Johns Island, SC Radon Levels
Check local Johns Island radon levels and find certified testing and mitigation professionals to keep your home safe
Johns Island, SC Radon Facts
EPA Radon Zone
Zone 3 — Low Risk
< 2.0 pCi/L (Zone 3)
County
Charleston County, SC
Zip Code
29455
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
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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 in South Carolina with the most user-submitted radon test data, ranked by number of submissions.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Fort Mill | 6.00 pCi/L | 1 |
| Greenville | 5.00 pCi/L | 1 |