Thompson, MO Radon Levels

Q: What EPA Radon Zone is Thompson in?

Thompson is in Audrain County, EPA Zone 2.

Q: How much does radon mitigation cost in Thompson?

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

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

Thompson, MO Radon Facts

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

County Audrain County, MO

Zip Code 65285

Found in Audrain County in north-central Missouri, Thompson occupies an area where Prairie Plains geology and glacial till deposits create moderate radon potential. The small community's housing consists primarily of rural residential properties and older farmsteads, many with partial basement foundations. Given the absence of local testing data for zip code 65285, homeowners should consider professional radon testing to assess individual property risk levels.

4.00

pCi/L area average

Above EPA Action Level

Audrain County average: 4.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Thompson 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+

Thompson, 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 Thompson, MO

No homeowner tests have been submitted for Thompson 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
Mexico	6.8 mi	4.00 pCi/L	1
Hallsville	13.9 mi	5.00 pCi/L	2
Columbia	23.5 mi	3.00 pCi/L	2
Holts Summit	40.5 mi	4.00 pCi/L	1
Boonville	43.6 mi	4.00 pCi/L	1
Jefferson City	46.2 mi	6.00 pCi/L	1
Palmyra	47.1 mi	8.00 pCi/L	1
Hannibal	47.5 mi	6.00 pCi/L	2

Audrain County Radon Profile

Audrain County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. Homeowner-submitted tests from 1 city in Audrain County average 4.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Audrain County.

Radon FAQ for Thompson, MO

What EPA Radon Zone is Thompson in?

Thompson and the 65285 zip code are in Audrain 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 Thompson?

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

Radon mitigation in Thompson 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 Thompson?

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.