Saint Louis, MI Radon Mitigation and Testing

Q: What EPA Radon Zone is Saint Louis in?

Saint Louis is in Gratiot County, EPA Zone 3.

Q: How much does radon mitigation cost in Saint Louis?

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

Gratiot County

EPA Zone 3

Located in Gratiot County in central Michigan's agricultural region, Saint Louis sits on glacial till deposits over sedimentary bedrock formations. The community's housing stock includes both historic downtown structures and suburban developments, many with full basements typical of Michigan construction. Testing data remains limited for zip code 48880, making individual home testing essential for understanding local radon exposure risk.

Saint Louis, MI Radon Mitigation

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

Saint Louis, MI Radon Testing

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

Saint Louis Radon Facts

Key details about the radon risk profile for Saint Louis and the 48880 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Gratiot County, MI

Zip Code

48880

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Saint Louis and the 48880 zip code are located in Gratiot County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Saint Louis, MI

What EPA Radon Zone is Saint Louis in?

Saint Louis and the 48880 zip code are in Gratiot County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Saint Louis?

Radon mitigation in Saint Louis 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 Saint Louis?

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