Billings, MT Radon Mitigation and Testing

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

Based on 3 user-submitted tests, the average radon level is 5.30 pCi/L.

Q: What EPA Radon Zone is Billings in?

Billings is in Yellowstone County, EPA Zone 2.

Q: How much does radon mitigation cost in Billings?

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

Avg: 5.30 pCi/L

Yellowstone County

EPA Zone 2

3 user tests

Montana's largest city in Yellowstone County has recorded an average radon level of 5.33 pCi/L across multiple zip codes (59101, 59102, 59105). This reading exceeds the EPA action level, reflecting Billings' position atop Tertiary sediments and Fort Union Formation rocks along the Yellowstone River valley. Residents throughout the Billings Metro should test their homes and consider mitigation, particularly in properties with basements or lower-level living spaces.

5.30

pCi/L average

Above EPA Action Level

Based on 3 user-submitted radon tests for homes in Billings, MT. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Billings, MT Radon Mitigation

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

Billings, MT Radon Testing

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

Billings, Montana Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Billings, MT	51-99 Years	Full Basement	Oct 2021
8 pCi/L	billings, MT	21-50 Years	Full Basement	Nov 2015

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

Billings Radon Facts

Key details about the radon risk profile for Billings and the 59101 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Yellowstone County, MT

Zip Code

59101

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

5.30 pCi/L

User Tests Submitted

Billings and the 59101 zip code are located in Yellowstone County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Billings, MT

What is the average radon level in Billings, MT?

Based on 3 user-submitted tests, the average radon level in Billings is 5.30 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 Billings in?

Billings and the 59101 zip code are in Yellowstone 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.

How much does radon mitigation cost in Billings?

Radon mitigation in Billings 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 Billings?

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