Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Outagamie County, Wisconsin
EPA puts Outagamie County in Zone 2, its middle radon zone, and high results are common there: 40.7% of the 337 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
Share at 4+ pCi/L
40.7%
5.0 pts above WI
- Outagamie
- 40.7%
- Wisconsin
- 35.7%
337 tests, 2023
Median result
3.1pCi/L
Below action level
- Outagamie
- 3.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
337
18th of 69 by tests
- Outagamie
- 337
- Dane
- 2,887
Reported to CDC before any fix, 2023
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Wisconsin
30 of 69
Middle half
- Outagamie
- 40.7%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Outagamie County
Starts at Outagamie County's median, 3.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.1 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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. Outagamie County's median reported result, 2023.
The data
Outagamie County, At a glance
Outagamie County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Outagamie County is a
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 Outagamie County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 50.8% |
| 2015 | 54.6% |
| 2016 | 51.9% |
| 2017 | 53.7% |
| 2019 | 42.6% |
| 2020 | 49.3% |
| 2021 | 50.6% |
| 2022 | 48.8% |
| 2023 | 40.7% |
2023: 40.7%. Across these years the share ran from 40.7% to 54.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 337 tests reported to CDC for Outagamie 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).
Outagamie County, Compared
Outagamie County radon figures, compared
Calculated by Radon411In Outagamie County, about 4 in 10 reported tests in 2023 (137 of 337) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 7.3 points higher. Across 72 Wisconsin counties pooled together, 35.7% of tests reached that level, so Outagamie County runs 5.0 points above its state.
Of 5 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 23.0% (Brown County) to 57.0% (Shawano County). By share, Outagamie County is 30th of 69 Wisconsin counties with 30 or more tests for the same period.
Year by year, 2014 opened at 50.8% and 2023 closed at 40.7% (down 10.1 points), with 2015 the high at 54.6%. Half the tests came in under 3.1 pCi/L and half over it; the single highest reached 52.1 pCi/L. Below the action level, 127 tests (37.7%) came in under 2 pCi/L, against 41.4% statewide, and 73 tests (21.7%) 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 40.7% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 12 tests taken after mitigation in Outagamie County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2015, with 447 tests reported; the quietest, 2020, had 207.
Outagamie CountyWisconsin, pooled
| Year | Tests | Outagamie County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 421 | 50.8% | 51.1% |
| 2015 | 447 | 54.6% | 51.6% |
| 2016 | 397 | 51.9% | 45.2% |
| 2017 | 374 | 53.7% | 44.8% |
| 2019 | 230 | 42.6% | 42.9% |
| 2020 | 207 | 49.3% | 27.0% |
| 2021 | 237 | 50.6% | 39.9% |
| 2022 | 217 | 48.8% | 42.9% |
| 2023 | 337 | 40.7% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Outagamie County, Geology
The ground under Outagamie County
PredictedUSGS's geologic map puts all of Outagamie County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Green Bay Lobe, to which USGS gives a radon index of 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Green Bay Lobe | Glacial deposits derived from carbonate and igneous rocks. | Moderate | 10 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Outagamie County beside the ground around it
Across Wisconsin 34.8% of the land is rated high; none of Outagamie County's is. Of the 5 counties that border it, 4 have more high-potential ground, Waupaca County the most at 63.4%.
The map rates the ground, not the air in any home.
Local help
Outagamie County, Local resources
Radon testing and mitigation in Outagamie County
- Wisconsin's radon programWisconsin Department of Health ServicesWisconsin's radon program does not license radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Wisconsin.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
We recommend starting with your regional Radon Information Center since many centers provide test kits for free or reduced cost, and often with laboratory fees covered.
- Compare kits
- Professionals in Wisconsin19 professionals are listed in Wisconsin.
What Wisconsin's program says
- Phone
- 1-888-569-7236
- 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
Outagamie County, Questions
Questions about radon in Outagamie County
Are radon levels high in Outagamie County?
In 2023, 40.7% of the radon tests reported to CDC for Outagamie County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.1 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 29 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Outagamie County?
Outagamie County borders 5 counties: Winnebago County, Brown County, Calumet County, Waupaca County and Shawano County.
Products
Outagamie County, Products
Testing a home in Outagamie County
In Outagamie County, 40.7% of 337 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 Outagamie County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Monitor
RadonPro Wi-Fi radon monitor with a built-in Geiger counter
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Outagamie County, Bordering counties
Counties bordering Outagamie County
Calculated by Radon411- Radon levels in Shawano CountyEPA zone 1
57.0%at or above 4 pCi/L
Median 5.0 pCi/L · 114 tests · 16.3 points above Outagamie County
- Radon levels in Waupaca CountyEPA zone 1
52.8%at or above 4 pCi/L
Median 4.3 pCi/L · 127 tests · 12.1 points above Outagamie County
- Radon levels in Calumet CountyEPA zone 2
51.6%at or above 4 pCi/L
Median 4.4 pCi/L · 122 tests · 10.9 points above Outagamie County
- Radon levels in Winnebago CountyEPA zone 2
42.4%at or above 4 pCi/L
Median 3.1 pCi/L · 512 tests · 1.7 points above Outagamie County
- Radon levels in Brown CountyEPA zone 2
23.0%at or above 4 pCi/L
Median 1.4 pCi/L · 551 tests · 17.7 points below Outagamie County
Outagamie County, Cities and towns
Cities and towns in Outagamie County
The Census Bureau estimates 195,894 residents in Outagamie County for July 1, 2025, 4,935 more than in 2020 (+2.6%). That works out to 307 people per square mile of land. Appleton, the largest place on its list (75,452 residents in all), extends beyond Outagamie County, so no share of the total is worked out for it. Reported testing is thin here: 337 tests over 2023, or 1.7 for every 1,000 residents (2025 estimate), where Wisconsin as a whole comes to 3.5.
From Appleton to Nichols, CDC publishes no figure by town: each reads Outagamie County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Appletonextends beyond Outagamie County | 75,452 | −0.2% | Counted whole |
| Howardextends beyond Outagamie County | 22,233 | +11.2% | Counted whole |
| Kaukaunaextends beyond Outagamie County | 18,517 | +8.1% | Counted whole |
| Little Chute | 11,800 | +0.4% | 6.0% |
| New Londonextends beyond Outagamie County | 7,726 | +5.0% | Counted whole |
| Kimberly | 7,556 | +2.9% | 3.9% |
| Wrightstownextends beyond Outagamie County | 4,169 | +30.7% | Counted whole |
| Seymour | 3,628 | +2.5% | 1.9% |
| Combined Locks | 3,626 | −0.2% | 1.9% |
| Hortonville | 3,340 | +9.9% | 1.7% |
| Black Creek | 1,335 | −1.6% | 0.7% |
| Shiocton | 935 | −0.7% | 0.5% |
Places in Outagamie County with a city page: 1 of 1
- Bear Creek
- Nichols
14 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Outagamie County is counted whole, so it has no share.
Outagamie County, Homes
Homes in Outagamie County
Of Outagamie County's 79,900 homes, 71% are detached houses, against 66% across Wisconsin; 15% are in buildings of five or more homes. Half of its homes were built before 1979, close to Wisconsin's 1975: 29% date from before 1960 and 23% from 2000 or later. 72% of occupied homes are lived in by their owner (Wisconsin: 68%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Outagamie County | Wisconsin |
|---|---|---|
| Housing units | 79,900 | 2,750,750 |
| Detached houses | 71% | 66% |
| In buildings of 5 or more | 15% | 17% |
| Mobile homes | 1% | 3% |
| Built before 1960 | 29% | 34% |
| Built since 2000 | 23% | 20% |
| Middle year built | 1979 | 1975 |
| Owner-occupied | 72% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.