Why do backflow preventers have to be tested periodically ?

In order to insure the proper operation of a backflow assembly, it must be tested and certified upon installation and periodically thereafter as required by state code. If the hazard (substance you are protecting against) is considered a high hazard (e.g., a hazard that can cause health problems), the City requires that the device be tested annually.


If the hazard is considered a low hazard (e.g., the hazard effects only the taste and odor of the water), the City requires testing every 3 years. The Texas Commission on Environmental Quality oversees the state requirements. For more information please call 512-393-8010.

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1. What is a cross-connection?
2. What is backflow?
3. What is backpressure backflow?
4. What is back-siphonage?
5. Why does the Water / Wastewater Utilities Department need to control cross-connections and protect its public water system against backflow?
6. What should a water supplier do to control cross-connections and protect their public water systems against backflow?
7. What is a backflow preventer?
8. What is an air gap?
9. What is a reduced pressure zone assembly?
10. What is a double-check valve assembly?
11. What is a hose bibb vacuum breaker?
12. Where can I get more information about cross-connection control?
13. Why do backflow preventers have to be tested periodically ?
14. Why does a soft drink dispensing machine require backflow protection?