What is a backflow prevention assembly?

A backflow prevention assembly is a mechanical valve arrangement, which prevents the reversal of water flow, once it has passed through the valve. There are different types of backflow prevention assemblies for different situations and different degrees of hazard.

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1. What is backflow?
2. How can cross connections and backflow affect my drinking water?
3. What can I do to prevent backflow?
4. What is a backflow prevention assembly?
5. When is a backflow prevention assembly required?
6. What is a Certified Backflow Assembly Tester and how can I find one?
7. What does it cost to test a backflow prevention assembly?
8. What are some different types of backflow prevention assemblies, devices, and methods?
9. Do I need a permit to have a backflow prevention assembly installed and is there a permit fee?
10. Who can install a backflow prevention assembly?
11. What does it cost to install a backflow prevention assembly?
12. Why am I required to have my backflow prevention assembly tested?
13. How often do backflow assemblies need to be tested?
14. Who is responsible for the testing and maintenance of the backflow prevention assembly?