| Quick facts | Answer |
|---|---|
| Cost range | About $50 to $200 per device in Charleston |
| Time | Certification course is four days long |
| Who's qualified | State certified backflow prevention tester with a current Department-issued certification card |
Why DIY double check valve testing isn't legal in Charleston
South Carolina DES says all backflow testing must be done by a state certified backflow prevention tester. A certified tester holds an up-to-date certification card issued by the Department. Homeowners and even plumbers without that card can't legally perform the test.
What you can do yourself
You can visually check the assembly for visible damage, leaks, or freezing and keep the area accessible. You can also track your annual test deadline, since South Carolina requires testing at least once annually. The actual gauge test must be left to a certified tester.
When to call a pro
Call a pro for the required annual test, after any new installation (testing is required before use), or if the device shows leaks or damage. Reports must be filed with applicable fees through Charleston Water System's third-party reporting process. A failed test also needs a certified tester.
What it takes to become a certified tester in South Carolina
Certification requires a four-day course, a proctored practical exam, and a written exam. Renewal is required every 3 years and includes a written exam with a 70% score plus prescribed tests on RP, DCVA, and PVB assemblies. Testers must use a differential gauge accurate within 2% of full scale or plus or minus 0.3 psi.
What to do next
- Schedule the annual DCVA test before your deadline with a state certified tester.
- Ask the tester to show their current South Carolina certification card issued by the Department.
- Get a written quote - Charleston prices typically run $50 to $200 per device.
- Confirm the tester will file your report with the applicable fees through Charleston Water System's third-party reporting process.
- Call (843) 286-4721 or email [email protected] for a free quote from a licensed, insured local backflow tester.
CHS Backflow is a free referral service: an independent contractor does the work and may pay us a referral fee. You never pay us anything.
