Thompson Falls, MT Radon Levels

Q: What is the average radon level in Thompson Falls, MT?

Based on 2 user-submitted tests, the average radon level is 12.00 pCi/L.

Q: What EPA Radon Zone is Thompson Falls in?

Thompson Falls is in Sanders County, EPA Zone 1.

Q: How much does radon mitigation cost in Thompson Falls?

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

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

Thompson Falls, MT Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Sanders County, MT

Zip Code 59873

Avg. User Level 12.00 pCi/L

User Tests 2

Thompson Falls in Sanders County shows an average radon level of 12.0 pCi/L, significantly exceeding the EPA action threshold and indicating serious radon concerns in this northwestern Montana community. Located along the Clark Fork River valley, the area's glacial deposits and underlying bedrock create conditions conducive to radon accumulation in homes. Properties in zip code 59873 should undergo immediate radon testing and likely require professional mitigation systems.

12.00

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Thompson Falls, MT. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Thompson Falls, MT Radon Mitigation

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Thompson Falls, MT Radon Levels

User-submitted radon test readings from homes in the Thompson Falls area.

Radon Level	City	Home Age	Foundation
4 pCi/L	Thompson Falls, MT	100+ Years	—
20 pCi/L	Thompson Falls, MT	0-20 Years	Full Basement

Have a radon test result for Thompson Falls? Submit your reading to help other homeowners.

Radon FAQ for Thompson Falls, MT

What is the average radon level in Thompson Falls, MT?

Based on 2 user-submitted tests, the average radon level in Thompson Falls is 12.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Thompson Falls in?

Thompson Falls and the 59873 zip code are in Sanders County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Thompson Falls?

Radon mitigation in Thompson Falls 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 Falls?

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 Montana

Cities in Montana with the most user-submitted radon test data, ranked by number of submissions.

City	Avg User Radon Level	Submissions
Butte	10.20 pCi/L	10
Missoula	6.25 pCi/L	8
Florence	11.67 pCi/L	3
Bozeman	10.33 pCi/L	3
Helena	8.67 pCi/L	3
Stevensville	7.67 pCi/L	3
Sidney	7.33 pCi/L	3
Billings	5.33 pCi/L	3
Miles City	3.33 pCi/L	3
Kalispell	7.50 pCi/L	2

Thompson Falls, MT Radon Levels

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

Thompson Falls, MT Radon Facts

Thompson Falls, MT Radon Mitigation

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Thompson Falls, MT Radon Levels

Radon FAQ for Thompson Falls, MT

Most Active Radon Markets in Montana

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