| Quick facts | Answer |
|---|---|
| Cost range | $40 to $85 per sprinkler device; $75 to $250 for fire-sprinkler devices |
| Time | 20 to 30 minutes per device |
| 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 in Charleston County, part of the Charleston metro area on the South Carolina coast. The island sits about 12 miles and roughly 19 minutes by car from Charleston via the main highway. Heavy rain and groundwater movement in this coastal climate can stress backflow protection systems, so annual testing is a realistic minimum maintenance interval here.
Who can do backflow preventer 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 backflow prevention assembly tester certification card issued by the Department. Certifications expire every 3 years.
How does a tester get certified in South Carolina?
The South Carolina backflow tester training course is a four-day course with a hands-on practical exam and a written exam. Recertification requires a passing score of 70% on the written exam. The certification processing fee is $150.00 per certification.
Why test backflow preventers every year in Johns Island?
The Charleston County climate includes heavy rain and groundwater movement that can stress backflow protection systems. That makes annual testing a realistic minimum maintenance interval in this coastal climate.
Where is the nearest tester certification class?
South Carolina DES lists a Charleston training class at the North Charleston Convention Center, with dates shown as June 9-12, 2026. Johns Island is about 12 miles and roughly 19 minutes by car from Charleston via the main highway.
What to do next
- Ask for a quote covering the type of device you have: sprinkler backflow certification runs $40 to $85, fire-sprinkler testing $75 to $250.
- Ask the pro for proof of a state certified backflow prevention tester certification card issued by the Department.
- Check the certification expiration date, since South Carolina tester certifications expire every 3 years.
- Schedule the annual test during dry weather, since heavy rain and groundwater movement stress backflow systems in Charleston County.
- 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.
