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Radon Levels in Jackson County, Wisconsin

EPA puts Jackson County in Zone 2, its middle radon zone, and 38.7% of its 93 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

    38.7%

    3.0 pts above WI

    Jackson
    38.7%
    Wisconsin
    35.7%

    93 tests, 2023

  • Median result

    3.2pCi/L

    Below action level

    Jackson
    3.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    93

    46th of 69 by tests

    Jackson
    93
    Dane
    2,887

    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 Wisconsin

    33 of 69

    Middle half

    Jackson
    38.7%
    Langlade
    65.8%

    By share, of 69 with 30+ tests

Read a result for Jackson County

Starts at Jackson County's median, 3.2 pCi/L

3.2pCi/L

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

EPA’s reading of 3.2 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. Jackson County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Jackson County, At a glance

Jackson County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Jackson 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Jackson County, 2023

Share of reported tests at or above 4 pCi/L, by year, Jackson County
Share of reported tests at or above 4 pCi/L, by year, Jackson County
YearShare of reported tests at or above 4 pCi/L
201435.7%
201554.5%
201638.2%
201740.4%
201942.6%
202053.6%
202158.1%
202241.2%
202338.7%

2023: 38.7%. Across these years the share ran from 35.7% to 58.1%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 93 tests reported to CDC for Jackson 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

Jackson County, Compared

Jackson County radon figures, compared

Calculated by Radon411

In Jackson County, about 4 in 10 reported tests in 2023 (36 of 93) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 5.3 points higher. Across 72 Wisconsin counties pooled together, 35.7% of tests reached that level, so Jackson County runs 3.0 points above its state.

Of 7 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 6 a smaller one; the spread is 10.0% (Juneau County) to 42.0% (Trempealeau County). By share, Jackson County is 33rd of 69 Wisconsin counties with 30 or more tests for the same period.

Year by year, 2016 opened at 38.2% and 2023 closed at 38.7% (about level), with 2021 the high at 58.1%. Half the tests came in under 3.2 pCi/L and half over it; the single highest reached 16.8 pCi/L. Below the action level, 18 tests (19.4%) came in under 2 pCi/L, against 41.4% statewide, and 39 tests (41.9%) fell between 2 and 4, against 23.0% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 38.7% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.

The busiest year on file was 2023, with 93 tests reported; the quietest, 2014, had 14.

Share of reported tests at or above 4 pCi/L by year, Jackson County against Wisconsin2016 to 2023, years with 30 or more tests: Jackson County 38.2% to 38.7%, the state's pooled share 35.7% in 2023.
Jackson CountyWisconsin, pooled
Share of reported tests at or above 4 pCi/L by year, Jackson County against Wisconsin: data table
YearTestsJackson County, at or above 4 pCi/LWisconsin, pooled
20166838.2%45.2%
20175740.4%44.8%
20194742.6%42.9%
20214358.1%39.9%
20225141.2%42.9%
20239338.7%35.7%
Jackson County against Wisconsin, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Jackson County
Jackson County9338.7%3.2 pCi/LThis county
Wisconsin, pooled72 counties, pooled20,87935.7%Not pooled−3.0 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−5.3 points
Langlade Countyhighest in the state22565.8%6.0 pCi/L+27.1 points
Bayfield Countylowest in the state355.7%1.5 pCi/L−33.0 points
Trempealeau County, WIborders it11242.0%3.3 pCi/L+3.3 points
Eau Claire County, WIborders it47432.7%2.8 pCi/L−6.0 points
La Crosse County, WIborders it77131.4%2.7 pCi/L−7.3 points
Clark County, WIborders it7525.3%2.2 pCi/L−13.4 points
Monroe County, WIborders it21322.5%2.2 pCi/L−16.2 points
Wood County, WIborders it20818.3%1.4 pCi/L−20.4 points
Juneau County, WIborders it5010.0%1.1 pCi/L−28.7 points
Where Jackson County's reported results fell, 2023, beside Wisconsin and the United States
ResultJackson County testsJackson County shareWisconsin shareU.S. shareAgainst Wisconsin
Under 2 pCi/L1819.4%41.4%41.4%−22.0 points
2 to 4 pCi/L3941.9%23.0%25.2%+18.9 points
4 pCi/L and above3638.7%35.7%33.4%+3.0 points
Jackson County ranked among the 69 Wisconsin counties with 30 or more tests, by share at or above 4 pCi/L, 2023
CountyRankTestsAt or above 4 pCi/LMedian
Sauk County28 of 6924141.1%3.3 pCi/L
Oneida County29 of 6913540.7%2.7 pCi/L
Outagamie County30 of 6933740.7%3.1 pCi/L
Green Lake County31 of 697940.5%3.4 pCi/L
Forest County32 of 694540.0%2.9 pCi/L
Jackson County33 of 699338.7%3.2 pCi/L
Rusk County34 of 695738.6%3.2 pCi/L
Walworth County35 of 6934037.9%2.8 pCi/L
Dunn County36 of 6917137.4%2.9 pCi/L
St. Croix County37 of 6934837.4%3.0 pCi/L
Racine County38 of 6944537.3%2.7 pCi/L
Jackson County radon tests by year, against Wisconsin's pooled share
YearTestsAt or above 4 pCi/LMedianHighestWisconsin, pooledChange from the row before
20239338.7%3.2 pCi/L16.8 pCi/L35.7%−2.5 points
20225141.2%3.5 pCi/L16.2 pCi/L42.9%−16.9 points
20214358.1%4.8 pCi/L36.4 pCi/L39.9%+4.5 points
20202853.6%4.2 pCi/L9.9 pCi/L27.0%+11.0 points
20194742.6%3.3 pCi/L26.3 pCi/L42.9%+2.2 points
20175740.4%3.1 pCi/L36.4 pCi/L44.8%+2.2 points
20166838.2%2.7 pCi/L63.6 pCi/L45.2%−16.3 points
20152254.5%4.3 pCi/L47.5 pCi/L51.6%+18.8 points
20141435.7%2.6 pCi/L5.0 pCi/L51.1%First on file

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

Jackson County, Geology

The ground under Jackson County

Predicted

USGS's geologic map puts all of Jackson County's mapped land in one class: moderate radon potential. The map puts 87.2% of Jackson County in the area it calls Driftless Area and 12.8% in Central Plain/Northern Highland. USGS gives both a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Jackson County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Driftless AreaCambrian sandstone.Moderate1087.2%
Central Plain/Northern HighlandPre-Late Wisconsinan glacial deposits derived from sandstone and carbonate rocks.Moderate1012.8%

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

Jackson County beside the ground around it

Across Wisconsin 34.8% of the land is rated high; none of Jackson County's is. Of the 7 counties that border it, 5 have more high-potential ground, Wood County the most at 53.7%.

Share of land by USGS radon potential: Jackson County, the 7 counties bordering it and Wisconsin
AreaEPA zoneLow potentialModerate potentialHigh potential
Jackson CountyZone 2None100%None
Clark CountyZone 2None97.5%2.5%
Trempealeau CountyZone 2None65.7%34.3%
Monroe CountyZone 2None91.2%8.8%
La Crosse CountyZone 2None66.4%33.6%
Wood CountyZone 1None46.3%53.7%
Juneau CountyZone 2None100%None
Eau Claire CountyZone 2None100%None
Wisconsin72 counties, pooled by land areaVaries1.4%63.5%34.8%

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

Local help

Jackson County, Local resources

Radon testing and mitigation in Jackson County

What Wisconsin's program says
Phone
1-888-569-7236
Email
DHSRadon@dhs.wisconsin.gov
Licensing of radon professionals
The State of Wisconsin does not require contractors performing radon measurement or mitigation work to be state licensed or nationally certified.

What it means

Jackson County, Questions

Questions about radon in Jackson County

Are radon levels high in Jackson County?

In 2023, 38.7% of the radon tests reported to CDC for Jackson County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.2 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 32 reported a higher share; pooled, the state comes to 35.7%.

Which counties border Jackson County?

Jackson County borders 7 counties: Clark County, Trempealeau County, Monroe County, La Crosse County, Wood County, Juneau County and Eau Claire County.

Products

Jackson County, Products

Testing a home in Jackson County

In Jackson County, 38.7% of 93 tests reported to CDC in 2023 reached 4 pCi/L, against 35.7% pooled across Wisconsin. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Jackson County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Jackson County homes, compared

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Jackson County, Bordering counties

Counties bordering Jackson County

Calculated by Radon411

Jackson County, Cities and towns

Cities and towns in Jackson County

Jackson County's population has barely moved since 2020: 20,999 residents on July 1, 2025 against 21,096 then, by the Census Bureau's estimates. That works out to 21 people per square mile of land. No town dominates: Black River Falls, the largest, has 3,555 residents, 16.9% of the total. Together its 6 incorporated places hold 28.6% of those residents; the other 71.4% live outside any of them. CDC's 93 reported tests for 2023 work out to 4.4 per 1,000 residents (2025 estimate), close to Wisconsin's 3.5.

From Black River Falls to Hixton, CDC publishes no figure by town: each reads Jackson County's.

The cities and towns in Jackson County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Black River Falls3,555+1.3%16.9%
Merrillan544−3.4%2.6%
Melrose528−2.2%2.5%
Alma Center473−2.5%2.3%
Taylor468−3.1%2.2%
Hixton438−3.5%2.1%

6 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).

Jackson County, Homes

Homes in Jackson County

Jackson County is a place of houses on their own lots: 80% of its 9,693 homes are detached single-family houses, against 66% across Wisconsin. Half of its homes were built before 1978, close to Wisconsin's 1975: 30% date from before 1960 and 26% from 2000 or later. Owners live in 77% of the occupied homes (Wisconsin: 68%), so for most households a test and a fix are their own to order.

Homes in Jackson County, Wisconsin, 2019 to 2023
HomesJackson CountyWisconsin
Housing units9,6932,750,750
Detached houses80%66%
In buildings of 5 or more4%17%
Mobile homes11%3%
Built before 196030%34%
Built since 200026%20%
Middle year built19781975
Owner-occupied77%68%

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