How often should backflow preventers be tested according to plumbing standards?

Backflow preventers play a crucial role in maintaining the safety of potable water supplies by preventing contamination that can occur due to reverse flow of water. According to plumbing standards, specifically following guidelines in the National Plumbing Code of Canada, it is mandated that backflow preventers should be tested annually. This yearly testing ensures that the devices are functioning properly and effectively protecting the water supply from backflow events.

Regular testing is vital because mechanical devices can wear out over time or become damaged, which might not be immediately evident without thorough testing. By adhering to the annual testing requirement, property owners and maintenance personnel can identify and rectify any issues promptly, ensuring continued compliance with public health and safety standards. This practice not only protects individual drinking water systems but also community water supplies, promoting overall public health.