Skip to content
RADON411

Locations and reports

Radon Levels in Elkhart County, Indiana

EPA puts Elkhart County in Zone 1, its highest radon zone, and high results are common there: 46.4% of the 2,856 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    46.4%

    7.5 pts above IN

    Elkhart
    46.4%
    Indiana
    38.9%

    2,856 tests, 2008 to 2017

  • Median result

    3.7pCi/L

    Below action level

    Elkhart
    3.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    2,856

    5th of 69 by tests

    Elkhart
    2,856
    St. Joseph
    7,346

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Indiana

    27 of 69

    Middle half

    Elkhart
    46.4%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Elkhart County

Starts at Elkhart County's median, 3.7 pCi/L

3.7pCi/L

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

EPA’s reading of 3.7 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. Elkhart County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Elkhart County, At a glance

Elkhart County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Elkhart County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

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 Elkhart County, 2008 to 2017, laboratory

Reported results by concentration band, Elkhart County, 2008 to 2017, laboratory
Under 2 pCi/L: 24%2 to 4 pCi/L: 30%4 pCi/L and above: 46%

Of 2,856 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Elkhart County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L68023.8%
2 to 4 pCi/L85229.8%
4 pCi/L and above1,32446.4%
What these figures count

These are the 2,856 tests reported to CDC for Elkhart 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

Elkhart County, Compared

Elkhart County radon figures, compared

Calculated by Radon411

In Elkhart County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (1,324 of 2,856) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 10.7 points higher. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Elkhart County runs 7.5 points above its state.

Of 7 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 5 a smaller one; the spread is 29.3% (St. Joseph County) to 52.9% (Noble County). By share, Elkhart County is 27th of 69 Indiana counties with 30 or more tests for the same period.

Half the tests came in under 3.7 pCi/L and half over it; the single highest reached 268.2 pCi/L. Below the action level, 680 tests (23.8%) came in under 2 pCi/L, against 32.8% statewide, and 852 tests (29.8%) fell between 2 and 4, against 28.3% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 46.4% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 116 tests taken after mitigation in Elkhart County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Elkhart County went from 1,686 tests (2005 to 2014) to 2,856 (2008 to 2017), the share going from 48.2% to 46.4%.

Elkhart County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Elkhart County
Elkhart County2,85646.4%3.7 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled−7.5 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−10.7 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+16.9 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−32.3 points
Noble County, INborders it13652.9%4.3 pCi/L+6.5 points
Kosciusko County, INborders it1,24850.6%4.0 pCi/L+4.2 points
LaGrange County, INborders it12041.7%3.4 pCi/L−4.7 points
Marshall County, INborders it38339.7%3.2 pCi/L−6.7 points
St. Joseph County, MIborders it1,06834.1%2.9 pCi/L−12.3 points
Cass County, MIborders it57230.4%2.6 pCi/L−16.0 points
St. Joseph County, INborders it7,34629.3%2.7 pCi/L−17.1 points
Where Elkhart County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultElkhart County testsElkhart County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L68023.8%32.8%39.6%−9.0 points
2 to 4 pCi/L85229.8%28.3%24.7%+1.5 points
4 pCi/L and above1,32446.4%38.9%35.7%+7.5 points
Elkhart 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
Adams County22 of 696648.5%3.8 pCi/L
Wells County23 of 6916147.8%3.6 pCi/L
Clark County24 of 6951247.7%3.6 pCi/L
Porter County25 of 691,13646.5%3.5 pCi/L
Fulton County26 of 699746.4%3.3 pCi/L
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
Elkhart County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 20172,85646.4%3.7 pCi/L268.2 pCi/L38.9%−0.4 points
2007 to 20162,49546.8%3.7 pCi/L268.2 pCi/L39.2%−0.7 points
2006 to 20152,08047.5%3.8 pCi/L268.2 pCi/L39.6%−0.7 points
2005 to 20141,68648.2%3.8 pCi/L268.2 pCi/L39.3%First on file

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

Elkhart County, Geology

The ground under Elkhart County

Predicted

USGS's geologic map puts all of Elkhart County's mapped land in one class: high radon potential. All of it lies in the area the map calls Saginaw Lobe, to which USGS gives a radon index of 12, in the high band (12 to 17).

USGS's geologic areas under Elkhart County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Saginaw LobeClayey and loamy glacial deposits.High12100%

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

Elkhart County beside the ground around it

Elkhart County has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%. Of the 7 counties that border it, none has as large a share of high-potential ground; Kosciusko County comes nearest at 100%.

Share of land by USGS radon potential: Elkhart County, the 7 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Elkhart CountyZone 1NoneNone100%
Cass County, MIZone 134.5%None65.5%
St. Joseph CountyZone 1None43.3%56.7%
LaGrange CountyZone 1NoneNone100%
St. Joseph County, MIZone 1NoneNone100%
Kosciusko CountyZone 1NoneNone100%
Noble CountyZone 1NoneNone100%
Marshall CountyZone 1None12.3%87.7%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

Elkhart County, Local resources

Radon testing and mitigation in Elkhart 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

Elkhart County, Questions

Questions about radon in Elkhart County

Are radon levels high in Elkhart County?

Over the 2008 to 2017 laboratory totals, 46.4% of the radon tests reported to CDC for Elkhart County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.7 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 26 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Elkhart County?

Elkhart County borders 7 counties: Cass County, MI, St. Joseph County, IN, LaGrange County, IN, St. Joseph County, MI, Kosciusko County, IN, Noble County, IN and Marshall County, IN.

Products

Elkhart County, Products

Testing a home in Elkhart County

In Elkhart County, 46.4% of 2,856 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 Elkhart 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

Elkhart County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Elkhart County

Explore

Elkhart County, Bordering counties

Counties bordering Elkhart County

Calculated by Radon411

Elkhart County, Cities and towns

Cities and towns in Elkhart County

The Census Bureau estimates 208,774 residents in Elkhart County for July 1, 2025, 1,789 more than in 2020 (+0.9%). That works out to 451 people per square mile of land. Its largest town, Elkhart, has 54,092 residents, 25.9% of the total. Testing is reported here more often than across the state: CDC's 2,856 reported tests for 2008 to 2017 come to 13.7 for every 1,000 residents (2025 estimate), against 6.2 for Indiana.

From Elkhart to Millersburg, CDC publishes no figure by town: each reads Elkhart County's.

The cities and towns in Elkhart County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Elkhart54,092+0.4%25.9%
Goshen34,525+0.1%16.5%
Nappaneeextends beyond Elkhart County6,885−0.8%Counted whole
Middlebury3,752+1.7%1.8%
Syracuseextends beyond Elkhart County3,238+0.1%Counted whole
Wakarusa2,005+0.6%1.0%
Bristol1,818+1.2%0.9%
Millersburg971+0.8%0.5%

8 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 Elkhart County is counted whole, so it has no share.

Elkhart County, Homes

Homes in Elkhart County

Of Elkhart County's 80,102 homes, 70% are detached houses, against 73% across Indiana; 13% are in buildings of five or more homes. Half of its homes were built before 1977, close to Indiana's 1976: 30% date from before 1960 and 18% from 2000 or later. 71% 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 Elkhart County, Indiana, 2019 to 2023
HomesElkhart CountyIndiana
Housing units80,1022,953,344
Detached houses70%73%
In buildings of 5 or more13%13%
Mobile homes9%4%
Built before 196030%32%
Built since 200018%21%
Middle year built19771976
Owner-occupied71%70%

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