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 Keweenaw County, Michigan
EPA puts Keweenaw County in Zone 2, its middle radon zone, and 22.7% of its 44 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
22.7%
4.2 pts below MI
- Keweenaw
- 22.7%
- Michigan
- 26.9%
44 tests, 2008 to 2017
Median result
0.9pCi/L
Below action level
- Keweenaw
- 0.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
44
82nd of 82 by tests
- Keweenaw
- 44
- 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
29 of 82
Middle half
- Keweenaw
- 22.7%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Keweenaw County
Starts at Keweenaw County's median, 0.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.9 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. Keweenaw County's median reported result, 2008 to 2017.
The data
Keweenaw County, At a glance
Keweenaw County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Keweenaw County is a
USGS geologic potential: Moderate across 95% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Keweenaw County, 2008 to 2017, laboratory
Under 2 pCi/L: 66%2 to 4 pCi/L: 11%4 pCi/L and above: 23%
Of 44 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 29 | 65.9% |
| 2 to 4 pCi/L | 5 | 11.4% |
| 4 pCi/L and above | 10 | 22.7% |
What these figures count
These are the 44 tests reported to CDC for Keweenaw 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).
Keweenaw County, Compared
Keweenaw County radon figures, compared
Calculated by Radon411Keweenaw County's 44 reported tests over the 2008 to 2017 laboratory totals had a middle value of 0.9 pCi/L and a maximum of 14.4 pCi/L, and 22.7% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 4.2 points higher than here.
Among its state's counties it ranks 29th 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, 29 tests (65.9%) came in under 2 pCi/L, against 46.4% statewide, and 5 tests (11.4%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Keweenaw County went from 36 tests (2005 to 2014) to 44 (2008 to 2017), the share going from 8.3% to 22.7%.
EPA's 1993 zone map puts Keweenaw County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 95% of the county's land moderate radon potential.
Houghton County, the one bordering county with a figure for the same period, reported 10.8%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Keweenaw County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Keweenaw 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 Keweenaw County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 6 ZIP codes that lie wholly or partly in Keweenaw County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 49805 | 4 tests, figures not shown |
| 49901 | 3 tests, figures not shown |
| 49913 | 3% greater than 4 pCi/L, median 0.6 pCi/L, 87 tests |
| 49918 | 4 tests, figures not shown |
| 49945 | 0% greater than 4 pCi/L, median 1.1 pCi/L, 29 tests |
| 49950 | 0% greater than 4 pCi/L, median 1.0 pCi/L, 23 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.
Keweenaw County, Geology
The ground under Keweenaw County
PredictedUSGS's geologic map puts all of Keweenaw County's mapped land in one class: moderate radon potential. 94.6% of it lies in the area the map calls Marquette Highland/Keweenaw Peninsula/Gogebic Range, to which USGS gives a radon index of 11, 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 formation, sandstone, conglomerate, metamorphic rocks, and glacial drift. | Moderate | 11 | 94.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Keweenaw County beside the ground around it
Across Michigan 9.6% of the land is rated high; none of Keweenaw County's is. Of the one county that borders it, none has as large a share of moderate-potential ground; Houghton County comes nearest at 81.1%.
The map rates the ground, not the air in any home.
Local help
Keweenaw County, Local resources
Radon testing and mitigation in Keweenaw 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
Keweenaw County, Questions
Questions about radon in Keweenaw County
Are radon levels high in Keweenaw County?
Over the 2008 to 2017 laboratory totals, 22.7% of the radon tests reported to CDC for Keweenaw County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 28 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Keweenaw County?
Keweenaw County borders 1 county: Houghton County.
Products
Keweenaw County, Products
Testing a home in Keweenaw County
In Keweenaw County, 22.7% of 44 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 Keweenaw County; a long-term test tells the year-round average.
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
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Keweenaw County, Bordering counties
Counties bordering Keweenaw County
Calculated by Radon411- Radon levels in Houghton CountyEPA zone 2
10.8%at or above 4 pCi/L
Median 1.1 pCi/L · 1,093 tests · 11.9 points below Keweenaw County
Keweenaw County, Cities and towns
Cities and towns in Keweenaw County
Keweenaw County is growing: the Census Bureau puts it at 2,186 residents on July 1, 2025, up 6.2% from 2,059 in 2020. Spread over its land, that is 4.0 people to the square mile. Ahmeek, its one incorporated place, has 120 residents, 5.5% of the total. Testing is reported here more often than across the state: CDC's 44 reported tests for 2008 to 2017 come to 20.1 for every 1,000 residents (2025 estimate), against 11.3 for Michigan.
Ahmeek is the one incorporated place here; CDC publishes no figure by town, so it reads Keweenaw County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Ahmeek | 120 | +5.3% | 5.5% |
One incorporated place, 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).
Keweenaw County, Homes
Homes in Keweenaw County
Keweenaw County is a place of houses on their own lots: 95% of its 2,292 homes are detached single-family houses, against 72% across Michigan. The homes are older than Michigan's as a whole: half were built before 1964 (1972 for Michigan), and 46% date from before 1960. Owners live in 92% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.
| Homes | Keweenaw County | Michigan |
|---|---|---|
| Housing units | 2,292 | 4,599,683 |
| Detached houses | 95% | 72% |
| In buildings of 5 or more | 1% | 13% |
| Mobile homes | 2% | 5% |
| Built before 1960 | 46% | 36% |
| Built since 2000 | 16% | 15% |
| Middle year built | 1964 | 1972 |
| Owner-occupied | 92% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.