What is backpressure backflow?

Backpressure backflow is backflow caused by a downstream pressure that is greater than the upstream or supply pressure in a public water system or consumer's potable water system. Backpressure can result from an increase in downstream pressure, a reduction in the potable water supply pressure, or a combination of both.

Causes of increases in downstream pressure:

- Pumps (such as wells and booster pumps)

- Temperature increases in boilers, etc.

Causes of decreases in downstream pressure:

- Breaks in water mains

- Fire fighting

- Water line flushing

For more information please call 512-393-8008.

Show All Answers

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?