Johnston, SC Radon Mitigation and Testing

Q: What EPA Radon Zone is Johnston in?

Johnston is in Edgefield County, EPA Zone 3.

Q: How much does radon mitigation cost in Johnston?

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

Edgefield County

EPA Zone 3

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.

Johnston, SC Radon Testing

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

Johnston Radon Facts

Key details about the radon risk profile for Johnston and the 29832 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Edgefield County, SC

Zip Code

29832

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Johnston and the 29832 zip code are located in Edgefield 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 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 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