Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Crawford County, Wisconsin
EPA puts Crawford County in Zone 1, its highest radon zone, and high results are common there: 53.9% of the 217 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
53.9%
18.2 pts above WI
- Crawford
- 53.9%
- Wisconsin
- 35.7%
217 tests, 2023
Median result
4.4pCi/L
Action level reached
- Crawford
- 4.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
217
27th of 69 by tests
- Crawford
- 217
- Dane
- 2,887
Reported to CDC before any fix, 2023
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Wisconsin
5 of 69
Top quarter
- Crawford
- 53.9%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Crawford County
Starts at Crawford County's median, 4.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.4 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Crawford County's median reported result, 2023.
The data
Crawford County, At a glance
Crawford County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Crawford County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Crawford County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 30.4% |
| 2015 | 60.8% |
| 2016 | 61.1% |
| 2017 | 36.1% |
| 2019 | 52.1% |
| 2020 | 52.2% |
| 2021 | 54.7% |
| 2022 | 63.7% |
| 2023 | 53.9% |
2023: 53.9%. Across these years the share ran from 30.4% to 63.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 217 tests reported to CDC for Crawford 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).
Crawford County, Compared
Crawford County radon figures, compared
Calculated by Radon411More than half: 53.9% of the 217 radon tests reported to CDC for Crawford County in 2023 read at least 4 pCi/L. That places it 5th of 69 Wisconsin counties with 30 or more tests for the same period. That is 18.2 points above the 35.7% pooled from 72 Wisconsin counties.
The median result, 4.4 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 50.6 pCi/L. The rest split 24.4% under 2 pCi/L and 21.7% from 2 to 4 (Wisconsin: 41.4% and 23.0%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 53.9% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Grant County at 48.3%, the lowest Richland County at 33.3%. Statewide for the same period, Langlade County reported the highest share (65.8%) and Bayfield County the lowest (5.7%).
The busiest year on file was 2023, with 217 tests reported; the quietest, 2014, had 23.
Over 8 years of annual figures the share fell 6.9 points, from 60.8% in 2015 to 53.9% in 2023; its peak was 63.7% in 2022. Nationally, every county with a figure for the same period pools to 33.4%; Crawford County sits 20.5 points above it. CDC also counts 13 tests taken after mitigation in Crawford County for the same period: tests in homes where a fix was already in.
Crawford CountyWisconsin, pooled
53.9% % of tests35.7% % of tests
| Year | Tests | Crawford County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2015 | 51 | 60.8% | 51.6% |
| 2016 | 72 | 61.1% | 45.2% |
| 2017 | 83 | 36.1% | 44.8% |
| 2019 | 163 | 52.1% | 42.9% |
| 2020 | 90 | 52.2% | 27.0% |
| 2021 | 64 | 54.7% | 39.9% |
| 2022 | 160 | 63.7% | 42.9% |
| 2023 | 217 | 53.9% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Crawford County, Geology
The ground under Crawford County
PredictedUSGS's geologic map puts all of Crawford County's mapped land in one class: high radon potential. All of it lies in the area the map calls Driftless Area, to which USGS gives a radon index of 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 and Ordovician limestone and dolostone. | High | 12 | 99.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Crawford County beside the ground around it
Crawford County has more high-potential ground than Wisconsin as a whole: 100% of its land against 34.8%. Of the 5 counties that border it, none has as large a share of high-potential ground; Grant County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Crawford County, Local resources
Radon testing and mitigation in Crawford 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
Crawford County, Questions
Questions about radon in Crawford County
Are radon levels high in Crawford County?
In 2023, 53.9% of the radon tests reported to CDC for Crawford County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.4 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 4 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Crawford County?
Crawford County borders 5 counties: Richland County, WI, Allamakee County, IA, Vernon County, WI, Grant County, WI and Clayton County, IA.
Products
Crawford County, Products
Testing a home in Crawford County
In Crawford County, 53.9% of 217 tests reported to CDC in 2023 reached 4 pCi/L, against 35.7% pooled across Wisconsin. In Zone 1 the year-round level in Crawford County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
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
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Crawford County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Crawford County
Explore
Crawford County, Bordering counties
Counties bordering Crawford County
Calculated by Radon411- Radon levels in Grant County, WIEPA zone 1
48.3%at or above 4 pCi/L
Median 3.5 pCi/L · 323 tests · 5.6 points below Crawford County
- Radon levels in Vernon County, WIEPA zone 1
47.5%at or above 4 pCi/L
Median 3.8 pCi/L · 162 tests · 6.4 points below Crawford County
- Radon levels in Richland County, WIEPA zone 1
33.3%at or above 4 pCi/L
Median 2.9 pCi/L · 48 tests · 20.6 points below Crawford County
- Radon levels in Allamakee County, IAEPA zone 1
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in Clayton County, IAEPA zone 1
No CDC figure for 2023; its page reads it against its own neighbours.
Crawford County, Cities and towns
Cities and towns in Crawford County
About 15,910 people live in Crawford County by the Census Bureau's estimate for July 1, 2025, 172 fewer than in 2020 (−1.1%). That works out to 28 people per square mile of land. Its largest town, Prairie du Chien, has 5,408 residents, 34.0% of the total. Testing is reported here more often than across the state: CDC's 217 reported tests for 2023 come to 13.6 for every 1,000 residents (2025 estimate), against 3.5 for Wisconsin.
From Prairie du Chien to Bell Center, CDC publishes no figure by town: each reads Crawford County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Prairie du Chien | 5,408 | −2.0% | 34.0% |
| Wauzeka | 618 | −1.4% | 3.9% |
| Soldiers Grove | 549 | −2.3% | 3.5% |
| Gays Mills | 498 | −2.7% | 3.1% |
| Eastman | 333 | −4.3% | 2.1% |
| De Sotoextends beyond Crawford County | 323 | +5.6% | Counted whole |
| Ferryville | 191 | −2.1% | 1.2% |
| Mount Sterling | 182 | −2.7% | 1.1% |
| Lynxville | 134 | −2.9% | 0.8% |
| Steuben | 115 | −5.7% | 0.7% |
| Bell Center | 106 | −2.8% | 0.7% |
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). A place that extends beyond Crawford County is counted whole, so it has no share.
Crawford County, Homes
Homes in Crawford County
Crawford County is a place of houses on their own lots: 76% of its 8,705 homes are detached single-family houses, against 66% across Wisconsin. Half of its homes were built before 1977, close to Wisconsin's 1975: 33% date from before 1960 and 19% from 2000 or later. Owners live in 76% of the occupied homes (Wisconsin: 68%), so for most households a test and a fix are their own to order.
| Homes | Crawford County | Wisconsin |
|---|---|---|
| Housing units | 8,705 | 2,750,750 |
| Detached houses | 76% | 66% |
| In buildings of 5 or more | 4% | 17% |
| Mobile homes | 14% | 3% |
| Built before 1960 | 33% | 34% |
| Built since 2000 | 19% | 20% |
| Middle year built | 1977 | 1975 |
| Owner-occupied | 76% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.