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 Marquette County, Michigan
EPA puts Marquette County in Zone 2, its middle radon zone, and 23.4% of its 1,082 reported radon tests (2008 to 2017, laboratory totals) 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
23.4%
3.5 pts below MI
- Marquette
- 23.4%
- Michigan
- 26.9%
1,082 tests, 2008 to 2017
Median result
2.0pCi/L
Below action level
- Marquette
- 2.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
1,082
27th of 82 by tests
- Marquette
- 1,082
- Oakland
- 16,224
Reported to CDC before any fix, 2008 to 2017
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 Michigan
27 of 82
Middle half
- Marquette
- 23.4%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Marquette County
Starts at Marquette County's median, 2.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.0 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. Marquette County's median reported result, 2008 to 2017.
The data
Marquette County, At a glance
Marquette County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Marquette 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 Marquette County, 2008 to 2017, laboratory
Under 2 pCi/L: 49%2 to 4 pCi/L: 28%4 pCi/L and above: 23%
Of 1,082 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 529 | 48.9% |
| 2 to 4 pCi/L | 300 | 27.7% |
| 4 pCi/L and above | 253 | 23.4% |
What these figures count
These are the 1,082 tests reported to CDC for Marquette County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Marquette County, Compared
Marquette County radon figures, compared
Calculated by Radon411Marquette County's 1,082 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.0 pCi/L and a maximum of 131.0 pCi/L, and 23.4% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 3.5 points higher than here.
Among its state's counties it ranks 27th of 82 Michigan counties with 30 or more tests for the same period. Statewide for the same period, Lenawee County reported the highest share (56.7%) and Muskegon County the lowest (3.2%).
Below the action level, 529 tests (48.9%) came in under 2 pCi/L, against 46.4% statewide, and 300 tests (27.7%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Marquette County went from 943 tests (2005 to 2014) to 1,082 (2008 to 2017), the share going from 22.8% to 23.4%.
EPA's 1993 zone map puts Marquette 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 11.0% in Baraga County to 39.3% in Dickinson County, with Delta County, Alger County and Menominee County below Marquette County.
CDC also counts 21 tests taken after mitigation in Marquette County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Marquette County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Marquette County, with their period. These are not CDC's figures and are never added to them.
MeasuredState figures, not CDC's
What Michigan EGLE reports for the ZIP codes in Marquette County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 13 ZIP codes that lie wholly or partly in Marquette County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 49814 | 75% greater than 4 pCi/L, median 6.0 pCi/L, 8 tests |
| 49818 | 31% greater than 4 pCi/L, median 2.7 pCi/L, 13 tests |
| 49822 | 1 tests, figures not shown |
| 49831 | 0% greater than 4 pCi/L, median 1.9 pCi/L, 6 tests |
| 49841 | 72% greater than 4 pCi/L, median 7.1 pCi/L, 85 tests |
| 49849 | 18% greater than 4 pCi/L, median 1.6 pCi/L, 79 tests |
| 49855 | 9% greater than 4 pCi/L, median 1.6 pCi/L, 203 tests |
| 49861 | 79% greater than 4 pCi/L, median 7.5 pCi/L, 14 tests |
| 49866 | 24% greater than 4 pCi/L, median 2.0 pCi/L, 78 tests |
| 49871 | 2 tests, figures not shown |
| 49879 | 65% greater than 4 pCi/L, median 5.0 pCi/L, 17 tests |
| 49880 | 38% greater than 4 pCi/L, median 3.1 pCi/L, 16 tests |
| 49885 | 17% greater than 4 pCi/L, median 1.9 pCi/L, 12 tests |
- EGLE's figures cover first-time tests only, from organizations willing to provide data.
- EGLE does not publish figures for a ZIP code with fewer than 5 test results.
- EGLE says the map is not intended to decide whether a home should be tested: all homes should be tested.
- ZIP code boundaries are postal delivery areas, not legal or administrative boundaries.
- A ZIP code that crosses the county line is listed whole; its figures cover all of it.
Measured: Michigan EGLE data, About 10 years to 2026-05-15.
Marquette County, Geology
The ground under Marquette County
PredictedUSGS's geologic map puts all of Marquette County's mapped land in one class: moderate radon potential. The map puts 65.3% of Marquette County in the area it calls Marquette Highland/Keweenaw Peninsula/Gogebic Range and 34.6% in Outer Michigan Basin. USGS gives the first a radon index of 11 and the second 10, both in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Marquette Highland/Keweenaw Peninsula/Gogebic Range | Granite, iron formtion, sandstone, conglomerate, metamorphic rocks, and glacial drift. | Moderate | 11 | 65.3% |
| Outer Michigan Basin | Glacial deposits derived from Paleozoic carbonate rocks and sandstones. | Moderate | 10 | 34.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Marquette County beside the ground around it
Across Michigan 9.6% of the land is rated high; none of Marquette County's is. Of the 6 counties that border it, 2 have more moderate-potential ground, Dickinson County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Marquette County, Local resources
Radon testing and mitigation in Marquette County
- Michigan Indoor Radon ProgramMichigan Indoor Radon Program, run by Michigan Department of Environment, Great Lakes, and Energy, does not license radon professionals, and answers questions about testing and mitigation in Michigan.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Michigan69 professionals are listed in Michigan.
What Michigan's program says
- Phone
- 800-723-6642
- Radon@Michigan.gov
- Licensing of radon professionals
Michigan does not license or regulate radon testing and mitigation contractors.
What it means
Marquette County, Questions
Questions about radon in Marquette County
Are radon levels high in Marquette County?
Over the 2008 to 2017 laboratory totals, 23.4% of the radon tests reported to CDC for Marquette County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 26 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Marquette County?
Marquette County borders 6 counties: Dickinson County, Baraga County, Alger County, Iron County, Delta County and Menominee County.
Products
Marquette County, Products
Testing a home in Marquette County
In Marquette County, 23.4% of 1,082 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Marquette 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
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Marquette County, Bordering counties
Counties bordering Marquette County
Calculated by Radon411- Radon levels in Dickinson CountyEPA zone 2
39.3%at or above 4 pCi/L
Median 3.1 pCi/L · 843 tests · 15.9 points above Marquette County
- Radon levels in Iron CountyEPA zone 2
36.2%at or above 4 pCi/L
Median 2.6 pCi/L · 265 tests · 12.8 points above Marquette County
- Radon levels in Delta CountyEPA zone 3
21.5%at or above 4 pCi/L
Median 1.7 pCi/L · 711 tests · 1.9 points below Marquette County
- Radon levels in Alger CountyEPA zone 2
16.4%at or above 4 pCi/L
Median 1.2 pCi/L · 189 tests · 7.0 points below Marquette County
- Radon levels in Menominee CountyEPA zone 2
11.7%at or above 4 pCi/L
Median 1.2 pCi/L · 120 tests · 11.7 points below Marquette County
- Radon levels in Baraga CountyEPA zone 2
11.0%at or above 4 pCi/L
Median 1.1 pCi/L · 163 tests · 12.4 points below Marquette County
Marquette County, Cities and towns
Cities and towns in Marquette County
The Census Bureau estimates 68,064 residents in Marquette County for July 1, 2025, 1,522 more than in 2020 (+2.3%). That works out to 38 people per square mile of land. Its largest town, Marquette, has 21,944 residents, 32.2% of the total. Together its 3 incorporated places hold 48.2% of those residents; the other 51.8% live outside any of them. CDC's 1,082 reported tests for 2008 to 2017 work out to 15.9 per 1,000 residents (2025 estimate), close to Michigan's 11.3.
From Marquette to Negaunee, CDC publishes no figure by town: each reads Marquette County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Marquette | 21,944 | +3.9% | 32.2% |
| Ishpeming | 6,205 | +0.8% | 9.1% |
| Negaunee | 4,663 | +1.0% | 6.9% |
3 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).
Marquette County, Homes
Homes in Marquette County
Of Marquette County's 33,553 homes, 71% are detached houses, against 72% across Michigan; 12% are in buildings of five or more homes. Half of its homes were built before 1971, close to Michigan's 1972: 37% date from before 1960 and 13% from 2000 or later. 71% of occupied homes are lived in by their owner (Michigan: 73%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Marquette County | Michigan |
|---|---|---|
| Housing units | 33,553 | 4,599,683 |
| Detached houses | 71% | 72% |
| In buildings of 5 or more | 12% | 13% |
| Mobile homes | 5% | 5% |
| Built before 1960 | 37% | 36% |
| Built since 2000 | 13% | 15% |
| Middle year built | 1971 | 1972 |
| Owner-occupied | 71% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.