Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Ogemaw County, Michigan
EPA puts Ogemaw County in Zone 3, its lowest radon zone, and 15.0% of its 120 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
15.0%
11.9 pts below MI
- Ogemaw
- 15.0%
- Michigan
- 26.9%
120 tests, 2008 to 2017
Median result
2.0pCi/L
Below action level
- Ogemaw
- 2.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
120
75th of 82 by tests
- Ogemaw
- 120
- 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
50 of 82
Middle half
- Ogemaw
- 15.0%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Ogemaw County
Starts at Ogemaw 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. Ogemaw County's median reported result, 2008 to 2017.
The data
Ogemaw County, At a glance
Ogemaw 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 Ogemaw County, 2008 to 2017, laboratory
Under 2 pCi/L: 49%2 to 4 pCi/L: 36%4 pCi/L and above: 15%
Of 120 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 59 | 49.2% |
| 2 to 4 pCi/L | 43 | 35.8% |
| 4 pCi/L and above | 18 | 15.0% |
What these figures count
These are the 120 tests reported to CDC for Ogemaw 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).
Ogemaw County, Compared
Ogemaw County radon figures, compared
Calculated by Radon411Ogemaw County's 120 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.0 pCi/L and a maximum of 11.6 pCi/L, and 15.0% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 11.9 points higher than here.
Among its state's counties it ranks 50th 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 (49.2%) came in under 2 pCi/L, against 46.4% statewide, and 43 tests (35.8%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Ogemaw County went from 139 tests (2005 to 2014) to 120 (2008 to 2017), the share going from 14.4% to 15.0%.
EPA's 1993 zone map puts Ogemaw 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 6.2% in Crawford County to 20.5% in Alcona County, with Roscommon County, Arenac County and Iosco County below Ogemaw County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Ogemaw County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Ogemaw 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 Ogemaw County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 7 ZIP codes that lie wholly or partly in Ogemaw County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 48624 | 12% greater than 4 pCi/L, median 1.1 pCi/L, 91 tests |
| 48635 | 2 tests, figures not shown |
| 48654 | 0% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests |
| 48661 | 4% greater than 4 pCi/L, median 1.5 pCi/L, 27 tests |
| 48739 | 38% greater than 4 pCi/L, median 2.1 pCi/L, 8 tests |
| 48756 | 14% greater than 4 pCi/L, median 0.7 pCi/L, 7 tests |
| 48770 | 3 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.
Ogemaw County, Geology
The ground under Ogemaw County
PredictedUSGS's geologic map puts all of Ogemaw County's mapped land in one class: low radon potential. The map puts 85.1% of Ogemaw County in the area it calls North-Central Michigan Basin and 14.9% in Glacial Lakes. USGS gives the first a radon index of 8 and the second 7, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| North-Central Michigan Basin | Sandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites. | Low | 8 | 85.1% |
| Glacial Lakes | Silt and clay glacial lake deposits. | Low | 7 | 14.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Ogemaw County beside the ground around it
Across Michigan 9.6% of the land is rated high; none of Ogemaw County's is. Of the 7 counties that border it, 2 have more moderate-potential ground, Alcona County the most at 69.4%.
The map rates the ground, not the air in any home.
Local help
Ogemaw County, Local resources
Radon testing and mitigation in Ogemaw 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
Ogemaw County, Questions
Questions about radon in Ogemaw County
Are radon levels high in Ogemaw County?
Over the 2008 to 2017 laboratory totals, 15.0% of the radon tests reported to CDC for Ogemaw 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, 49 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Ogemaw County?
Ogemaw County borders 7 counties: Arenac County, Oscoda County, Roscommon County, Iosco County, Gladwin County, Crawford County and Alcona County.
Products
Ogemaw County, Products
Testing a home in Ogemaw County
In Ogemaw County, 15.0% of 120 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 Ogemaw 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
MonitorPYZYCKYH
RD17 plug-in radon detector with a rechargeable battery and color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Ogemaw County, Bordering counties
Counties bordering Ogemaw County
Calculated by Radon411- Radon levels in Alcona CountyEPA zone 2
20.5%at or above 4 pCi/L
Median 1.7 pCi/L · 185 tests · 5.5 points above Ogemaw County
- Radon levels in Oscoda CountyEPA zone 3
18.5%at or above 4 pCi/L
Median 2.1 pCi/L · 54 tests · 3.5 points above Ogemaw County
- Radon levels in Gladwin CountyEPA zone 3
15.4%at or above 4 pCi/L
Median 1.3 pCi/L · 247 tests · 0.4 points above Ogemaw County
- Radon levels in Roscommon CountyEPA zone 3
12.7%at or above 4 pCi/L
Median 1.0 pCi/L · 166 tests · 2.3 points below Ogemaw County
- Radon levels in Arenac CountyEPA zone 3
8.9%at or above 4 pCi/L
Median 0.7 pCi/L · 79 tests · 6.1 points below Ogemaw County
- Radon levels in Iosco CountyEPA zone 3
7.7%at or above 4 pCi/L
Median 0.7 pCi/L · 156 tests · 7.3 points below Ogemaw County
- Radon levels in Crawford CountyEPA zone 3
6.2%at or above 4 pCi/L
Median 1.3 pCi/L · 194 tests · 8.8 points below Ogemaw County
Ogemaw County, Cities and towns
Cities and towns in Ogemaw County
The Census Bureau estimates 21,121 residents in Ogemaw County for July 1, 2025, 340 more than in 2020 (+1.6%). That works out to 37 people per square mile of land. No town dominates: West Branch, the largest, has 2,370 residents, 11.2% of the total. Together its 3 incorporated places hold 15.0% of those residents; the other 85.0% live outside any of them. Reported testing is thin here: 120 tests over 2008 to 2017, or 5.7 for every 1,000 residents (2025 estimate), where Michigan as a whole comes to 11.3.
From West Branch to Prescott, CDC publishes no figure by town: each reads Ogemaw County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| West Branch | 2,370 | +1.2% | 11.2% |
| Rose City | 581 | +1.4% | 2.8% |
| Prescott | 227 | +2.3% | 1.1% |
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).
Ogemaw County, Homes
Homes in Ogemaw County
Ogemaw County is a place of houses on their own lots: 86% of its 15,326 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1976, close to Michigan's 1972: 25% date from before 1960 and 16% from 2000 or later. Owners live in 83% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.
| Homes | Ogemaw County | Michigan |
|---|---|---|
| Housing units | 15,326 | 4,599,683 |
| Detached houses | 86% | 72% |
| In buildings of 5 or more | 3% | 13% |
| Mobile homes | 9% | 5% |
| Built before 1960 | 25% | 36% |
| Built since 2000 | 16% | 15% |
| Middle year built | 1976 | 1972 |
| Owner-occupied | 83% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.