Radon Mitigation in Northern Minnesota
Northern Minnesota gets described as the state's lower-radon region, and the fine print matters. MDH county test data shows about 3 in 10 St. Louis County properties tested at or above the 4 pCi/L action level, and nearly 6 in 10 at or above 2 pCi/L. Lower than southern Minnesota's numbers, yes. Low, no.
The north's geology is genuinely different: bedrock at or near the surface around Duluth, deep glacial deposits in the lake country around Bemidji, and readings that swing block to block. We connect homeowners in Duluth, Bemidji, and across the north with independent, MDH-licensed contractors for free mitigation quotes.
What Northern Test Data Actually Shows
The EPA zone map rates parts of the north, including Beltrami County, as Zone 2, predicting moderate average levels, while MDH test results keep turning up elevated homes everywhere: about 29.5 percent of St. Louis County properties tested at or above 4 pCi/L in MDH county data. That is why MDH's guidance ignores the zone shading and simply recommends every Minnesota home test. Averages do not protect individual houses.
Source: MDH radon data portalBedrock Country Geology
Duluth sits on the Duluth Complex, ancient igneous bedrock that lies at or near the surface with only thin, patchy glacial soils above it, unlike the deep drift blanketing most of Minnesota. MDH ties radon to uranium decaying in rocks and soil, and in the north the delivery route is often fractures in that shallow bedrock rather than thick sediment. The result is extreme house-to-house variability: a low reading next door means nothing about yours.
Source: Minnesota Geological Survey, glacial geologyHillside Homes, Cabins, and Long Winters
Duluth's hillside stock is heavy on pre-1940 homes with stone and rubble foundations, many stepped into the slope as walkouts. Around Bemidji, converted lake cabins on crawl spaces share the market with newer in-town construction. Both patterns are solvable: older foundations take more sealing and creative routing, crawl spaces get membranes, and the north's long heating season, which MDH notes draws soil gas indoors, makes a verified system worth more here, not less.
Source: MDH radon programNorthern Minnesota Cities We Cover
Start with the service you need, Radon Testing or Radon Mitigation , or go deeper with the guide: Radon Levels by Minnesota County .
Verify Your Contractor's Minnesota Radon License
Before you hire anyone for radon work in Northern Minnesota, check their license. The Minnesota Radon Licensing Act, Minnesota Statutes section 144.4961, requires anyone who performs radon testing, mitigation, or laboratory analysis for compensation to be licensed by the Minnesota Department of Health, and every mitigation system installed under the law must carry an MDH system tag. A licensed professional expects the question. Three things to ask before you sign:
- Can I see your current MDH radon license, and is the company licensed too?
- Will the installed system carry the MDH system tag required under the licensing law?
- Will I get a written, itemized estimate and a follow-up radon test that confirms the system works?
Northern Minnesota Radon Questions
Is radon lower in northern Minnesota?
County averages run lower than southern Minnesota, but MDH county data still shows about 3 in 10 St. Louis County tests at or above 4 pCi/L. MDH recommends testing every Minnesota home regardless of region because individual results vary far more than regional averages do.
Can an old Duluth home with a stone foundation be mitigated?
Yes. Stone and rubble foundations are routine work for licensed mitigation contractors: entry routes get sealed where accessible, the suction point goes through the slab or into a sump, and the pipe routes to keep the discharge above the roofline. The follow-up test proves the result no matter the foundation era.
Where do I get a radon test kit up north?
Beltrami County Public Health offers free kits at its Bemidji office at 616 America Avenue NW, and other county programs are listed in the MDH Local Radon Contacts directory. Winter, with the house closed up, is the ideal testing season per MDH.
Get a Free Radon Mitigation Quote
Tell us about your home and get a free, no-obligation quote from an independent radon mitigation contractor licensed by the Minnesota Department of Health.
Monday to Friday, 8 AM to 5 PM Central