Thompson Falls, MT Radon Mitigation and Testing

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.

Avg: 12.00 pCi/L

Sanders County

EPA Zone 1

2 user tests

Thompson Falls is located in Sanders County, Montana. With 2 user-submitted readings averaging 12.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 59873 zip code.

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

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

Thompson Falls, MT Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Thompson Falls, Montana Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Thompson Falls, MT	100+ Years	—	Aug 2024
20 pCi/L	Thompson Falls, MT	0-20 Years	Full Basement	Oct 2019

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

Thompson Falls Radon Facts

Key details about the radon risk profile for Thompson Falls and the 59873 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Sanders County, MT

Zip Code

59873

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

12.00 pCi/L

User Tests Submitted

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

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

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
Great Falls	4.50 pCi/L	2
Whitefish	4.00 pCi/L	2
Ennis	9.00 pCi/L	1
Livingston	No submissions	0