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
Locations and reports
Radon Levels in Dodge County, Wisconsin
EPA puts Dodge County in Zone 1, its highest radon zone, and high results are common there: 54.9% of the 257 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
54.9%
19.2 pts above WI
- Dodge
- 54.9%
- Wisconsin
- 35.7%
257 tests, 2023
Median result
4.8pCi/L
Action level reached
- Dodge
- 4.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
257
23rd of 69 by tests
- Dodge
- 257
- 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
4 of 69
Top quarter
- Dodge
- 54.9%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Dodge County
Starts at Dodge County's median, 4.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.8 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. Dodge County's median reported result, 2023.
The data
Dodge County, At a glance
Dodge County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Dodge 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 Dodge County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 63.0% |
| 2015 | 56.6% |
| 2016 | 61.1% |
| 2017 | 58.5% |
| 2019 | 61.5% |
| 2020 | 53.8% |
| 2021 | 39.6% |
| 2022 | 50.6% |
| 2023 | 54.9% |
2023: 54.9%. Across these years the share ran from 39.6% to 63.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 257 tests reported to CDC for Dodge 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).
Dodge County, Compared
Dodge County radon figures, compared
Calculated by Radon411More than half: 54.9% of the 257 radon tests reported to CDC for Dodge County in 2023 read at least 4 pCi/L. That places it 4th of 69 Wisconsin counties with 30 or more tests for the same period. That is 19.2 points above the 35.7% pooled from 72 Wisconsin counties.
The median result, 4.8 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 43.8 pCi/L. The rest split 24.9% under 2 pCi/L and 20.2% from 2 to 4 (Wisconsin: 41.4% and 23.0%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 54.9% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Washington County at 47.9%, 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 2016, with 321 tests reported; the quietest, 2020, had 117.
Over 9 years of annual figures the share fell 8.1 points, from 63.0% in 2014 to 54.9% in 2023; its peak was 63.0% in 2014. Nationally, every county with a figure for the same period pools to 33.4%; Dodge County sits 21.5 points above it. CDC also counts 26 tests taken after mitigation in Dodge County for the same period: tests in homes where a fix was already in.
Dodge CountyWisconsin, pooled
54.9% % of tests35.7% % of tests
| Year | Tests | Dodge County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 257 | 63.0% | 51.1% |
| 2015 | 244 | 56.6% | 51.6% |
| 2016 | 321 | 61.1% | 45.2% |
| 2017 | 311 | 58.5% | 44.8% |
| 2019 | 218 | 61.5% | 42.9% |
| 2020 | 117 | 53.8% | 27.0% |
| 2021 | 149 | 39.6% | 39.9% |
| 2022 | 178 | 50.6% | 42.9% |
| 2023 | 257 | 54.9% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Dodge County, Geology
The ground under Dodge County
PredictedUSGS's geologic map puts all of Dodge County's mapped land in one class: high radon potential. All of it lies in the area the map calls Eastern Ridges and Lowlands, 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 |
|---|---|---|---|---|
| Eastern Ridges and Lowlands | Glacial deposits derived from Ordovician carbonate rocks. | High | 12 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Dodge County beside the ground around it
Dodge County has more high-potential ground than Wisconsin as a whole: 100% of its land against 34.8%. Of the 7 counties that border it, none has as large a share of high-potential ground; Jefferson County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Dodge County, Local resources
Radon testing and mitigation in Dodge 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
Dodge County, Questions
Questions about radon in Dodge County
Are radon levels high in Dodge County?
In 2023, 54.9% of the radon tests reported to CDC for Dodge County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.8 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 3 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Dodge County?
Dodge County borders 7 counties: Fond du Lac County, Jefferson County, Washington County, Green Lake County, Columbia County, Waukesha County and Dane County.
Products
Dodge County, Products
Testing a home in Dodge County
In Dodge County, 54.9% of 257 tests reported to CDC in 2023 reached 4 pCi/L, against 35.7% pooled across Wisconsin. In Zone 1 the year-round level in Dodge 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
Hello Radon C battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Dodge County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Dodge County
Explore
Dodge County, Bordering counties
Counties bordering Dodge County
Calculated by Radon411- Radon levels in Washington CountyEPA zone 1
47.9%at or above 4 pCi/L
Median 3.8 pCi/L · 399 tests · 7.0 points below Dodge County
- Radon levels in Jefferson CountyEPA zone 1
44.3%at or above 4 pCi/L
Median 3.5 pCi/L · 296 tests · 10.6 points below Dodge County
- Radon levels in Waukesha CountyEPA zone 1
43.2%at or above 4 pCi/L
Median 3.2 pCi/L · 1,633 tests · 11.7 points below Dodge County
- Radon levels in Green Lake CountyEPA zone 1
40.5%at or above 4 pCi/L
Median 3.4 pCi/L · 79 tests · 14.4 points below Dodge County
- Radon levels in Dane CountyEPA zone 1
34.9%at or above 4 pCi/L
Median 2.5 pCi/L · 2,887 tests · 20.0 points below Dodge County
- Radon levels in Columbia CountyEPA zone 2
28.8%at or above 4 pCi/L
Median 2.0 pCi/L · 163 tests · 26.1 points below Dodge 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 · 35.3 points below Dodge County
Dodge County, Cities and towns
Cities and towns in Dodge County
Dodge County's population has barely moved since 2020: 89,097 residents on July 1, 2025 against 89,343 then, by the Census Bureau's estimates. That works out to 102 people per square mile of land. Watertown, the largest place on its list (22,704 residents in all), extends beyond Dodge County, so no share of the total is worked out for it. CDC's 257 reported tests for 2023 work out to 2.9 per 1,000 residents (2025 estimate), close to Wisconsin's 3.5.
From Watertown to Lowell, CDC publishes no figure by town: each reads Dodge County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Watertownextends beyond Dodge County | 22,704 | −1.2% | Counted whole |
| Beaver Dam | 16,542 | −1.1% | 18.6% |
| Hartfordextends beyond Dodge County | 16,005 | +2.2% | Counted whole |
| Waupunextends beyond Dodge County | 11,150 | −3.7% | Counted whole |
| Columbusextends beyond Dodge County | 5,400 | −2.4% | Counted whole |
| Mayville | 5,184 | +0.4% | 5.8% |
| Horicon | 3,917 | +3.6% | 4.4% |
| Juneau | 2,706 | +2.0% | 3.0% |
| Lomira | 2,686 | +0.4% | 3.0% |
| Randolphextends beyond Dodge County | 1,771 | −1.3% | Counted whole |
| Fox Lake | 1,686 | +5.2% | 1.9% |
| Theresa | 1,346 | +7.5% | 1.5% |
- Hustisford
- Iron Ridge
- Kekoskee
- Reeseville
- Brownsville
- Neosho
- Clyman
- Lowell
20 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Dodge County is counted whole, so it has no share.
Dodge County, Homes
Homes in Dodge County
Of Dodge County's 38,290 homes, 71% are detached houses, against 66% across Wisconsin; 14% are in buildings of five or more homes. Half of its homes were built before 1970, close to Wisconsin's 1975: 42% date from before 1960 and 18% from 2000 or later. 71% 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 | Dodge County | Wisconsin |
|---|---|---|
| Housing units | 38,290 | 2,750,750 |
| Detached houses | 71% | 66% |
| In buildings of 5 or more | 14% | 17% |
| Mobile homes | 4% | 3% |
| Built before 1960 | 42% | 34% |
| Built since 2000 | 18% | 20% |
| Middle year built | 1970 | 1975 |
| Owner-occupied | 71% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.