Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Alcona County, Michigan
EPA puts Alcona County in Zone 2, its middle radon zone, and 20.5% of its 185 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
20.5%
6.4 pts below MI
- Alcona
- 20.5%
- Michigan
- 26.9%
185 tests, 2008 to 2017
Median result
1.7pCi/L
Below action level
- Alcona
- 1.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
185
69th of 82 by tests
- Alcona
- 185
- 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
33 of 82
Middle half
- Alcona
- 20.5%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Alcona County
Starts at Alcona County's median, 1.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.7 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. Alcona County's median reported result, 2008 to 2017.
The data
Alcona County, At a glance
Alcona County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Alcona County is a
USGS geologic potential: Moderate across 69% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Alcona County, 2008 to 2017, laboratory
Under 2 pCi/L: 56%2 to 4 pCi/L: 24%4 pCi/L and above: 20%
Of 185 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 103 | 55.7% |
| 2 to 4 pCi/L | 44 | 23.8% |
| 4 pCi/L and above | 38 | 20.5% |
What these figures count
These are the 185 tests reported to CDC for Alcona 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).
Alcona County, Compared
Alcona County radon figures, compared
Calculated by Radon411Alcona County's 185 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.7 pCi/L and a maximum of 23.8 pCi/L, and 20.5% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 6.4 points higher than here.
Among its state's counties it ranks 33rd 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, 103 tests (55.7%) came in under 2 pCi/L, against 46.4% statewide, and 44 tests (23.8%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Alcona County went from 162 tests (2005 to 2014) to 185 (2008 to 2017), the share going from 19.8% to 20.5%.
EPA's 1993 zone map puts Alcona County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 69% of the county's land moderate radon potential.
Next door, the shares run from 7.7% in Iosco County to 18.5% in Oscoda County, with Oscoda County, Ogemaw County and Montmorency County below Alcona County.
CDC also counts 5 tests taken after mitigation in Alcona 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.
Alcona County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Alcona 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 Alcona County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 12 ZIP codes that lie wholly or partly in Alcona County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 48647 | 25% greater than 4 pCi/L, median 1.3 pCi/L, 8 tests |
| 48705 | 2 tests, figures not shown |
| 48721 | 3 tests, figures not shown |
| 48728 | 3 tests, figures not shown |
| 48737 | 2 tests, figures not shown |
| 48738 | 4 tests, figures not shown |
| 48740 | 34% greater than 4 pCi/L, median 1.7 pCi/L, 35 tests |
| 48742 | 9% greater than 4 pCi/L, median 1.8 pCi/L, 23 tests |
| 48745 | 2 tests, figures not shown |
| 48750 | 0% greater than 4 pCi/L, median 0.3 pCi/L, 11 tests |
| 48762 | 17% greater than 4 pCi/L, median 3.1 pCi/L, 6 tests |
| 49747 | 26% greater than 4 pCi/L, median 2.3 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.
Alcona County, Geology
The ground under Alcona County
PredictedUSGS's geologic map splits Alcona County: 69.4% of its land is moderate radon potential and 30.5% low. The map puts 69.4% of Alcona County in the area it calls Antrim Shale and 20.0% in North-Central Michigan Basin, with one smaller area beside them. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Antrim Shale | Glacial deposits dervied in part from Antrim black shale. | Moderate | 10 | 69.4% |
| North-Central Michigan Basin | Sandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites. | Low | 8 | 20.0% |
| Glacial Lakes | Silt and clay glacial lake deposits. | Low | 7 | 10.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Alcona County beside the ground around it
Across Michigan 9.6% of the land is rated high; none of Alcona County's is. Of the 5 counties that border it, 1 has more moderate-potential ground, Montmorency County the most at 97.9%.
The map rates the ground, not the air in any home.
Local help
Alcona County, Local resources
Radon testing and mitigation in Alcona 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
Alcona County, Questions
Questions about radon in Alcona County
Are radon levels high in Alcona County?
Over the 2008 to 2017 laboratory totals, 20.5% of the radon tests reported to CDC for Alcona County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 32 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Alcona County?
Alcona County borders 5 counties: Iosco County, Alpena County, Oscoda County, Montmorency County and Ogemaw County.
Products
Alcona County, Products
Testing a home in Alcona County
In Alcona County, 20.5% of 185 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 Alcona 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
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Alcona County, Bordering counties
Counties bordering Alcona County
Calculated by Radon411- Radon levels in Oscoda CountyEPA zone 3
18.5%at or above 4 pCi/L
Median 2.1 pCi/L · 54 tests · 2.0 points below Alcona County
- Radon levels in Ogemaw CountyEPA zone 3
15.0%at or above 4 pCi/L
Median 2.0 pCi/L · 120 tests · 5.5 points below Alcona County
- Radon levels in Montmorency CountyEPA zone 2
14.7%at or above 4 pCi/L
Median 1.6 pCi/L · 191 tests · 5.8 points below Alcona County
- Radon levels in Alpena CountyEPA zone 2
13.3%at or above 4 pCi/L
Median 0.9 pCi/L · 1,139 tests · 7.2 points below Alcona County
- Radon levels in Iosco CountyEPA zone 3
7.7%at or above 4 pCi/L
Median 0.7 pCi/L · 156 tests · 12.8 points below Alcona County
Alcona County, Cities and towns
Cities and towns in Alcona County
The Census Bureau estimates 10,556 residents in Alcona County for July 1, 2025, 372 more than in 2020 (+3.7%). That works out to 16 people per square mile of land. No town dominates: Harrisville, the largest, has 443 residents, 4.2% of the total. Together its 2 incorporated places hold 7.0% of those residents; the other 93.0% live outside any of them. Testing is reported here more often than across the state: CDC's 185 reported tests for 2008 to 2017 come to 17.5 for every 1,000 residents (2025 estimate), against 11.3 for Michigan.
From Harrisville to Lincoln, CDC publishes no figure by town: each reads Alcona County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Harrisville | 443 | +2.5% | 4.2% |
| Lincoln | 299 | +3.8% | 2.8% |
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).
Alcona County, Homes
Homes in Alcona County
Alcona County is a place of houses on their own lots: 89% of its 10,353 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1974, close to Michigan's 1972: 27% date from before 1960 and 15% from 2000 or later. Owners live in 90% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.
| Homes | Alcona County | Michigan |
|---|---|---|
| Housing units | 10,353 | 4,599,683 |
| Detached houses | 89% | 72% |
| In buildings of 5 or more | 1% | 13% |
| Mobile homes | 9% | 5% |
| Built before 1960 | 27% | 36% |
| Built since 2000 | 15% | 15% |
| Middle year built | 1974 | 1972 |
| Owner-occupied | 90% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.