What is a backflow preventer and why are they needed?

A backflow prevention assembly is an approved, testable assembly, which uses valves to prevent potential contaminants from flowing into the drinking water system. Two commonly required devices are the Double Check Valve Assembly (DC) and the Reduced Pressure Zone Assembly (RP). Both of these devices protect drinking water systems from backflow.

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1. What is backflow?
2. What is a cross-connection?
3. What is the most common form of cross-connection?
4. Is Red Oak the only city in Texas enforcing backflow regulations?
5. What is a cross-connection control program or a backflow prevention program?
6. What is a backflow preventer and why are they needed?
7. What is a Customer Service Inspection (CSI)?
8. Who needs a backflow preventer?
9. Must my home or business have backflow prevention?
10. How would a backflow issue occur with a lawn irrigation system?
11. How would a backflow issue occur in a commercial building?
12. Why does a soft-drink dispensing machine require backflow protection?
13. Is my home or my business “grandfathered” in?
14. Why is the City responsible for enforcing the rules, since they are State of Texas (TCEQ) rules?
15. Who is responsible for the testing and maintenance of the backflow prevention assembly?
16. When are backflow devices required to be tested?
17. Why do backflow devices have to be retested?
18. Who do I call to have a test completed?
19. What will a test cost?
20. Who can I contact for more information on backflow prevention?