What is backpressure?

Backpressure is created when a non-drinking water system (such as an irrigation system with a well) is connected into the drinking water system and its pressure exceeds that of the drinking water system. The pressure from this outside system forces the drinking water to reverse its normal flow, which causes the contaminant to flow into the drinking water system. 

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1. What is backflow?
2. What is backsiphonage?
3. What is backpressure?
4. What is a cross-connection?
5. How do you prevent backflow?
6. What is a backflow prevention assembly?
7. I have reclaimed water. Do I need backflow prevention?
8. Who tests and maintains backflow prevention assemblies?