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Radon Levels in Langlade County, Wisconsin

EPA puts Langlade County in Zone 1, its highest radon zone, and high results are common there: 65.8% of the 225 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

    65.8%

    30.1 pts above WI

    Langlade
    65.8%
    Wisconsin
    35.7%

    225 tests, 2023

  • Median result

    6.0pCi/L

    Action level reached

    Langlade
    6.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    225

    26th of 69 by tests

    Langlade
    225
    Dane
    2,887

    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 Wisconsin

    1 of 69

    Top quarter

    Langlade
    65.8%
    Langlade
    65.8%

    By share, of 69 with 30+ tests

Read a result for Langlade County

Starts at Langlade County's median, 6.0 pCi/L

6.0pCi/L

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

EPA’s reading of 6.0 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. Langlade County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Langlade County, At a glance

Langlade County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Langlade 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 55% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Langlade County, 2023

Share of reported tests at or above 4 pCi/L, by year, Langlade County
Share of reported tests at or above 4 pCi/L, by year, Langlade County
YearShare of reported tests at or above 4 pCi/L
201461.7%
201563.2%
201662.9%
201763.0%
201961.1%
202063.9%
202166.1%
202267.3%
202365.8%

2023: 65.8%. Across these years the share ran from 61.1% to 67.3%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 225 tests reported to CDC for Langlade 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

Langlade County, Compared

Langlade County radon figures, compared

Calculated by Radon411

More than half: 65.8% of the 225 radon tests reported to CDC for Langlade County in 2023 read at least 4 pCi/L. That places it 1st of 69 Wisconsin counties with 30 or more tests for the same period. That is 30.1 points above the 35.7% pooled from 72 Wisconsin counties.

The median result, 6.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 84.8 pCi/L. The rest split 16.9% under 2 pCi/L and 17.3% from 2 to 4 (Wisconsin: 41.4% and 23.0%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 65.8% share point the same way here.

No bordering county with a figure for the same period reported a higher share; the closest is Shawano County at 57.0%, the lowest Lincoln County at 23.5%. Statewide for the same period, Iowa County reported the highest share (61.0%) and Bayfield County the lowest (5.7%).

The busiest year on file was 2023, with 225 tests reported; the quietest, 2019, had 36.

Over 9 years of annual figures the share rose 4.1 points, from 61.7% in 2014 to 65.8% in 2023; its peak was 67.3% in 2022. Nationally, every county with a figure for the same period pools to 33.4%; Langlade County sits 32.4 points above it. CDC also counts 13 tests taken after mitigation in Langlade County for the same period: tests in homes where a fix was already in.

Share of reported tests at or above 4 pCi/L by year, Langlade County against Wisconsin2014 to 2023, years with 30 or more tests: Langlade County 61.7% to 65.8%, the state's pooled share 35.7% in 2023.
Langlade CountyWisconsin, pooled
Share of reported tests at or above 4 pCi/L by year, Langlade County against Wisconsin: data table
YearTestsLanglade County, at or above 4 pCi/LWisconsin, pooled
20146061.7%51.1%
20155763.2%51.6%
201612462.9%45.2%
20175463.0%44.8%
20193661.1%42.9%
20207263.9%27.0%
20215666.1%39.9%
20225267.3%42.9%
202322565.8%35.7%
Langlade County against Wisconsin, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Langlade County
Langlade County22565.8%6.0 pCi/LThis county
Wisconsin, pooled72 counties, pooled20,87935.7%Not pooled−30.1 points
United States, pooled642 counties, pooled128,74033.4%Not pooled−32.4 points
Iowa Countyhighest in the state14661.0%4.8 pCi/L−4.8 points
Bayfield Countylowest in the state355.7%1.5 pCi/L−60.1 points
Menominee County, WIborders it3100.0%11.0 pCi/L+34.2 points
Shawano County, WIborders it11457.0%5.0 pCi/L−8.8 points
Oconto County, WIborders it13052.3%4.5 pCi/L−13.5 points
Marathon County, WIborders it34951.9%4.3 pCi/L−13.9 points
Oneida County, WIborders it13540.7%2.7 pCi/L−25.1 points
Forest County, WIborders it4540.0%2.9 pCi/L−25.8 points
Lincoln County, WIborders it8123.5%2.1 pCi/L−42.3 points
Where Langlade County's reported results fell, 2023, beside Wisconsin and the United States
ResultLanglade County testsLanglade County shareWisconsin shareU.S. shareAgainst Wisconsin
Under 2 pCi/L3816.9%41.4%41.4%−24.5 points
2 to 4 pCi/L3917.3%23.0%25.2%−5.7 points
4 pCi/L and above14865.8%35.7%33.4%+30.1 points
Langlade 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
Langlade County1 of 6922565.8%6.0 pCi/L
Iowa County2 of 6914661.0%4.8 pCi/L
Shawano County3 of 6911457.0%5.0 pCi/L
Dodge County4 of 6925754.9%4.8 pCi/L
Crawford County5 of 6921753.9%4.4 pCi/L
Buffalo County6 of 695653.6%4.4 pCi/L
Waupaca County7 of 6912752.8%4.3 pCi/L
Oconto County8 of 6913052.3%4.5 pCi/L
Lafayette County9 of 694652.2%4.2 pCi/L
Marathon County10 of 6934951.9%4.3 pCi/L
Calumet County11 of 6912251.6%4.4 pCi/L
Langlade County radon tests by year, against Wisconsin's pooled share
YearTestsAt or above 4 pCi/LMedianHighestWisconsin, pooledChange from the row before
202322565.8%6.0 pCi/L84.8 pCi/L35.7%−1.5 points
20225267.3%6.4 pCi/L103.1 pCi/L42.9%+1.2 points
20215666.1%4.9 pCi/L17.9 pCi/L39.9%+2.2 points
20207263.9%5.6 pCi/L101.1 pCi/L27.0%+2.8 points
20193661.1%5.2 pCi/L36.6 pCi/L42.9%−1.9 points
20175463.0%5.3 pCi/L67.8 pCi/L44.8%+0.1 points
201612462.9%6.0 pCi/L88.5 pCi/L45.2%−0.3 points
20155763.2%6.6 pCi/L27.7 pCi/L51.6%+1.5 points
20146061.7%5.7 pCi/L53.3 pCi/L51.1%First on file

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

Langlade County, Geology

The ground under Langlade County

Predicted

USGS's geologic map splits Langlade County: 55.1% of its land is high radon potential and 44.9% moderate. The map puts 55.1% of Langlade County in the area it calls Wolf River Batholith and 34.9% in Chippewa, Wisconsin Valley, and Langlade sublobes of the Superior Lobe, with one smaller area beside them. USGS gives the first a radon index of 13, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Langlade County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Wolf River BatholithPlutonic granitic rocks including quartz monzonite, syenite, monzonite, anorthosite.High1355.1%
Chippewa, Wisconsin Valley, and Langlade sublobes of the Superior LobeGranite, granite-derived glacial deposits, and mafic volcanic rocks.Moderate1034.9%
Central Plain/Northern HighlandPre-Late Wisconsinan glacial deposits derived from sandstone and carbonate rocks.Moderate1010.0%

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

Langlade County beside the ground around it

Langlade County has more high-potential ground than Wisconsin as a whole: 55.1% of its land against 34.8%. Of the 7 counties that border it, 3 have more high-potential ground, Menominee County the most at 98.0%.

Share of land by USGS radon potential: Langlade County, the 7 counties bordering it and Wisconsin
AreaEPA zoneLow potentialModerate potentialHigh potential
Langlade CountyZone 1None44.9%55.1%
Menominee CountyZone 1None2.0%98.0%
Lincoln CountyZone 2None100%None
Shawano CountyZone 1None36.7%63.3%
Forest CountyZone 2None97.3%2.7%
Oneida CountyZone 2None100%None
Oconto CountyZone 2None67.2%32.6%
Marathon CountyZone 1None16.0%84.0%
Wisconsin72 counties, pooled by land areaVaries1.4%63.5%34.8%

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

Local help

Langlade County, Local resources

Radon testing and mitigation in Langlade 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

Langlade County, Questions

Questions about radon in Langlade County

Are radon levels high in Langlade County?

In 2023, 65.8% of the radon tests reported to CDC for Langlade County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.0 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 35.7%.

Which counties border Langlade County?

Langlade County borders 7 counties: Menominee County, Lincoln County, Shawano County, Forest County, Oneida County, Oconto County and Marathon County.

Products

Langlade County, Products

Testing a home in Langlade County

In Langlade County, 65.8% of 225 tests reported to CDC in 2023 reached 4 pCi/L, against 35.7% pooled across Wisconsin. In Zone 1 the year-round level in Langlade 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

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

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Langlade County, Bordering counties

Counties bordering Langlade County

Calculated by Radon411

Langlade County, Cities and towns

Cities and towns in Langlade County

Langlade County's population has barely moved since 2020: 19,534 residents on July 1, 2025 against 19,465 then, by the Census Bureau's estimates. That works out to 22 people per square mile of land. Its largest town, Antigo, has 8,060 residents, 41.3% of the total. Together its 2 incorporated places hold 42.6% of those residents; the other 57.4% live outside any of them. Testing is reported here more often than across the state: CDC's 225 reported tests for 2023 come to 11.5 for every 1,000 residents (2025 estimate), against 3.5 for Wisconsin.

From Antigo to White Lake, CDC publishes no figure by town: each reads Langlade County's.

The cities and towns in Langlade County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Antigo8,060−0.1%41.3%
White Lake259−0.8%1.3%

2 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).

Langlade County, Homes

Homes in Langlade County

Langlade County is a place of houses on their own lots: 81% of its 12,202 homes are detached single-family houses, against 66% across Wisconsin. Half of its homes were built before 1972, close to Wisconsin's 1975: 38% date from before 1960 and 17% from 2000 or later. Owners live in 78% of the occupied homes (Wisconsin: 68%), so for most households a test and a fix are their own to order.

Homes in Langlade County, Wisconsin, 2019 to 2023
HomesLanglade CountyWisconsin
Housing units12,2022,750,750
Detached houses81%66%
In buildings of 5 or more7%17%
Mobile homes6%3%
Built before 196038%34%
Built since 200017%20%
Middle year built19721975
Owner-occupied78%68%

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