Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Spencer County, Indiana
EPA puts Spencer County in Zone 2, its middle radon zone, and only 25 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
44.1%
Dubois County
- Dubois
- 44.1%
- Daviess
- 20.0%
3 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
20.9%
Warrick County, 15 miles
- Warrick
- 20.9%
- Indiana
- 38.9%
Share at 4+ pCi/L, 561 tests, 2008 to 2017
Ground above low
100.0%
Level with Indiana
- Spencer
- 100.0%
- Indiana
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
25
Too few for a share
- Spencer
- 25
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Spencer County
Starts at EPA's action level
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.
The data
Spencer County, At a glance
Spencer County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Spencer County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Spencer County, 2008 to 2017, laboratory
CDC holds 25 reported tests for Spencer County over the 2008 to 2017 laboratory totals, with a median of 4.5 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Spencer County beside the counties around it is how this page reads it.
What these figures count
Only 25 tests were reported to CDC for Spencer County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Spencer County, Compared
Spencer County radon figures, compared
Calculated by Radon411CDC's largest figure for Spencer County rests on 25 tests over the 2008 to 2017 laboratory totals, 15 of them at or above 4 pCi/L, so each test moves its share by 4.0 points and no rank or comparison is drawn from it. Results reached as high as 12.3 pCi/L, with a middle value of 4.5 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Dubois County reported the largest share at or above 4 pCi/L, 44.1%, and Daviess County, KY the smallest, 20.0%, with Warrick County at 20.9% between. Farther out, Vanderburgh County (32 miles away) at 24.4%, Gibson County (38 miles away) at 43.3% and Posey County (47 miles away) at 35.3% have figures too. Pooled across 92 Indiana counties, 38.9% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Miami County reported the highest share (63.3%) and Jasper County the lowest (14.1%). EPA's 1993 map puts Spencer County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Spencer County, Geology
The ground under Spencer County
PredictedUSGS's geologic map puts all of Spencer County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Wabash Lowland, to which USGS gives a radon index of 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Wabash Lowland | Loess, pre-Wisconsinan glacial deposits, Pennsylvanian shale, sandstone, and carbonate bedrock. | Moderate | 10 | 99.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Spencer County beside the ground around it
Across Indiana 56.6% of the land is rated high; none of Spencer County's is. Of the 5 counties that border it, none has as large a share of moderate-potential ground; Warrick County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Spencer County, Local resources
Radon testing and mitigation in Spencer 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
Spencer County, Questions
Questions about radon in Spencer County
Are radon levels high in Spencer County?
Over the 2008 to 2017 laboratory totals, 60.0% of the radon tests reported to CDC for Spencer County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.5 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Dubois County reported the largest share at or above 4 pCi/L, 44.1%, and Daviess County, KY the smallest, 20.0%, with Warrick County at 20.9% between.
Which counties border Spencer County?
Spencer County borders 5 counties: Warrick County, IN, Daviess County, KY, Hancock County, KY, Perry County, IN and Dubois County, IN.
Products
Spencer County, Products
Testing a home in Spencer County
No CDC figure names Spencer County; the nearest county with one, Warrick County (15 miles away), reported 20.9% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Spencer County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Spencer County, Bordering counties
Counties bordering Spencer County
Calculated by Radon411- Radon levels in Dubois County, INEPA zone 2
44.1%at or above 4 pCi/L
Median 3.7 pCi/L · 136 tests
- Radon levels in Perry County, INEPA zone 2
23.1%at or above 4 pCi/L
Median 2.3 pCi/L · 26 tests
- Radon levels in Warrick County, INEPA zone 2
20.9%at or above 4 pCi/L
Median 1.8 pCi/L · 561 tests
- Radon levels in Daviess County, KYEPA zone 2
20.0%at or above 4 pCi/L
Median 1.8 pCi/L · 145 tests
- Radon levels in Hancock County, KYEPA zone 2
16.7%at or above 4 pCi/L
Median 1.4 pCi/L · 6 tests
Spencer County, Cities and towns
Cities and towns in Spencer County
The Census Bureau estimates 20,061 residents in Spencer County for July 1, 2025, 230 more than in 2020 (+1.2%). That works out to 51 people per square mile of land. No town dominates: Santa Claus, the largest, has 2,641 residents, 13.2% of the total. Together its 7 incorporated places hold 39.7% of those residents; the other 60.3% live outside any of them. Reported testing is thin here: 25 tests over 2008 to 2017, or 1.2 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.
From Santa Claus to Gentryville, CDC publishes no figure by town: each reads Spencer County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Santa Claus | 2,641 | +1.9% | 13.2% |
| Rockport | 1,966 | −0.8% | 9.8% |
| Dale | 1,517 | −1.6% | 7.6% |
| Grandview | 699 | Level | 3.5% |
| Chrisney | 468 | +0.6% | 2.3% |
| Richland | 415 | +2.5% | 2.1% |
| Gentryville | 254 | +5.4% | 1.3% |
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).
Spencer County, Homes
Homes in Spencer County
Spencer County is a place of houses on their own lots: 81% of its 8,685 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1979, close to Indiana's 1976: 26% date from before 1960 and 19% from 2000 or later. Owners live in 81% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.
| Homes | Spencer County | Indiana |
|---|---|---|
| Housing units | 8,685 | 2,953,344 |
| Detached houses | 81% | 73% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 10% | 4% |
| Built before 1960 | 26% | 32% |
| Built since 2000 | 19% | 21% |
| Middle year built | 1979 | 1976 |
| Owner-occupied | 81% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.