| Quick facts | Answer |
|---|---|
| Cost range | $85 to $1,200 typical; about $300 for most projects |
| Time | Usually a few hours; complex jobs take longer |
| Who's qualified | South Carolina DES-certified backflow prevention assembly tester; no Contractors' Board license required |
Who can legally replace a backflow preventer in Charleston?
South Carolina DES requires all backflow testing to be done by a state-certified backflow prevention tester who holds an up-to-date certification card. Under state law, repairs to a backflow prevention assembly must be made by a DES certified tester. The state Contractors' Licensing Board does not require a license for this work under its listed DHEC category.
Does replacing a backflow preventer in Charleston require testing or notifications?
Once the assembly is shut down for testing, the appropriate parties must be notified under South Carolina law. That can include the fire department, fire marshal, customer or owner, building official, or insurance company. Ask the pro which notices apply to your property.
What does backflow preventer replacement cost in Charleston?
Installation in Charleston is commonly estimated at $135 to $1,200, with a typical project price of about $300. A broader typical range is $85 to $619. Get itemized quotes from the pros we refer so you know what the price covers.
How does someone become a certified backflow tester in South Carolina?
Certification requires passing both a proctored practical exam and a written exam. South Carolina DES lists a Charleston-area training class at the North Charleston Convention Center, with dates shown as June 9-12, 2026. Verify a tester's certification card is up to date before hiring.
What to do next
- Ask the pro for their current South Carolina DES backflow prevention assembly tester certification card before work starts.
- Request an itemized quote covering removal, replacement parts, the required certified test, and any notifications.
- If the assembly serves a fire sprinkler system, ask who must be notified during shutdown, such as the fire department or insurance company.
- Compare at least two referrals against the typical Charleston range of $85 to $1,200 before booking.
- 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.
