What is backflow, and why is it dangerous?

Reversal of water flow from an unapproved source to the public water supply. Backflow can carry pollutants and contaminants back into the public water system.

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1. What is backflow, and why is it dangerous?
2. What is an unapproved source?
3. Why is the backflow program needed?
4. What is a backflow prevention (BFP) assembly?
5. What systems require backflow prevention devices?
6. Who can install or test a backflow preventer?
7. Who is subject to the backflow ordinance?
8. Does my backflow preventer need to be placed in an enclosure (hot box)?
9. How often does my backflow device need to be tested?
10. What do I do with the test results?
11. Where do I install the backflow preventer (BFP)?
12. If a new service connection requires a backflow preventer, but it is not installed yet, will a meter be installed?