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
Locations and reports
Radon Levels in Branch County, Michigan
EPA puts Branch County in Zone 1, its highest radon zone, and high results are common there: 55.4% of the 1,048 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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
55.4%
28.5 pts above MI
- Branch
- 55.4%
- Michigan
- 26.9%
1,048 tests, 2008 to 2017
Median result
4.4pCi/L
Action level reached
- Branch
- 4.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
1,048
30th of 82 by tests
- Branch
- 1,048
- Oakland
- 16,224
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Michigan
2 of 82
Top quarter
- Branch
- 55.4%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Branch County
Starts at Branch County's median, 4.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.4 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Branch County's median reported result, 2008 to 2017.
The data
Branch County, At a glance
Branch County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Branch County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Branch County, 2008 to 2017, laboratory
Under 2 pCi/L: 24%2 to 4 pCi/L: 21%4 pCi/L and above: 55%
Of 1,048 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 245 | 23.4% |
| 2 to 4 pCi/L | 222 | 21.2% |
| 4 pCi/L and above | 581 | 55.4% |
What these figures count
These are the 1,048 tests reported to CDC for Branch 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).
Branch County, Compared
Branch County radon figures, compared
Calculated by Radon411More than half: 55.4% of the 1,048 radon tests reported to CDC for Branch County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 2nd of 82 Michigan counties with 30 or more tests for the same period. That is 28.5 points above the 26.9% pooled from 83 Michigan counties.
The median result, 4.4 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 55.4 pCi/L. The rest split 23.4% under 2 pCi/L and 21.2% from 2 to 4 (Michigan: 46.4% and 26.7%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 55.4% share point the same way here.
1 of its 6 bordering counties with figures ran higher, led by Steuben County, IN at 55.7%; Kalamazoo County reported 33.3%. Statewide for the same period, Lenawee County reported the highest share (56.7%) and Muskegon County the lowest (3.2%).
CDC's ten-year totals for Branch County went from 1,050 tests (2005 to 2014) to 1,048 (2008 to 2017), the share going from 54.2% to 55.4%.
Nationally, every county with a figure for the same period pools to 35.7%; Branch County sits 19.7 points above it. CDC also counts 66 tests taken after mitigation in Branch 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.
Branch County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Branch 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 Branch County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 13 ZIP codes that lie wholly or partly in Branch County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 49011 | 23% greater than 4 pCi/L, median 2.1 pCi/L, 13 tests |
| 49028 | 40% greater than 4 pCi/L, median 3.1 pCi/L, 47 tests |
| 49030 | 19% greater than 4 pCi/L, median 1.9 pCi/L, 16 tests |
| 49036 | 56% greater than 4 pCi/L, median 4.2 pCi/L, 225 tests |
| 49040 | 33% greater than 4 pCi/L, median 2.4 pCi/L, 21 tests |
| 49082 | 36% greater than 4 pCi/L, median 3.3 pCi/L, 45 tests |
| 49089 | 20% greater than 4 pCi/L, median 1.8 pCi/L, 10 tests |
| 49092 | 43% greater than 4 pCi/L, median 2.5 pCi/L, 21 tests |
| 49094 | 43% greater than 4 pCi/L, median 3.8 pCi/L, 14 tests |
| 49245 | 33% greater than 4 pCi/L, median 3.4 pCi/L, 21 tests |
| 49252 | 54% greater than 4 pCi/L, median 4.6 pCi/L, 26 tests |
| 49255 | 64% greater than 4 pCi/L, median 4.3 pCi/L, 11 tests |
| 49274 | 21% greater than 4 pCi/L, median 2.2 pCi/L, 29 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.
Branch County, Geology
The ground under Branch County
PredictedUSGS's geologic map puts all of Branch County's mapped land in one class: high radon potential. All of it lies in the area the map calls Saginaw Lobe Moraine Area, to which USGS gives a radon index of 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Saginaw Lobe Moraine Area | Glacial deposits derived from Sandstone and shale. | High | 12 | 99.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Branch County beside the ground around it
Branch County has more high-potential ground than Michigan as a whole: 100% of its land against 9.6%. Of the 6 counties that border it, none has as large a share of high-potential ground; Hillsdale County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Branch County, Local resources
Radon testing and mitigation in Branch 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
Branch County, Questions
Questions about radon in Branch County
Are radon levels high in Branch County?
Over the 2008 to 2017 laboratory totals, 55.4% of the radon tests reported to CDC for Branch County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.4 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Branch County?
Branch County borders 6 counties: Calhoun County, MI, Steuben County, IN, Hillsdale County, MI, St. Joseph County, MI, LaGrange County, IN and Kalamazoo County, MI.
Products
Branch County, Products
Testing a home in Branch County
In Branch County, 55.4% of 1,048 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. In Zone 1 the year-round level in Branch County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
MonitorAranet
Radon Plus battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Approved
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Branch County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Branch County
Explore
Branch County, Bordering counties
Counties bordering Branch County
Calculated by Radon411- Radon levels in Steuben County, INEPA zone 1
55.7%at or above 4 pCi/L
Median 4.5 pCi/L · 140 tests · 0.3 points above Branch County
- Radon levels in Hillsdale County, MIEPA zone 1
54.8%at or above 4 pCi/L
Median 4.4 pCi/L · 2,086 tests · 0.6 points below Branch County
- Radon levels in LaGrange County, INEPA zone 1
41.7%at or above 4 pCi/L
Median 3.4 pCi/L · 120 tests · 13.7 points below Branch County
- Radon levels in Calhoun County, MIEPA zone 1
36.4%at or above 4 pCi/L
Median 3.0 pCi/L · 1,649 tests · 19.0 points below Branch County
- Radon levels in St. Joseph County, MIEPA zone 1
34.1%at or above 4 pCi/L
Median 2.9 pCi/L · 1,068 tests · 21.3 points below Branch County
- Radon levels in Kalamazoo County, MIEPA zone 1
33.3%at or above 4 pCi/L
Median 2.8 pCi/L · 4,100 tests · 22.1 points below Branch County
Branch County, Cities and towns
Cities and towns in Branch County
The Census Bureau estimates 45,993 residents in Branch County for July 1, 2025, 1,116 more than in 2020 (+2.5%). That works out to 91 people per square mile of land. Its largest town, Coldwater, has 14,216 residents, 30.9% of the total. Testing is reported here more often than across the state: CDC's 1,048 reported tests for 2008 to 2017 come to 22.8 for every 1,000 residents (2025 estimate), against 11.3 for Michigan.
From Coldwater to Sherwood, CDC publishes no figure by town: each reads Branch County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Coldwater | 14,216 | +6.0% | 30.9% |
| Bronson | 2,316 | +0.3% | 5.0% |
| Union Cityextends beyond Branch County | 1,726 | +0.2% | Counted whole |
| Quincy | 1,564 | +0.4% | 3.4% |
| Sherwood | 286 | +0.7% | 0.6% |
5 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). A place that extends beyond Branch County is counted whole, so it has no share.
Branch County, Homes
Homes in Branch County
Of Branch County's 20,879 homes, 74% are detached houses, against 72% across Michigan; 13% are mobile homes. Half of its homes were built before 1969, close to Michigan's 1972: 39% date from before 1960 and 13% 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 | Branch County | Michigan |
|---|---|---|
| Housing units | 20,879 | 4,599,683 |
| Detached houses | 74% | 72% |
| In buildings of 5 or more | 7% | 13% |
| Mobile homes | 13% | 5% |
| Built before 1960 | 39% | 36% |
| Built since 2000 | 13% | 15% |
| Middle year built | 1969 | 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.