2026-02-27 · 4 min read
Radon Mitigation Cost in South Carolina (2026)
Upstate South Carolina — the Piedmont and Blue Ridge — has significant radon risk. The Lowcountry is low-risk. Mitigation costs $950–$2,100 for most homes.
Radon in South Carolina
Like Georgia, South Carolina's radon story is defined by its geology. The state splits cleanly:
Upstate (Piedmont and Blue Ridge): Greenville, Spartanburg, Anderson, Pickens, Oconee, Cherokee, and York counties sit on granite, gneiss, and schist bedrock. EPA Zone 1 in the foothills, Zone 2 in the broader Piedmont. Readings above 10 pCi/L are not uncommon in the Blue Ridge foothills.
Midlands (Columbia, Sumter, Florence): Zone 2 — moderate. Testing worthwhile, especially in older homes.
Lowcountry (Charleston, Myrtle Beach, Hilton Head): Zone 3 — coastal sedimentary geology produces very little radon. Individual homes can still test elevated.
Cost by Foundation Type
Slab-on-Grade: $950–$1,900
Dominant throughout South Carolina. Upstate homes built in the 1980s–present are mostly slab.
Crawl Space: $2,500–$5,000
Common in older Upstate homes and rural construction throughout the state. The Piedmont's rocky terrain and clay soil can complicate access.
Finished Basement: $1,100–$2,200
Found in some hillside Upstate homes with walkout basements, particularly in Greenville and Spartanburg suburbs.
South Carolina-Specific Factors
Upstate growth: The Greenville-Spartanburg metro is one of the fastest-growing in the Southeast. Good contractor availability and competitive pricing in the urban core.
Lowcountry scarcity: Despite lower risk, Charleston and coastal SC have fewer certified contractors. If you need mitigation, you may wait longer.
No state licensing: South Carolina has no state radon program for contractors. Quality varies — verify NRPP or NRSB credentials before hiring.
South Carolina Resources
- SC Dept of Health & Environmental Control: scdhec.gov (search "radon")
- Verify NRPP: radonproficiency.org
- Verify NRSB: nrsb.org
Frequently Asked Questions
Which parts of South Carolina have the most radon?
Upstate South Carolina — Greenville, Spartanburg, Anderson, and the Blue Ridge foothills — has the highest radon risk due to Piedmont granite and gneiss geology. The Midlands (Columbia area) is moderate Zone 2. The Lowcountry and coastal areas are Zone 3.
How much does radon mitigation cost in South Carolina?
Most Upstate SC homes run $950–$1,900. Coastal and Midlands pricing is similar — the Lowcountry has fewer certified contractors, which can push prices slightly higher.
Does South Carolina require radon contractor licensing?
South Carolina does not have a state radon contractor licensing program. Verify NRPP or NRSB certification.
Find a Certified Mitigator Near You
Every contractor on RadonBase is NRPP or NRSB certified — mitigators only, no testers.
Browse by State →More from the blog
How Much Does Radon Mitigation Cost in 2026?
Slab jobs run $800–$2,500. Crawl spaces are $2,500–$8,000+. Here's the real breakdown by foundation type, region, and what drives costs up.
Read →
Crawl Space Radon Mitigation: Cost, Process, and What to Expect
Crawl space radon jobs cost $2,500–$8,000+ — far more than slab jobs. Here's exactly why, what's involved, and what legitimate contractors include.
Read →
What Is Radon Mitigation? A Homeowner's Complete Guide
Radon is the second leading cause of lung cancer in the US. Learn what radon mitigation is, how it works, and when you actually need it.
Read →