Plains, MT Radon Mitigation and Testing

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

Based on 2 user-submitted tests, the average radon level is 7.00 pCi/L.

Q: What EPA Radon Zone is Plains in?

Plains is in Sanders County, EPA Zone 1.

Q: How much does radon mitigation cost in Plains?

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

Avg: 7.00 pCi/L

Sanders County

EPA Zone 1

2 user tests

Plains in Sanders County shows an average radon level of 7.0 pCi/L, significantly exceeding the EPA action threshold of 4.0 pCi/L. This northwest Montana community (59859) sits in a valley setting where local geological conditions contribute to radon accumulation in homes. The elevated readings from available tests indicate residents should seriously consider radon mitigation, particularly for homes with basement or crawl space foundations.

7.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Plains, MT Radon Mitigation

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

Plains, MT Radon Testing

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

Plains, Montana Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
8 pCi/L	Plains, MT	0-20 Years	No Basement/All Crawl Space	Jun 2025
6 pCi/L	Plains, MT	0-20 Years	No Basement/All Crawl Space	Jun 2023

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

Plains Radon Facts

Key details about the radon risk profile for Plains and the 59859 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Sanders County, MT

Zip Code

59859

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

7.00 pCi/L

User Tests Submitted

Plains and the 59859 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 Plains, MT

What is the average radon level in Plains, MT?

Based on 2 user-submitted tests, the average radon level in Plains is 7.00 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 Plains in?

Plains and the 59859 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 Plains?

Radon mitigation in Plains 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 Plains?

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