Caledonia, MN Radon Levels

Q: What EPA Radon Zone is Caledonia in?

Caledonia is in Houston County, EPA Zone 1.

Q: How much does radon mitigation cost in Caledonia?

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

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

Caledonia, MN Radon Facts

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

County Houston County, MN

Zip Code 55921

Situated in southeastern Houston County near the Mississippi River bluffs, Caledonia sits within Minnesota's EPA Zone 1 high radon potential area. The region's karst limestone geology and steep topography create conditions favorable for radon gas migration into homes with basements. With limited testing data available for zip code 55921, homeowners should test their properties to understand their individual radon risk.

7.50

pCi/L area average

Above EPA Action Level

Houston County average: 7.50 pCi/L, based on 2 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Caledonia 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+

Caledonia, 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 Caledonia, MN

No homeowner tests have been submitted for Caledonia 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
La Crescent	16.4 mi	7.50 pCi/L	2
Winona	30.2 mi	10.00 pCi/L	1
Minnesota City	34.4 mi	7.00 pCi/L	1

Houston County Radon Profile

Because of its underlying geology, Houston County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 2 cities in Houston County average 7.50 pCi/L across 2 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Houston County home regardless of zone or a neighbor's results.

Radon FAQ for Caledonia, MN

What EPA Radon Zone is Caledonia in?

Caledonia and the 55921 zip code are in Houston 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 Caledonia?

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

Radon mitigation in Caledonia 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 Caledonia?

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.