Name two common backflow preventers used in irrigation and the typical testing requirement.

Name two common backflow preventers used in irrigation and the typical testing requirement.

• A. RPZ (Reduced Pressure Zone) and DCV (Double Check Valve); testing is done by a certified tester, typically annually.
• B. RPZ and PVB; testing monthly.
• C. DCV and AVB; no testing required.
• D. DCV and PVB; tested every five years.

Answer: (A)

The main idea is knowing which backflow preventers are most commonly used in irrigation and how they’re tested. The two you’re most likely to see are an RPZ, which stands for Reduced Pressure Zone, and a DCV, a Double Check Valve assembly. These devices are favored because they provide strong protection against backflow across a range of pressures and cross-connection scenarios, and many local codes specifically require one of these for irrigation systems connected to potable water. Because backflow devices can wear or fail over time, they must be tested after installation and on a regular schedule to confirm they’re sealing properly and stopping backflow. The typical requirement is testing by a certified backflow tester, usually on an annual basis. That combination—RPZ and DCV with annual testing by a certified tester—is the standard practice you’re being asked to recognize. The other options aren’t the standard pairing or testing cadence for irrigation backflow protection. A PVB is used in some systems but is not paired with RPZ as a common two-device standard in many codes, and the idea of monthly testing or no testing at all isn’t aligned with typical practice.

The main idea is knowing which backflow preventers are most commonly used in irrigation and how they’re tested. The two you’re most likely to see are an RPZ, which stands for Reduced Pressure Zone, and a DCV, a Double Check Valve assembly. These devices are favored because they provide strong protection against backflow across a range of pressures and cross-connection scenarios, and many local codes specifically require one of these for irrigation systems connected to potable water.

Because backflow devices can wear or fail over time, they must be tested after installation and on a regular schedule to confirm they’re sealing properly and stopping backflow. The typical requirement is testing by a certified backflow tester, usually on an annual basis. That combination—RPZ and DCV with annual testing by a certified tester—is the standard practice you’re being asked to recognize.

The other options aren’t the standard pairing or testing cadence for irrigation backflow protection. A PVB is used in some systems but is not paired with RPZ as a common two-device standard in many codes, and the idea of monthly testing or no testing at all isn’t aligned with typical practice.