Skip to content
RADON411

Locations and reports

Radon Levels in Beltrami County, Minnesota

EPA puts Beltrami County in Zone 2, its middle radon zone, and high results are common there: 40.7% of the 54 radon tests reported to CDC (2023) came back at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    40.7%

    6.1 pts above MN

    Beltrami
    40.7%
    Minnesota
    34.6%

    54 tests, 2023

  • Median result

    3.0pCi/L

    Below action level

    Beltrami
    3.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    54

    50th of 62 by tests

    Beltrami
    54
    Hennepin
    6,545

    Reported to CDC before any fix, 2023

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Minnesota

    39 of 62

    Middle half

    Beltrami
    40.7%
    Renville
    75.7%

    By share, of 62 with 30+ tests

Read a result for Beltrami County

Starts at Beltrami 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. Beltrami County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Beltrami County, At a glance

Beltrami County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Beltrami County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 95% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Beltrami County, 2023

Share of reported tests at or above 4 pCi/L, by year, Beltrami County
Share of reported tests at or above 4 pCi/L, by year, Beltrami County
YearShare of reported tests at or above 4 pCi/L
201433.3%
201533.5%
201634.7%
201744.6%
201844.0%
201935.3%
202033.8%
202135.6%
202230.0%
202340.7%

2023: 40.7%. Across these years the share ran from 30.0% to 44.6%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 54 tests reported to CDC for Beltrami County over 2023, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not 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

Beltrami County, Compared

Beltrami County radon figures, compared

Calculated by Radon411

In Beltrami County, about 4 in 10 reported tests in 2023 (22 of 54) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 7.3 points higher. Across 86 Minnesota counties pooled together, 34.6% of tests reached that level, so Beltrami County runs 6.1 points above its state.

Of 3 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 25.5% (Cass County) to 46.0% (Hubbard County). By share, Beltrami County is 39th of 62 Minnesota counties with 30 or more tests for the same period.

Year by year, 2014 opened at 33.3% and 2023 closed at 40.7% (up 7.4 points), with 2017 the high at 44.6%. Half the tests came in under 3.0 pCi/L and half over it; the single highest reached 12.0 pCi/L. Below the action level, 12 tests (22.2%) came in under 2 pCi/L, against 36.6% statewide, and 20 tests (37.0%) fell between 2 and 4, against 28.9% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 40.7% share point the same way here. USGS geology rates 95% of the county's land moderate radon potential.

The busiest year on file was 2015, with 236 tests reported; the quietest, 2023, had 54.

Share of reported tests at or above 4 pCi/L by year, Beltrami County against Minnesota2014 to 2023, years with 30 or more tests: Beltrami County 33.3% to 40.7%, the state's pooled share 34.6% in 2023.
Beltrami CountyMinnesota, pooled
Share of reported tests at or above 4 pCi/L by year, Beltrami County against Minnesota: data table
YearTestsBeltrami County, at or above 4 pCi/LMinnesota, pooled
201419833.3%42.9%
201523633.5%43.6%
201622534.7%37.0%
201719544.6%38.2%
201810944.0%38.3%
20198535.3%36.1%
20206533.8%31.8%
202110435.6%33.1%
20226030.0%31.6%
20235440.7%34.6%
Beltrami County against Minnesota, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Beltrami County
Beltrami County5440.7%3.0 pCi/LThis county
Minnesota, pooled86 counties, pooled22,44934.6%Not pooled−6.1 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−7.3 points
Renville Countyhighest in the state3775.7%6.3 pCi/L+35.0 points
Lake Countylowest in the state783.8%1.3 pCi/L−36.9 points
Clearwater County, MNborders it1154.5%4.7 pCi/L+13.8 points
Pennington County, MNborders it1553.3%4.5 pCi/L+12.6 points
Koochiching County, MNborders it450.0%2.9 pCi/L+9.3 points
Hubbard County, MNborders it6346.0%3.8 pCi/L+5.3 points
Itasca County, MNborders it13726.3%1.9 pCi/L−14.4 points
Cass County, MNborders it10625.5%2.3 pCi/L−15.2 points
Roseau County, MNborders it922.2%1.8 pCi/L−18.5 points
Marshall County, MNborders it119.1%2.2 pCi/L−31.6 points
Where Beltrami County's reported results fell, 2023, beside Minnesota and the United States
ResultBeltrami County testsBeltrami County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L1222.2%36.6%41.4%−14.4 points
2 to 4 pCi/L2037.0%28.9%25.2%+8.1 points
4 pCi/L and above2240.7%34.6%33.4%+6.1 points
Beltrami County ranked among the 62 Minnesota counties with 30 or more tests, by share at or above 4 pCi/L, 2023
CountyRankTestsAt or above 4 pCi/LMedian
Rock County34 of 625942.4%2.0 pCi/L
Wabasha County35 of 6211142.3%3.3 pCi/L
Carlton County36 of 6210541.9%3.1 pCi/L
Swift County37 of 623641.7%3.8 pCi/L
Scott County38 of 6266941.4%3.4 pCi/L
Beltrami County39 of 625440.7%3.0 pCi/L
Rice County40 of 6229740.4%3.2 pCi/L
Pine County41 of 624839.6%2.5 pCi/L
Winona County42 of 6213938.8%3.0 pCi/L
Aitkin County43 of 623138.7%3.1 pCi/L
Morrison County44 of 626235.5%3.0 pCi/L
Beltrami County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
20235440.7%3.0 pCi/L12.0 pCi/L34.6%+10.7 points
20226030.0%2.5 pCi/L8.8 pCi/L31.6%−5.6 points
202110435.6%2.8 pCi/L11.7 pCi/L33.1%+1.8 points
20206533.8%2.9 pCi/L11.2 pCi/L31.8%−1.5 points
20198535.3%3.0 pCi/L14.8 pCi/L36.1%−8.7 points
201810944.0%3.6 pCi/L15.4 pCi/L38.3%−0.6 points
201719544.6%3.5 pCi/L67.1 pCi/L38.2%+9.9 points
201622534.7%2.9 pCi/L16.3 pCi/L37.0%+1.2 points
201523633.5%2.8 pCi/L16.5 pCi/L43.6%+0.2 points
201419833.3%3.0 pCi/L32.0 pCi/L42.9%First on file

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

Beltrami County, State data

Minnesota's own radon test data

Measured

What Minnesota's own agencies publish about radon tests in Beltrami 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 Beltrami 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

39%

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

Median result

3.0 pCi/L

Average result

3.7 pCi/L

Tests behind these figures

146 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.

Beltrami County, Geology

The ground under Beltrami County

Predicted

Most of the ground under Beltrami County is one class on USGS's geologic map: 94.7% of its land is moderate radon potential, with 5.3% high. The map puts 94.7% of Beltrami County in the area it calls Lake Agassiz Plain/Central Lowland-Western Lake Section and 3.0% in Lake Agassiz Plain, with one smaller area beside them. 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 Beltrami 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.Moderate1094.7%
Lake Agassiz PlainSilt and clay deposits of Glacial Lake Agassiz derived from Cretaceous shales containing higher than average amounts of uranium.High153.0%
Central Lowland-Western Lake SectionSandy calcareous till derived from carbonate rocks.High142.1%

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

Beltrami County beside the ground around it

Minnesota as a whole has more high-potential ground than Beltrami County: 61.1% of its land, against 5.3% here. Of the 9 counties that border it, 7 have more high-potential ground, Hubbard County the most at 99.0%.

Share of land by USGS radon potential: Beltrami County, the 9 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Beltrami CountyZone 2None94.7%5.3%
Clearwater CountyZone 2None30.4%69.6%
Koochiching CountyZone 2None99.9%None
Pennington CountyZone 1None70.5%29.5%
Lake of the Woods CountyZone 2None77.8%22.0%
Hubbard CountyZone 1None1.0%99.0%
Itasca CountyZone 2None100%None
Roseau CountyZone 1None75.4%24.5%
Marshall CountyZone 1None32.7%67.3%
Cass CountyZone 2None54.7%45.3%
Minnesota87 counties, pooled by land areaVariesNone38.9%61.1%

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

Local help

Beltrami County, Local resources

Radon testing and mitigation in Beltrami County

Listed radon businesses with an address in Beltrami County:

Listed radon professionals by town: Bemidji

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

Beltrami County, Questions

Questions about radon in Beltrami County

Are radon levels high in Beltrami County?

In 2023, 40.7% of the radon tests reported to CDC for Beltrami County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of 62 Minnesota counties with 30 or more tests for the same period, 38 reported a higher share; pooled, the state comes to 34.6%.

Which counties border Beltrami County?

Beltrami County borders 9 counties: Clearwater County, Koochiching County, Pennington County, Lake of the Woods County, Hubbard County, Itasca County, Roseau County, Marshall County and Cass County.

Products

Beltrami County, Products

Testing a home in Beltrami County

In Beltrami County, 40.7% of 54 tests reported to CDC in 2023 reached 4 pCi/L, against 34.6% pooled across Minnesota. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Beltrami County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Beltrami County homes, compared

Explore

Beltrami County, Bordering counties

Counties bordering Beltrami County

Calculated by Radon411

Beltrami County, Cities and towns

Cities and towns in Beltrami County

The Census Bureau estimates 47,055 residents in Beltrami County for July 1, 2025, 823 more than in 2020 (+1.8%). That works out to 19 people per square mile of land. Its largest town, Bemidji, has 15,770 residents, 33.5% of the total. Together its 8 incorporated places hold 37.1% of those residents; the other 62.9% live outside any of them. Reported testing is thin here: 54 tests over 2023, or 1.1 for every 1,000 residents (2025 estimate), where Minnesota as a whole comes to 3.9.

From Bemidji to Funkley, CDC publishes no figure by town: each reads Beltrami County's.

The cities and towns in Beltrami County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Bemidji15,770+2.4%33.5%
Blackduck815−4.0%1.7%
Wilton267−0.7%0.6%
Kelliher246−3.5%0.5%
Tenstrike179−3.8%0.4%
Turtle River82−3.5%0.2%
Solway72−4.0%0.2%
Funkley12LevelUnder 0.1%

8 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).

Beltrami County, Homes

Homes in Beltrami County

Of Beltrami County's 21,583 homes, 69% are detached houses, against 66% across Minnesota; 13% are in buildings of five or more homes. Much of Beltrami County is recent building: 31% of its homes have gone up since 2000 and the middle year built is 1986, against 1978 for Minnesota. 69% of occupied homes are lived in by their owner (Minnesota: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Beltrami County, Minnesota, 2019 to 2023
HomesBeltrami CountyMinnesota
Housing units21,5832,519,538
Detached houses69%66%
In buildings of 5 or more13%19%
Mobile homes12%3%
Built before 196019%29%
Built since 200031%22%
Middle year built19861978
Owner-occupied69%72%

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