What is the backflow prevention device for or do?

The backflow preventer protects the City water supply. It prevents potentially contaminated water from the customers' water system from flowing backwards into the City’s water supply.

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1. Is the Cross Connection Program new?
2. Why do I own this device?
3. Why is the City following up now about the backflow device?
4. Why is this device required?
5. What is the backflow prevention device for or do?
6. Do I have to do this requirement for my backflow preventer?
7. What if my house is less than two years old?
8. Can I get an extension for my backflow preventer?
9. Where is my backflow preventer located?
10. Is there a list of Certified Backflow Testers?