Why should I be concerned about backflow?

Backflow can be a health hazard if contaminated water is drawn back into your water supply's plumbing system and is used for drinking, cooking, or bathing. Furthermore, unprotected cross-connections with water supply plumbing or public drinking water piping systems are prohibited by law.

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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?