What is backflow?

Backflow is the reversal of the normal flow of water. It's caused by pressure differences and can allow contaminants from an irrigation system, boiler, or other sources to enter a home or building's plumbing system or the public water supply. Backflow prevention devices protect plumbing systems and our public water supply by preventing backflow.

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1. I received a letter saying my annual backflow test is due. What do I need to do?
2. Why are backflow preventers tested annually?
3. Do Backflow Testers work for City of Alamogordo Utilities Department?
4. How do I know if I need to install a backflow preventer?
5. What is backflow?
6. What is a cross connection?
7. What causes backflow?
8. How does City of Alamogordo Water System prevent backflow?
9. What can I do to protect my home plumbing system from backflow?
10. What is the backflow administration fee?
11. A backflow preventer was already installed when I moved into this commercial space, but I don't think I need it. What should I do?
12. I'm a renter, why did I receive a letter about the backflow preventer?
13. I received a letter saying I need to install a backflow preventer. How do I do that?
14. Examples of common sources of cross connection hazards are listed below (this is not intended to be a complete list):