How often should backflow prevention devices be tested?

Backflow prevention devices should be tested annually to ensure they are functioning properly and effectively preventing contamination of the potable water supply. This requirement is crucial as backflow devices play a vital role in safeguarding public health by preventing the reverse flow of potentially contaminated water back into clean water systems. Regular testing helps to identify any malfunctions or wear and tear, allowing for timely maintenance or replacement. Adhering to the annual testing schedule also complies with most local plumbing codes and regulations, which aim to ensure the safety and reliability of water systems.