Helena, MT Radon Mitigation and Testing

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

Based on 3 user-submitted tests, the average radon level is 8.70 pCi/L.

Q: What EPA Radon Zone is Helena in?

Helena is in Lewis and Clark County, EPA Zone 1.

Q: How much does radon mitigation cost in Helena?

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

Avg: 8.70 pCi/L

Lewis and Clark County

EPA Zone 1

3 user tests

Montana's capital city Helena, located in Lewis and Clark County, shows radon levels averaging 8.67 pCi/L based on local testing data, significantly exceeding the EPA action level. The city's location in the Rocky Mountain region, with granite bedrock and mountain valley geology, contributes to elevated radon potential. Homes across zip codes 59601, 59602, and 59626 should prioritize radon testing and mitigation given these concerning levels.

8.70

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Helena, MT Radon Mitigation

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

Helena, MT Radon Testing

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

Helena, Montana Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
12 pCi/L	Helena, MT	51-99 Years	Full Basement	Mar 2024
9 pCi/L	Helena, MT	21-50 Years	Partial Basement	Sep 2017
5 pCi/L	Helena, MT	21-50 Years	No Basement/All Crawl Space	Apr 2017

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

Helena Radon Facts

Key details about the radon risk profile for Helena and the 59601 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Lewis and Clark County, MT

Zip Code

59601

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

8.70 pCi/L

User Tests Submitted

Helena and the 59601 zip code are located in Lewis and Clark 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 Helena, MT

What is the average radon level in Helena, MT?

Based on 3 user-submitted tests, the average radon level in Helena is 8.70 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 Helena in?

Helena and the 59601 zip code are in Lewis and Clark 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 Helena?

Radon mitigation in Helena 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 Helena?

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