Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Oneida County, Wisconsin
EPA puts Oneida County in Zone 2, its middle radon zone, and high results are common there: 40.7% of the 135 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
- Oneida
- 40.7%
- Wisconsin
- 35.7%
135 tests, 2023
Median result
2.7pCi/L
Below action level
- Oneida
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
135
38th of 69 by tests
- Oneida
- 135
- 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
29 of 69
Middle half
- Oneida
- 40.7%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Oneida County
Starts at Oneida County's median, 2.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.7 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. Oneida County's median reported result, 2023.
The data
Oneida County, At a glance
Oneida County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Oneida 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 Oneida County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 38.8% |
| 2015 | 43.6% |
| 2016 | 33.9% |
| 2017 | 29.4% |
| 2019 | 26.1% |
| 2020 | 32.7% |
| 2021 | 31.8% |
| 2022 | 32.3% |
| 2023 | 40.7% |
2023: 40.7%. Across these years the share ran from 26.1% to 43.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 135 tests reported to CDC for Oneida 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).
Oneida County, Compared
Oneida County radon figures, compared
Calculated by Radon411In Oneida County, about 4 in 10 reported tests in 2023 (55 of 135) 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 Oneida County runs 5.0 points above its state.
Of 5 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 21.7% (Vilas County) to 65.8% (Langlade County). By share, Oneida County is 29th of 69 Wisconsin counties with 30 or more tests for the same period.
Year by year, 2014 opened at 38.8% and 2023 closed at 40.7% (about level), with 2015 the high at 43.6%. Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 36.0 pCi/L. Below the action level, 36 tests (26.7%) came in under 2 pCi/L, against 41.4% statewide, and 44 tests (32.6%) 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.
The busiest year on file was 2019, with 238 tests reported; the quietest, 2023, had 135.
Oneida CountyWisconsin, pooled
| Year | Tests | Oneida County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 232 | 38.8% | 51.1% |
| 2015 | 227 | 43.6% | 51.6% |
| 2016 | 180 | 33.9% | 45.2% |
| 2017 | 177 | 29.4% | 44.8% |
| 2019 | 238 | 26.1% | 42.9% |
| 2020 | 223 | 32.7% | 27.0% |
| 2021 | 176 | 31.8% | 39.9% |
| 2022 | 189 | 32.3% | 42.9% |
| 2023 | 135 | 40.7% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Oneida County, Geology
The ground under Oneida County
PredictedUSGS's geologic map puts all of Oneida County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Chippewa, Wisconsin Valley, and Langlade sublobes of the Superior 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 |
|---|---|---|---|---|
| Chippewa, Wisconsin Valley, and Langlade sublobes of the Superior Lobe | Granite, granite-derived glacial deposits, and mafic volcanic 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.
Oneida County beside the ground around it
Across Wisconsin 34.8% of the land is rated high; none of Oneida County's is. Of the 5 counties that border it, 2 have more high-potential ground, Langlade County the most at 55.1%.
The map rates the ground, not the air in any home.
Local help
Oneida County, Local resources
Radon testing and mitigation in Oneida 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
Oneida County, Questions
Questions about radon in Oneida County
Are radon levels high in Oneida County?
In 2023, 40.7% of the radon tests reported to CDC for Oneida County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 28 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Oneida County?
Oneida County borders 5 counties: Vilas County, Forest County, Lincoln County, Langlade County and Price County.
Products
Oneida County, Products
Testing a home in Oneida County
In Oneida County, 40.7% of 135 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 Oneida 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
MonitorSafetySiren
Pro4 plug-in radon detector with a display and alarm
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 48 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Oneida County, Bordering counties
Counties bordering Oneida County
Calculated by Radon411- Radon levels in Langlade CountyEPA zone 1
65.8%at or above 4 pCi/L
Median 6.0 pCi/L · 225 tests · 25.1 points above Oneida County
- Radon levels in Forest CountyEPA zone 2
40.0%at or above 4 pCi/L
Median 2.9 pCi/L · 45 tests · 0.7 points below Oneida County
- Radon levels in Price CountyEPA zone 2
36.7%at or above 4 pCi/L
Median 2.8 pCi/L · 60 tests · 4.0 points below Oneida County
- Radon levels in Lincoln CountyEPA zone 2
23.5%at or above 4 pCi/L
Median 2.1 pCi/L · 81 tests · 17.2 points below Oneida County
- Radon levels in Vilas CountyEPA zone 2
21.7%at or above 4 pCi/L
Median 2.1 pCi/L · 106 tests · 19.0 points below Oneida County
Oneida County, Cities and towns
Cities and towns in Oneida County
The Census Bureau estimates 38,131 residents in Oneida County for July 1, 2025, 267 more than in 2020 (+0.7%). That works out to 34 people per square mile of land. Rhinelander, its one incorporated place, has 8,242 residents, 21.6% of the total. CDC's 135 reported tests for 2023 work out to 3.5 per 1,000 residents (2025 estimate), close to Wisconsin's 3.5.
Rhinelander is the one incorporated place here; CDC publishes no figure by town, so it reads Oneida County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Rhinelander | 8,242 | −0.5% | 21.6% |
One incorporated place, 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).
Oneida County, Homes
Homes in Oneida County
Oneida County is a place of houses on their own lots: 85% of its 30,746 homes are detached single-family houses, against 66% across Wisconsin. Half of its homes were built before 1981, close to Wisconsin's 1975: 23% date from before 1960 and 21% from 2000 or later. Owners live in 84% of the occupied homes (Wisconsin: 68%), so for most households a test and a fix are their own to order.
| Homes | Oneida County | Wisconsin |
|---|---|---|
| Housing units | 30,746 | 2,750,750 |
| Detached houses | 85% | 66% |
| In buildings of 5 or more | 5% | 17% |
| Mobile homes | 5% | 3% |
| Built before 1960 | 23% | 34% |
| Built since 2000 | 21% | 20% |
| Middle year built | 1981 | 1975 |
| Owner-occupied | 84% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.