| Quick facts | Answer |
|---|---|
| Cost range | $70 to $250 per test; annual testing about $75 to $200 |
| Time | About 1 hour for a residential 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, about 12 miles and roughly 19 minutes by car from Charleston via the main highway. The Charleston area has a humid subtropical climate with hot, humid summers and mild winters, which can increase corrosion and wear on plumbing and backflow assemblies. Much of coastal South Carolina, including the Charleston area, has sandy soils and low-lying coastal plain geology that can affect drainage and utility installation conditions. Multiple certified backflow testers are listed in Johns Island, SC 29455.
Who can test backflow in Johns Island, SC?
South Carolina requires all backflow testing to be done by a state certified backflow prevention tester. The state recognizes four tester types: General Tester, Limited Tester, Inspector Tester, and Manufacturer's Agent. A certified tester holds an up-to-date certification card issued by the Department.
How often is backflow testing required?
A backflow prevention assembly must be tested after installation and before the customer uses it. After that, testing follows the recurring schedule set by the water provider or authority having jurisdiction. Ask your utility which deadline applies to your device.
What does a tester need to stay certified?
A tester's license expires every 3 years. Renewal requires a written exam with a passing score of 70% plus performance testing on a reduced pressure principle assembly, a double check valve assembly, and a pressure vacuum breaker. Testers must also use a differential gauge accurate within 2% of full scale or +/- 0.3 psi.
How much does backflow preventer installation cost?
Installation typically runs $200 to $1,800, with most residential jobs falling between $300 and $800. Straightforward installations take 2 to 4 hours, longer if repairs or access issues come up. Testing is a separate cost from installation.
What to do next
- Ask the pro for proof of a state certified backflow prevention tester certification card before the test.
- Confirm with your water provider whether your device needs testing after installation or on a recurring schedule.
- Request a quote that separates testing ($70 to $250) from any repair or installation work.
- Verify the tester uses a differential gauge accurate within 2% of full scale or +/- 0.3 psi.
- 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.
