What the Testing Involves
A certified tester will:

1. Shut off the water supply and install test gauges on the backflow preventer.
2. Check internal valves and pressure differentials to ensure they’re functioning within required specs.
3. Look for leaks, pressure drops, or failed check valves.
4. Document the results and report them to the local water authority (often annually or after repairs).

Common Places Where It’s Required

• Commercial buildings

• Irrigation systems

• Fire sprinkler systems

• Medical and lab facilities

• Any property with cross-connections between potable and non-potable water

Legal Requirements

Most municipalities require annual testing by a certified backflow tester, and failing to comply can result in water service being shut off or fines.