What is a backflow prevention assembly or device?

A backflow prevention assembly or device is a means or mechanism to prevent backflow. The most basic means for preventing backflow is an air gap, which either eliminates a cross-connection or provides barrier from backflow. A safer mechanism for preventing backflow is a mechanical backflow preventer, which provides a physical barrier to backflow. The principal types of backflow preventers are the reduced-pressure principle assembly (RP or RPZ), the pressure vacuum breaker assembly (PVB), the double check valve assembly (DC), and the spill-resistant pressure vacuum breaker assembly.

Show All Answers

1. Why does the City of Forest Lake need a Cross-Connection and Backflow Testing Program?
2. What is backflow?
3. What is a backflow prevention assembly or device?
4. What is the process for installing/replacing a backflow prevention assembly?
5. Why do backflow prevention assemblies need to be tested?
6. How often does the backflow prevention assembly need to be tested?
7. How can I contact a licensed backflow assembly tester/rebuilder?
8. When requesting a test for my backflow prevention assembly, how much should I expect to pay for this service?
9. What type of document needs to be returned to the city as proof that testing of the backflow prevention assembly was completed?
10. How can I verify that testing of my backflow prevention assembly has/has not been completed?
11. Does a lawn irrigation system require a backflow prevention assembly?
12. How long does a backflow prevention assembly last?
13. What is considered a “potential hazard” to the potable water supply?
14. Has the City of Forest Lake process for permitting or overseeing the inspection of new, relocated or repaired backflow prevention changed?
15. What is backpressure backflow?
16. What is back-siphonage?
17. What is a cross-connection?