Which professional is qualified to field test all backflow prevention devices?

• A. Licensed Plumber
• B. Building Official
• C. Home Inspector
• D. Certified Backflow Tester

Answer: (D)

Testing backflow prevention devices in the field requires specialized training, precise procedures, and certified authorization. Only a Certified Backflow Tester has demonstrated the knowledge and hands-on skill to test every common device type—such as air gaps, double-check assemblies, and reduced pressure zones—using the proper test equipment, interpreting differential pressures, and documenting the results accurately for compliance with the water supplier and plumbing codes. This credential ensures the tester can reliably determine whether a device is protecting the drinking water and can produce valid test reports.

Licensed plumbers may install or repair backflow preventers, but testing typically requires the specific certification to perform field tests. Building officials and home inspectors assess compliance or condition, but they do not perform the formal field testing and certification of backflow devices.