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Radon Levels in Waushara County, Wisconsin

EPA puts Waushara County in Zone 2, its middle radon zone, and 25.4% of its 71 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

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  • Share at 4+ pCi/L

    25.4%

    10.3 pts below WI

    Waushara
    25.4%
    Wisconsin
    35.7%

    71 tests, 2023

  • Median result

    1.9pCi/L

    Below action level

    Waushara
    1.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    71

    50th of 69 by tests

    Waushara
    71
    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

    53 of 69

    Lowest quarter

    Waushara
    25.4%
    Langlade
    65.8%

    By share, of 69 with 30+ tests

Read a result for Waushara County

Starts at Waushara County's median, 1.9 pCi/L

1.9pCi/L

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

EPA’s reading of 1.9 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Waushara County's median reported result, 2023.

Interpret this reading

The data

Waushara County, At a glance

Waushara County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Waushara 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 Waushara County, 2023

Share of reported tests at or above 4 pCi/L, by year, Waushara County
Share of reported tests at or above 4 pCi/L, by year, Waushara County
YearShare of reported tests at or above 4 pCi/L
201442.1%
201548.0%
201631.0%
201738.6%
201929.3%
202036.5%
202132.1%
202234.1%
202325.4%

2023: 25.4%. Across these years the share ran from 25.4% to 48.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 71 tests reported to CDC for Waushara 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

Waushara County, Compared

Waushara County radon figures, compared

Calculated by Radon411

Waushara County's 71 reported tests in 2023 had a middle value of 1.9 pCi/L and a maximum of 15.9 pCi/L, and 25.4% reached 4 pCi/L. Wisconsin as a whole (72 Wisconsin counties, pooled) comes to 35.7%: 10.3 points higher than here.

Among its state's counties it ranks 53rd of 69 Wisconsin counties with 30 or more tests for the same period. Statewide for the same period, Langlade County reported the highest share (65.8%) and Bayfield County the lowest (5.7%).

Below the action level, 36 tests (50.7%) came in under 2 pCi/L, against 41.4% statewide, and 17 tests (23.9%) fell between 2 and 4, against 23.0% statewide. The busiest year on file was 2016, with 145 tests reported; the quietest, 2014, had 38.

EPA's 1993 zone map puts Waushara County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Next door, the shares run from 15.0% in Marquette County to 52.8% in Waupaca County, with Adams County and Marquette County below Waushara County. Over 9 years of annual figures the share fell 16.7 points, from 42.1% in 2014 to 25.4% in 2023; its peak was 48.0% in 2015.

Share of reported tests at or above 4 pCi/L by year, Waushara County against Wisconsin2014 to 2023, years with 30 or more tests: Waushara County 42.1% to 25.4%, the state's pooled share 35.7% in 2023.
Waushara CountyWisconsin, pooled
Share of reported tests at or above 4 pCi/L by year, Waushara County against Wisconsin: data table
YearTestsWaushara County, at or above 4 pCi/LWisconsin, pooled
20143842.1%51.1%
20155048.0%51.6%
201614531.0%45.2%
20178338.6%44.8%
20197529.3%42.9%
20207436.5%27.0%
20215332.1%39.9%
20224134.1%42.9%
20237125.4%35.7%
Waushara County against Wisconsin, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Waushara County
Waushara County7125.4%1.9 pCi/LThis county
Wisconsin, pooled72 counties, pooled20,87935.7%Not pooled+10.3 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+8.0 points
Langlade Countyhighest in the state22565.8%6.0 pCi/L+40.4 points
Bayfield Countylowest in the state355.7%1.5 pCi/L−19.7 points
Waupaca County, WIborders it12752.8%4.3 pCi/L+27.4 points
Winnebago County, WIborders it51242.4%3.1 pCi/L+17.0 points
Green Lake County, WIborders it7940.5%3.4 pCi/L+15.1 points
Portage County, WIborders it33435.6%3.0 pCi/L+10.2 points
Adams County, WIborders it4820.8%1.7 pCi/L−4.6 points
Marquette County, WIborders it4015.0%1.3 pCi/L−10.4 points
Where Waushara County's reported results fell, 2023, beside Wisconsin and the United States
ResultWaushara County testsWaushara County shareWisconsin shareU.S. shareAgainst Wisconsin
Under 2 pCi/L3650.7%41.4%41.4%+9.3 points
2 to 4 pCi/L1723.9%23.0%25.2%+0.9 points
4 pCi/L and above1825.4%35.7%33.4%−10.3 points
Waushara 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
La Crosse County48 of 6977131.4%2.7 pCi/L
Manitowoc County49 of 6920931.1%2.2 pCi/L
Pierce County50 of 6913630.9%2.7 pCi/L
Ashland County51 of 694129.3%2.3 pCi/L
Columbia County52 of 6916328.8%2.0 pCi/L
Waushara County53 of 697125.4%1.9 pCi/L
Clark County54 of 697525.3%2.2 pCi/L
Lincoln County55 of 698123.5%2.1 pCi/L
Burnett County56 of 695223.1%1.6 pCi/L
Brown County57 of 6955123.0%1.4 pCi/L
Monroe County58 of 6921322.5%2.2 pCi/L
Waushara County radon tests by year, against Wisconsin's pooled share
YearTestsAt or above 4 pCi/LMedianHighestWisconsin, pooledChange from the row before
20237125.4%1.9 pCi/L15.9 pCi/L35.7%−8.7 points
20224134.1%2.9 pCi/L18.8 pCi/L42.9%+2.0 points
20215332.1%3.0 pCi/L27.6 pCi/L39.9%−4.4 points
20207436.5%2.5 pCi/L14.3 pCi/L27.0%+7.2 points
20197529.3%2.6 pCi/L15.6 pCi/L42.9%−9.3 points
20178338.6%2.3 pCi/L13.1 pCi/L44.8%+7.6 points
201614531.0%2.5 pCi/L23.1 pCi/L45.2%−17.0 points
20155048.0%2.8 pCi/L24.6 pCi/L51.6%+5.9 points
20143842.1%3.0 pCi/L22.6 pCi/L51.1%First on file

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

Waushara County, Geology

The ground under Waushara County

Predicted

USGS's geologic map puts all of Waushara County's mapped land in one class: moderate radon potential. The map puts 90.3% of Waushara County in the area it calls Green Bay Lobe and 9.7% 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 Waushara County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Green Bay LobeGlacial deposits derived from carbonate and igneous rocks.Moderate1090.3%
Central Plain/Northern HighlandPre-Late Wisconsinan glacial deposits derived from sandstone and carbonate rocks.Moderate109.7%

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

Waushara County beside the ground around it

Across Wisconsin 34.8% of the land is rated high; none of Waushara County's is. Of the 6 counties that border it, 4 have more high-potential ground, Portage County the most at 76.0%.

Share of land by USGS radon potential: Waushara County, the 6 counties bordering it and Wisconsin
AreaEPA zoneLow potentialModerate potentialHigh potential
Waushara CountyZone 2None100%None
Marquette CountyZone 2None100%None
Portage CountyZone 1None24.0%76.0%
Waupaca CountyZone 1None36.6%63.4%
Green Lake CountyZone 1None57.5%42.5%
Adams CountyZone 2None100%None
Winnebago CountyZone 2None81.5%18.5%
Wisconsin72 counties, pooled by land areaVaries1.4%63.5%34.8%

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

Local help

Waushara County, Local resources

Radon testing and mitigation in Waushara 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

Waushara County, Questions

Questions about radon in Waushara County

Are radon levels high in Waushara County?

In 2023, 25.4% of the radon tests reported to CDC for Waushara County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.9 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 52 reported a higher share; pooled, the state comes to 35.7%.

Which counties border Waushara County?

Waushara County borders 6 counties: Marquette County, Portage County, Waupaca County, Green Lake County, Adams County and Winnebago County.

Products

Waushara County, Products

Testing a home in Waushara County

In Waushara County, 25.4% of 71 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 Waushara County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Waushara County homes, compared

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Waushara County, Bordering counties

Counties bordering Waushara County

Calculated by Radon411

Waushara County, Cities and towns

Cities and towns in Waushara County

The Census Bureau estimates 25,223 residents in Waushara County for July 1, 2025, 691 more than in 2020 (+2.8%). That works out to 40 people per square mile of land. Berlin, the largest place on its list (5,588 residents in all), extends beyond Waushara County, so no share of the total is worked out for it. CDC's 71 reported tests for 2023 work out to 2.8 per 1,000 residents (2025 estimate), close to Wisconsin's 3.5.

From Berlin to Hancock, CDC publishes no figure by town: each reads Waushara County's.

The cities and towns in Waushara County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Berlinextends beyond Waushara County5,588+0.2%Counted whole
Wautoma2,411+9.0%9.6%
Redgranite2,113+2.2%8.4%
Plainfield926+0.1%3.7%
Wild Rose799+2.3%3.2%
Coloma444+0.7%1.8%
Lohrville437+1.2%1.7%
Hancock399+1.3%1.6%

8 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 Waushara County is counted whole, so it has no share.

Waushara County, Homes

Homes in Waushara County

Waushara County is a place of houses on their own lots: 84% of its 14,804 homes are detached single-family houses, against 66% across Wisconsin. Half of its homes were built before 1977, close to Wisconsin's 1975: 30% date from before 1960 and 19% from 2000 or later. Owners live in 83% of the occupied homes (Wisconsin: 68%), so for most households a test and a fix are their own to order.

Homes in Waushara County, Wisconsin, 2019 to 2023
HomesWaushara CountyWisconsin
Housing units14,8042,750,750
Detached houses84%66%
In buildings of 5 or more4%17%
Mobile homes9%3%
Built before 196030%34%
Built since 200019%20%
Middle year built19771975
Owner-occupied83%68%

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