Saint Thomas, MO Radon Levels

Q: What EPA Radon Zone is Saint Thomas in?

Saint Thomas is in Cole County, EPA Zone 2.

Q: How much does radon mitigation cost in Saint Thomas?

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

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

Saint Thomas, MO Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Cole County, MO

Zip Code 65076

Saint Thomas in Cole County sits within central Missouri's Jefferson City Metro area, where Ordovician limestone and dolomite bedrock contribute to the region's moderate-to-high radon potential. The community features rural residential properties and small-town housing, many with full or partial basements typical of Missouri construction practices. Testing data is currently unavailable for this specific area, making professional radon assessment important for homeowners to determine their individual exposure levels.

6.00

pCi/L area average

Above EPA Action Level

Cole County average: 6.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Saint Thomas itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Saint Thomas, 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 Saint Thomas, MO

No homeowner tests have been submitted for Saint Thomas 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
Jefferson City	11.8 mi	6.00 pCi/L	1
Holts Summit	17.2 mi	4.00 pCi/L	1
Gravois Mills	35.5 mi	7.00 pCi/L	1
Sunrise Beach	36.2 mi	5.00 pCi/L	2
Columbia	38.4 mi	3.00 pCi/L	2
Rolla	38.5 mi	4.50 pCi/L	2
Saint Robert	39.0 mi	7.00 pCi/L	1
Waynesville	43.1 mi	7.00 pCi/L	2

Cole County Radon Profile

The soils and bedrock of Cole County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Homeowner-submitted tests from 1 city in Cole County average 6.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Cole County to test, as levels can differ between neighboring homes.

Radon FAQ for Saint Thomas, MO

What EPA Radon Zone is Saint Thomas in?

Saint Thomas and the 65076 zip code are in Cole County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Saint Thomas?

No homeowner radon tests have been submitted for Saint Thomas yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Cole County average—are the best available indicator of local conditions until Saint Thomas 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 Saint Thomas?

Radon mitigation in Saint Thomas 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 Saint Thomas?

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.