What is a backflow prevention device?

This is a device that is installed to protect the potable (drinking) water supply by preventing reversal of flow from a possible source of contamination.  There are several types of devices providing varying levels of protection.

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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?