Which component’s performance is evaluated by a field test per local codes using a certified tester?

• A. Backflow preventer
• B. Drip emitter
• C. Regulator
• D. Flow meter

Answer: (A)

Field testing is used to verify that devices protecting the potable water supply function correctly, and this is required by many local codes to be performed by a certified tester. The backflow preventer is a critical device that prevents contaminated water from flowing back into the primary supply. A field test checks that the device shuts off properly, seals against leaks, and, for devices like RPZ or double-check assemblies, that the internal check valves and the relief valve operate at their prescribed pressures. The test is typically done with test gauges connected to the device’s test cocks to simulate flow in both directions and ensure no backflow occurs.

Drip emitters, regulators, and flow meters are important components of irrigation systems, but they do not generally require this formal, code-mandated field testing by a certified tester. Their performance is assessed differently (flow rate, pressure, or output characteristics) and not tied to protecting the public water supply in the same way.

So, the component whose performance is evaluated by a field test per local codes using a certified tester is the backflow preventer.