Winthrop, MN Radon Levels

Q: What EPA Radon Zone is Winthrop in?

Winthrop is in Sibley County, EPA Zone 1.

Q: How much does radon mitigation cost in Winthrop?

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

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

Winthrop, MN Radon Facts

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

County Sibley County, MN

Zip Code 55396

Located in south-central Minnesota's Sibley County, Winthrop sits on deep glacial drift deposits over sedimentary bedrock formations characteristic of the region's agricultural landscape. The small town's housing stock consists mainly of older residential construction with full basements, reflecting Minnesota's traditional building practices for cold climate durability. Since comprehensive radon testing data is not available for zip code 55396, local homeowners should consider testing given Minnesota's geological conditions and basement construction prevalence.

7.17

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 7.17 pCi/L, based on 12 tests from 10 nearby cities. No readings have been submitted for Winthrop yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Winthrop, 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 Winthrop, MN

No homeowner tests have been submitted for Winthrop 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
Stewart	13.2 mi	4.00 pCi/L	1
Nicollet	20.8 mi	2.00 pCi/L	1
Hutchinson	24.3 mi	7.50 pCi/L	2
Sleepy Eye	25.3 mi	12.00 pCi/L	1
Mankato	29.5 mi	14.00 pCi/L	1
New Prague	38.9 mi	9.00 pCi/L	2
Montgomery	39.6 mi	5.00 pCi/L	1
Victoria	41.2 mi	4.00 pCi/L	1

Sibley County Radon Profile

Because of its underlying geology, Sibley County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Direct test data for Sibley County remains limited, so the closest neighboring readings are used here to represent the radon conditions homeowners are likely to encounter. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Sibley County home regardless of zone or a neighbor's results.

Radon FAQ for Winthrop, MN

What EPA Radon Zone is Winthrop in?

Winthrop and the 55396 zip code are in Sibley 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 Winthrop?

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

Radon mitigation in Winthrop 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 Winthrop?

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.