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Radon Levels in Vigo County, Indiana

EPA puts Vigo County in Zone 2, its middle radon zone, and high results are common there: 44.0% of the 455 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

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  • Share at 4+ pCi/L

    44.0%

    5.1 pts above IN

    Vigo
    44.0%
    Indiana
    38.9%

    455 tests, 2008 to 2017

  • Median result

    3.6pCi/L

    Below action level

    Vigo
    3.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    455

    19th of 69 by tests

    Vigo
    455
    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

    32 of 69

    Middle half

    Vigo
    44.0%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Vigo County

Starts at Vigo County's median, 3.6 pCi/L

3.6pCi/L

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

EPA’s reading of 3.6 pCi/L

Between 2 and 4 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Vigo County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Vigo County, At a glance

Vigo County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Vigo 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 86% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Vigo County, 2008 to 2017, laboratory

Reported results by concentration band, Vigo County, 2008 to 2017, laboratory
Under 2 pCi/L: 30%2 to 4 pCi/L: 26%4 pCi/L and above: 44%

Of 455 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Vigo County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L13830.3%
2 to 4 pCi/L11725.7%
4 pCi/L and above20044.0%
What these figures count

These are the 455 tests reported to CDC for Vigo 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

Vigo County, Compared

Vigo County radon figures, compared

Calculated by Radon411

In Vigo County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (200 of 455) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 8.3 points higher. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Vigo County runs 5.1 points above its state.

Of 2 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 22.1% (Clark County, IL) to 37.9% (Edgar County, IL). By share, Vigo County is 32nd of 69 Indiana counties with 30 or more tests for the same period.

Half the tests came in under 3.6 pCi/L and half over it; the single highest reached 58.7 pCi/L. Below the action level, 138 tests (30.3%) came in under 2 pCi/L, against 32.8% statewide, and 117 tests (25.7%) fell between 2 and 4, against 28.3% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 44.0% share point the same way here. USGS geology rates 86% of the county's land moderate radon potential. CDC also counts 44 tests taken after mitigation in Vigo County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Vigo County went from 377 tests (2005 to 2014) to 455 (2008 to 2017), the share going from 41.6% to 44.0%.

Vigo County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Vigo County
Vigo County45544.0%3.6 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled−5.1 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−8.3 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+19.3 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−29.9 points
Parke County, INborders it2568.0%4.8 pCi/L+24.0 points
Sullivan County, INborders it1346.2%3.1 pCi/L+2.2 points
Vermillion County, INborders it2441.7%3.3 pCi/L−2.3 points
Edgar County, ILborders it11637.9%3.2 pCi/L−6.1 points
Clay County, INborders it2326.1%2.9 pCi/L−17.9 points
Clark County, ILborders it7722.1%2.0 pCi/L−21.9 points
Where Vigo County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultVigo County testsVigo County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L13830.3%32.8%39.6%−2.5 points
2 to 4 pCi/L11725.7%28.3%24.7%−2.6 points
4 pCi/L and above20044.0%38.9%35.7%+5.1 points
Vigo 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
Elkhart County27 of 692,85646.4%3.7 pCi/L
Clinton County28 of 698545.9%3.5 pCi/L
Jefferson County29 of 697245.8%3.1 pCi/L
Morgan County30 of 6922644.2%3.5 pCi/L
Dubois County31 of 6913644.1%3.7 pCi/L
Vigo County32 of 6945544.0%3.6 pCi/L
Huntington County33 of 6916943.8%3.5 pCi/L
Gibson County34 of 6912043.3%3.4 pCi/L
Knox County35 of 695843.1%3.4 pCi/L
Floyd County36 of 6931642.4%3.3 pCi/L
Washington County37 of 693842.1%3.5 pCi/L
Vigo County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 201745544.0%3.6 pCi/L58.7 pCi/L38.9%+1.9 points
2007 to 201644742.1%3.4 pCi/L58.7 pCi/L39.2%−0.3 points
2006 to 201542542.4%3.3 pCi/L102.5 pCi/L39.6%+0.8 points
2005 to 201437741.6%3.2 pCi/L102.5 pCi/L39.3%First on file

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

Vigo County, Geology

The ground under Vigo County

Predicted

Most of the ground under Vigo County is one class on USGS's geologic map: 86.2% of its land is moderate radon potential, with 13.8% high. The map puts 86.0% of Vigo County in the area it calls Wabash Lowland and 13.7% in Huron-Erie Lobe. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).

USGS's geologic areas under Vigo County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Wabash LowlandLoess, pre-Wisconsinan glacial deposits, Pennsylvanian shale, sandstone, and carbonate bedrock.Moderate1086.0%
Huron-Erie LobeCalcareous clayey and loamy glacial deposits derived from marine carbonate and clastic sedimentary rocks.High1313.7%

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

Vigo County beside the ground around it

Indiana as a whole has more high-potential ground than Vigo County: 56.6% of its land, against 13.8% here. Of the 6 counties that border it, 3 have more high-potential ground, Vermillion County the most at 99.0%.

Share of land by USGS radon potential: Vigo County, the 6 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Vigo CountyZone 2None86.2%13.8%
Clay CountyZone 2None100%None
Sullivan CountyZone 2None100%None
Clark County, ILZone 2None96.5%3.5%
Parke CountyZone 2None72.8%27.2%
Edgar County, ILZone 1None5.1%94.9%
Vermillion CountyZone 1None1.0%99.0%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

Vigo County, Local resources

Radon testing and mitigation in Vigo 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

Vigo County, Questions

Questions about radon in Vigo County

Are radon levels high in Vigo County?

Over the 2008 to 2017 laboratory totals, 44.0% of the radon tests reported to CDC for Vigo County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.6 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 31 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Vigo County?

Vigo County borders 6 counties: Clay County, IN, Sullivan County, IN, Clark County, IL, Parke County, IN, Edgar County, IL and Vermillion County, IN.

Products

Vigo County, Products

Testing a home in Vigo County

In Vigo County, 44.0% of 455 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 Vigo County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Vigo County homes, compared

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Vigo County, Bordering counties

Counties bordering Vigo County

Calculated by Radon411

Vigo County, Cities and towns

Cities and towns in Vigo County

Vigo County's population has barely moved since 2020: 106,512 residents on July 1, 2025 against 106,143 then, by the Census Bureau's estimates. That works out to 264 people per square mile of land. Terre Haute alone is home to 58,764 of them, 55.2% of the total. Together its 4 incorporated places hold 58.4% of those residents; the other 41.6% live outside any of them. CDC's 455 reported tests for 2008 to 2017 work out to 4.3 per 1,000 residents (2025 estimate), close to Indiana's 6.2.

From Terre Haute to Riley, CDC publishes no figure by town: each reads Vigo County's.

The cities and towns in Vigo County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Terre Haute58,764+0.6%55.2%
West Terre Haute2,160+0.2%2.0%
Seelyville1,000−0.1%0.9%
Riley238Level0.2%

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).

Vigo County, Homes

Homes in Vigo County

Of Vigo County's 46,937 homes, 71% are detached houses, against 73% across Indiana; 13% are in buildings of five or more homes. The homes are older than Indiana's as a whole: half were built before 1968 (1976 for Indiana), and 42% date from before 1960. 63% of occupied homes are lived in by their owner (Indiana: 70%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Vigo County, Indiana, 2019 to 2023
HomesVigo CountyIndiana
Housing units46,9372,953,344
Detached houses71%73%
In buildings of 5 or more13%13%
Mobile homes2%4%
Built before 196042%32%
Built since 200016%21%
Middle year built19681976
Owner-occupied63%70%

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