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 Calhoun County, Michigan
EPA puts Calhoun County in Zone 1, its highest radon zone, and 36.4% of its 1,649 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
36.4%
9.5 pts above MI
- Calhoun
- 36.4%
- Michigan
- 26.9%
1,649 tests, 2008 to 2017
Median result
3.0pCi/L
Below action level
- Calhoun
- 3.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
1,649
18th of 82 by tests
- Calhoun
- 1,649
- 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
11 of 82
Top quarter
- Calhoun
- 36.4%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Calhoun County
Starts at Calhoun County's median, 3.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.0 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. Calhoun County's median reported result, 2008 to 2017.
The data
Calhoun County, At a glance
Calhoun County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Calhoun County in
USGS geologic potential: High across 75% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Calhoun County, 2008 to 2017, laboratory
Under 2 pCi/L: 32%2 to 4 pCi/L: 32%4 pCi/L and above: 36%
Of 1,649 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 518 | 31.4% |
| 2 to 4 pCi/L | 531 | 32.2% |
| 4 pCi/L and above | 600 | 36.4% |
What these figures count
These are the 1,649 tests reported to CDC for Calhoun 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).
Calhoun County, Compared
Calhoun County radon figures, compared
Calculated by Radon411In Calhoun County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (600 of 1,649) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.7 points higher. Across 83 Michigan counties pooled together, 26.9% of tests reached that level, so Calhoun County runs 9.5 points above its state.
Of 7 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 30.7% (Barry County) to 55.4% (Branch County). By share, Calhoun County is 11th of 82 Michigan counties with 30 or more tests for the same period.
Half the tests came in under 3.0 pCi/L and half over it; the single highest reached 148.8 pCi/L. Below the action level, 518 tests (31.4%) came in under 2 pCi/L, against 46.4% statewide, and 531 tests (32.2%) fell between 2 and 4, against 26.7% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 36.4% share point the same way here. USGS geology rates 75% of the county's land high radon potential. CDC also counts 143 tests taken after mitigation in Calhoun County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Calhoun County went from 1,407 tests (2005 to 2014) to 1,649 (2008 to 2017), the share going from 35.6% to 36.4%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Calhoun County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Calhoun 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 Calhoun County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 22 ZIP codes that lie wholly or partly in Calhoun County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 48813 | 44% greater than 4 pCi/L, median 3.6 pCi/L, 407 tests |
| 49011 | 23% greater than 4 pCi/L, median 2.1 pCi/L, 13 tests |
| 49012 | 24% greater than 4 pCi/L, median 2.6 pCi/L, 21 tests |
| 49014 | 34% greater than 4 pCi/L, median 3.0 pCi/L, 113 tests |
| 49015 | 23% greater than 4 pCi/L, median 2.5 pCi/L, 146 tests |
| 49017 | 36% greater than 4 pCi/L, median 3.2 pCi/L, 121 tests |
| 49021 | 41% greater than 4 pCi/L, median 2.9 pCi/L, 63 tests |
| 49029 | 0% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests |
| 49033 | 65% greater than 4 pCi/L, median 4.8 pCi/L, 20 tests |
| 49034 | 79% greater than 4 pCi/L, median 5.1 pCi/L, 14 tests |
| 49037 | 3% greater than 4 pCi/L, median 0.9 pCi/L, 231 tests |
| 49051 | 8% greater than 4 pCi/L, median 1.9 pCi/L, 13 tests |
| 49052 | 10% greater than 4 pCi/L, median 0.9 pCi/L, 21 tests |
| 49068 | 36% greater than 4 pCi/L, median 2.7 pCi/L, 127 tests |
| 49076 | 30% greater than 4 pCi/L, median 2.8 pCi/L, 54 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 |
| 49224 | 29% greater than 4 pCi/L, median 2.6 pCi/L, 49 tests |
| 49237 | 50% greater than 4 pCi/L, median 4.0 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 |
| 49284 | 38% greater than 4 pCi/L, median 3.0 pCi/L, 8 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.
Calhoun County, Geology
The ground under Calhoun County
PredictedUSGS's geologic map splits Calhoun County: 75.0% of its land is high radon potential and 25.0% moderate. The map puts 75.0% of Calhoun County in the area it calls Saginaw Lobe Moraine Area and 25.0% in South-Central Michigan Basin. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).
| 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 | 75.0% |
| South-Central Michigan Basin | Sandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites. | Moderate | 10 | 25.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Calhoun County beside the ground around it
Calhoun County has more high-potential ground than Michigan as a whole: 75.0% of its land against 9.6%. Of the 7 counties that border it, 5 have more high-potential ground, Branch County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Calhoun County, Local resources
Radon testing and mitigation in Calhoun County
Listed radon businesses with an address in Calhoun 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.
Listed radon professionals by town: Battle Creek
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
Calhoun County, Questions
Questions about radon in Calhoun County
Are radon levels high in Calhoun County?
Over the 2008 to 2017 laboratory totals, 36.4% of the radon tests reported to CDC for Calhoun County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 10 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Calhoun County?
Calhoun County borders 7 counties: Branch County, Kalamazoo County, Eaton County, Hillsdale County, Jackson County, Barry County and St. Joseph County.
Products
Calhoun County, Products
Testing a home in Calhoun County
In Calhoun County, 36.4% of 1,649 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 Calhoun 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
Monitor
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
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
Calhoun County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Calhoun County
Explore
Calhoun County, Bordering counties
Counties bordering Calhoun County
Calculated by Radon411- Radon levels in Branch CountyEPA zone 1
55.4%at or above 4 pCi/L
Median 4.4 pCi/L · 1,048 tests · 19.0 points above Calhoun County
- Radon levels in Hillsdale CountyEPA zone 1
54.8%at or above 4 pCi/L
Median 4.4 pCi/L · 2,086 tests · 18.4 points above Calhoun County
- Radon levels in Jackson CountyEPA zone 1
49.7%at or above 4 pCi/L
Median 3.9 pCi/L · 2,964 tests · 13.3 points above Calhoun County
- Radon levels in Eaton CountyEPA zone 2
34.4%at or above 4 pCi/L
Median 2.8 pCi/L · 3,411 tests · 2.0 points below Calhoun County
- Radon levels in St. Joseph CountyEPA zone 1
34.1%at or above 4 pCi/L
Median 2.9 pCi/L · 1,068 tests · 2.3 points below Calhoun County
- Radon levels in Kalamazoo CountyEPA zone 1
33.3%at or above 4 pCi/L
Median 2.8 pCi/L · 4,100 tests · 3.1 points below Calhoun County
- Radon levels in Barry CountyEPA zone 2
30.7%at or above 4 pCi/L
Median 2.6 pCi/L · 1,615 tests · 5.7 points below Calhoun County
Calhoun County, Cities and towns
Cities and towns in Calhoun County
About 133,408 people live in Calhoun County by the Census Bureau's estimate for July 1, 2025, 790 fewer than in 2020 (−0.6%). That works out to 189 people per square mile of land. Its largest town, Battle Creek, has 52,021 residents, 39.0% of the total. CDC's 1,649 reported tests for 2008 to 2017 work out to 12.4 per 1,000 residents (2025 estimate), close to Michigan's 11.3.
From Battle Creek to Burlington, CDC publishes no figure by town: each reads Calhoun County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Battle Creek | 52,021 | −1.3% | 39.0% |
| Albion | 7,474 | −2.9% | 5.6% |
| Marshall | 6,800 | −0.9% | 5.1% |
| Springfield | 5,246 | −0.6% | 3.9% |
| Union Cityextends beyond Calhoun County | 1,726 | +0.2% | Counted whole |
| Homer | 1,603 | +0.7% | 1.2% |
| Athens | 952 | −1.7% | 0.7% |
| Tekonsha | 722 | +7.8% | 0.5% |
| Burlington | 306 | +0.7% | 0.2% |
9 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 Calhoun County is counted whole, so it has no share.
Calhoun County, Homes
Homes in Calhoun County
Of Calhoun County's 59,626 homes, 74% are detached houses, against 72% across Michigan; 15% are in buildings of five or more homes. The homes are older than Michigan's as a whole: half were built before 1961 (1972 for Michigan), and 49% date from before 1960. 72% of occupied homes are lived in by their owner (Michigan: 73%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Calhoun County | Michigan |
|---|---|---|
| Housing units | 59,626 | 4,599,683 |
| Detached houses | 74% | 72% |
| In buildings of 5 or more | 15% | 13% |
| Mobile homes | 6% | 5% |
| Built before 1960 | 49% | 36% |
| Built since 2000 | 10% | 15% |
| Middle year built | 1961 | 1972 |
| Owner-occupied | 72% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.