Locations and reports
Radon Levels in Minnesota
What this means for you
- Your area: EPA rates 68 of Minnesota's 87 classified counties Zone 1, the highest of its three radon zones. Zones are predictions for whole counties, and homes with elevated levels occur in all three zones.
- Local tests: CDC publishes Minnesota's radon test results by county. Open your county below to see its figures.
- Your home: The only way to know your home’s level is to test it.
pCi/L (picocuries per liter) is the unit radon is measured in. EPA recommends fixing a home at 4 pCi/L or above, its action level.
For Minnesota, EPA's Map of Radon Zones places 68 of its 87 classified counties in Zone 1, highest predicted potential, a prediction for each county as a whole. Radon levels vary from home to home, so only a test measures the level in yours.
Predicted: EPA radon zone
87 of 87 counties classified
EPA classifies counties, not states. Of the 87 counties in Minnesota with a zone, 68 are in Zone 1 and 19 in Zone 2.
- Zone 1: Highest predicted potentialgreater than 4 pCi/L68 of 87 counties · 78.2%
- Zone 2: Moderate predicted potential2 to 4 pCi/L19 of 87 counties · 21.8%
An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
CDC publishes Minnesota's radon test figures by county: 87 of its 87 counties have one. Each county's share is in the county list.
Minnesota, In figures
Minnesota in figures
What the published data says about Minnesota, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places 68 of Minnesota's 87 counties in Zone 1 and 19 in Zone 2.
Zone 1 counties, A to Z, begin with Becker County, Big Stone County and Blue Earth County; the county section below lists all 68.
Compared
Calculated by Radon41178% of Minnesota's counties with a zone on file are in Zone 1, a larger share than across all U.S. counties (34%). It is a share of counties, not of land, people or homes.
Reported tests
MeasuredCDC has no statewide testing figure for Minnesota on file here.
87 of the 87 counties have a published county figure; the most tests in each one's latest year were reported for Hennepin County (4,489 in 2023), Dakota County (1,593 in 2023) and Ramsey County (1,420 in 2023).
Local record
Minnesota's radon program is the MDH Indoor Air Unit, run by MN Dept. of Health; its contacts are under Local resources.
6 cities have a page setting the figures of the counties it lies in side by side: Plymouth, St. Paul, St. Cloud, Duluth, Mankato and Eagan.
Minnesota, State data
Minnesota's own radon test data
MeasuredWhat Minnesota's own agencies publish about radon tests, with their publisher and period. These are not CDC's figures and are never added to them.
What the Minnesota Department of Health reports for Minnesota
Radon Testing (MN Public Health Data Access Portal): home radon tests reported voluntarily by private laboratories and licensed radon measurement professionals, counted by property. Period: 2016-2025.
Share with one or more tests at or above 4 pCi/L
36.2%
94,719 properties tested with one or more tests at or above 4 pCi/L
Median result
2.8 pCi/L
Average result
3.8 pCi/L
Tests behind these figures
26,137 properties tested a year on average
- MDH says these data do not include all of the radon tests conducted in Minnesota.
- Post-mitigation tests are excluded from the averages and the median; the percentages use each property's highest test.
- Each home is unique and can have very different results than a neighbor's home; the only way to know is to test.
- These figures describe tests reported to the Minnesota Department of Health in this area. They count a different set of tests than CDC's figures and are not a reading of any one home.
Measured: Minnesota Department of Health data, 2016-2025.
Minnesota, Counties
Minnesota counties by EPA zone
PredictedAll 87 counties, by the zone EPA predicts for each. Every county has its own report.
Zone 1: highest predicted potential68
- Becker County52.2% of reported tests at or above 4 pCi/L, 2023
- Big Stone County61.1% of reported tests at or above 4 pCi/L, 2023
- Blue Earth County32.7% of reported tests at or above 4 pCi/L, 2023
- Brown County63.5% of reported tests at or above 4 pCi/L, 2023
- Carver County34.6% of reported tests at or above 4 pCi/L, 2023
- Chippewa County65.7% of reported tests at or above 4 pCi/L, 2023
- Clay County65.0% of reported tests at or above 4 pCi/L, 2023
- Cottonwood County50.0% of reported tests at or above 4 pCi/L, 2023
- Dakota County34.6% of reported tests at or above 4 pCi/L, 2023
- Dodge County63.2% of reported tests at or above 4 pCi/L, 2023
- Douglas County48.3% of reported tests at or above 4 pCi/L, 2023
- Faribault County70.0% of reported tests at or above 4 pCi/L, 2023
- Fillmore County53.4% of reported tests at or above 4 pCi/L, 2023
- Freeborn County67.6% of reported tests at or above 4 pCi/L, 2023
- Goodhue County49.5% of reported tests at or above 4 pCi/L, 2023
- Grant County72.7% of reported tests at or above 4 pCi/L, 2023
- Hennepin County32.0% of reported tests at or above 4 pCi/L, 2023
- Houston County47.8% of reported tests at or above 4 pCi/L, 2023
- Hubbard County46.0% of reported tests at or above 4 pCi/L, 2023
- Jackson County52.3% of reported tests at or above 4 pCi/L, 2023
- Kanabec County28.0% of reported tests at or above 4 pCi/L, 2023
- Kandiyohi County65.1% of reported tests at or above 4 pCi/L, 2023
- Kittson County25.0% of reported tests at or above 4 pCi/L, 2023
- Lac qui Parle County73.9% of reported tests at or above 4 pCi/L, 2023
- Le Sueur County62.2% of reported tests at or above 4 pCi/L, 2023
- Lincoln County54.2% of reported tests at or above 4 pCi/L, 2023
- Lyon County65.0% of reported tests at or above 4 pCi/L, 2023
- Mahnomen County54.5% of reported tests at or above 4 pCi/L, 2023
- Marshall County9.1% of reported tests at or above 4 pCi/L, 2023
- Martin County43.2% of reported tests at or above 4 pCi/L, 2023
- McLeod County55.7% of reported tests at or above 4 pCi/L, 2023
- Meeker County49.2% of reported tests at or above 4 pCi/L, 2023
- Mower County45.1% of reported tests at or above 4 pCi/L, 2023
- Murray County72.0% of reported tests at or above 4 pCi/L, 2023
- Nicollet County45.7% of reported tests at or above 4 pCi/L, 2023
- Nobles County58.5% of reported tests at or above 4 pCi/L, 2023
- Norman County37.5% of reported tests at or above 4 pCi/L, 2023
- Olmsted County46.1% of reported tests at or above 4 pCi/L, 2023
- Otter Tail County61.4% of reported tests at or above 4 pCi/L, 2023
- Pennington County53.3% of reported tests at or above 4 pCi/L, 2023
- Pipestone County71.4% of reported tests at or above 4 pCi/L, 2023
- Polk County60.0% of reported tests at or above 4 pCi/L, 2023
- Pope County50.9% of reported tests at or above 4 pCi/L, 2023
- Ramsey County23.5% of reported tests at or above 4 pCi/L, 2023
- Red Lake County50.0% of reported tests at or above 4 pCi/L, 2023
- Redwood County54.8% of reported tests at or above 4 pCi/L, 2023
- Renville County75.7% of reported tests at or above 4 pCi/L, 2023
- Rice County40.4% of reported tests at or above 4 pCi/L, 2023
- Rock County42.4% of reported tests at or above 4 pCi/L, 2023
- Roseau County22.2% of reported tests at or above 4 pCi/L, 2023
- Scott County41.4% of reported tests at or above 4 pCi/L, 2023
- Sherburne County21.7% of reported tests at or above 4 pCi/L, 2023
- Sibley County60.0% of reported tests at or above 4 pCi/L, 2023
- Stearns County46.7% of reported tests at or above 4 pCi/L, 2023
- Steele County51.4% of reported tests at or above 4 pCi/L, 2023
- Stevens County34.5% of reported tests at or above 4 pCi/L, 2023
- Swift County41.7% of reported tests at or above 4 pCi/L, 2023
- Todd County23.8% of reported tests at or above 4 pCi/L, 2023
- Traverse County85.7% of reported tests at or above 4 pCi/L, 2023
- Wabasha County42.3% of reported tests at or above 4 pCi/L, 2023
- Wadena County40.0% of reported tests at or above 4 pCi/L, 2023
- Waseca County60.3% of reported tests at or above 4 pCi/L, 2023
- Washington County21.3% of reported tests at or above 4 pCi/L, 2023
- Watonwan County66.7% of reported tests at or above 4 pCi/L, 2023
- Wilkin County48.1% of reported tests at or above 4 pCi/L, 2023
- Winona County38.8% of reported tests at or above 4 pCi/L, 2023
- Wright County42.4% of reported tests at or above 4 pCi/L, 2023
- Yellow Medicine County73.7% of reported tests at or above 4 pCi/L, 2023
Zone 2: moderate predicted potential19
- Aitkin County38.7% of reported tests at or above 4 pCi/L, 2023
- Anoka County19.3% of reported tests at or above 4 pCi/L, 2023
- Beltrami County40.7% of reported tests at or above 4 pCi/L, 2023
- Benton County23.3% of reported tests at or above 4 pCi/L, 2023
- Carlton County41.9% of reported tests at or above 4 pCi/L, 2023
- Cass County25.5% of reported tests at or above 4 pCi/L, 2023
- Chisago County34.9% of reported tests at or above 4 pCi/L, 2023
- Clearwater County54.5% of reported tests at or above 4 pCi/L, 2023
- Cook County12.5% of reported tests at or above 4 pCi/L, 2023
- Crow Wing County30.5% of reported tests at or above 4 pCi/L, 2023
- Isanti County22.7% of reported tests at or above 4 pCi/L, 2023
- Itasca County26.3% of reported tests at or above 4 pCi/L, 2023
- Koochiching County50.0% of reported tests at or above 4 pCi/L, 2023
- Lake County3.8% of reported tests at or above 4 pCi/L, 2023
- Lake of the Woods County50.0% of reported tests at or above 4 pCi/L, 2022
- Mille Lacs County33.3% of reported tests at or above 4 pCi/L, 2023
- Morrison County35.5% of reported tests at or above 4 pCi/L, 2023
- Pine County39.6% of reported tests at or above 4 pCi/L, 2023
- St. Louis County20.2% of reported tests at or above 4 pCi/L, 2023
Minnesota, Cities
Cities in Minnesota with their own page
Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.
Minnesota, Local resources
Local resources in Minnesota
Who to ask in Minnesota: the state's radon program, test kits and professionals.
MDH Indoor Air Unit
MN Dept. of Health
Minnesota’s radon program answers questions about testing, mitigation and the rules where you live.
- Phone
- 651-201-4601
- health.indoorair@state.mn.us
- Licensing of radon professionals
The Radon Licensing Act requires anyone who performs a radon test or radon mitigation, in a building they do not own or lease, must be licensed by MDH.
- Disclosure when a home is sold or rented
The Minnesota Radon Awareness Act requires specific disclosure and education be provided to potential home buyers during residential real estate transactions in Minnesota.
Test kits
Ask the program whether it has free or discounted kits, or compare kits you can buy.
Radon professionals
7 professionals are listed in Minnesota.
Professionals in MinnesotaMinnesota, Questions
Questions about radon in Minnesota
Common questions9 questions, answered from the figures above
Is radon a problem in Minnesota?
EPA's Map of Radon Zones places 68 of the 87 Minnesota counties it classifies in Zone 1, the highest predicted potential, 19 in Zone 2 and 0 in Zone 3. An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
Who does radon mitigation in Minnesota?
Radon411's Minnesota directory lists 7 certified radon companies. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional.
How radon mitigation worksWhat mitigation costsRadon professionals in Minnesota
How do I get a radon test in Minnesota?
EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. The Minnesota radon program is the place to ask about certified testers and any test kit offer it runs.
How to test a homeFree and low-cost kits by stateMinnesota radon program
Which Minnesota counties are in EPA radon Zone 1?
68 counties are in Zone 1: Becker County, Big Stone County, Blue Earth County, Brown County, Carver County, Chippewa County, Clay County, Cottonwood County, and 60 more in the county table on this page. Zone 1 is EPA's class for highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. A zone is a prediction for a county, not a measurement of any home.
Radon in Becker CountyRadon in Big Stone CountyRadon in Blue Earth County
Which Minnesota counties have the highest radon?
87 of Minnesota's 87 counties have an EPA radon zone published here. Radon411 will not rank counties on data it does not hold, and a zone is a prediction for an area rather than a measurement of any building.
What share of radon tests in Minnesota are high?
CDC has published no statewide radon testing statistics for Minnesota, so we cannot give a figure. Where CDC does publish one, the percentage describes radon tests reported to CDC, not homes.
Which EPA region is Minnesota in?
Minnesota is in EPA Region 5: Great Lakes.
Do I need to test my home in Minnesota?
Yes, wherever you live in the state. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L.
Why does this page show coverage rather than one radon level for Minnesota?
A statewide figure averages counties with very different geology and very different numbers of reported tests, so it hides more than it shows. The county report is the level at which the EPA zone, the geologic potential and the reported testing statistics are actually published, which is why the county table above links to every one of them.
What these figures mean if you own, buy, sell or rent
The zone counts on this page describe counties across Minnesota. They are predictions for areas, and none of them measures your building.
- How to test a home
If you own your home
Test the lowest lived-in level; a short-term kit screens in days, a long-term kit reflects the year.
- Buying a house: radon guide
If you are buying
Ask for past results and any system's post-mitigation test, and test during the sale.
- Selling a house: radon guide
If you are selling
Testing before you list puts the timing in your hands; disclosure rules differ by state.
- Radon in rental homes
If you rent, or rent out a home
A tenant can test; a fix is the owner's to make, and duties differ by state.
How long a test has to run, under what conditions, and what EPA says a result means: the testing standard, in full.
Minnesota, Products
Testing and mitigation products
Whatever the figures for Minnesota show, only a test tells you about one home.
Testing
- Short-term test kitsPassive detectors exposed for a few days under closed-building conditions, then analyzed by a lab.
- Long-term test kitsDetectors exposed for more than 90 days, for a closer picture of the annual average.
- Continuous monitorsPowered devices that log radon on a repeating cycle, often used for transaction tests.
- Digital detectorsConsumer devices that display a running radon reading without a lab.
- Water radon testsKits for radon dissolved in well water, analyzed by a lab.
Mitigation
- Mitigation fansThe inline fan that keeps a soil depressurization system running, sized by the installer.
- System indicatorsU-tube manometers and fan alarms that show whether a mitigation system is still working.
- Sealing materialsCrack, joint and sump sealing used alongside a mitigation system, not instead of one.
Minnesota / Next steps
What to do next
Learn
Know what radon is
What radon is, how it gets indoors, and why a county zone is not a reading for your home.
Learn about radonTest
Test the building you live in
Short-term or long-term, where the device goes, and closed-house conditions.
How to testFix
Bring a high level down
How a mitigation system works, and the retest that confirms it.
How mitigation worksFind a pro
Hire a certified professional
Measurement and mitigation professionals by state, with their certifications.
Find a professional
Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.