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Radon Levels in Warrick County, Indiana

EPA puts Warrick County in Zone 2, its middle radon zone, and 20.9% of its 561 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

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  • Share at 4+ pCi/L

    20.9%

    18.0 pts below IN

    Warrick
    20.9%
    Indiana
    38.9%

    561 tests, 2008 to 2017

  • Median result

    1.8pCi/L

    Below action level

    Warrick
    1.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    561

    16th of 69 by tests

    Warrick
    561
    St. Joseph
    7,346

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Indiana

    68 of 69

    Lowest quarter

    Warrick
    20.9%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Warrick County

Starts at Warrick County's median, 1.8 pCi/L

1.8pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 1.8 pCi/L

Below 2 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Warrick County's median reported result, 2008 to 2017.

Interpret this reading

The data

Warrick County, At a glance

Warrick County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Warrick County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

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 Warrick County, 2008 to 2017, laboratory

Reported results by concentration band, Warrick County, 2008 to 2017, laboratory
Under 2 pCi/L: 53%2 to 4 pCi/L: 26%4 pCi/L and above: 21%

Of 561 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Warrick County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L29752.9%
2 to 4 pCi/L14726.2%
4 pCi/L and above11720.9%
What these figures count

These are the 561 tests reported to CDC for Warrick 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).

How to read these figures

Warrick County, Compared

Warrick County radon figures, compared

Calculated by Radon411

Warrick County's 561 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.8 pCi/L and a maximum of 19.8 pCi/L, and 20.9% reached 4 pCi/L. Indiana as a whole (92 Indiana counties, pooled) comes to 38.9%: 18.0 points higher than here.

Among its state's counties it ranks 68th of 69 Indiana counties with 30 or more tests for the same period. Statewide for the same period, Miami County reported the highest share (63.3%) and Jasper County the lowest (14.1%).

Below the action level, 297 tests (52.9%) came in under 2 pCi/L, against 32.8% statewide, and 147 tests (26.2%) fell between 2 and 4, against 28.3% statewide. CDC's ten-year totals for Warrick County went from 358 tests (2005 to 2014) to 561 (2008 to 2017), the share going from 23.7% to 20.9%.

EPA's 1993 zone map puts Warrick County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Next door, the shares run from 20.0% in Daviess County, KY to 44.1% in Dubois County, with Daviess County, KY below Warrick County.

CDC also counts 66 tests taken after mitigation in Warrick County for the same period: tests in homes where a fix was already in.

Warrick County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Warrick County
Warrick County56120.9%1.8 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled+18.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+14.8 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+42.4 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−6.8 points
Spencer County, INborders it2560.0%4.5 pCi/L+39.1 points
Pike County, INborders it650.0%3.6 pCi/L+29.1 points
Dubois County, INborders it13644.1%3.7 pCi/L+23.2 points
Gibson County, INborders it12043.3%3.4 pCi/L+22.4 points
Vanderburgh County, INborders it1,50524.4%2.4 pCi/L+3.5 points
Henderson County, KYborders it5424.1%2.3 pCi/L+3.2 points
Daviess County, KYborders it14520.0%1.8 pCi/L−0.9 points
Where Warrick County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultWarrick County testsWarrick County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L29752.9%32.8%39.6%+20.1 points
2 to 4 pCi/L14726.2%28.3%24.7%−2.1 points
4 pCi/L and above11720.9%38.9%35.7%−18.0 points
Warrick County ranked among the 69 Indiana counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Decatur County59 of 696333.3%2.8 pCi/L
Greene County60 of 694932.7%3.0 pCi/L
Dearborn County61 of 6913630.1%2.6 pCi/L
St. Joseph County62 of 697,34629.3%2.7 pCi/L
Franklin County63 of 695028.0%2.1 pCi/L
Jackson County64 of 698827.3%2.8 pCi/L
Brown County65 of 6911225.9%2.8 pCi/L
Vanderburgh County66 of 691,50524.4%2.4 pCi/L
Lake County67 of 691,19823.5%1.8 pCi/L
Warrick County68 of 6956120.9%1.8 pCi/L
Jasper County69 of 697114.1%1.2 pCi/L
Warrick County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 201756120.9%1.8 pCi/L19.8 pCi/L38.9%+0.6 points
2007 to 201649320.3%1.8 pCi/L19.8 pCi/L39.2%−0.9 points
2006 to 201543021.2%1.8 pCi/L19.8 pCi/L39.6%−2.5 points
2005 to 201435823.7%2.1 pCi/L19.8 pCi/L39.3%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Warrick County, Geology

The ground under Warrick County

Predicted

USGS's geologic map puts all of Warrick 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).

USGS's geologic areas under Warrick County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Wabash LowlandLoess, pre-Wisconsinan glacial deposits, Pennsylvanian shale, sandstone, and carbonate bedrock.Moderate1099.9%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Warrick County beside the ground around it

Across Indiana 56.6% of the land is rated high; none of Warrick County's is. Of the 7 counties that border it, none has as large a share of moderate-potential ground; Henderson County, KY comes nearest at 100%.

Share of land by USGS radon potential: Warrick County, the 7 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Warrick CountyZone 2None100%None
Spencer CountyZone 2None100%None
Vanderburgh CountyZone 2None100%None
Pike CountyZone 2None100%None
Gibson CountyZone 2None100%None
Daviess County, KYZone 2None100%None
Henderson County, KYZone 2None100%None
Dubois CountyZone 2None100%None
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

The map rates the ground, not the air in any home.

Local help

Warrick County, Local resources

Radon testing and mitigation in Warrick County

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

Warrick County, Questions

Questions about radon in Warrick County

Are radon levels high in Warrick County?

Over the 2008 to 2017 laboratory totals, 20.9% of the radon tests reported to CDC for Warrick County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 67 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Warrick County?

Warrick County borders 7 counties: Spencer County, IN, Vanderburgh County, IN, Pike County, IN, Gibson County, IN, Daviess County, KY, Henderson County, KY and Dubois County, IN.

Products

Warrick County, Products

Testing a home in Warrick County

In Warrick County, 20.9% of 561 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 38.9% pooled across Indiana. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Warrick County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Warrick County homes, compared

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Warrick County, Bordering counties

Counties bordering Warrick County

Calculated by Radon411

Warrick County, Cities and towns

Cities and towns in Warrick County

The Census Bureau estimates 66,803 residents in Warrick County for July 1, 2025, 2,800 more than in 2020 (+4.4%). That works out to 174 people per square mile of land. No town dominates: Boonville, the largest, has 6,689 residents, 10.0% of the total. Together its 6 incorporated places hold 23.8% of those residents; the other 76.2% live outside any of them. CDC's 561 reported tests for 2008 to 2017 work out to 8.4 per 1,000 residents (2025 estimate), close to Indiana's 6.2.

From Boonville to Tennyson, CDC publishes no figure by town: each reads Warrick County's.

The cities and towns in Warrick County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Boonville6,689−0.1%10.0%
Chandler3,960+7.4%5.9%
Newburgh3,442+3.1%5.2%
Lynnville881+6.4%1.3%
Elberfeld673+4.5%1.0%
Tennyson229+5.5%0.3%

6 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).

Warrick County, Homes

Homes in Warrick County

Warrick County is a place of houses on their own lots: 82% of its 26,567 homes are detached single-family houses, against 73% across Indiana. Much of Warrick County is recent building: 28% of its homes have gone up since 2000 and the middle year built is 1985, against 1976 for Indiana. Owners live in 83% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.

Homes in Warrick County, Indiana, 2019 to 2023
HomesWarrick CountyIndiana
Housing units26,5672,953,344
Detached houses82%73%
In buildings of 5 or more7%13%
Mobile homes4%4%
Built before 196020%32%
Built since 200028%21%
Middle year built19851976
Owner-occupied83%70%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.