document a compliant result that meets regulatory requirements. Visual inspection alone can miss hidden leaks or improper operation, and laboratory chemical analysis isn’t relevant to the device’s mechanical performance. A pressure test after installation without certification may confirm pressure but not prove correct functioning or code compliance. That’s why the standard method is a field test per local codes using a certified tester to verify proper operation and no leaks.