| Quick facts | Answer |
|---|---|
| Cost range | About $50 to $250 per assembly |
| Time | Varies by assembly; confirm with the pro |
| Who's qualified | State-certified backflow prevention tester with SCDES certification |
Johns Island, SC: what's different here
Johns Island sits in Charleston County, South Carolina, and is about 12 miles from Charleston, roughly 19 minutes by car on the main highway. The island has a humid subtropical climate with long hot, humid summers and mild winters, and freezing temperatures are uncommon. Many homes here are built on slab or crawl-space foundations rather than basements, which affects how easily backflow assemblies can be reached.
Who is allowed to perform backflow testing in Johns Island?
In South Carolina, all backflow testing must be performed by a state-certified backflow prevention tester. Certification is issued through SCDES and expires every 3 years. South Carolina recognizes four tester categories: General Tester, Limited Tester, Inspector Tester, and Manufacturer's Agent.
How often does a backflow assembly need to be tested?
South Carolina rules require each backflow assembly to be tested after installation and before use by the customer. Routine testing is required at least once annually, and testing is also required after repairs. Exceptions apply only in specific cases.
What equipment must the tester use?
SCDES says tester gauges must be accurate to within 2% of full gauge scale or within +/- 0.3 psi differential. Backflow tester equipment and gauges must be certified or calibrated annually. Ask the pro whether their gauges are current.
What tests and assemblies are covered?
A certified tester must recertify by passing a written exam and performing prescribed tests on an RP, DCVA, and PVB assembly. Fire protection sprinkler system backflow tests must follow applicable NFPA standards.
What to do next
- Ask the pro for proof of state backflow tester certification and check it is current on the SCDES list.
- Confirm the pro is licensed and insured and request copies of both before the test.
- Ask the quote to list each assembly by type (RP, DCVA, or PVB) and the price per assembly.
- Ask whether the test report will be filed and when the next annual test is due.
- 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.
