Stephen, MN Radon Levels

Q: What EPA Radon Zone is Stephen in?

Stephen is in Marshall County, EPA Zone 1.

Q: How much does radon mitigation cost in Stephen?

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

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

Stephen, MN Radon Facts

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

County Marshall County, MN

Zip Code 56757

Northwestern Minnesota's Stephen sits in Marshall County, where Red River Valley clay soils overlay limestone bedrock formations typical of the region. Testing data for this border community remains sparse, but the underlying geology suggests moderate radon potential. Homeowners in zip code 56757 should prioritize professional testing to determine individual property exposure levels.

8.00

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 8.00 pCi/L, based on 2 tests from 2 nearby cities. No readings have been submitted for Stephen 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+

Stephen, 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 Stephen, MN

No homeowner tests have been submitted for Stephen 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
Thief River Falls	39.1 mi	9.00 pCi/L	1
Crookston	48.2 mi	7.00 pCi/L	1

Marshall County Radon Profile

Because of its underlying geology, Marshall 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 Marshall 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 Marshall County home regardless of zone or a neighbor's results.

Radon FAQ for Stephen, MN

What EPA Radon Zone is Stephen in?

Stephen and the 56757 zip code are in Marshall 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 Stephen?

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

Radon mitigation in Stephen 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 Stephen?

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.