I received a letter saying I need to install a backflow preventer. How do I do that?
We recommend contacting a licensed plumber. You can install it yourself, but it must be installed according to our specifications, and we will inspect it after installation.

If you hire someone to install it, provide him with a copy of the letter and installation guidelines enclosed in the letter.

Once it's installed, you or the installer should contact us to request an inspection. If it passes inspection, the final step is to have it tested by a tester from our List of Approved Backflow Testers.

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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?