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Radon Levels in Roseau County, Minnesota

EPA puts Roseau County in Zone 1, its highest radon zone, and only 9 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    29.2%

    14.2 pts below MN

    Roseau
    29.2%
    Minnesota
    43.4%

    48 tests, 2008 to 2017

  • Median result

    3.0pCi/L

    Below action level

    Roseau
    3.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    48

    85th of 85 by tests

    Roseau
    48
    Hennepin
    35,213

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Minnesota

    77 of 85

    Lowest quarter

    Roseau
    29.2%
    Rock
    83.8%

    By share, of 85 with 30+ tests

Read a result for Roseau County

Starts at Roseau County's median, 3.0 pCi/L

3.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 3.0 pCi/L

Between 2 and 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Roseau County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Roseau County, At a glance

Roseau County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Roseau County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: Moderate across 75% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Roseau County, 2023

Share of reported tests at or above 4 pCi/L, by year, Roseau County
Share of reported tests at or above 4 pCi/L, by year, Roseau County
YearShare of reported tests at or above 4 pCi/L
201428.6%
201555.6%
201618.2%
201725.0%
201811.4%
201940.0%
202033.3%
202126.1%
202221.7%
202322.2%

2023: 22.2%. Across these years the share ran from 11.4% to 55.6%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 9 tests were reported to CDC for Roseau County over 2023, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.

Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).

How to read these figures

Roseau County, Compared

Roseau County radon figures, compared

Calculated by Radon411

Roseau County's 48 reported tests over the 2008 to 2017 laboratory totals had a middle value of 3.0 pCi/L and a maximum of 28.3 pCi/L, and 29.2% reached 4 pCi/L. Minnesota as a whole (87 Minnesota counties, pooled) comes to 43.4%: 14.2 points higher than here.

The newest figure, in 2023, counts only 9 tests (22.2% at or above 4 pCi/L), too few to compare, so this reading uses the 48-test figure.

Among its state's counties it ranks 77th of 85 Minnesota counties with 30 or more tests for the same period. Statewide for the same period, Rock County reported the highest share (83.8%) and Anoka County the lowest (17.4%).

Below the action level, 18 tests (37.5%) came in under 2 pCi/L, against 27.4% statewide, and 16 tests (33.3%) fell between 2 and 4, against 29.2% statewide. The busiest year on file was 2018, with 44 tests reported; the quietest, 2023, had 9.

EPA's 1993 zone map puts Roseau County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 75% of the county's land moderate radon potential.

Next door, the shares run from 41.9% in Beltrami County to 55.6% in Marshall County.

Roseau County against Minnesota, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Roseau County
Roseau County4829.2%3.0 pCi/LThis county
Minnesota, pooled87 counties, pooled130,91243.4%Not pooled+14.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+6.5 points
Rock Countyhighest in the state21083.8%7.7 pCi/L+54.6 points
Anoka Countylowest in the state5,95817.4%1.9 pCi/L−11.8 points
Marshall County, MNborders it9955.6%5.4 pCi/L+26.4 points
Beltrami County, MNborders it58041.9%3.4 pCi/L+12.7 points
Kittson County, MNborders it2330.4%2.2 pCi/L+1.2 points
Lake of the Woods County, MNborders it714.3%2.5 pCi/L−14.9 points
Where Roseau County's reported results fell, 2008 to 2017, laboratory, beside Minnesota and the United States
ResultRoseau County testsRoseau County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L1837.5%27.4%39.6%+10.1 points
2 to 4 pCi/L1633.3%29.2%24.7%+4.1 points
4 pCi/L and above1429.2%43.4%35.7%−14.2 points
Roseau County ranked among the 85 Minnesota counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Chisago County72 of 8590431.9%2.6 pCi/L
Washington County73 of 856,05431.5%2.7 pCi/L
Benton County74 of 8548530.7%2.8 pCi/L
Aitkin County75 of 8522630.5%2.5 pCi/L
Ramsey County76 of 859,61230.5%2.7 pCi/L
Roseau County77 of 854829.2%3.0 pCi/L
Crow Wing County78 of 851,16327.9%2.4 pCi/L
Mille Lacs County79 of 8528227.7%2.5 pCi/L
Koochiching County80 of 8514424.3%1.6 pCi/L
Pine County81 of 8523124.2%2.3 pCi/L
St. Louis County82 of 854,60823.7%2.0 pCi/L
Roseau County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
2023922.2%1.8 pCi/L5.4 pCi/L34.6%+0.5 points
20222321.7%1.3 pCi/L8.1 pCi/L31.6%−4.4 points
20212326.1%1.4 pCi/L7.7 pCi/L33.1%−7.2 points
20201833.3%3.3 pCi/L8.9 pCi/L31.8%−6.7 points
20191040.0%2.3 pCi/L8.7 pCi/L36.1%+28.6 points
20184411.4%0.6 pCi/L8.8 pCi/L38.3%−13.6 points
20171225.0%3.7 pCi/L8.0 pCi/L38.2%+6.8 points
20163318.2%2.3 pCi/L7.8 pCi/L37.0%−37.4 points
2015955.6%4.8 pCi/L7.0 pCi/L43.6%+27.0 points
20141428.6%1.9 pCi/L22.6 pCi/L42.9%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Roseau County, State data

Minnesota's own radon test data

Measured

What Minnesota's own agencies publish about radon tests in Roseau County, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What the Minnesota Department of Health reports for Roseau County

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

29.6%

32 properties tested with one or more tests at or above 4 pCi/L

Median result

2.2 pCi/L

Average result

2.9 pCi/L

Tests behind these figures

11 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.

Roseau County, Geology

The ground under Roseau County

Predicted

Most of the ground under Roseau County is one class on USGS's geologic map: 75.4% of its land is moderate radon potential, with 24.5% high. The map puts 75.4% of Roseau County in the area it calls Lake Agassiz Plain/Central Lowland-Western Lake Section and 24.5% in Lake Agassiz Plain. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 15, in the high band (12 to 17).

USGS's geologic areas under Roseau County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Lake Agassiz Plain/Central Lowland-Western Lake SectionSilty and clayey glacial deposits and lake deposits.Moderate1075.4%
Lake Agassiz PlainSilt and clay deposits of Glacial Lake Agassiz derived from Cretaceous shales containing higher than average amounts of uranium.High1524.5%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Roseau County beside the ground around it

Minnesota as a whole has more high-potential ground than Roseau County: 61.1% of its land, against 24.5% here. Of the 4 counties that border it, 2 have more high-potential ground, Kittson County the most at 89.1%.

Share of land by USGS radon potential: Roseau County, the 4 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Roseau CountyZone 1None75.4%24.5%
Lake of the Woods CountyZone 2None77.8%22.0%
Marshall CountyZone 1None32.7%67.3%
Kittson CountyZone 1None10.8%89.1%
Beltrami CountyZone 2None94.7%5.3%
Minnesota87 counties, pooled by land areaVariesNone38.9%61.1%

The map rates the ground, not the air in any home.

Local help

Roseau County, Local resources

Radon testing and mitigation in Roseau County

What Minnesota's program says
Phone
651-201-4601
Email
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.

What it means

Roseau County, Questions

Questions about radon in Roseau County

Are radon levels high in Roseau County?

In 2023, 22.2% of the radon tests reported to CDC for Roseau County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 85 Minnesota counties with 30 or more tests for the same period, 76 reported a higher share; pooled, the state comes to 43.4%.

Which counties border Roseau County?

Roseau County borders 4 counties: Lake of the Woods County, Marshall County, Kittson County and Beltrami County.

Products

Roseau County, Products

Testing a home in Roseau County

In Roseau County, 29.2% of 48 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 43.4% pooled across Minnesota. In Zone 1 the year-round level in Roseau County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Roseau County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Roseau County

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Roseau County, Bordering counties

Counties bordering Roseau County

Calculated by Radon411

Roseau County, Cities and towns

Cities and towns in Roseau County

Roseau County's population has barely moved since 2020: 15,246 residents on July 1, 2025 against 15,298 then, by the Census Bureau's estimates. Spread over its land, that is 9.1 people to the square mile. No town dominates: Roseau, the largest, has 2,685 residents, 17.6% of the total. Reported testing is thin here: 48 tests over 2008 to 2017, or 3.1 for every 1,000 residents (2025 estimate), where Minnesota as a whole comes to 22.5.

From Roseau to Strathcona, CDC publishes no figure by town: each reads Roseau County's.

The cities and towns in Roseau County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Roseau2,685−2.0%17.6%
Warroad1,976+8.3%13.0%
Greenbush675−0.9%4.4%
Badger414−3.5%2.7%
Rooseveltextends beyond Roseau County147−3.3%Counted whole
Strathcona27−3.6%0.2%

6 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Roseau County is counted whole, so it has no share.

Roseau County, Homes

Homes in Roseau County

Of Roseau County's 7,188 homes, 69% are detached houses, against 66% across Minnesota; 14% are mobile homes. Half of its homes were built before 1981, close to Minnesota's 1978: 22% date from before 1960 and 21% from 2000 or later. Owners live in 81% of the occupied homes (Minnesota: 72%), so for most households a test and a fix are their own to order.

Homes in Roseau County, Minnesota, 2019 to 2023
HomesRoseau CountyMinnesota
Housing units7,1882,519,538
Detached houses69%66%
In buildings of 5 or more11%19%
Mobile homes14%3%
Built before 196022%29%
Built since 200021%22%
Middle year built19811978
Owner-occupied81%72%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.