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 source 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. I'm a renter, why did I receive a letter about the backflow preventer?
3. I received a letter saying I need to install a backflow preventer. How do I do that?
4. Why are backflow preventers tested annually?
5. Do Backflow Testers work for Charleston Water System?
6. Who should I contact for more information?
7. How do I know if I need to install a backflow preventer?
8. What is backflow?
9. What is a cross connection?
10. What causes backflow?
11. How does Charleston Water System prevent backflow?
12. What can I do to protect my home plumbing system from backflow?
13. What is the backflow administration fee?
14. A backflow preventer was already installed when I moved into this home / commercial space, but I don't think I need it. What should I do?
15. I don’t use my irrigation system. Do I still have to test and maintain my backflow preventer?