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Radon Levels in Todd County, Minnesota

EPA puts Todd County in Zone 1, its highest radon zone, and 23.8% of its 63 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

    23.8%

    10.8 pts below MN

    Todd
    23.8%
    Minnesota
    34.6%

    63 tests, 2023

  • Median result

    2.0pCi/L

    Below action level

    Todd
    2.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    63

    44th of 62 by tests

    Todd
    63
    Hennepin
    6,545

    Reported to CDC before any fix, 2023

  • 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

    53 of 62

    Lowest quarter

    Todd
    23.8%
    Renville
    75.7%

    By share, of 62 with 30+ tests

Read a result for Todd County

Starts at Todd County's median, 2.0 pCi/L

2.0pCi/L

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

EPA’s reading of 2.0 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. Todd County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Todd County, At a glance

Todd County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Todd 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: High across 77% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Todd County, 2023

Share of reported tests at or above 4 pCi/L, by year, Todd County
Share of reported tests at or above 4 pCi/L, by year, Todd County
YearShare of reported tests at or above 4 pCi/L
201447.6%
201544.0%
201647.5%
201738.9%
201841.3%
201939.3%
202016.7%
202133.3%
202222.6%
202323.8%

2023: 23.8%. Across these years the share ran from 16.7% to 47.6%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 63 tests reported to CDC for Todd 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

Todd County, Compared

Todd County radon figures, compared

Calculated by Radon411

Todd County's 63 reported tests in 2023 had a middle value of 2.0 pCi/L and a maximum of 20.5 pCi/L, and 23.8% reached 4 pCi/L. Minnesota as a whole (86 Minnesota counties, pooled) comes to 34.6%: 10.8 points higher than here.

Among its state's counties it ranks 53rd of 62 Minnesota counties with 30 or more tests for the same period. Statewide for the same period, Renville County reported the highest share (75.7%) and Lake County the lowest (3.8%).

Below the action level, 30 tests (47.6%) came in under 2 pCi/L, against 36.6% statewide, and 18 tests (28.6%) fell between 2 and 4, against 28.9% statewide. The busiest year on file was 2015, with 100 tests reported; the quietest, 2017, had 18.

EPA's 1993 zone map puts Todd County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 77% of the county's land high radon potential.

Next door, the shares run from 25.5% in Cass County to 61.4% in Otter Tail County. Over 8 years of annual figures the share fell 23.8 points, from 47.6% in 2014 to 23.8% in 2023; its peak was 47.6% in 2014.

Share of reported tests at or above 4 pCi/L by year, Todd County against Minnesota2014 to 2023, years with 30 or more tests: Todd County 47.6% to 23.8%, the state's pooled share 34.6% in 2023.
Todd CountyMinnesota, pooled
Share of reported tests at or above 4 pCi/L by year, Todd County against Minnesota: data table
YearTestsTodd County, at or above 4 pCi/LMinnesota, pooled
20146347.6%42.9%
201510044.0%43.6%
20169947.5%37.0%
20184641.3%38.3%
20195639.3%36.1%
20214533.3%33.1%
20228422.6%31.6%
20236323.8%34.6%
Todd County against Minnesota, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Todd County
Todd County6323.8%2.0 pCi/LThis county
Minnesota, pooled86 counties, pooled22,44934.6%Not pooled+10.8 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+9.6 points
Renville Countyhighest in the state3775.7%6.3 pCi/L+51.9 points
Lake Countylowest in the state783.8%1.3 pCi/L−20.0 points
Otter Tail County, MNborders it17161.4%4.8 pCi/L+37.6 points
Douglas County, MNborders it14548.3%3.7 pCi/L+24.5 points
Stearns County, MNborders it36646.7%3.7 pCi/L+22.9 points
Wadena County, MNborders it1540.0%2.8 pCi/L+16.2 points
Morrison County, MNborders it6235.5%3.0 pCi/L+11.7 points
Cass County, MNborders it10625.5%2.3 pCi/L+1.7 points
Where Todd County's reported results fell, 2023, beside Minnesota and the United States
ResultTodd County testsTodd County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L3047.6%36.6%41.4%+11.0 points
2 to 4 pCi/L1828.6%28.9%25.2%−0.3 points
4 pCi/L and above1523.8%34.6%33.4%−10.8 points
Todd 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
Blue Earth County48 of 6239232.7%2.2 pCi/L
Hennepin County49 of 626,54532.0%2.7 pCi/L
Crow Wing County50 of 6217730.5%2.7 pCi/L
Itasca County51 of 6213726.3%1.9 pCi/L
Cass County52 of 6210625.5%2.3 pCi/L
Todd County53 of 626323.8%2.0 pCi/L
Ramsey County54 of 622,21323.5%2.2 pCi/L
Benton County55 of 624323.3%2.2 pCi/L
Isanti County56 of 626622.7%2.0 pCi/L
Sherburne County57 of 6235121.7%1.8 pCi/L
Washington County58 of 621,51821.3%1.9 pCi/L
Todd County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
20236323.8%2.0 pCi/L20.5 pCi/L34.6%+1.2 points
20228422.6%1.7 pCi/L13.9 pCi/L31.6%−10.7 points
20214533.3%3.4 pCi/L12.2 pCi/L33.1%+16.6 points
20202416.7%2.3 pCi/L10.5 pCi/L31.8%−22.6 points
20195639.3%3.2 pCi/L43.5 pCi/L36.1%−2.0 points
20184641.3%2.9 pCi/L14.6 pCi/L38.3%+2.4 points
20171838.9%3.5 pCi/L19.9 pCi/L38.2%−8.6 points
20169947.5%3.9 pCi/L1018.6 pCi/L37.0%+3.5 points
201510044.0%3.5 pCi/L11.9 pCi/L43.6%−3.6 points
20146347.6%3.7 pCi/L17.1 pCi/L42.9%First on file

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

Todd County, State data

Minnesota's own radon test data

Measured

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

43.3%

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

Median result

3.4 pCi/L

Average result

7.3 pCi/L

Tests behind these figures

34 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.

Todd County, Geology

The ground under Todd County

Predicted

Most of the ground under Todd County is one class on USGS's geologic map: 77.3% of its land is high radon potential, with 22.7% moderate. The map puts 62.9% of Todd County in the area it calls Central Lowland-Western Lake Section and 22.7% in Superior Upland/Central Lowland-Western Lake Section, with one smaller area beside them. USGS gives the first a radon index of 14, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Todd County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Central Lowland-Western Lake SectionSandy calcareous till derived from carbonate rocks.High1462.9%
Superior Upland/Central Lowland-Western Lake SectionGlacial deposits derived primarily from volcanic rock.Moderate1022.7%
Central Lowland-Till PrairieSilty and clayey till derived from shale and sandstone.High1414.3%

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

Todd County beside the ground around it

Todd County has more high-potential ground than Minnesota as a whole: 77.3% of its land against 61.1%. Of the 6 counties that border it, 4 have more high-potential ground, Douglas County the most at 100%.

Share of land by USGS radon potential: Todd County, the 6 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Todd CountyZone 1None22.7%77.3%
Douglas CountyZone 1NoneNone100%
Morrison CountyZone 2None97.7%2.3%
Wadena CountyZone 1None0.9%99.1%
Stearns CountyZone 1None21.5%78.5%
Otter Tail CountyZone 1NoneNone100%
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

Todd County, Local resources

Radon testing and mitigation in Todd 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

Todd County, Questions

Questions about radon in Todd County

Are radon levels high in Todd County?

In 2023, 23.8% of the radon tests reported to CDC for Todd County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 62 Minnesota counties with 30 or more tests for the same period, 52 reported a higher share; pooled, the state comes to 34.6%.

Which counties border Todd County?

Todd County borders 6 counties: Douglas County, Morrison County, Wadena County, Stearns County, Otter Tail County and Cass County.

Products

Todd County, Products

Testing a home in Todd County

In Todd County, 23.8% of 63 tests reported to CDC in 2023 reached 4 pCi/L, against 34.6% pooled across Minnesota. In Zone 1 the year-round level in Todd 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

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

Explore

Todd County, Bordering counties

Counties bordering Todd County

Calculated by Radon411

Todd County, Cities and towns

Cities and towns in Todd County

The Census Bureau estimates 26,060 residents in Todd County for July 1, 2025, 769 more than in 2020 (+3.0%). That works out to 28 people per square mile of land. No town dominates: Long Prairie, the largest, has 3,830 residents, 14.7% of the total. Reported testing is thin here: 63 tests over 2023, or 2.4 for every 1,000 residents (2025 estimate), where Minnesota as a whole comes to 3.9.

From Long Prairie to West Union, CDC publishes no figure by town: each reads Todd County's.

The cities and towns in Todd County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Long Prairie3,830+4.9%14.7%
Staplesextends beyond Todd County3,074+1.8%Counted whole
Osakisextends beyond Todd County1,739−1.7%Counted whole
Browerville821−1.8%3.2%
Clarissa655−1.2%2.5%
Bertha543−2.3%2.1%
Eagle Bend542−2.5%2.1%
Swanvilleextends beyond Todd County334+1.5%Counted whole
Grey Eagle322−2.4%1.2%
Hewitt245−2.0%0.9%
Burtrum123−1.6%0.5%
West Union90+2.3%0.3%

12 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 Todd County is counted whole, so it has no share.

Todd County, Homes

Homes in Todd County

Todd County is a place of houses on their own lots: 83% of its 12,929 homes are detached single-family houses, against 66% across Minnesota. Half of its homes were built before 1974, close to Minnesota's 1978: 36% date from before 1960 and 20% from 2000 or later. Owners live in 83% of the occupied homes (Minnesota: 72%), so for most households a test and a fix are their own to order.

Homes in Todd County, Minnesota, 2019 to 2023
HomesTodd CountyMinnesota
Housing units12,9292,519,538
Detached houses83%66%
In buildings of 5 or more6%19%
Mobile homes9%3%
Built before 196036%29%
Built since 200020%22%
Middle year built19741978
Owner-occupied83%72%

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