Marshall, MI Radon Mitigation and Testing

Q: What is the average radon level in Marshall, MI?

Based on 2 user-submitted tests, the average radon level is 8.50 pCi/L.

Q: What EPA Radon Zone is Marshall in?

Marshall is in Calhoun County, EPA Zone 1.

Q: How much does radon mitigation cost in Marshall?

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

Avg: 8.50 pCi/L

Calhoun County

EPA Zone 1

2 user tests

Centered in Calhoun County in south-central Michigan, Marshall shows an average radon level of 8.5 pCi/L, which significantly exceeds the EPA action threshold. The city's glacial till deposits over limestone bedrock create favorable conditions for radon gas production and accumulation in homes. Residents should prioritize testing and mitigation, as readings have ranged from 4.0 to 13.0 pCi/L in recent tests.

8.50

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Marshall, MI Radon Mitigation

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

Marshall, MI Radon Testing

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

Marshall, Michigan Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
13 pCi/L	Marshall, MI	51-99 Years	Full Basement	Aug 2024
4 pCi/L	Marshall, MI	21-50 Years	Full Basement	Jul 2020

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

Marshall Radon Facts

Key details about the radon risk profile for Marshall and the 49068 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Calhoun County, MI

Zip Code

49068

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

8.50 pCi/L

User Tests Submitted

Marshall and the 49068 zip code are located in Calhoun 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 Marshall, MI

What is the average radon level in Marshall, MI?

Based on 2 user-submitted tests, the average radon level in Marshall is 8.50 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 Marshall in?

Marshall and the 49068 zip code are in Calhoun 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 Marshall?

Radon mitigation in Marshall 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 Marshall?

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 Michigan

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

City	Avg User Radon Level	Submissions
Novi	5.00 pCi/L	7
Rochester	9.00 pCi/L	5
Battle Creek	6.60 pCi/L	5
White Lake	10.00 pCi/L	4
Ypsilanti	8.50 pCi/L	4
Waterford	7.75 pCi/L	4
Howell	7.50 pCi/L	4
Gaylord	6.00 pCi/L	4
Gladstone	5.25 pCi/L	4
West Bloomfield	5.25 pCi/L	4
Clarkston	5.00 pCi/L	4
Flint	9.00 pCi/L	3
Pinckney	7.33 pCi/L	3
Northville	5.33 pCi/L	3
Milford	4.33 pCi/L	3
Plymouth	4.33 pCi/L	3
Portage	3.33 pCi/L	3
Lake Orion	11.00 pCi/L	2
Oxford	11.00 pCi/L	2
Grand Ledge	7.00 pCi/L	2