Saint Louis, MI Radon Levels

Q: What EPA Radon Zone is Saint Louis in?

Saint Louis is in Gratiot County, EPA Zone 3.

Q: Why are radon readings shown from areas near Saint Louis?

No homeowner radon tests have been submitted for Saint Louis yet, so readings from the closest cities and the Gratiot County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

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.

Check local Saint Louis radon levels and find certified testing and mitigation professionals to keep your home safe

Saint Louis, MI Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Gratiot County, MI

Zip Code 48880

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.

3.00

pCi/L area average

Below EPA Action Level

Gratiot County average: 3.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Saint Louis itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Saint Louis, MI Radon Mitigation

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

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Radon Readings Near Saint Louis, MI

No homeowner tests have been submitted for Saint Louis yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Ithaca	10.0 mi	3.00 pCi/L	1
Saginaw	30.5 mi	12.50 pCi/L	2
Bay City	36.0 mi	2.00 pCi/L	1
Dewitt	40.4 mi	20.00 pCi/L	1
Gladwin	41.9 mi	8.00 pCi/L	1
Frankenmuth	43.0 mi	19.00 pCi/L	1
Flushing	45.2 mi	7.50 pCi/L	2
Saranac	45.8 mi	4.00 pCi/L	1

Gratiot County Radon Profile

Gratiot County is classified as EPA Radon Zone 3, the lowest predicted-risk tier, with modeled indoor screening averages below 2 pCi/L. Homeowner-submitted tests from 1 city in Gratiot County average 3.00 pCi/L across 1 test — below the EPA's 4 pCi/L action level, though radon varies sharply from home to home. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Gratiot County.

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.

Why are radon readings shown from areas near Saint Louis?

No homeowner radon tests have been submitted for Saint Louis yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Gratiot County average—are the best available indicator of local conditions until Saint Louis homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

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.