How often should backflow preventers be inspected and maintained?

Backflow preventers should be inspected and maintained regularly to ensure they are functioning properly. The frequency of inspection and maintenance depends on the type of backflow preventer, system usage, and local regulations. As a general rule, backflow preventers should be inspected annually, and maintenance should be performed every 3-5 years or as recommended by the manufacturer. Regular inspection and maintenance can help prevent failures, ensure compliance with regulations, and protect public health and safety.