Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Marinette County, Wisconsin
EPA puts Marinette County in Zone 2, its middle radon zone, and high results are common there: 44.3% of the 61 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
44.3%
8.6 pts above WI
- Marinette
- 44.3%
- Wisconsin
- 35.7%
61 tests, 2023
Median result
2.6pCi/L
Below action level
- Marinette
- 2.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
61
52nd of 69 by tests
- Marinette
- 61
- 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
19 of 69
Middle half
- Marinette
- 44.3%
- Langlade
- 65.8%
By share, of 69 with 30+ tests
Read a result for Marinette County
Starts at Marinette County's median, 2.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.6 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. Marinette County's median reported result, 2023.
The data
Marinette County, At a glance
Marinette County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Marinette County is a
USGS geologic potential: Moderate across 96% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Marinette County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 25.6% |
| 2015 | 29.0% |
| 2016 | 30.8% |
| 2017 | 27.2% |
| 2019 | 24.8% |
| 2020 | 25.7% |
| 2021 | 11.9% |
| 2022 | 36.4% |
| 2023 | 44.3% |
2023: 44.3%. Across these years the share ran from 11.9% to 44.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 61 tests reported to CDC for Marinette 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).
Marinette County, Compared
Marinette County radon figures, compared
Calculated by Radon411In Marinette County, about 4 in 10 reported tests in 2023 (27 of 61) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 10.9 points higher. Across 72 Wisconsin counties pooled together, 35.7% of tests reached that level, so Marinette County runs 8.6 points above its state.
Of 2 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 40.0% (Forest County) to 52.3% (Oconto County). By share, Marinette County is 19th of 69 Wisconsin counties with 30 or more tests for the same period.
Year by year, 2014 opened at 25.6% and 2023 closed at 44.3% (up 18.7 points), with 2023 the high at 44.3%. Half the tests came in under 2.6 pCi/L and half over it; the single highest reached 20.3 pCi/L. Below the action level, 28 tests (45.9%) came in under 2 pCi/L, against 41.4% statewide, and 6 tests (9.8%) 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 44.3% share point the same way here. USGS geology rates 96% of the county's land moderate radon potential.
The busiest year on file was 2015, with 193 tests reported; the quietest, 2022, had 22.
Marinette CountyWisconsin, pooled
44.3% % of tests35.7% % of tests
| Year | Tests | Marinette County, at or above 4 pCi/L | Wisconsin, pooled |
|---|---|---|---|
| 2014 | 39 | 25.6% | 51.1% |
| 2015 | 193 | 29.0% | 51.6% |
| 2016 | 185 | 30.8% | 45.2% |
| 2017 | 92 | 27.2% | 44.8% |
| 2019 | 109 | 24.8% | 42.9% |
| 2020 | 35 | 25.7% | 27.0% |
| 2021 | 42 | 11.9% | 39.9% |
| 2023 | 61 | 44.3% | 35.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Marinette County, Geology
The ground under Marinette County
PredictedMost of the ground under Marinette County is one class on USGS's geologic map: 95.8% of its land is moderate radon potential, with 4.1% high. The map puts 85.7% of Marinette County in the area it calls Green Bay Lobe and 9.4% in Chippewa, Wisconsin Valley, and Langlade sublobes of the Superior Lobe, with 2 smaller areas beside them. 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 |
|---|---|---|---|---|
| Green Bay Lobe | Glacial deposits derived from carbonate and igneous rocks. | Moderate | 10 | 85.7% |
| Chippewa, Wisconsin Valley, and Langlade sublobes of the Superior Lobe | Granite, granite-derived glacial deposits, and mafic volcanic rocks. | Moderate | 10 | 9.4% |
| Wolf River Batholith | Plutonic granitic rocks including quartz monzonite, syenite, monzonite, anorthosite. | High | 13 | 4.1% |
| Outer Michigan Basin | Glacial deposits derived from Paleozoic carbonate rocks and sandstones. | Moderate | 10 | 0.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Marinette County beside the ground around it
Wisconsin as a whole has more high-potential ground than Marinette County: 34.8% of its land, against 4.1% here. Of the 5 counties that border it, 1 has more high-potential ground, Oconto County the most at 32.6%.
The map rates the ground, not the air in any home.
Local help
Marinette County, Local resources
Radon testing and mitigation in Marinette 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
Marinette County, Questions
Questions about radon in Marinette County
Are radon levels high in Marinette County?
In 2023, 44.3% of the radon tests reported to CDC for Marinette County, Wisconsin were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.6 pCi/L. Of 69 Wisconsin counties with 30 or more tests for the same period, 18 reported a higher share; pooled, the state comes to 35.7%.
Which counties border Marinette County?
Marinette County borders 5 counties: Oconto County, WI, Menominee County, MI, Florence County, WI, Dickinson County, MI and Forest County, WI.
Products
Marinette County, Products
Testing a home in Marinette County
In Marinette County, 44.3% of 61 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 Marinette 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
MonitorPYZYCKYH
RD17 plug-in radon detector with a rechargeable battery and color screen
- 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
Marinette County, Bordering counties
Counties bordering Marinette County
Calculated by Radon411- Radon levels in Oconto County, WIEPA zone 2
52.3%at or above 4 pCi/L
Median 4.5 pCi/L · 130 tests · 8.0 points above Marinette County
- Radon levels in Florence County, WIEPA zone 2
43.8%at or above 4 pCi/L
Median 3.7 pCi/L · 16 tests · 0.5 points below Marinette County
- Radon levels in Forest County, WIEPA zone 2
40.0%at or above 4 pCi/L
Median 2.9 pCi/L · 45 tests · 4.3 points below Marinette County
- Radon levels in Menominee County, MIEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in Dickinson County, MIEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
Marinette County, Cities and towns
Cities and towns in Marinette County
The Census Bureau estimates 42,574 residents in Marinette County for July 1, 2025, 687 more than in 2020 (+1.6%). That works out to 30 people per square mile of land. Its largest town, Marinette, has 11,168 residents, 26.2% of the total. Together its 7 incorporated places hold 44.6% of those residents; the other 55.4% live outside any of them. Reported testing is thin here: 61 tests over 2023, or 1.4 for every 1,000 residents (2025 estimate), where Wisconsin as a whole comes to 3.5.
From Marinette to Pound, CDC publishes no figure by town: each reads Marinette County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Marinette | 11,168 | +0.5% | 26.2% |
| Peshtigo | 3,423 | +0.1% | 8.0% |
| Niagara | 1,577 | −1.4% | 3.7% |
| Crivitz | 1,137 | +4.1% | 2.7% |
| Coleman | 738 | +1.2% | 1.7% |
| Wausaukee | 594 | −0.3% | 1.4% |
| Pound | 351 | −1.1% | 0.8% |
7 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).
Marinette County, Homes
Homes in Marinette County
Marinette County is a place of houses on their own lots: 80% of its 29,372 homes are detached single-family houses, against 66% across Wisconsin. Half of its homes were built before 1975, close to Wisconsin's 1975: 31% date from before 1960 and 18% from 2000 or later. Owners live in 80% of the occupied homes (Wisconsin: 68%), so for most households a test and a fix are their own to order.
| Homes | Marinette County | Wisconsin |
|---|---|---|
| Housing units | 29,372 | 2,750,750 |
| Detached houses | 80% | 66% |
| In buildings of 5 or more | 5% | 17% |
| Mobile homes | 12% | 3% |
| Built before 1960 | 31% | 34% |
| Built since 2000 | 18% | 20% |
| Middle year built | 1975 | 1975 |
| Owner-occupied | 80% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.