Charleston, MO Radon Mitigation and Testing

Q: What EPA Radon Zone is Charleston in?

Charleston is in Mississippi 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.

Mississippi County

EPA Zone 3

Positioned in southeastern Missouri's Mississippi County, Charleston sits within the Mississippi River floodplain where alluvial soils typically produce lower radon levels compared to areas with bedrock closer to the surface. The community's housing includes both historic structures and newer homes, many built on slab foundations common to flood-prone areas. Although comprehensive testing data isn't available, individual home testing remains the best way to assess radon risk.

Charleston, MO Radon Mitigation

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

Charleston, MO 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 63834 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Mississippi County, MO

Zip Code

63834

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Charleston and the 63834 zip code are located in Mississippi 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, MO

What EPA Radon Zone is Charleston in?

Charleston and the 63834 zip code are in Mississippi 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 Missouri

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

City	Avg User Radon Level	Submissions
Troy	8.50 pCi/L	4
Lees Summit	7.00 pCi/L	3
Columbia	3.00 pCi/L	2
House Springs	7.00 pCi/L	1
Kansas City	7.00 pCi/L	1
Springfield	7.00 pCi/L	1
Independence	5.00 pCi/L	1
Wentzville	No submissions	0