Ismay, MT Radon Mitigation and Testing

Q: What EPA Radon Zone is Ismay in?

Ismay is in Custer County, EPA Zone 1.

Q: How much does radon mitigation cost in Ismay?

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

Custer County

EPA Zone 1

Positioned in Custer County within southeastern Montana's prairie region, Ismay sits atop Fort Union Formation sandstones and shales that can contribute to radon accumulation. While testing data for this small rural community remains limited, Montana's geological diversity makes radon testing advisable for residents in zip code 59336. The area features scattered ranch homes and farmsteads typical of the northern Great Plains.

Ismay, MT Radon Mitigation

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

Ismay, MT Radon Testing

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

Ismay Radon Facts

Key details about the radon risk profile for Ismay and the 59336 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Custer County, MT

Zip Code

59336

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Ismay and the 59336 zip code are located in Custer 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 Ismay, MT

What EPA Radon Zone is Ismay in?

Ismay and the 59336 zip code are in Custer 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 Ismay?

Radon mitigation in Ismay 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 Ismay?

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