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Radon Levels in Lac qui Parle County, Minnesota

EPA puts Lac qui Parle County in Zone 1, its highest radon zone, and only 23 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

    67.2%

    23.0 pts above MN

    Lac qui Parle
    67.2%
    Minnesota
    44.2%

    357 tests, 2005 to 2014

  • Median result

    5.6pCi/L

    Action level reached

    Lac qui Parle
    5.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2005 to 2014

  • Tests reported

    357

    50th of 87 by tests

    Lac qui Parle
    357
    Hennepin
    32,450

    Reported to CDC before any fix, 2005 to 2014

  • 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

    20 of 87

    Top quarter

    Lac qui Parle
    67.2%
    Rock
    85.0%

    By share, of 87 with 30+ tests

Read a result for Lac qui Parle County

Starts at Lac qui Parle County's median, 5.6 pCi/L

5.6pCi/L

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

EPA’s reading of 5.6 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. Lac qui Parle County's median reported result, 2005 to 2014.

Interpret this readingWhat a fix costs

The data

Lac qui Parle County, At a glance

Lac qui Parle County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Lac qui Parle 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 Lac qui Parle County, 2023

Share of reported tests at or above 4 pCi/L, by year, Lac qui Parle County
Share of reported tests at or above 4 pCi/L, by year, Lac qui Parle County
YearShare of reported tests at or above 4 pCi/L
201460.9%
201575.0%
201653.8%
201755.0%
201862.5%
201972.0%
202066.7%
202159.1%
202250.0%
202373.9%

2023: 73.9%. Across these years the share ran from 50.0% to 75.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 23 tests were reported to CDC for Lac qui Parle 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

Lac qui Parle County, Compared

Lac qui Parle County radon figures, compared

Calculated by Radon411

More than half: 67.2% of the 357 radon tests reported to CDC for Lac qui Parle County over the 2005 to 2014 laboratory totals read at least 4 pCi/L. That places it 20th of 87 Minnesota counties with 30 or more tests for the same period. That is 23.0 points above the 44.2% pooled from 87 Minnesota counties.

The newest figure, in 2023, counts only 23 tests (73.9% at or above 4 pCi/L), too few to compare, so this reading uses the 357-test figure.

The median result, 5.6 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 67.4 pCi/L. The rest split 10.4% under 2 pCi/L and 22.4% from 2 to 4 (Minnesota: 26.4% and 29.3%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 67.2% share point the same way here.

No bordering county with a figure for the same period reported a higher share; the closest is Yellow Medicine County at 66.3%, the lowest Swift County at 50.0%. Statewide for the same period, Rock County reported the highest share (85.0%) and Anoka County the lowest (16.4%).

The busiest year on file was 2018, with 48 tests reported; the quietest, 2020, had 15.

Nationally, every county with a figure for the same period pools to 36.0%; Lac qui Parle County sits 31.2 points above it. CDC also counts 31 tests taken after mitigation in Lac qui Parle County for the same period: tests in homes where a fix was already in.

Lac qui Parle County against Minnesota, the United States and nearby counties, 2005 to 2014, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Lac qui Parle County
Lac qui Parle County35767.2%5.6 pCi/LThis county
Minnesota, pooled87 counties, pooled116,16644.2%Not pooled−23.0 points
United States, pooled2,655 counties, pooled1,669,35336.0%Not pooled−31.2 points
Rock Countyhighest in the state20685.0%7.8 pCi/L+17.8 points
Anoka Countylowest in the state4,83216.4%1.8 pCi/L−50.8 points
Deuel County, SDborders it2669.2%5.5 pCi/L+2.0 points
Yellow Medicine County, MNborders it30066.3%5.9 pCi/L−0.9 points
Chippewa County, MNborders it33364.9%5.5 pCi/L−2.3 points
Big Stone County, MNborders it21961.6%4.9 pCi/L−5.6 points
Grant County, SDborders it8361.4%5.8 pCi/L−5.8 points
Swift County, MNborders it41450.0%4.0 pCi/L−17.2 points
Where Lac qui Parle County's reported results fell, 2005 to 2014, laboratory, beside Minnesota and the United States
ResultLac qui Parle County testsLac qui Parle County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L3710.4%26.4%39.8%−16.0 points
2 to 4 pCi/L8022.4%29.3%24.2%−6.9 points
4 pCi/L and above24067.2%44.2%36.0%+23.0 points
Lac qui Parle County ranked among the 87 Minnesota counties with 30 or more tests, by share at or above 4 pCi/L, 2005 to 2014, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Lyon County15 of 8790568.5%5.8 pCi/L
Martin County16 of 8741268.4%6.0 pCi/L
Wabasha County17 of 8743567.8%5.6 pCi/L
Steele County18 of 871,06467.6%5.7 pCi/L
Sibley County19 of 8747367.2%5.7 pCi/L
Lac qui Parle County20 of 8735767.2%5.6 pCi/L
Lincoln County21 of 8712966.7%6.6 pCi/L
Blue Earth County22 of 871,87766.4%5.7 pCi/L
Yellow Medicine County23 of 8730066.3%5.9 pCi/L
Waseca County24 of 8746066.1%6.1 pCi/L
Nicollet County25 of 871,26666.0%5.5 pCi/L
Lac qui Parle County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
20232373.9%6.2 pCi/L24.8 pCi/L34.6%+23.9 points
20222650.0%4.0 pCi/L9.9 pCi/L31.6%−9.1 points
20212259.1%5.8 pCi/L12.7 pCi/L33.1%−7.6 points
20201566.7%9.4 pCi/L32.2 pCi/L31.8%−5.3 points
20192572.0%6.4 pCi/L18.7 pCi/L36.1%+9.5 points
20184862.5%6.0 pCi/L33.8 pCi/L38.3%+7.5 points
20172055.0%5.0 pCi/L29.9 pCi/L38.2%+1.2 points
20162653.8%4.1 pCi/L26.7 pCi/L37.0%−21.2 points
20153675.0%5.6 pCi/L15.4 pCi/L43.6%+14.1 points
20142360.9%5.9 pCi/L19.2 pCi/L42.9%First on file

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

Lac qui Parle County, State data

Minnesota's own radon test data

Measured

What Minnesota's own agencies publish about radon tests in Lac qui Parle 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 Lac qui Parle 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

67.9%

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

Median result

5.3 pCi/L

Average result

6.5 pCi/L

Tests behind these figures

22 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.

Lac qui Parle County, Geology

The ground under Lac qui Parle County

Predicted

USGS's geologic map puts all of Lac qui Parle County's mapped land in one class: high radon potential. The map puts 77.3% of Lac qui Parle County in the area it calls Central Lowland-Till Prairie and 22.7% in Glacial Lake Deposits. USGS gives both a radon index of 14, in the high band (12 to 17).

USGS's geologic areas under Lac qui Parle County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Central Lowland-Till PrairieSilty and clayey till derived from shale and sandstone.High1477.3%
Glacial Lake DepositsSilt and clay glacial lake deposits.High1422.7%

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

Lac qui Parle County beside the ground around it

Lac qui Parle 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; Big Stone County comes nearest at 100%.

Share of land by USGS radon potential: Lac qui Parle County, the 6 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Lac qui Parle CountyZone 1NoneNone100%
Yellow Medicine CountyZone 1NoneNone100%
Big Stone CountyZone 1NoneNone100%
Grant County, SDZone 1NoneNone100%
Swift CountyZone 1NoneNone100%
Chippewa CountyZone 1NoneNone100%
Deuel County, SDZone 1NoneNone100%
Minnesota87 counties, pooled by land areaVariesNone38.9%61.1%

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

Local help

Lac qui Parle County, Local resources

Radon testing and mitigation in Lac qui Parle 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

Lac qui Parle County, Questions

Questions about radon in Lac qui Parle County

Are radon levels high in Lac qui Parle County?

In 2023, 73.9% of the radon tests reported to CDC for Lac qui Parle County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.2 pCi/L. Of 87 Minnesota counties with 30 or more tests for the same period, 19 reported a higher share; pooled, the state comes to 44.2%.

Which counties border Lac qui Parle County?

Lac qui Parle County borders 6 counties: Yellow Medicine County, MN, Big Stone County, MN, Grant County, SD, Swift County, MN, Chippewa County, MN and Deuel County, SD.

Products

Lac qui Parle County, Products

Testing a home in Lac qui Parle County

In Lac qui Parle County, 67.2% of 357 tests reported to CDC over the 2005 to 2014 laboratory totals reached 4 pCi/L, against 44.2% pooled across Minnesota. In Zone 1 the year-round level in Lac qui Parle 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

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

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Lac qui Parle County, Bordering counties

Counties bordering Lac qui Parle County

Calculated by Radon411

Lac qui Parle County, Cities and towns

Cities and towns in Lac qui Parle County

Lac qui Parle County's population has barely moved since 2020: 6,704 residents on July 1, 2025 against 6,692 then, by the Census Bureau's estimates. Spread over its land, that is 8.8 people to the square mile. Its largest town, Madison, has 1,504 residents, 22.4% of the total. Together its 7 incorporated places hold 51.4% of those residents; the other 48.6% live outside any of them. Testing is reported here more often than across the state: CDC's 357 reported tests for 2005 to 2014 come to 53.3 for every 1,000 residents (2025 estimate), against 19.9 for Minnesota.

From Madison to Louisburg, CDC publishes no figure by town: each reads Lac qui Parle County's.

The cities and towns in Lac qui Parle County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Madison1,504−0.5%22.4%
Dawson1,444−0.6%21.5%
Bellingham144−0.7%2.1%
Boyd143−1.4%2.1%
Marietta117−1.7%1.7%
Nassau66Level1.0%
Louisburg29Level0.4%

7 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).

Lac qui Parle County, Homes

Homes in Lac qui Parle County

Lac qui Parle County is a place of houses on their own lots: 87% of its 3,474 homes are detached single-family houses, against 66% across Minnesota. The homes are older than Minnesota's as a whole: half were built before 1950 (1978 for Minnesota), and 60% date from before 1960. 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 Lac qui Parle County, Minnesota, 2019 to 2023
HomesLac qui Parle CountyMinnesota
Housing units3,4742,519,538
Detached houses87%66%
In buildings of 5 or more8%19%
Mobile homes1%3%
Built before 196060%29%
Built since 20008%22%
Middle year built19501978
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.