How often does a backflow prevention device have to be tested?

• A. Every 48 months
• B. Every 36 months
• C. Every 12 months
• D. Every 24 months

Answer: (C)

Regular testing of backflow prevention devices is required to keep drinking water safe. The standard cadence is to test them once each year, ensuring all components—such as check valves, springs, and diaphragms—are functioning properly and that no leakage could allow backflow into the potable supply. Annual checks catch wear or faults before contamination can occur and align with common codes and cross-connection control programs. After installation or following any repairs, testing is performed, but the routine interval remains yearly. Testing intervals longer than a year leave too much time for unnoticed issues to develop, while more frequent testing is generally not required unless a specific local rule or high-hazard situation calls for it.