When should backflow prevention devices be inspected?

Backflow prevention devices are critical components in protecting water supply systems from contamination. These devices must be inspected regularly to ensure they function correctly and continue to provide the necessary protection against backflow. Inspecting these devices before and after significant repairs or changes is essential because such activities can impact the integrity and operation of the backflow prevention system.

When significant repairs or changes occur, the environment or the water system may undergo modifications that can affect the performance of the backflow prevention device. Therefore, conducting inspections at these critical times ensures that any potential issues are identified and addressed promptly, helping maintain the water quality and safety standards.

While other frequencies for inspection may seem reasonable, they do not adequately account for the variability and risks associated with new installations and system changes that could jeopardize the effectiveness of the device. Regular inspections tied to system alterations help preemptively identify problems that could lead to contamination, underscoring the importance of option C.