Johnston, SC Radon Levels
Check local Johnston radon levels and find certified testing and mitigation professionals to keep your home safe
Johnston, SC Radon Facts
EPA Radon Zone
Zone 3 — Low Risk
< 2.0 pCi/L (Zone 3)
County
Edgefield County, SC
Zip Code
29832
Located in Edgefield County within both the Augusta and Columbia metro areas, Johnston sits on Piedmont crystalline bedrock where radon levels can vary significantly by location. Testing data remains limited for the 29832 zip code, making individual home testing important for understanding specific exposure risks.
Johnston, SC Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Radon FAQ for Johnston, SC
What EPA Radon Zone is Johnston in?
Johnston and the 29832 zip code are in Edgefield 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 Johnston?
Radon mitigation in Johnston 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 Johnston?
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 |