Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Kosciusko County, Indiana
EPA puts Kosciusko County in Zone 1, its highest radon zone, and high results are common there: 50.6% of the 1,248 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
50.6%
11.7 pts above IN
- Kosciusko
- 50.6%
- Indiana
- 38.9%
1,248 tests, 2008 to 2017
Median result
4.0pCi/L
Action level reached
- Kosciusko
- 4.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
1,248
9th of 69 by tests
- Kosciusko
- 1,248
- 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
15 of 69
Top quarter
- Kosciusko
- 50.6%
- Miami
- 63.3%
By share, of 69 with 30+ tests
Read a result for Kosciusko County
Starts at Kosciusko 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. Kosciusko County's median reported result, 2008 to 2017.
The data
Kosciusko County, At a glance
Kosciusko County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Kosciusko 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 Kosciusko County, 2008 to 2017, laboratory
Under 2 pCi/L: 27%2 to 4 pCi/L: 22%4 pCi/L and above: 51%
Of 1,248 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 338 | 27.1% |
| 2 to 4 pCi/L | 279 | 22.4% |
| 4 pCi/L and above | 631 | 50.6% |
What these figures count
These are the 1,248 tests reported to CDC for Kosciusko 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).
Kosciusko County, Compared
Kosciusko County radon figures, compared
Calculated by Radon411More than half: 50.6% of the 1,248 radon tests reported to CDC for Kosciusko County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 15th of 69 Indiana counties with 30 or more tests for the same period. That is 11.7 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 63.2 pCi/L. The rest split 27.1% under 2 pCi/L and 22.4% from 2 to 4 (Indiana: 32.8% and 28.3%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 50.6% share point the same way here.
3 of its 6 bordering counties with figures ran higher, led by Wabash County at 59.3%; Marshall County reported 39.7%. 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 Kosciusko County went from 673 tests (2005 to 2014) to 1,248 (2008 to 2017), the share going from 51.9% to 50.6%.
Nationally, every county with a figure for the same period pools to 35.7%; Kosciusko County sits 14.9 points above it. CDC also counts 286 tests taken after mitigation in Kosciusko 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.
Kosciusko County, Geology
The ground under Kosciusko County
PredictedUSGS's geologic map puts all of Kosciusko County's mapped land in one class: high radon potential. The map puts 82.3% of Kosciusko County in the area it calls Saginaw Lobe and 17.7% in Huron-Erie Lobe. USGS gives the first a radon index of 12 and the second 13, both in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Saginaw Lobe | Clayey and loamy glacial deposits. | High | 12 | 82.3% |
| Huron-Erie Lobe | Calcareous clayey and loamy glacial deposits derived from marine carbonate and clastic sedimentary rocks. | High | 13 | 17.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Kosciusko County beside the ground around it
Kosciusko County has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%. Of the 6 counties that border it, none has as large a share of high-potential ground; Elkhart County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Kosciusko County, Local resources
Radon testing and mitigation in Kosciusko 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
Kosciusko County, Questions
Questions about radon in Kosciusko County
Are radon levels high in Kosciusko County?
Over the 2008 to 2017 laboratory totals, 50.6% of the radon tests reported to CDC for Kosciusko 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, 14 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Kosciusko County?
Kosciusko County borders 6 counties: Whitley County, Marshall County, Noble County, Fulton County, Elkhart County and Wabash County.
Products
Kosciusko County, Products
Testing a home in Kosciusko County
In Kosciusko County, 50.6% of 1,248 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 Kosciusko 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
EcoQube Flex battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 15 minutes
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Kosciusko County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Kosciusko County
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Kosciusko County, Bordering counties
Counties bordering Kosciusko 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 · 8.7 points above Kosciusko County
- Radon levels in Noble CountyEPA zone 1
52.9%at or above 4 pCi/L
Median 4.3 pCi/L · 136 tests · 2.3 points above Kosciusko County
- Radon levels in Whitley CountyEPA zone 1
51.6%at or above 4 pCi/L
Median 4.0 pCi/L · 184 tests · 1.0 points above Kosciusko County
- Radon levels in Fulton CountyEPA zone 1
46.4%at or above 4 pCi/L
Median 3.3 pCi/L · 97 tests · 4.2 points below Kosciusko County
- Radon levels in Elkhart CountyEPA zone 1
46.4%at or above 4 pCi/L
Median 3.7 pCi/L · 2,856 tests · 4.2 points below Kosciusko County
- Radon levels in Marshall CountyEPA zone 1
39.7%at or above 4 pCi/L
Median 3.2 pCi/L · 383 tests · 10.9 points below Kosciusko County
Kosciusko County, Cities and towns
Cities and towns in Kosciusko County
The Census Bureau estimates 80,892 residents in Kosciusko County for July 1, 2025, 740 more than in 2020 (+0.9%). That works out to 152 people per square mile of land. No town dominates: Warsaw, the largest, has 16,130 residents, 19.9% of the total. Testing is reported here more often than across the state: CDC's 1,248 reported tests for 2008 to 2017 come to 15.4 for every 1,000 residents (2025 estimate), against 6.2 for Indiana.
From Warsaw to Burket, CDC publishes no figure by town: each reads Kosciusko County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Warsaw | 16,130 | +2.0% | 19.9% |
| Nappaneeextends beyond Kosciusko County | 6,885 | −0.8% | Counted whole |
| Winona Lake | 5,126 | +1.3% | 6.3% |
| Syracuseextends beyond Kosciusko County | 3,238 | +0.1% | Counted whole |
| Milford | 1,686 | +0.3% | 2.1% |
| North Webster | 1,001 | +0.9% | 1.2% |
| Pierceton | 934 | +0.1% | 1.2% |
| Mentone | 923 | −2.1% | 1.1% |
| Silver Lake | 875 | +0.6% | 1.1% |
| Etna Green | 576 | +1.9% | 0.7% |
| Leesburg | 550 | Level | 0.7% |
| Claypool | 396 | +0.3% | 0.5% |
- Sidney
- Burket
14 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Kosciusko County is counted whole, so it has no share.
Kosciusko County, Homes
Homes in Kosciusko County
Kosciusko County is a place of houses on their own lots: 75% of its 38,587 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1979, close to Indiana's 1976: 30% date from before 1960 and 21% from 2000 or later. Owners live in 77% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.
| Homes | Kosciusko County | Indiana |
|---|---|---|
| Housing units | 38,587 | 2,953,344 |
| Detached houses | 75% | 73% |
| In buildings of 5 or more | 7% | 13% |
| Mobile homes | 10% | 4% |
| Built before 1960 | 30% | 32% |
| Built since 2000 | 21% | 21% |
| Middle year built | 1979 | 1976 |
| Owner-occupied | 77% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.