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 Calumet County, Wisconsin
EPA puts Calumet County in Zone 2, its middle radon zone, and high results are common there: 51.6% of the 122 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
51.6%
15.9 pts above WI
- Calumet
- 51.6%
- Wisconsin
- 35.7%
122 tests, 2023
Median result
4.4pCi/L
Action level reached
- Calumet
- 4.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
122
41st of 69 by tests
- Calumet
- 122
- 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
11 of 69
Top quarter
- Calumet
- 51.6%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Calumet County
Starts at Calumet 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. Calumet County's median reported result, 2023.
The data
Calumet County, At a glance
Calumet County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Calumet County is a
USGS geologic potential: Moderate across 72% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Calumet County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 52.0% |
| 2015 | 54.5% |
| 2016 | 48.8% |
| 2017 | 42.9% |
| 2019 | 57.1% |
| 2020 | 58.0% |
| 2021 | 35.8% |
| 2022 | 47.7% |
| 2023 | 51.6% |
2023: 51.6%. Across these years the share ran from 35.8% to 58.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 122 tests reported to CDC for Calumet 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).
Calumet County, Compared
Calumet County radon figures, compared
Calculated by Radon411More than half: 51.6% of the 122 radon tests reported to CDC for Calumet County in 2023 read at least 4 pCi/L. That places it 11th of 69 Wisconsin counties with 30 or more tests for the same period. That is 15.9 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 35.1 pCi/L. The rest split 27.0% under 2 pCi/L and 21.3% from 2 to 4 (Wisconsin: 41.4% and 23.0%). The reported tests do not follow EPA's Zone 2 label for Calumet County (predicted average between 2 and 4 pCi/L): 51.6% of them reached 4 pCi/L, fewer than that label suggests.
No bordering county with a figure for the same period reported a higher share; the closest is Sheboygan County at 42.9%, the lowest Fond du Lac County at 19.6%. 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 2021, with 134 tests reported; the quietest, 2022, had 44.
Over 9 years of annual figures the share held within 2 points, from 52.0% in 2014 to 51.6% in 2023; its peak was 58.0% in 2020. Nationally, every county with a figure for the same period pools to 33.4%; Calumet County sits 18.2 points above it.
Calumet CountyWisconsin, pooled
51.6% % of tests35.7% % of tests
| Year | Tests | Calumet County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 98 | 52.0% | 51.1% |
| 2015 | 132 | 54.5% | 51.6% |
| 2016 | 127 | 48.8% | 45.2% |
| 2017 | 105 | 42.9% | 44.8% |
| 2019 | 70 | 57.1% | 42.9% |
| 2020 | 69 | 58.0% | 27.0% |
| 2021 | 134 | 35.8% | 39.9% |
| 2022 | 44 | 47.7% | 42.9% |
| 2023 | 122 | 51.6% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Calumet County, Geology
The ground under Calumet County
PredictedUSGS's geologic map splits Calumet County: 72.2% of its land is moderate radon potential and 27.8% high. The map puts 72.2% of Calumet County in the area it calls Green Bay Lobe and 27.8% in Eastern Ridges and Lowlands. 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 |
|---|---|---|---|---|
| Green Bay Lobe | Glacial deposits derived from carbonate and igneous rocks. | Moderate | 10 | 72.2% |
| Eastern Ridges and Lowlands | Glacial deposits derived from Ordovician carbonate rocks. | High | 12 | 27.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Calumet County beside the ground around it
On high-potential ground Calumet County is close to Wisconsin as a whole: 27.8% of its land against 34.8%. Of the 6 counties that border it, 2 have more high-potential ground, Fond du Lac County the most at 89.4%.
The map rates the ground, not the air in any home.
Local help
Calumet County, Local resources
Radon testing and mitigation in Calumet 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
Calumet County, Questions
Questions about radon in Calumet County
Are radon levels high in Calumet County?
In 2023, 51.6% of the radon tests reported to CDC for Calumet 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, 10 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Calumet County?
Calumet County borders 6 counties: Manitowoc County, Winnebago County, Outagamie County, Brown County, Fond du Lac County and Sheboygan County.
Products
Calumet County, Products
Testing a home in Calumet County
In Calumet County, 51.6% of 122 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 Calumet 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
MonitorAEGTEST
HOUND-3699 radon monitor with a 2.1-inch touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
First reading: Within 1 hour
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Calumet County, Bordering counties
Counties bordering Calumet County
Calculated by Radon411- Radon levels in Sheboygan CountyEPA zone 2
42.9%at or above 4 pCi/L
Median 3.3 pCi/L · 399 tests · 8.7 points below Calumet County
- Radon levels in Winnebago CountyEPA zone 2
42.4%at or above 4 pCi/L
Median 3.1 pCi/L · 512 tests · 9.2 points below Calumet County
- Radon levels in Outagamie CountyEPA zone 2
40.7%at or above 4 pCi/L
Median 3.1 pCi/L · 337 tests · 10.9 points below Calumet County
- Radon levels in Manitowoc CountyEPA zone 2
31.1%at or above 4 pCi/L
Median 2.2 pCi/L · 209 tests · 20.5 points below Calumet County
- Radon levels in Brown CountyEPA zone 2
23.0%at or above 4 pCi/L
Median 1.4 pCi/L · 551 tests · 28.6 points below Calumet County
- Radon levels in Fond du Lac CountyEPA zone 1
19.6%at or above 4 pCi/L
Median 1.4 pCi/L · 984 tests · 32.0 points below Calumet County
Calumet County, Cities and towns
Cities and towns in Calumet County
The Census Bureau estimates 53,982 residents in Calumet County for July 1, 2025, 1,507 more than in 2020 (+2.9%). That works out to 170 people per square mile of land. Appleton, the largest place on its list (75,452 residents in all), extends beyond Calumet County, so no share of the total is worked out for it. Reported testing is thin here: 122 tests over 2023, or 2.3 for every 1,000 residents (2025 estimate), where Wisconsin as a whole comes to 3.5.
From Appleton to Potter, CDC publishes no figure by town: each reads Calumet County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Appletonextends beyond Calumet County | 75,452 | −0.2% | Counted whole |
| Kaukaunaextends beyond Calumet County | 18,517 | +8.1% | Counted whole |
| Menashaextends beyond Calumet County | 18,385 | +0.6% | Counted whole |
| Harrison | 14,492 | +15.1% | 26.8% |
| Chilton | 4,183 | +3.0% | 7.7% |
| Kielextends beyond Calumet County | 3,973 | +0.9% | Counted whole |
| Brillion | 3,327 | +1.6% | 6.2% |
| Sherwood | 3,311 | +1.5% | 6.1% |
| New Holstein | 3,040 | −4.2% | 5.6% |
| Hilbert | 1,237 | −0.6% | 2.3% |
| Stockbridge | 654 | −4.0% | 1.2% |
| Potter | 232 | −4.5% | 0.4% |
Places in Calumet County with a city page: 1 of 1
12 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 Calumet County is counted whole, so it has no share.
Calumet County, Homes
Homes in Calumet County
Calumet County is a place of houses on their own lots: 78% of its 22,163 homes are detached single-family houses, against 66% across Wisconsin. Much of Calumet County is recent building: 30% of its homes have gone up since 2000 and the middle year built is 1986, against 1975 for Wisconsin. Owners live in 81% of the occupied homes (Wisconsin: 68%), so for most households a test and a fix are their own to order.
| Homes | Calumet County | Wisconsin |
|---|---|---|
| Housing units | 22,163 | 2,750,750 |
| Detached houses | 78% | 66% |
| In buildings of 5 or more | 11% | 17% |
| Mobile homes | 2% | 3% |
| Built before 1960 | 24% | 34% |
| Built since 2000 | 30% | 20% |
| Middle year built | 1986 | 1975 |
| Owner-occupied | 81% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.