Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Kenosha County, Wisconsin
EPA puts Kenosha County in Zone 2, its middle radon zone, and high results are common there: 42.4% of the 415 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
42.4%
6.7 pts above WI
- Kenosha
- 42.4%
- Wisconsin
- 35.7%
415 tests, 2023
Median result
3.4pCi/L
Below action level
- Kenosha
- 3.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
415
12th of 69 by tests
- Kenosha
- 415
- 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
24 of 69
Middle half
- Kenosha
- 42.4%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Kenosha County
Starts at Kenosha County's median, 3.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.4 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. Kenosha County's median reported result, 2023.
The data
Kenosha County, At a glance
Kenosha County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Kenosha County is a
USGS geologic potential: Moderate across 67% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Kenosha County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 58.0% |
| 2015 | 49.4% |
| 2016 | 47.3% |
| 2017 | 41.9% |
| 2019 | 45.9% |
| 2020 | 51.8% |
| 2021 | 45.8% |
| 2022 | 27.1% |
| 2023 | 42.4% |
2023: 42.4%. Across these years the share ran from 27.1% to 58.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 415 tests reported to CDC for Kenosha 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).
Kenosha County, Compared
Kenosha County radon figures, compared
Calculated by Radon411In Kenosha County, about 4 in 10 reported tests in 2023 (176 of 415) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 9.0 points higher. Across 72 Wisconsin counties pooled together, 35.7% of tests reached that level, so Kenosha County runs 6.7 points above its state.
Of 2 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 37.3% (Racine County) to 37.9% (Walworth County). By share, Kenosha County is 24th of 69 Wisconsin counties with 30 or more tests for the same period.
Year by year, 2014 opened at 58.0% and 2023 closed at 42.4% (down 15.6 points), with 2014 the high at 58.0%. Half the tests came in under 3.4 pCi/L and half over it; the single highest reached 48.8 pCi/L. Below the action level, 154 tests (37.1%) came in under 2 pCi/L, against 41.4% statewide, and 85 tests (20.5%) 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 42.4% share point the same way here. USGS geology rates 67% of the county's land moderate radon potential. CDC also counts 15 tests taken after mitigation in Kenosha County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2015, with 478 tests reported; the quietest, 2021, had 131.
Kenosha CountyWisconsin, pooled
| Year | Tests | Kenosha County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 367 | 58.0% | 51.1% |
| 2015 | 478 | 49.4% | 51.6% |
| 2016 | 395 | 47.3% | 45.2% |
| 2017 | 210 | 41.9% | 44.8% |
| 2019 | 196 | 45.9% | 42.9% |
| 2020 | 168 | 51.8% | 27.0% |
| 2021 | 131 | 45.8% | 39.9% |
| 2022 | 258 | 27.1% | 42.9% |
| 2023 | 415 | 42.4% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Kenosha County, Geology
The ground under Kenosha County
PredictedUSGS's geologic map splits Kenosha County: 67.3% of its land is moderate radon potential and 32.6% high. The map puts 66.4% of Kenosha County in the area it calls Eastern Ridges and Lowlands and 32.0% in Eastern Ridges and Lowlands, with 2 smaller areas beside them. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Eastern Ridges and Lowlands | Carbonate-rich glacial silt, clay. | Moderate | 10 | 66.4% |
| Eastern Ridges and Lowlands | Glacial deposits derived from Ordovician carbonate rocks. | High | 12 | 32.0% |
| Wheaton Morainal Country | Glacial lake deposits and clay-rich glacial till. | Moderate | 11 | 0.9% |
| Bloomington Ridged Plain | Wisconsinan glacial deposits and loess over Paleozoic sedimentary rocks. | High | 13 | 0.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Kenosha County beside the ground around it
On high-potential ground Kenosha County is close to Wisconsin as a whole: 32.6% of its land against 34.8%. Of the 4 counties that border it, 2 have more high-potential ground, McHenry County, IL the most at 100%.
The map rates the ground, not the air in any home.
Local help
Kenosha County, Local resources
Radon testing and mitigation in Kenosha County
Listed radon businesses with an address in Kenosha 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.
Listed radon professionals by town: Kenosha, Pleasant Prairie, Genoa City
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
Kenosha County, Questions
Questions about radon in Kenosha County
Are radon levels high in Kenosha County?
In 2023, 42.4% of the radon tests reported to CDC for Kenosha County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.4 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 23 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Kenosha County?
Kenosha County borders 4 counties: Racine County, WI, Lake County, IL, McHenry County, IL and Walworth County, WI.
Products
Kenosha County, Products
Testing a home in Kenosha County
In Kenosha County, 42.4% of 415 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 Kenosha County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorForensics Detectors
FD-65-RADON rechargeable radon detector with a color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Kenosha County, Bordering counties
Counties bordering Kenosha County
Calculated by Radon411- Radon levels in Walworth County, WIEPA zone 1
37.9%at or above 4 pCi/L
Median 2.8 pCi/L · 340 tests · 4.5 points below Kenosha County
- Radon levels in Racine County, WIEPA zone 2
37.3%at or above 4 pCi/L
Median 2.7 pCi/L · 445 tests · 5.1 points below Kenosha County
- Radon levels in Lake County, ILEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in McHenry County, ILEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
Kenosha County, Cities and towns
Cities and towns in Kenosha County
Kenosha County's population has barely moved since 2020: 168,448 residents on July 1, 2025 against 169,186 then, by the Census Bureau's estimates. That works out to 620 people per square mile of land. Kenosha alone is home to 99,239 of them, 58.9% of the total. CDC's 415 reported tests for 2023 work out to 2.5 per 1,000 residents (2025 estimate), close to Wisconsin's 3.5.
From Kenosha to Genoa City, CDC publishes no figure by town: each reads Kenosha County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Kenosha | 99,239 | −0.7% | 58.9% |
| Pleasant Prairie | 21,798 | +2.5% | 12.9% |
| Salem Lakes | 14,271 | −2.2% | 8.5% |
| Somers | 8,171 | −3.4% | 4.9% |
| Twin Lakes | 6,338 | +0.1% | 3.8% |
| Bristol | 5,300 | +2.0% | 3.1% |
| Paddock Lake | 2,974 | +1.5% | 1.8% |
| Genoa Cityextends beyond Kenosha County | 2,866 | −3.0% | Counted whole |
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 Kenosha County is counted whole, so it has no share.
Kenosha County, Homes
Homes in Kenosha County
Of Kenosha County's 72,897 homes, 66% are detached houses, against 66% across Wisconsin; 18% are in buildings of five or more homes. Half of its homes were built before 1975, close to Wisconsin's 1975: 35% date from before 1960 and 20% from 2000 or later. 68% 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 | Kenosha County | Wisconsin |
|---|---|---|
| Housing units | 72,897 | 2,750,750 |
| Detached houses | 66% | 66% |
| In buildings of 5 or more | 18% | 17% |
| Mobile homes | 3% | 3% |
| Built before 1960 | 35% | 34% |
| Built since 2000 | 20% | 20% |
| Middle year built | 1975 | 1975 |
| Owner-occupied | 68% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.