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Radon Levels in Morrison County, Minnesota

EPA puts Morrison County in Zone 2, its middle radon zone, and 35.5% of its 62 reported radon tests (2023) were 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

    35.5%

    0.9 pts above MN

    Morrison
    35.5%
    Minnesota
    34.6%

    62 tests, 2023

  • Median result

    3.0pCi/L

    Below action level

    Morrison
    3.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    62

    45th of 62 by tests

    Morrison
    62
    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

    44 of 62

    Middle half

    Morrison
    35.5%
    Renville
    75.7%

    By share, of 62 with 30+ tests

Read a result for Morrison County

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

Interpret this readingWhat a fix costs

The data

Morrison County, At a glance

Morrison County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Morrison 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 98% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Morrison County, 2023

Share of reported tests at or above 4 pCi/L, by year, Morrison County
Share of reported tests at or above 4 pCi/L, by year, Morrison County
YearShare of reported tests at or above 4 pCi/L
201442.2%
201547.1%
201631.6%
201743.0%
201834.4%
201930.6%
202026.7%
202140.0%
202231.4%
202335.5%

2023: 35.5%. Across these years the share ran from 26.7% to 47.1%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 62 tests reported to CDC for Morrison 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

Morrison County, Compared

Morrison County radon figures, compared

Calculated by Radon411

In Morrison County, about 4 in 10 reported tests in 2023 (22 of 62) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 2.1 points higher. Across 86 Minnesota counties pooled together, 34.6% of tests reached that level, so Morrison County runs 0.9 points above its state.

Of 5 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 23.3% (Benton County) to 46.7% (Stearns County). By share, Morrison County is 44th of 62 Minnesota counties with 30 or more tests for the same period.

Year by year, 2014 opened at 42.2% and 2023 closed at 35.5% (down 6.7 points), with 2015 the high at 47.1%. Half the tests came in under 3.0 pCi/L and half over it; the single highest reached 140.6 pCi/L. Below the action level, 21 tests (33.9%) came in under 2 pCi/L, against 36.6% statewide, and 19 tests (30.6%) 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 35.5% share point the same way here. USGS geology rates 98% of the county's land moderate radon potential.

The busiest year on file was 2014, with 306 tests reported; the quietest, 2019, had 49.

Share of reported tests at or above 4 pCi/L by year, Morrison County against Minnesota2014 to 2023, years with 30 or more tests: Morrison County 42.2% to 35.5%, the state's pooled share 34.6% in 2023.
Morrison CountyMinnesota, pooled
Share of reported tests at or above 4 pCi/L by year, Morrison County against Minnesota: data table
YearTestsMorrison County, at or above 4 pCi/LMinnesota, pooled
201430642.2%42.9%
201511947.1%43.6%
20169531.6%37.0%
20179343.0%38.2%
201815134.4%38.3%
20194930.6%36.1%
20206026.7%31.8%
20218040.0%33.1%
202210231.4%31.6%
20236235.5%34.6%
Morrison County against Minnesota, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Morrison County
Morrison County6235.5%3.0 pCi/LThis county
Minnesota, pooled86 counties, pooled22,44934.6%Not pooled−0.9 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−2.1 points
Renville Countyhighest in the state3775.7%6.3 pCi/L+40.2 points
Lake Countylowest in the state783.8%1.3 pCi/L−31.7 points
Stearns County, MNborders it36646.7%3.7 pCi/L+11.2 points
Mille Lacs County, MNborders it2133.3%2.6 pCi/L−2.2 points
Crow Wing County, MNborders it17730.5%2.7 pCi/L−5.0 points
Cass County, MNborders it10625.5%2.3 pCi/L−10.0 points
Todd County, MNborders it6323.8%2.0 pCi/L−11.7 points
Benton County, MNborders it4323.3%2.2 pCi/L−12.2 points
Where Morrison County's reported results fell, 2023, beside Minnesota and the United States
ResultMorrison County testsMorrison County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L2133.9%36.6%41.4%−2.7 points
2 to 4 pCi/L1930.6%28.9%25.2%+1.7 points
4 pCi/L and above2235.5%34.6%33.4%+0.9 points
Morrison 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
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
Chisago County45 of 6216634.9%2.9 pCi/L
Dakota County46 of 622,18334.6%2.9 pCi/L
Carver County47 of 6248934.6%2.8 pCi/L
Blue Earth County48 of 6239232.7%2.2 pCi/L
Hennepin County49 of 626,54532.0%2.7 pCi/L
Morrison County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
20236235.5%3.0 pCi/L140.6 pCi/L34.6%+4.1 points
202210231.4%3.0 pCi/L26.4 pCi/L31.6%−8.6 points
20218040.0%3.3 pCi/L14.1 pCi/L33.1%+13.3 points
20206026.7%2.0 pCi/L15.2 pCi/L31.8%−3.9 points
20194930.6%3.3 pCi/L26.9 pCi/L36.1%−3.8 points
201815134.4%2.4 pCi/L18.0 pCi/L38.3%−8.6 points
20179343.0%3.7 pCi/L37.3 pCi/L38.2%+11.4 points
20169531.6%2.8 pCi/L9.3 pCi/L37.0%−15.5 points
201511947.1%3.7 pCi/L32.4 pCi/L43.6%+4.9 points
201430642.2%3.5 pCi/L43.1 pCi/L42.9%First on file

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

Morrison County, State data

Minnesota's own radon test data

Measured

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

36.7%

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

Median result

3.0 pCi/L

Average result

4.8 pCi/L

Tests behind these figures

64 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.

Morrison County, Geology

The ground under Morrison County

Predicted

Most of the ground under Morrison County is one class on USGS's geologic map: 97.7% of its land is moderate radon potential, with 2.3% high. 97.7% of it lies in the area the map calls Superior Upland/Central Lowland-Western Lake Section, to which USGS gives a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Morrison County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Superior Upland/Central Lowland-Western Lake SectionGlacial deposits derived primarily from volcanic rock.Moderate1097.7%
Central Lowland-Western Lake SectionSandy calcareous till derived from carbonate rocks.High142.3%

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

Morrison County beside the ground around it

Minnesota as a whole has more high-potential ground than Morrison County: 61.1% of its land, against 2.3% here. Of the 6 counties that border it, 5 have more high-potential ground, Stearns County the most at 78.5%.

Share of land by USGS radon potential: Morrison County, the 6 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Morrison CountyZone 2None97.7%2.3%
Crow Wing CountyZone 2None99.0%1.0%
Benton CountyZone 2None91.6%8.4%
Mille Lacs CountyZone 2None95.2%4.8%
Todd CountyZone 1None22.7%77.3%
Stearns CountyZone 1None21.5%78.5%
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

Morrison County, Local resources

Radon testing and mitigation in Morrison 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

Morrison County, Questions

Questions about radon in Morrison County

Are radon levels high in Morrison County?

In 2023, 35.5% of the radon tests reported to CDC for Morrison 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, 43 reported a higher share; pooled, the state comes to 34.6%.

Which counties border Morrison County?

Morrison County borders 6 counties: Crow Wing County, Benton County, Mille Lacs County, Todd County, Stearns County and Cass County.

Products

Morrison County, Products

Testing a home in Morrison County

In Morrison County, 35.5% of 62 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 Morrison County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Morrison County homes, compared

Explore

Morrison County, Bordering counties

Counties bordering Morrison County

Calculated by Radon411

Morrison County, Cities and towns

Cities and towns in Morrison County

The Census Bureau estimates 34,620 residents in Morrison County for July 1, 2025, 629 more than in 2020 (+1.9%). That works out to 31 people per square mile of land. Its largest town, Little Falls, has 9,277 residents, 26.8% of the total. Reported testing is thin here: 62 tests over 2023, or 1.8 for every 1,000 residents (2025 estimate), where Minnesota as a whole comes to 3.9.

From Little Falls to Hillman, CDC publishes no figure by town: each reads Morrison County's.

The 12 largest cities and towns in Morrison County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Little Falls9,277+1.8%26.8%
Pierz1,450+2.0%4.2%
Royaltonextends beyond Morrison County1,274−0.5%Counted whole
Motleyextends beyond Morrison County688+1.6%Counted whole
Randall625+2.5%1.8%
Upsala478−1.4%1.4%
Swanvilleextends beyond Morrison County334+1.5%Counted whole
Buckman306−0.6%0.9%
Bowlus269−2.5%0.8%
Sobieski217+1.4%0.6%
Flensburg211−2.8%0.6%
Harding124−0.8%0.4%
  • Lastrup
  • Elmdale
  • Genola
  • Hillman

16 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Morrison County is counted whole, so it has no share.

Morrison County, Homes

Homes in Morrison County

Morrison County is a place of houses on their own lots: 83% of its 16,204 homes are detached single-family houses, against 66% across Minnesota. Half of its homes were built before 1978, close to Minnesota's 1978: 33% date from before 1960 and 23% 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 Morrison County, Minnesota, 2019 to 2023
HomesMorrison CountyMinnesota
Housing units16,2042,519,538
Detached houses83%66%
In buildings of 5 or more5%19%
Mobile homes6%3%
Built before 196033%29%
Built since 200023%22%
Middle year built19781978
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.