| Quick facts | Answer |
|---|---|
| Cost range | Varies by home - confirm in your quote |
| Time | Varies by device - confirm with your tester |
| Who's qualified | A state certified backflow prevention tester with an up-to-date certification card |
Johns Island, SC: what's different here
Johns Island is a rural, coastal neighborhood in Charleston County, about 12 miles and roughly 19 minutes by car from Charleston via the main highway. Homes built in the 1970s and 80s near the Stono River or the Intracoastal Waterway often feature crawl spaces. Tidal creeks, salt marsh, and sandy-to-clay soils that hold moisture affect crawl-space conditions, and the coastal, humid climate leaves properties vulnerable to heavy rainfall and water damage.
Who is qualified to perform sump pump backflow testing?
South Carolina requires all backflow prevention assembly testing to be done by a state certified backflow prevention tester. That means the tester holds an up-to-date backflow prevention assembly tester certification card issued by the Department. The certification lasts 3 years and must be renewed to stay valid.
When does a backflow assembly in Johns Island need to be tested?
South Carolina rules require each backflow assembly to be tested by a certified tester after installation and before the customer uses it. Annual testing is also a typical recurring requirement in South Carolina local utility processes, with results submitted to the utility.
Does sump pump backflow work on Johns Island require a plumbing license?
For backflow device installation on irrigation systems, the installer must hold a South Carolina plumbing license. Separately, residential plumbing work exceeding $500 requires a license under South Carolina Residential Builders Commission rules. Ask any pro for proof of license before work begins.
How do I verify a tester's certification?
South Carolina DES maintains a public listing of certified backflow testers that consumers can use to find testing services. You can also ask the tester to show their up-to-date certification card. Certification cards are issued by the Department and must be current.
What does a certified tester need to do the job?
South Carolina's tester certification requires personal possession of, or an employer-owned, backflow prevention assembly test kit. The Department also approves a training and certification course for testers. A Charleston-area class is listed at the North Charleston Convention Center, with dates shown as June 9-12, 2026.
What to do next
- Check the tester's up-to-date backflow prevention assembly tester certification card before booking.
- Confirm the tester appears on the South Carolina DES public listing of certified backflow testers.
- Ask in your quote whether the test covers the after-installation test required by S.C. Code Regs. § 61-58.7.F.
- If installation is part of the job, ask whether the work exceeds $500 and requires a licensed plumber.
- 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.
