What is a backflow prevention device (backflow preventer)?

Backflow preventers are mechanical plumbing devices installed in a plumbing system to prevent water from flowing backward in the system. A properly installed, tested and maintained backflow preventer can reliably prevent the backflow of water of an unknown quality from flowing back into the public water system.

The installation and maintenance of backflow prevention devices shall be at the expense of the owner or occupant of the premises. If you don’t know if you need a backflow prevention device or if your water supply is protected, call the Cross Connection Control Office at 931-553-2489 for more information.

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1. What is backflow?
2. What is thermal expansion?
3. What can be done about thermal expansion?
4. What is cross-connection?
5. How can backflow be prevented?
6. What is a backflow prevention device (backflow preventer)?