What is a backflow assembly?

Backflow assemblies are devices placed on cross connections to prevent water from backflowing into the water system. The most common type of backflow assembly is a double check valve assembly, which consists of two independent check valves, two resilient seated valves and testing parts. 

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1. What is a cross connection?
2. How do I know when my assembly needs to be tested?
3. How often do backflow assemblies need to be tested?
4. Do I currently have adequate backflow protection? How can I find out?
5. What is the legal basis for a cross connection control program?
6. What is the responsibility of a building owner, property manager and water supplier?
7. What are some common examples of residential cross connections?
8. What is backflow? Why is backflow protection necessary?
9. What is a backflow assembly?