What is backflow?

Backflow is a reversal of the normal direction of flow in a water system that may result in pollution or contamination of the water. A cross-connection is any arrangement whereby backflow can occur. It can be a temporary or permanent connection in the piping.

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1. What is backflow?
2. What is a backflow prevention device?
3. What is the law?
4. What is the most common form of a cross-connection?
5. Why should I be concerned about backflow?