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 Boone County, Indiana
EPA puts Boone County in Zone 1, its highest radon zone, and 39.7% of its 614 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
39.7%
0.8 pts above IN
- Boone
- 39.7%
- Indiana
- 38.9%
614 tests, 2008 to 2017
Median result
3.0pCi/L
Below action level
- Boone
- 3.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
614
15th of 69 by tests
- Boone
- 614
- 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
43 of 69
Middle half
- Boone
- 39.7%
- Miami
- 63.3%
By share, of 69 with 30+ tests
Read a result for Boone County
Starts at Boone 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. Boone County's median reported result, 2008 to 2017.
The data
Boone County, At a glance
Boone County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Boone 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 Boone County, 2008 to 2017, laboratory
Under 2 pCi/L: 36%2 to 4 pCi/L: 24%4 pCi/L and above: 40%
Of 614 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 219 | 35.7% |
| 2 to 4 pCi/L | 151 | 24.6% |
| 4 pCi/L and above | 244 | 39.7% |
What these figures count
These are the 614 tests reported to CDC for Boone 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).
Boone County, Compared
Boone County radon figures, compared
Calculated by Radon411In Boone County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (244 of 614) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 4.0 points higher. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Boone County runs 0.8 points above its state.
Of 5 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 37.6% (Hamilton County) to 45.9% (Clinton County). By share, Boone County is 43rd of 69 Indiana 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 49.7 pCi/L. Below the action level, 219 tests (35.7%) came in under 2 pCi/L, against 32.8% statewide, and 151 tests (24.6%) fell between 2 and 4, against 28.3% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 39.7% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 71 tests taken after mitigation in Boone County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Boone County went from 612 tests (2005 to 2014) to 614 (2008 to 2017), the share going from 36.4% to 39.7%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Boone County, Geology
The ground under Boone County
PredictedUSGS's geologic map puts all of Boone 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Boone County beside the ground around it
Boone 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; Clinton County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Boone County, Local resources
Radon testing and mitigation in Boone 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
Boone County, Questions
Questions about radon in Boone County
Are radon levels high in Boone County?
Over the 2008 to 2017 laboratory totals, 39.7% of the radon tests reported to CDC for Boone County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 42 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Boone County?
Boone County borders 5 counties: Clinton County, Hendricks County, Hamilton County, Montgomery County and Marion County.
Products
Boone County, Products
Testing a home in Boone County
In Boone County, 39.7% of 614 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 Boone 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
MonitorX-Sense
XR0A-iR Wi-Fi battery radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Wi-Fi
- Screen, app
Method: Alpha spectrometry
First reading: Within 24 hours
Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Boone County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Boone County
Explore
Boone County, Bordering counties
Counties bordering Boone County
Calculated by Radon411- Radon levels in Clinton CountyEPA zone 1
45.9%at or above 4 pCi/L
Median 3.5 pCi/L · 85 tests · 6.2 points above Boone County
- Radon levels in Hendricks CountyEPA zone 1
41.5%at or above 4 pCi/L
Median 3.2 pCi/L · 1,170 tests · 1.8 points above Boone County
- Radon levels in Montgomery CountyEPA zone 1
41.4%at or above 4 pCi/L
Median 2.9 pCi/L · 152 tests · 1.7 points above Boone County
- Radon levels in Marion CountyEPA zone 1
40.1%at or above 4 pCi/L
Median 3.1 pCi/L · 3,668 tests · 0.4 points above Boone County
- Radon levels in Hamilton CountyEPA zone 1
37.6%at or above 4 pCi/L
Median 2.7 pCi/L · 3,479 tests · 2.1 points below Boone County
Boone County, Cities and towns
Cities and towns in Boone County
Boone County is growing: the Census Bureau puts it at 80,689 residents on July 1, 2025, up 13.5% from 71,113 in 2020. That works out to 191 people per square mile of land. Its largest town, Zionsville, has 33,624 residents, 41.7% of the total. CDC's 614 reported tests for 2008 to 2017 work out to 7.6 per 1,000 residents (2025 estimate), close to Indiana's 6.2.
From Zionsville to Ulen, CDC publishes no figure by town: each reads Boone County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Zionsville | 33,624 | +9.2% | 41.7% |
| Lebanon | 17,913 | +6.9% | 22.2% |
| Whitestown | 15,767 | +51.9% | 19.5% |
| Thorntown | 1,426 | −0.6% | 1.8% |
| Jamestownextends beyond Boone County | 960 | +2.0% | Counted whole |
| Advance | 500 | +1.6% | 0.6% |
| Ulen | 112 | +0.9% | 0.1% |
7 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 Boone County is counted whole, so it has no share.
Boone County, Homes
Homes in Boone County
Boone County is a place of houses on their own lots: 80% of its 29,019 homes are detached single-family houses, against 73% across Indiana. Much of Boone County is recent building: 41% of its homes have gone up since 2000 and the middle year built is 1994, against 1976 for Indiana. Owners live in 79% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.
| Homes | Boone County | Indiana |
|---|---|---|
| Housing units | 29,019 | 2,953,344 |
| Detached houses | 80% | 73% |
| In buildings of 5 or more | 11% | 13% |
| Mobile homes | 2% | 4% |
| Built before 1960 | 22% | 32% |
| Built since 2000 | 41% | 21% |
| Middle year built | 1994 | 1976 |
| Owner-occupied | 79% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.