| Quick facts | Answer |
|---|---|
| Cost range | Varies by property - confirm in your quote |
| Time | Certification course is 4 days; the test itself varies |
| Who's qualified | A state-certified backflow prevention tester with a current certification card |
Johns Island, SC: what's different here
Johns Island is in Charleston County, South Carolina, about 12 miles and roughly 19 minutes by car from Charleston via the main highway. The Johns Island CCD covers 75.7 square miles with 22,013 residents, a low-density suburban and rural service area. As a Charleston-area island community, humidity, storms, and salt-air exposure are relevant conditions for outdoor irrigation backflow devices like pressure vacuum breakers.
Who can legally perform pressure vacuum breaker testing in Johns Island?
South Carolina requires all backflow testing to be done by a state-certified backflow prevention tester. A certified tester holds an up-to-date certification card issued by the Department. Ask the pro for proof of this certification before the test.
How does a tester stay certified in South Carolina?
Certification is valid for 3 years before recertification is required. Renewal requires a passing score of 70% on a written exam, plus hands-on tests on a double check valve assembly, a pressure vacuum breaker, and a reduced pressure principle assembly.
What tester types does South Carolina recognize?
State regulations recognize four certified tester types: General Tester, Limited Tester, Inspector Tester, and Manufacturer's Agent. Each earns certification after a proctored practical exam and a written exam. Verify the tester's card is current before scheduling.
How accurate must the test equipment be?
South Carolina requires tester gauges to be accurate within 2% of full scale or plus/minus 0.3 psi differential. This ensures pressure vacuum breaker test results are reliable. A qualified pro will use properly calibrated gauges.
Where can testers in the Charleston area get certified?
The SC DES backflow tester certification course is a 4-day class with written and hands-on evaluation. A Charleston-area class is listed at the North Charleston Convention Center with dates of June 9-12, 2026. Check the SC DES backflow program list for current offerings.
What to do next
- Confirm whether your property has a backflow prevention assembly that must be tested under South Carolina rules and local water-system requirements.
- Ask the tester to show a current backflow prevention assembly tester certification card issued by the Department.
- Request a quote that states the cost and which assembly will be tested, such as your pressure vacuum breaker.
- Verify the tester's gauge is accurate within 2% of full scale or plus/minus 0.3 psi differential.
- 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.
