Skip to content
RADON411

Locations and reports

Radon Levels in Le Sueur County, Minnesota

EPA puts Le Sueur County in Zone 1, its highest radon zone, and high results are common there: 62.2% of the 135 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

    62.2%

    27.6 pts above MN

    Le Sueur
    62.2%
    Minnesota
    34.6%

    135 tests, 2023

  • Median result

    5.1pCi/L

    Action level reached

    Le Sueur
    5.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    135

    24th of 62 by tests

    Le Sueur
    135
    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

    10 of 62

    Top quarter

    Le Sueur
    62.2%
    Renville
    75.7%

    By share, of 62 with 30+ tests

Read a result for Le Sueur County

Starts at Le Sueur County's median, 5.1 pCi/L

5.1pCi/L

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

EPA’s reading of 5.1 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Le Sueur County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Le Sueur County, At a glance

Le Sueur County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Le Sueur 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Le Sueur County, 2023

Share of reported tests at or above 4 pCi/L, by year, Le Sueur County
Share of reported tests at or above 4 pCi/L, by year, Le Sueur County
YearShare of reported tests at or above 4 pCi/L
201465.1%
201566.3%
201654.1%
201761.4%
201860.0%
201968.7%
202044.5%
202155.7%
202228.9%
202362.2%

2023: 62.2%. Across these years the share ran from 28.9% to 68.7%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 135 tests reported to CDC for Le Sueur 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

Le Sueur County, Compared

Le Sueur County radon figures, compared

Calculated by Radon411

More than half: 62.2% of the 135 radon tests reported to CDC for Le Sueur County in 2023 read at least 4 pCi/L. That places it 10th of 62 Minnesota counties with 30 or more tests for the same period. That is 27.6 points above the 34.6% pooled from 86 Minnesota counties.

The median result, 5.1 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 22.1 pCi/L. The rest split 18.5% under 2 pCi/L and 19.3% from 2 to 4 (Minnesota: 36.6% and 28.9%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 62.2% share point the same way here.

No bordering county with a figure for the same period reported a higher share; the closest is Waseca County at 60.3%, the lowest Blue Earth County at 32.7%. Statewide for the same period, Renville County reported the highest share (75.7%) and Lake County the lowest (3.8%).

The busiest year on file was 2014, with 235 tests reported; the quietest, 2019, had 83.

Over 10 years of annual figures the share fell 2.9 points, from 65.1% in 2014 to 62.2% in 2023; its peak was 68.7% in 2019. Nationally, every county with a figure for the same period pools to 33.4%; Le Sueur County sits 28.8 points above it.

Share of reported tests at or above 4 pCi/L by year, Le Sueur County against Minnesota2014 to 2023, years with 30 or more tests: Le Sueur County 65.1% to 62.2%, the state's pooled share 34.6% in 2023.
Le Sueur CountyMinnesota, pooled
Share of reported tests at or above 4 pCi/L by year, Le Sueur County against Minnesota: data table
YearTestsLe Sueur County, at or above 4 pCi/LMinnesota, pooled
201423565.1%42.9%
201519666.3%43.6%
201618354.1%37.0%
201715361.4%38.2%
201818060.0%38.3%
20198368.7%36.1%
202015544.5%31.8%
202111555.7%33.1%
202218028.9%31.6%
202313562.2%34.6%
Le Sueur County against Minnesota, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Le Sueur County
Le Sueur County13562.2%5.1 pCi/LThis county
Minnesota, pooled86 counties, pooled22,44934.6%Not pooled−27.6 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−28.8 points
Renville Countyhighest in the state3775.7%6.3 pCi/L+13.5 points
Lake Countylowest in the state783.8%1.3 pCi/L−58.4 points
Waseca County, MNborders it6360.3%5.0 pCi/L−1.9 points
Sibley County, MNborders it5560.0%5.0 pCi/L−2.2 points
Nicollet County, MNborders it12945.7%3.7 pCi/L−16.5 points
Scott County, MNborders it66941.4%3.4 pCi/L−20.8 points
Rice County, MNborders it29740.4%3.2 pCi/L−21.8 points
Blue Earth County, MNborders it39232.7%2.2 pCi/L−29.5 points
Where Le Sueur County's reported results fell, 2023, beside Minnesota and the United States
ResultLe Sueur County testsLe Sueur County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L2518.5%36.6%41.4%−18.1 points
2 to 4 pCi/L2619.3%28.9%25.2%−9.6 points
4 pCi/L and above8462.2%34.6%33.4%+27.6 points
Le Sueur 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
Kandiyohi County5 of 6210665.1%5.3 pCi/L
Clay County6 of 6210065.0%5.5 pCi/L
Lyon County6 of 628065.0%6.1 pCi/L
Brown County8 of 6211563.5%5.4 pCi/L
Dodge County9 of 6215563.2%4.7 pCi/L
Le Sueur County10 of 6213562.2%5.1 pCi/L
Otter Tail County11 of 6217161.4%4.8 pCi/L
Waseca County12 of 626360.3%5.0 pCi/L
Polk County13 of 629060.0%4.7 pCi/L
Sibley County13 of 625560.0%5.0 pCi/L
Nobles County15 of 624158.5%4.7 pCi/L
Le Sueur County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
202313562.2%5.1 pCi/L22.1 pCi/L34.6%+33.3 points
202218028.9%1.9 pCi/L42.0 pCi/L31.6%−26.8 points
202111555.7%4.6 pCi/L48.7 pCi/L33.1%+11.2 points
202015544.5%3.5 pCi/L44.0 pCi/L31.8%−24.2 points
20198368.7%5.4 pCi/L33.7 pCi/L36.1%+8.7 points
201818060.0%4.5 pCi/L41.1 pCi/L38.3%−1.4 points
201715361.4%5.1 pCi/L141.7 pCi/L38.2%+7.3 points
201618354.1%4.2 pCi/L28.0 pCi/L37.0%−12.2 points
201519666.3%5.9 pCi/L43.8 pCi/L43.6%+1.2 points
201423565.1%5.5 pCi/L38.2 pCi/L42.9%First on file

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

Le Sueur County, State data

Minnesota's own radon test data

Measured

What Minnesota's own agencies publish about radon tests in Le Sueur 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 Le Sueur 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

58.2%

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

Median result

4.5 pCi/L

Average result

6.0 pCi/L

Tests behind these figures

123 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.

Le Sueur County, Geology

The ground under Le Sueur County

Predicted

USGS's geologic map puts all of Le Sueur County's mapped land in one class: high radon potential. All of it lies in the area the map calls Central Lowland-Till Prairie, to which USGS gives a radon index of 14, in the high band (12 to 17).

USGS's geologic areas under Le Sueur County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Central Lowland-Till PrairieSilty and clayey till derived from shale and sandstone.High14100%

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

Le Sueur County beside the ground around it

Le Sueur County has more high-potential ground than Minnesota as a whole: 100% of its land against 61.1%. Of the 6 counties that border it, none has as large a share of high-potential ground; Blue Earth County comes nearest at 100%.

Share of land by USGS radon potential: Le Sueur County, the 6 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Le Sueur CountyZone 1NoneNone100%
Scott CountyZone 1NoneNone100%
Rice CountyZone 1NoneNone100%
Nicollet CountyZone 1NoneNone100%
Waseca CountyZone 1NoneNone100%
Sibley CountyZone 1NoneNone100%
Blue Earth CountyZone 1NoneNone100%
Minnesota87 counties, pooled by land areaVariesNone38.9%61.1%

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

Local help

Le Sueur County, Local resources

Radon testing and mitigation in Le Sueur County

Listed radon businesses with an address in Le Sueur County:

Listed radon professionals by town: Mankato, Waterville, Cleveland

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

Le Sueur County, Questions

Questions about radon in Le Sueur County

Are radon levels high in Le Sueur County?

In 2023, 62.2% of the radon tests reported to CDC for Le Sueur County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.1 pCi/L. Of 62 Minnesota counties with 30 or more tests for the same period, 9 reported a higher share; pooled, the state comes to 34.6%.

Which counties border Le Sueur County?

Le Sueur County borders 6 counties: Scott County, Rice County, Nicollet County, Waseca County, Sibley County and Blue Earth County.

Products

Le Sueur County, Products

Testing a home in Le Sueur County

In Le Sueur County, 62.2% of 135 tests reported to CDC in 2023 reached 4 pCi/L, against 34.6% pooled across Minnesota. In Zone 1 the year-round level in Le Sueur 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

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

Explore

Le Sueur County, Bordering counties

Counties bordering Le Sueur County

Calculated by Radon411

Le Sueur County, Cities and towns

Cities and towns in Le Sueur County

The Census Bureau estimates 29,453 residents in Le Sueur County for July 1, 2025, 820 more than in 2020 (+2.9%). That works out to 66 people per square mile of land. Mankato, the largest place on its list (46,529 residents in all), extends beyond Le Sueur County, so no share of the total is worked out for it. CDC's 135 reported tests for 2023 work out to 4.6 per 1,000 residents (2025 estimate), close to Minnesota's 3.9.

From Mankato to Heidelberg, CDC publishes no figure by town: each reads Le Sueur County's.

The cities and towns in Le Sueur County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Mankatoextends beyond Le Sueur County46,529+4.2%Counted whole
New Pragueextends beyond Le Sueur County8,238+1.1%Counted whole
Le Sueurextends beyond Le Sueur County4,210+0.3%Counted whole
Montgomery3,539+8.5%12.0%
Le Center2,524+0.7%8.6%
Waterville1,757+0.7%6.0%
Cleveland772+3.3%2.6%
Elysianextends beyond Le Sueur County765+8.2%Counted whole
Kasota728+2.2%2.5%
Kilkenny153+6.3%0.5%
Heidelberg134−0.7%0.5%

11 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 Le Sueur County is counted whole, so it has no share.

Le Sueur County, Homes

Homes in Le Sueur County

Le Sueur County is a place of houses on their own lots: 82% of its 12,978 homes are detached single-family houses, against 66% across Minnesota. Half of its homes were built before 1973, close to Minnesota's 1978: 37% date from before 1960 and 22% 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 Le Sueur County, Minnesota, 2019 to 2023
HomesLe Sueur CountyMinnesota
Housing units12,9782,519,538
Detached houses82%66%
In buildings of 5 or more8%19%
Mobile homes2%3%
Built before 196037%29%
Built since 200022%22%
Middle year built19731978
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.