Saint Charles, MN Radon Levels

Q: What EPA Radon Zone is Saint Charles in?

Saint Charles is in Winona County, EPA Zone 1.

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

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

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

Saint Charles, MN Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Winona County, MN

Zip Code 55972

Positioned in Winona County near the Mississippi River valley in southeastern Minnesota, Saint Charles falls within EPA Zone 1, indicating high radon potential for the region. Testing data remains limited for the 55972 zip code area, though the area's limestone bedrock and varied soil conditions can contribute to elevated radon levels. Local homeowners should conduct professional radon testing to determine their specific exposure risk.

8.50

pCi/L area average

Above EPA Action Level

Winona County average: 8.50 pCi/L, based on 2 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Saint Charles 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 Charles, MN 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 Charles, MN

No homeowner tests have been submitted for Saint Charles 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
Minnesota City	17.6 mi	7.00 pCi/L	1
Winona	18.1 mi	10.00 pCi/L	1
La Crescent	37.2 mi	7.50 pCi/L	2
Le Roy	37.2 mi	8.00 pCi/L	1

Winona County Radon Profile

The bedrock and soils beneath Winona County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 2 cities in Winona County average 8.50 pCi/L across 2 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. 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 Winona County.

Radon FAQ for Saint Charles, MN

What EPA Radon Zone is Saint Charles in?

Saint Charles and the 55972 zip code are in Winona 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.

Why are radon readings shown from areas near Saint Charles?

No homeowner radon tests have been submitted for Saint Charles yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Winona County average—are the best available indicator of local conditions until Saint Charles 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 Charles?

Radon mitigation in Saint Charles 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 Charles?

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.