Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Mackinac County, Michigan
EPA puts Mackinac County in Zone 3, its lowest radon zone, and 19.8% of its 91 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
19.8%
7.1 pts below MI
- Mackinac
- 19.8%
- Michigan
- 26.9%
91 tests, 2008 to 2017
Median result
1.2pCi/L
Below action level
- Mackinac
- 1.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
91
78th of 82 by tests
- Mackinac
- 91
- Oakland
- 16,224
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Michigan
34 of 82
Middle half
- Mackinac
- 19.8%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Mackinac County
Starts at Mackinac County's median, 1.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.2 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Mackinac County's median reported result, 2008 to 2017.
The data
Mackinac County, At a glance
Mackinac County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 94% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Mackinac County, 2008 to 2017, laboratory
Under 2 pCi/L: 65%2 to 4 pCi/L: 15%4 pCi/L and above: 20%
Of 91 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 59 | 64.8% |
| 2 to 4 pCi/L | 14 | 15.4% |
| 4 pCi/L and above | 18 | 19.8% |
What these figures count
These are the 91 tests reported to CDC for Mackinac 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).
Mackinac County, Compared
Mackinac County radon figures, compared
Calculated by Radon411Mackinac County's 91 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.2 pCi/L and a maximum of 16.1 pCi/L, and 19.8% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 7.1 points higher than here.
Among its state's counties it ranks 34th 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, 59 tests (64.8%) came in under 2 pCi/L, against 46.4% statewide, and 14 tests (15.4%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Mackinac County went from 181 tests (2005 to 2014) to 91 (2008 to 2017), the share going from 18.8% to 19.8%.
EPA's 1993 zone map puts Mackinac County in Zone 3, a predicted county average under 2 pCi/L. USGS geology rates 94% of the county's land low radon potential.
Next door, the shares run from 11.6% in Chippewa County to 15.2% in Schoolcraft County, with Schoolcraft County and Chippewa County below Mackinac County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Mackinac County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Mackinac 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 Mackinac County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 11 ZIP codes that lie wholly or partly in Mackinac County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 49719 | 0% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests |
| 49745 | 2 tests, figures not shown |
| 49757 | 67% greater than 4 pCi/L, median 8.7 pCi/L, 6 tests |
| 49760 | 8% greater than 4 pCi/L, median 0.3 pCi/L, 13 tests |
| 49762 | 1 tests, figures not shown |
| 49775 | 2 tests, figures not shown |
| 49780 | 2 tests, figures not shown |
| 49781 | 13% greater than 4 pCi/L, median 1.2 pCi/L, 53 tests |
| 49827 | |
| 49836 | 0% greater than 4 pCi/L, median 1.2 pCi/L, 6 tests |
| 49853 | 0% greater than 4 pCi/L, median 1.5 pCi/L, 7 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.
Mackinac County, Geology
The ground under Mackinac County
PredictedUSGS's geologic map puts all of Mackinac County's mapped land in one class: low radon potential. 93.5% of it lies in the area the map calls Glacial Lakes, to which USGS gives a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Glacial Lakes | Silt and clay glacial lake deposits. | Low | 7 | 93.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Mackinac County beside the ground around it
Across Michigan 9.6% of the land is rated high; none of Mackinac County's is. Of the 3 counties that border it, 1 has more moderate-potential ground, Schoolcraft County the most at 17.9%.
The map rates the ground, not the air in any home.
Local help
Mackinac County, Local resources
Radon testing and mitigation in Mackinac 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
Mackinac County, Questions
Questions about radon in Mackinac County
Are radon levels high in Mackinac County?
Over the 2008 to 2017 laboratory totals, 19.8% of the radon tests reported to CDC for Mackinac County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.2 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 33 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Mackinac County?
Mackinac County borders 3 counties: Chippewa County, Luce County and Schoolcraft County.
Products
Mackinac County, Products
Testing a home in Mackinac County
In Mackinac County, 19.8% of 91 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Mackinac County.
Test kits and monitors3
See every kit and monitor
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
Monitor
Corentium Home 2 battery digital radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Screen, app
Method: Alpha spectrometry
Readings: Every 60 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Mackinac County, Bordering counties
Counties bordering Mackinac County
Calculated by Radon411- Radon levels in Schoolcraft CountyEPA zone 3
15.2%at or above 4 pCi/L
Median 0.6 pCi/L · 66 tests · 4.6 points below Mackinac County
- Radon levels in Chippewa CountyEPA zone 3
11.6%at or above 4 pCi/L
Median 0.9 pCi/L · 319 tests · 8.2 points below Mackinac County
- Radon levels in Luce CountyEPA zone 3
4.2%at or above 4 pCi/L
Median 1.0 pCi/L · 24 tests · 15.6 points below Mackinac County
Mackinac County, Cities and towns
Cities and towns in Mackinac County
The Census Bureau estimates 11,236 residents in Mackinac County for July 1, 2025, 415 more than in 2020 (+3.8%). That works out to 11 people per square mile of land. Its largest town, St. Ignace, has 2,351 residents, 20.9% of the total. Together its 2 incorporated places hold 26.4% of those residents; the other 73.6% live outside any of them. CDC's 91 reported tests for 2008 to 2017 work out to 8.1 per 1,000 residents (2025 estimate), close to Michigan's 11.3.
From St. Ignace to Mackinac Island, CDC publishes no figure by town: each reads Mackinac County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| St. Ignace | 2,351 | +2.9% | 20.9% |
| Mackinac Island | 617 | +6.0% | 5.5% |
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).
Mackinac County, Homes
Homes in Mackinac County
Mackinac County is a place of houses on their own lots: 82% of its 10,575 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1975, close to Michigan's 1972: 32% date from before 1960 and 16% from 2000 or later. Owners live in 77% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.
| Homes | Mackinac County | Michigan |
|---|---|---|
| Housing units | 10,575 | 4,599,683 |
| Detached houses | 82% | 72% |
| In buildings of 5 or more | 6% | 13% |
| Mobile homes | 8% | 5% |
| Built before 1960 | 32% | 36% |
| Built since 2000 | 16% | 15% |
| Middle year built | 1975 | 1972 |
| Owner-occupied | 77% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.