What is backpressure backflow?

Back pressure backflow is 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 (i.e. downstream pressure that is greater than the potable water supply pressure) can result from several things: an increase in downstream pressure which can be created by pumps, temperature increases in boilers, etc; a reduction in the potable water supply pressure which can occur whenever the amount of water being used exceeds the amount being supplied, such as during water line flushing, fire fighting, or breaks in water mains; or a combination of both.

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1. What is a cross-connection?
2. What is backflow?
3. What is backpressure backflow?
4. What is backsiphonage?
5. Why do water suppliers need to control cross-connections and protect their public water systems against backflow?
6. What should water suppliers 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 principle assembly (RP)?
10. What is a double check valve assembly (DC)?
11. What is a residential dual check valve (RDC)?
12. Why do backflow preventers have to be tested periodically?
13. Where can I get more information about cross-connection control?