Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Trempealeau County, Wisconsin
EPA puts Trempealeau County in Zone 2, its middle radon zone, and high results are common there: 42.0% of the 112 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
42.0%
6.3 pts above WI
- Trempealeau
- 42.0%
- Wisconsin
- 35.7%
112 tests, 2023
Median result
3.3pCi/L
Below action level
- Trempealeau
- 3.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
112
44th of 69 by tests
- Trempealeau
- 112
- 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
27 of 69
Middle half
- Trempealeau
- 42.0%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Trempealeau County
Starts at Trempealeau County's median, 3.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.3 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. Trempealeau County's median reported result, 2023.
The data
Trempealeau County, At a glance
Trempealeau County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Trempealeau County is a
USGS geologic potential: Moderate across 66% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Trempealeau County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 68.4% |
| 2015 | 50.0% |
| 2016 | 54.5% |
| 2017 | 40.0% |
| 2019 | 41.1% |
| 2020 | 33.7% |
| 2021 | 40.8% |
| 2022 | 51.1% |
| 2023 | 42.0% |
2023: 42.0%. Across these years the share ran from 33.7% to 68.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 112 tests reported to CDC for Trempealeau 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).
Trempealeau County, Compared
Trempealeau County radon figures, compared
Calculated by Radon411In Trempealeau County, about 4 in 10 reported tests in 2023 (47 of 112) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 8.6 points higher. Across 72 Wisconsin counties pooled together, 35.7% of tests reached that level, so Trempealeau County runs 6.3 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 31.4% (La Crosse County) to 53.6% (Buffalo County). By share, Trempealeau County is 27th of 69 Wisconsin counties with 30 or more tests for the same period.
Year by year, 2014 opened at 68.4% and 2023 closed at 42.0% (down 26.4 points), with 2014 the high at 68.4%. Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 18.4 pCi/L. Below the action level, 36 tests (32.1%) came in under 2 pCi/L, against 41.4% statewide, and 29 tests (25.9%) 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 42.0% share point the same way here. USGS geology rates 66% of the county's land moderate radon potential. CDC also counts 19 tests taken after mitigation in Trempealeau County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2019, with 124 tests reported; the quietest, 2014, had 38.
Trempealeau CountyWisconsin, pooled
| Year | Tests | Trempealeau County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 38 | 68.4% | 51.1% |
| 2015 | 52 | 50.0% | 51.6% |
| 2016 | 77 | 54.5% | 45.2% |
| 2017 | 70 | 40.0% | 44.8% |
| 2019 | 124 | 41.1% | 42.9% |
| 2020 | 98 | 33.7% | 27.0% |
| 2021 | 76 | 40.8% | 39.9% |
| 2022 | 88 | 51.1% | 42.9% |
| 2023 | 112 | 42.0% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Trempealeau County, Geology
The ground under Trempealeau County
PredictedUSGS's geologic map splits Trempealeau County: 65.7% of its land is moderate radon potential and 34.3% high. The map puts 63.7% of Trempealeau County in the area it calls Driftless Area and 34.2% in Driftless Area, with one smaller area 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 |
|---|---|---|---|---|
| Driftless Area | Cambrian sandstone. | Moderate | 10 | 63.7% |
| Driftless Area | Ordovician carbonate rocks. | High | 12 | 34.2% |
| Central Plain/Northern Highland | Pre-Late Wisconsinan glacial deposits derived from sandstone and carbonate rocks. | Moderate | 10 | 1.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Trempealeau County beside the ground around it
On high-potential ground Trempealeau County is close to Wisconsin as a whole: 34.3% of its land against 34.8%. Of the 5 counties that border it, 2 have more high-potential ground, Winona County, MN the most at 100%.
The map rates the ground, not the air in any home.
Local help
Trempealeau County, Local resources
Radon testing and mitigation in Trempealeau 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
Trempealeau County, Questions
Questions about radon in Trempealeau County
Are radon levels high in Trempealeau County?
In 2023, 42.0% of the radon tests reported to CDC for Trempealeau County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 26 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Trempealeau County?
Trempealeau County borders 5 counties: Buffalo County, WI, Eau Claire County, WI, Jackson County, WI, Winona County, MN and La Crosse County, WI.
Products
Trempealeau County, Products
Testing a home in Trempealeau County
In Trempealeau County, 42.0% of 112 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 Trempealeau 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
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Trempealeau County, Bordering counties
Counties bordering Trempealeau County
Calculated by Radon411- Radon levels in Buffalo County, WIEPA zone 1
53.6%at or above 4 pCi/L
Median 4.4 pCi/L · 56 tests · 11.6 points above Trempealeau County
- Radon levels in Winona County, MNEPA zone 1
38.8%at or above 4 pCi/L
Median 3.0 pCi/L · 139 tests · 3.2 points below Trempealeau County
- Radon levels in Jackson County, WIEPA zone 2
38.7%at or above 4 pCi/L
Median 3.2 pCi/L · 93 tests · 3.3 points below Trempealeau County
- Radon levels in Eau Claire County, WIEPA zone 2
32.7%at or above 4 pCi/L
Median 2.8 pCi/L · 474 tests · 9.3 points below Trempealeau County
- Radon levels in La Crosse County, WIEPA zone 2
31.4%at or above 4 pCi/L
Median 2.7 pCi/L · 771 tests · 10.6 points below Trempealeau County
Trempealeau County, Cities and towns
Cities and towns in Trempealeau County
The Census Bureau estimates 31,171 residents in Trempealeau County for July 1, 2025, 346 more than in 2020 (+1.1%). That works out to 43 people per square mile of land. No town dominates: Arcadia, the largest, has 3,840 residents, 12.3% of the total. Together its 11 incorporated places hold 52.4% of those residents; the other 47.6% live outside any of them. CDC's 112 reported tests for 2023 work out to 3.6 per 1,000 residents (2025 estimate), close to Wisconsin's 3.5.
From Arcadia to Pigeon Falls, CDC publishes no figure by town: each reads Trempealeau County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Arcadia | 3,840 | +2.8% | 12.3% |
| Trempealeau | 1,889 | +1.7% | 6.1% |
| Osseo | 1,842 | +2.0% | 5.9% |
| Galesville | 1,704 | +2.4% | 5.5% |
| Whitehall | 1,621 | −1.9% | 5.2% |
| Independence | 1,487 | −0.5% | 4.8% |
| Blair | 1,292 | −2.3% | 4.1% |
| Strum | 1,075 | Level | 3.4% |
| Eleva | 688 | Level | 2.2% |
| Ettrick | 518 | −1.3% | 1.7% |
| Pigeon Falls | 392 | −0.8% | 1.3% |
11 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).
Trempealeau County, Homes
Homes in Trempealeau County
Of Trempealeau County's 13,373 homes, 74% are detached houses, against 66% across Wisconsin; 9% are in buildings of five or more homes. Half of its homes were built before 1976, close to Wisconsin's 1975: 33% date from before 1960 and 21% from 2000 or later. 74% 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 | Trempealeau County | Wisconsin |
|---|---|---|
| Housing units | 13,373 | 2,750,750 |
| Detached houses | 74% | 66% |
| In buildings of 5 or more | 9% | 17% |
| Mobile homes | 6% | 3% |
| Built before 1960 | 33% | 34% |
| Built since 2000 | 21% | 20% |
| Middle year built | 1976 | 1975 |
| Owner-occupied | 74% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.