Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in La Crosse County, Wisconsin
EPA puts La Crosse County in Zone 2, its middle radon zone, and 31.4% of its 771 reported radon tests (2023) were 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
31.4%
4.3 pts below WI
- La Crosse
- 31.4%
- Wisconsin
- 35.7%
771 tests, 2023
Median result
2.7pCi/L
Below action level
- La Crosse
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
771
5th of 69 by tests
- La Crosse
- 771
- 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
48 of 69
Middle half
- La Crosse
- 31.4%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for La Crosse County
Starts at La Crosse 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. La Crosse County's median reported result, 2023.
The data
La Crosse County, At a glance
La Crosse County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
La Crosse 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 La Crosse County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 33.8% |
| 2015 | 36.9% |
| 2016 | 37.2% |
| 2017 | 33.2% |
| 2019 | 34.3% |
| 2020 | 33.6% |
| 2021 | 34.0% |
| 2022 | 42.0% |
| 2023 | 31.4% |
2023: 31.4%. Across these years the share ran from 31.4% to 42.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 771 tests reported to CDC for La Crosse 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).
La Crosse County, Compared
La Crosse County radon figures, compared
Calculated by Radon411In La Crosse County, about 3 in 10 reported tests in 2023 (242 of 771) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 2.0 points lower. Across 72 Wisconsin counties pooled together, 35.7% of tests reached that level, so La Crosse County runs 4.3 points below its state.
Of 6 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 22.5% (Monroe County) to 47.8% (Houston County, MN). By share, La Crosse County is 48th of 69 Wisconsin counties with 30 or more tests for the same period.
Year by year, 2014 opened at 33.8% and 2023 closed at 31.4% (down 2.4 points), with 2022 the high at 42.0%. Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 35.7 pCi/L. Below the action level, 272 tests (35.3%) came in under 2 pCi/L, against 41.4% statewide, and 257 tests (33.3%) 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 31.4% share point the same way here. USGS geology rates 66% of the county's land moderate radon potential. CDC also counts 49 tests taken after mitigation in La Crosse County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2023, with 771 tests reported; the quietest, 2021, had 388.
La Crosse CountyWisconsin, pooled
| Year | Tests | La Crosse County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 473 | 33.8% | 51.1% |
| 2015 | 545 | 36.9% | 51.6% |
| 2016 | 537 | 37.2% | 45.2% |
| 2017 | 413 | 33.2% | 44.8% |
| 2019 | 699 | 34.3% | 42.9% |
| 2020 | 473 | 33.6% | 27.0% |
| 2021 | 388 | 34.0% | 39.9% |
| 2022 | 402 | 42.0% | 42.9% |
| 2023 | 771 | 31.4% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
La Crosse County, Geology
The ground under La Crosse County
PredictedUSGS's geologic map splits La Crosse County: 66.4% of its land is moderate radon potential and 33.6% high. The map puts 66.4% of La Crosse County in the area it calls Driftless Area and 33.3% in Driftless Area. 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 | 66.4% |
| Driftless Area | Cambrian sandstone and Ordovician limestone and dolostone. | High | 12 | 33.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
La Crosse County beside the ground around it
On high-potential ground La Crosse County is close to Wisconsin as a whole: 33.6% of its land against 34.8%. Of the 6 counties that border it, 4 have more high-potential ground, Houston County, MN the most at 100%.
The map rates the ground, not the air in any home.
Local help
La Crosse County, Local resources
Radon testing and mitigation in La Crosse County
Listed radon businesses with an address in La Crosse 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: Onalaska
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
La Crosse County, Questions
Questions about radon in La Crosse County
Are radon levels high in La Crosse County?
In 2023, 31.4% of the radon tests reported to CDC for La Crosse 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, 47 reported a higher share; pooled, the state comes to 35.7%.
Which counties border La Crosse County?
La Crosse County borders 6 counties: Monroe County, WI, Houston County, MN, Vernon County, WI, Winona County, MN, Jackson County, WI and Trempealeau County, WI.
Products
La Crosse County, Products
Testing a home in La Crosse County
In La Crosse County, 31.4% of 771 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 La Crosse 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
RM-65 rechargeable radon detector with a color screen and alarm
- 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
La Crosse County, Bordering counties
Counties bordering La Crosse County
Calculated by Radon411- Radon levels in Houston County, MNEPA zone 1
47.8%at or above 4 pCi/L
Median 3.5 pCi/L · 113 tests · 16.4 points above La Crosse County
- Radon levels in Vernon County, WIEPA zone 1
47.5%at or above 4 pCi/L
Median 3.8 pCi/L · 162 tests · 16.1 points above La Crosse County
- Radon levels in Trempealeau County, WIEPA zone 2
42.0%at or above 4 pCi/L
Median 3.3 pCi/L · 112 tests · 10.6 points above La Crosse County
- Radon levels in Winona County, MNEPA zone 1
38.8%at or above 4 pCi/L
Median 3.0 pCi/L · 139 tests · 7.4 points above La Crosse County
- Radon levels in Jackson County, WIEPA zone 2
38.7%at or above 4 pCi/L
Median 3.2 pCi/L · 93 tests · 7.3 points above La Crosse County
- Radon levels in Monroe County, WIEPA zone 2
22.5%at or above 4 pCi/L
Median 2.2 pCi/L · 213 tests · 8.9 points below La Crosse County
La Crosse County, Cities and towns
Cities and towns in La Crosse County
La Crosse County's population has barely moved since 2020: 121,339 residents on July 1, 2025 against 120,955 then, by the Census Bureau's estimates. That works out to 269 people per square mile of land. Its largest town, La Crosse, has 50,784 residents, 41.9% of the total. Testing is reported here more often than across the state: CDC's 771 reported tests for 2023 come to 6.4 for every 1,000 residents (2025 estimate), against 3.5 for Wisconsin.
From La Crosse to Rockland, CDC publishes no figure by town: each reads La Crosse County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| La Crosse | 50,784 | −3.6% | 41.9% |
| Onalaska | 20,297 | +7.6% | 16.7% |
| Holmen | 12,105 | +12.5% | 10.0% |
| West Salem | 5,288 | −0.8% | 4.4% |
| Bangor | 1,564 | +8.2% | 1.3% |
| Rocklandextends beyond La Crosse County | 754 | −2.0% | Counted whole |
6 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 La Crosse County is counted whole, so it has no share.
La Crosse County, Homes
Homes in La Crosse County
Of La Crosse County's 53,234 homes, 60% are detached houses, against 66% across Wisconsin; 20% are in buildings of five or more homes. Half of its homes were built before 1978, close to Wisconsin's 1975: 30% date from before 1960 and 22% from 2000 or later. 62% 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 | La Crosse County | Wisconsin |
|---|---|---|
| Housing units | 53,234 | 2,750,750 |
| Detached houses | 60% | 66% |
| In buildings of 5 or more | 20% | 17% |
| Mobile homes | 4% | 3% |
| Built before 1960 | 30% | 34% |
| Built since 2000 | 22% | 20% |
| Middle year built | 1978 | 1975 |
| Owner-occupied | 62% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.