| Quick facts | Answer |
|---|---|
| Cost range | $75-$200 per device annually |
| Time | 15 to 30 minutes per device |
| Who's qualified | SC DES-certified backflow prevention tester with current certification card |
James Island, SC: what's different here
James Island is in Charleston County, South Carolina, the county used for local permitting and service lookup. It sits about 6 miles and roughly 10 minutes from Charleston via the James Island Expressway and Folly Road. The area is heavily detached single-family housing, with 92% of units in detached homes and 82% owner-occupied. Flood risk is severe, with 78% of properties likely to be severely affected over the next 30 years.
Who can perform double check valve testing in James Island?
South Carolina requires all backflow testing, including double check valve testing, to be done by a state-certified backflow prevention tester. The tester must hold an up-to-date certification card issued by the Department. Certification is valid for 3 years and must be renewed to remain valid.
How long does a double check valve test take?
A 2026 national cost guide says the testing process typically takes 15 to 30 minutes per device. The tester must use a differential pressure gauge accurate within 2% of full scale or plus or minus 0.3 PSID. Ask the pro we refer to confirm the timing for your specific assembly.
Why is backflow protection relevant on James Island?
James Island has a severe flooding risk, with 78% of properties likely to be severely affected by flooding over the next 30 years. That makes backflow protection especially relevant in the area. Many homes on the island may still need periodic backflow testing.
How does a tester renew South Carolina certification?
Recertification requires a written exam with a passing score of 70%. A South Carolina utility describes the exam as 25 questions plus testing a double check valve assembly in the wet lab using the tester's own gauge. Certification must be renewed every 3 years.
What are the types of certified backflow testers in SC?
South Carolina lists four types of certified backflow testers: General Tester, Limited Tester, Inspector Tester, and Manufacturer's Agent. Ask the pro we refer which certification type they hold. You can verify testers against the state's certification program.
What to do next
- Call CHS Backflow for a free referral to a licensed, insured local backflow tester.
- Ask the pro for proof of a current SC DES backflow tester certification card, valid for 3 years.
- Confirm the quote covers testing your double check valve assembly with a gauge accurate within 2% of full scale or 0.3 PSID.
- Ask whether the $75-$200 quote covers all devices on your property, since pricing is per device.
- 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.
