How do I know if I need to install a backflow preventer?
Residential customers are only required to install a backflow preventer if the home has an in-ground irrigation system or pool. It is the customer's responsibility to notify us if an irrigation system or pool is installed.

Backflow requirements vary for commercial customers based on the business's water use. Our staff reviews newly established commercial water accounts to assess the degree of backflow hazard and notifies businesses about backflow requirements.

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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?