Charleston, MO Radon Levels

Q: What EPA Radon Zone is Charleston in?

Charleston is in Mississippi County, EPA Zone 3.

Q: Why are radon readings shown from areas near Charleston?

No homeowner radon tests have been submitted for Charleston yet, so readings from the closest cities and the Mississippi County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

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.

Check local Charleston radon levels and find certified testing and mitigation professionals to keep your home safe

Charleston, MO Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Mississippi County, MO

Zip Code 63834

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.

6.75

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 6.75 pCi/L, based on 4 tests from 2 nearby cities. No readings have been submitted for Charleston yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Charleston, MO Radon Mitigation

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

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Radon Readings Near Charleston, MO

No homeowner tests have been submitted for Charleston yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Cape Girardeau	29.1 mi	6.50 pCi/L	2
Jackson	36.7 mi	7.00 pCi/L	2

Mississippi County Radon Profile

Local geology places Mississippi County in EPA Radon Zone 3, where predicted indoor radon averages fall below 2 pCi/L — though no county is risk-free. Few homeowner tests have been logged inside Mississippi County so far, which is why this page draws on the nearest recorded readings to illustrate regional radon levels. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Mississippi County to test, as levels can differ between neighboring homes.

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.

Why are radon readings shown from areas near Charleston?

No homeowner radon tests have been submitted for Charleston yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Mississippi County average—are the best available indicator of local conditions until Charleston homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

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.