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 Gladwin County, Michigan
EPA puts Gladwin County in Zone 3, its lowest radon zone, and 15.4% of its 247 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
15.4%
11.5 pts below MI
- Gladwin
- 15.4%
- Michigan
- 26.9%
247 tests, 2008 to 2017
Median result
1.3pCi/L
Below action level
- Gladwin
- 1.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
247
62nd of 82 by tests
- Gladwin
- 247
- 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
47 of 82
Middle half
- Gladwin
- 15.4%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Gladwin County
Starts at Gladwin County's median, 1.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.3 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. Gladwin County's median reported result, 2008 to 2017.
The data
Gladwin County, At a glance
Gladwin County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Gladwin County, 2008 to 2017, laboratory
Under 2 pCi/L: 62%2 to 4 pCi/L: 23%4 pCi/L and above: 15%
Of 247 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 152 | 61.5% |
| 2 to 4 pCi/L | 57 | 23.1% |
| 4 pCi/L and above | 38 | 15.4% |
What these figures count
These are the 247 tests reported to CDC for Gladwin 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).
Gladwin County, Compared
Gladwin County radon figures, compared
Calculated by Radon411Gladwin County's 247 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.3 pCi/L and a maximum of 18.7 pCi/L, and 15.4% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 11.5 points higher than here.
Among its state's counties it ranks 47th 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, 152 tests (61.5%) came in under 2 pCi/L, against 46.4% statewide, and 57 tests (23.1%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Gladwin County went from 326 tests (2005 to 2014) to 247 (2008 to 2017), the share going from 12.9% to 15.4%.
EPA's 1993 zone map puts Gladwin County in Zone 3, a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Next door, the shares run from 5.3% in Midland County to 16.4% in Isabella County, with Ogemaw County, Clare County and Roscommon County below Gladwin County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Gladwin County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Gladwin 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 Gladwin County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 6 ZIP codes that lie wholly or partly in Gladwin County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 48612 | 9% greater than 4 pCi/L, median 0.3 pCi/L, 35 tests |
| 48613 | 1 tests, figures not shown |
| 48618 | 8% greater than 4 pCi/L, median 1.0 pCi/L, 13 tests |
| 48624 | 12% greater than 4 pCi/L, median 1.1 pCi/L, 91 tests |
| 48628 | 18% greater than 4 pCi/L, median 1.3 pCi/L, 11 tests |
| 48652 | 2 tests, figures not shown |
- 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.
Gladwin County, Geology
The ground under Gladwin County
PredictedUSGS's geologic map puts all of Gladwin County's mapped land in one class: low radon potential. The map puts 71.8% of Gladwin County in the area it calls Glacial Lakes and 28.2% in North-Central Michigan Basin. USGS gives the first a radon index of 7 and the second 8, both 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 | 71.8% |
| North-Central Michigan Basin | Sandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites. | Low | 8 | 28.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Gladwin County beside the ground around it
Across Michigan 9.6% of the land is rated high; none of Gladwin County's is. Of the 7 counties that border it, 1 has more moderate-potential ground, Isabella County the most at 26.5%.
The map rates the ground, not the air in any home.
Local help
Gladwin County, Local resources
Radon testing and mitigation in Gladwin 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
Gladwin County, Questions
Questions about radon in Gladwin County
Are radon levels high in Gladwin County?
Over the 2008 to 2017 laboratory totals, 15.4% of the radon tests reported to CDC for Gladwin County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.3 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 46 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Gladwin County?
Gladwin County borders 7 counties: Midland County, Bay County, Clare County, Arenac County, Roscommon County, Isabella County and Ogemaw County.
Products
Gladwin County, Products
Testing a home in Gladwin County
In Gladwin County, 15.4% of 247 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 Gladwin County.
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
EcoBlu plug-in digital radon monitor with a display
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Gladwin County, Bordering counties
Counties bordering Gladwin County
Calculated by Radon411- Radon levels in Isabella CountyEPA zone 3
16.4%at or above 4 pCi/L
Median 1.6 pCi/L · 870 tests · 1.0 points above Gladwin County
- Radon levels in Ogemaw CountyEPA zone 3
15.0%at or above 4 pCi/L
Median 2.0 pCi/L · 120 tests · 0.4 points below Gladwin County
- Radon levels in Clare CountyEPA zone 3
14.1%at or above 4 pCi/L
Median 1.6 pCi/L · 198 tests · 1.3 points below Gladwin County
- Radon levels in Roscommon CountyEPA zone 3
12.7%at or above 4 pCi/L
Median 1.0 pCi/L · 166 tests · 2.7 points below Gladwin County
- Radon levels in Arenac CountyEPA zone 3
8.9%at or above 4 pCi/L
Median 0.7 pCi/L · 79 tests · 6.5 points below Gladwin County
- Radon levels in Bay CountyEPA zone 3
8.5%at or above 4 pCi/L
Median 1.4 pCi/L · 624 tests · 6.9 points below Gladwin County
- Radon levels in Midland CountyEPA zone 3
5.3%at or above 4 pCi/L
Median 1.0 pCi/L · 2,006 tests · 10.1 points below Gladwin County
Gladwin County, Cities and towns
Cities and towns in Gladwin County
The Census Bureau estimates 26,077 residents in Gladwin County for July 1, 2025, 706 more than in 2020 (+2.8%). That works out to 52 people per square mile of land. No town dominates: Gladwin, the largest, has 3,140 residents, 12.0% of the total. Together its 2 incorporated places hold 16.7% of those residents; the other 83.3% live outside any of them. CDC's 247 reported tests for 2008 to 2017 work out to 9.5 per 1,000 residents (2025 estimate), close to Michigan's 11.3.
From Gladwin to Beaverton, CDC publishes no figure by town: each reads Gladwin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Gladwin | 3,140 | +2.4% | 12.0% |
| Beaverton | 1,217 | +2.5% | 4.7% |
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).
Gladwin County, Homes
Homes in Gladwin County
Gladwin County is a place of houses on their own lots: 83% of its 17,003 homes are detached single-family houses, against 72% across Michigan. Much of Gladwin County is recent building: 19% of its homes have gone up since 2000 and the middle year built is 1980, against 1972 for Michigan. Owners live in 87% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.
| Homes | Gladwin County | Michigan |
|---|---|---|
| Housing units | 17,003 | 4,599,683 |
| Detached houses | 83% | 72% |
| In buildings of 5 or more | 3% | 13% |
| Mobile homes | 12% | 5% |
| Built before 1960 | 22% | 36% |
| Built since 2000 | 19% | 15% |
| Middle year built | 1980 | 1972 |
| Owner-occupied | 87% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.