Charleston Water System requires all backflow prevention devices to be tested immediately after installation, after repairs of any kind are made, and at least once annually.

To ensure the tests are completed properly, Charleston Water System has developed guidelines for approved testers. All Field Tests must be performed by an Charleston Water System-Approved and DHEC-Certified Tester; for a current list of DHEC certified and Charleston Water System approved testers, click here to visit our list of downloads or call (843) 727-7148.