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 Lincoln County, Wisconsin
EPA puts Lincoln County in Zone 2, its middle radon zone, and 23.5% of its 81 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
23.5%
12.2 pts below WI
- Lincoln
- 23.5%
- Wisconsin
- 35.7%
81 tests, 2023
Median result
2.1pCi/L
Below action level
- Lincoln
- 2.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
81
47th of 69 by tests
- Lincoln
- 81
- 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
55 of 69
Lowest quarter
- Lincoln
- 23.5%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Lincoln County
Starts at Lincoln County's median, 2.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.1 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. Lincoln County's median reported result, 2023.
The data
Lincoln County, At a glance
Lincoln County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Lincoln County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Lincoln County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 44.1% |
| 2015 | 54.5% |
| 2016 | 36.7% |
| 2017 | 43.3% |
| 2019 | 53.1% |
| 2020 | 47.7% |
| 2021 | 50.0% |
| 2022 | 17.3% |
| 2023 | 23.5% |
2023: 23.5%. Across these years the share ran from 17.3% to 54.5%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 81 tests reported to CDC for Lincoln 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).
Lincoln County, Compared
Lincoln County radon figures, compared
Calculated by Radon411Lincoln County's 81 reported tests in 2023 had a middle value of 2.1 pCi/L and a maximum of 132.4 pCi/L, and 23.5% reached 4 pCi/L. Wisconsin as a whole (72 Wisconsin counties, pooled) comes to 35.7%: 12.2 points higher than here.
Among its state's counties it ranks 55th of 69 Wisconsin counties with 30 or more tests for the same period. Statewide for the same period, Langlade County reported the highest share (65.8%) and Bayfield County the lowest (5.7%).
Below the action level, 37 tests (45.7%) came in under 2 pCi/L, against 41.4% statewide, and 25 tests (30.9%) fell between 2 and 4, against 23.0% statewide. The busiest year on file was 2015, with 121 tests reported; the quietest, 2019, had 49.
EPA's 1993 zone map puts Lincoln County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 18.9% in Taylor County to 65.8% in Langlade County, with Taylor County below Lincoln County. Over 9 years of annual figures the share fell 20.6 points, from 44.1% in 2014 to 23.5% in 2023; its peak was 54.5% in 2015.
Lincoln CountyWisconsin, pooled
23.5% % of tests35.7% % of tests
| Year | Tests | Lincoln County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 68 | 44.1% | 51.1% |
| 2015 | 121 | 54.5% | 51.6% |
| 2016 | 90 | 36.7% | 45.2% |
| 2017 | 67 | 43.3% | 44.8% |
| 2019 | 49 | 53.1% | 42.9% |
| 2020 | 65 | 47.7% | 27.0% |
| 2021 | 72 | 50.0% | 39.9% |
| 2022 | 52 | 17.3% | 42.9% |
| 2023 | 81 | 23.5% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Lincoln County, Geology
The ground under Lincoln County
PredictedUSGS's geologic map puts all of Lincoln County's mapped land in one class: moderate radon potential. The map puts 66.6% of Lincoln County in the area it calls Chippewa, Wisconsin Valley, and Langlade sublobes of the Superior Lobe and 33.4% in Central Plain/Northern Highland. USGS gives both a radon index of 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Chippewa, Wisconsin Valley, and Langlade sublobes of the Superior Lobe | Granite, granite-derived glacial deposits, and mafic volcanic rocks. | Moderate | 10 | 66.6% |
| Central Plain/Northern Highland | Pre-Late Wisconsinan glacial deposits derived from sandstone and carbonate rocks. | Moderate | 10 | 33.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Lincoln County beside the ground around it
Across Wisconsin 34.8% of the land is rated high; none of Lincoln County's is. Of the 5 counties that border it, 2 have more high-potential ground, Marathon County the most at 84.0%.
The map rates the ground, not the air in any home.
Local help
Lincoln County, Local resources
Radon testing and mitigation in Lincoln 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
Lincoln County, Questions
Questions about radon in Lincoln County
Are radon levels high in Lincoln County?
In 2023, 23.5% of the radon tests reported to CDC for Lincoln County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 54 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Lincoln County?
Lincoln County borders 5 counties: Marathon County, Langlade County, Oneida County, Taylor County and Price County.
Products
Lincoln County, Products
Testing a home in Lincoln County
In Lincoln County, 23.5% of 81 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 Lincoln 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
MonitorX-Sense
XR0B-SR battery digital radon monitor with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Lincoln County, Bordering counties
Counties bordering Lincoln County
Calculated by Radon411- Radon levels in Langlade CountyEPA zone 1
65.8%at or above 4 pCi/L
Median 6.0 pCi/L · 225 tests · 42.3 points above Lincoln County
- Radon levels in Marathon CountyEPA zone 1
51.9%at or above 4 pCi/L
Median 4.3 pCi/L · 349 tests · 28.4 points above Lincoln County
- Radon levels in Oneida CountyEPA zone 2
40.7%at or above 4 pCi/L
Median 2.7 pCi/L · 135 tests · 17.2 points above Lincoln County
- Radon levels in Price CountyEPA zone 2
36.7%at or above 4 pCi/L
Median 2.8 pCi/L · 60 tests · 13.2 points above Lincoln County
- Radon levels in Taylor CountyEPA zone 2
18.9%at or above 4 pCi/L
Median 2.1 pCi/L · 37 tests · 4.6 points below Lincoln County
Lincoln County, Cities and towns
Cities and towns in Lincoln County
Lincoln County's population has barely moved since 2020: 28,403 residents on July 1, 2025 against 28,423 then, by the Census Bureau's estimates. That works out to 32 people per square mile of land. Its largest town, Merrill, has 9,389 residents, 33.1% of the total. Together its 2 incorporated places hold 45.0% of those residents; the other 55.0% live outside any of them. CDC's 81 reported tests for 2023 work out to 2.9 per 1,000 residents (2025 estimate), close to Wisconsin's 3.5.
From Merrill to Tomahawk, CDC publishes no figure by town: each reads Lincoln County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Merrill | 9,389 | +0.4% | 33.1% |
| Tomahawk | 3,387 | −1.5% | 11.9% |
2 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).
Lincoln County, Homes
Homes in Lincoln County
Lincoln County is a place of houses on their own lots: 81% of its 16,233 homes are detached single-family houses, against 66% across Wisconsin. Half of its homes were built before 1975, close to Wisconsin's 1975: 35% date from before 1960 and 19% from 2000 or later. Owners live in 78% of the occupied homes (Wisconsin: 68%), so for most households a test and a fix are their own to order.
| Homes | Lincoln County | Wisconsin |
|---|---|---|
| Housing units | 16,233 | 2,750,750 |
| Detached houses | 81% | 66% |
| In buildings of 5 or more | 7% | 17% |
| Mobile homes | 6% | 3% |
| Built before 1960 | 35% | 34% |
| Built since 2000 | 19% | 20% |
| Middle year built | 1975 | 1975 |
| Owner-occupied | 78% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.