Charleston, SC Radon Mitigation and Testing

Q: What EPA Radon Zone is Charleston in?

Charleston is in Charleston County, EPA Zone 3.

Q: How much does radon mitigation cost in Charleston?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Charleston County

EPA Zone 3

South Carolina's historic port city spans both Charleston County and Berkeley County, where coastal plain geology typically produces lower radon levels than inland areas. The region's distinctive architecture features many homes built on elevated foundations or over crawl spaces, construction styles that can influence radon accumulation patterns differently than full basement homes. Despite limited current testing data, Charleston-area residents should consider radon testing as part of comprehensive home safety assessment.

Charleston, SC Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Charleston, SC Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Charleston Radon Facts

Key details about the radon risk profile for Charleston and the 29401 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Charleston County, SC

Zip Code

29401

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Charleston and the 29401 zip code are located in Charleston County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Charleston, SC

What EPA Radon Zone is Charleston in?

Charleston and the 29401 zip code are in Charleston County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Charleston?

Radon mitigation in Charleston typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Charleston?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in South Carolina

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Fort Mill	6.00 pCi/L	1
Greenville	5.00 pCi/L	1