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 Whitley County, Indiana
EPA puts Whitley County in Zone 1, its highest radon zone, and high results are common there: 51.6% of the 184 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
51.6%
12.7 pts above IN
- Whitley
- 51.6%
- Indiana
- 38.9%
184 tests, 2008 to 2017
Median result
4.0pCi/L
Action level reached
- Whitley
- 4.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
184
31st of 69 by tests
- Whitley
- 184
- St. Joseph
- 7,346
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 Indiana
14 of 69
Top quarter
- Whitley
- 51.6%
- Miami
- 63.3%
By share, of 69 with 30+ tests
Read a result for Whitley County
Starts at Whitley County's median, 4.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 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. Whitley County's median reported result, 2008 to 2017.
The data
Whitley County, At a glance
Whitley County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Whitley 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 Whitley County, 2008 to 2017, laboratory
Under 2 pCi/L: 23%2 to 4 pCi/L: 25%4 pCi/L and above: 52%
Of 184 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 42 | 22.8% |
| 2 to 4 pCi/L | 47 | 25.5% |
| 4 pCi/L and above | 95 | 51.6% |
What these figures count
These are the 184 tests reported to CDC for Whitley 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).
Whitley County, Compared
Whitley County radon figures, compared
Calculated by Radon411More than half: 51.6% of the 184 radon tests reported to CDC for Whitley County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 14th of 69 Indiana counties with 30 or more tests for the same period. That is 12.7 points above the 38.9% pooled from 92 Indiana counties.
The median result, 4.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 70.6 pCi/L. The rest split 22.8% under 2 pCi/L and 25.5% from 2 to 4 (Indiana: 32.8% and 28.3%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 51.6% share point the same way here.
2 of its 5 bordering counties with figures ran higher, led by Wabash County at 59.3%; Allen County reported 41.8%. Statewide for the same period, Miami County reported the highest share (63.3%) and Jasper County the lowest (14.1%).
CDC's ten-year totals for Whitley County went from 113 tests (2005 to 2014) to 184 (2008 to 2017), the share going from 53.1% to 51.6%.
Nationally, every county with a figure for the same period pools to 35.7%; Whitley County sits 15.9 points above it. CDC also counts 45 tests taken after mitigation in Whitley 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.
Whitley County, Geology
The ground under Whitley County
PredictedUSGS's geologic map puts all of Whitley County's mapped land in one class: high radon potential. All of it lies in the area the map calls Huron-Erie Lobe, to which USGS gives a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Huron-Erie Lobe | Calcareous clayey and loamy glacial deposits derived from marine carbonate and clastic sedimentary rocks. | High | 13 | 99.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Whitley County beside the ground around it
Whitley County has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%. Of the 5 counties that border it, none has as large a share of high-potential ground; Huntington County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Whitley County, Local resources
Radon testing and mitigation in Whitley County
- Indiana's radon programIndiana Department of HealthIndiana's radon program licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Indiana.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
To purchase a low-cost radon short term or long term test kit, please visit the American Lung Association
- Compare kits
- Professionals in Indiana17 professionals are listed in Indiana.
What Indiana's program says
- Phone
- 1-800-272-9723
- Licensing of radon professionals
According to the Indiana Radon Rule, 410 IAC 5.1, everyone who is serving Indiana by doing radon testing, analysis and mitigation (radon reduction) in residential structures must be certified by the Indiana State Department of Health.
What it means
Whitley County, Questions
Questions about radon in Whitley County
Are radon levels high in Whitley County?
Over the 2008 to 2017 laboratory totals, 51.6% of the radon tests reported to CDC for Whitley County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.0 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 13 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Whitley County?
Whitley County borders 5 counties: Noble County, Kosciusko County, Huntington County, Allen County and Wabash County.
Products
Whitley County, Products
Testing a home in Whitley County
In Whitley County, 51.6% of 184 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 38.9% pooled across Indiana. In Zone 1 the year-round level in Whitley 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
Whitley County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Whitley County
Explore
Whitley County, Bordering counties
Counties bordering Whitley County
Calculated by Radon411- Radon levels in Wabash CountyEPA zone 1
59.3%at or above 4 pCi/L
Median 5.8 pCi/L · 91 tests · 7.7 points above Whitley County
- Radon levels in Noble CountyEPA zone 1
52.9%at or above 4 pCi/L
Median 4.3 pCi/L · 136 tests · 1.3 points above Whitley County
- Radon levels in Kosciusko CountyEPA zone 1
50.6%at or above 4 pCi/L
Median 4.0 pCi/L · 1,248 tests · 1.0 points below Whitley County
- Radon levels in Huntington CountyEPA zone 1
43.8%at or above 4 pCi/L
Median 3.5 pCi/L · 169 tests · 7.8 points below Whitley County
- Radon levels in Allen CountyEPA zone 1
41.8%at or above 4 pCi/L
Median 3.3 pCi/L · 3,990 tests · 9.8 points below Whitley County
Whitley County, Cities and towns
Cities and towns in Whitley County
The Census Bureau estimates 35,046 residents in Whitley County for July 1, 2025, 709 more than in 2020 (+2.1%). That works out to 104 people per square mile of land. Its largest town, Columbia City, has 10,256 residents, 29.3% of the total. Together its 4 incorporated places hold 40.6% of those residents; the other 59.4% live outside any of them. CDC's 184 reported tests for 2008 to 2017 work out to 5.3 per 1,000 residents (2025 estimate), close to Indiana's 6.2.
From Columbia City to Larwill, CDC publishes no figure by town: each reads Whitley County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Columbia City | 10,256 | +2.9% | 29.3% |
| Churubusco | 1,853 | −1.0% | 5.3% |
| South Whitley | 1,850 | +1.5% | 5.3% |
| Larwill | 274 | +0.7% | 0.8% |
4 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).
Whitley County, Homes
Homes in Whitley County
Whitley County is a place of houses on their own lots: 83% of its 14,940 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1981, close to Indiana's 1976: 33% date from before 1960 and 23% from 2000 or later. Owners live in 80% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.
| Homes | Whitley County | Indiana |
|---|---|---|
| Housing units | 14,940 | 2,953,344 |
| Detached houses | 83% | 73% |
| In buildings of 5 or more | 6% | 13% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 33% | 32% |
| Built since 2000 | 23% | 21% |
| Middle year built | 1981 | 1976 |
| Owner-occupied | 80% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.