Johns Island, SC Radon Mitigation and Testing

Q: What EPA Radon Zone is Johns Island in?

Johns Island is in Charleston County, EPA Zone 3.

Q: How much does radon mitigation cost in Johns Island?

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

Located in Charleston County within the Charleston Metro area, Johns Island sits on coastal lowland terrain typical of South Carolina's sea islands. While radon testing data for this zip code 29455 community remains limited, homeowners should still consider testing since radon can accumulate in homes regardless of coastal geography.

Johns Island, SC Radon Mitigation

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

Johns Island, SC Radon Testing

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

Johns Island Radon Facts

Key details about the radon risk profile for Johns Island and the 29455 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Charleston County, SC

Zip Code

29455

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Johns Island and the 29455 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 Johns Island, SC

What EPA Radon Zone is Johns Island in?

Johns Island and the 29455 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 Johns Island?

Radon mitigation in Johns Island 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 Johns Island?

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