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Radon Levels in LaGrange County, Indiana

EPA puts LaGrange County in Zone 1, its highest radon zone, and high results are common there: 41.7% of the 120 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

    41.7%

    2.8 pts above IN

    LaGrange
    41.7%
    Indiana
    38.9%

    120 tests, 2008 to 2017

  • Median result

    3.4pCi/L

    Below action level

    LaGrange
    3.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    120

    41st of 69 by tests

    LaGrange
    120
    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

    39 of 69

    Middle half

    LaGrange
    41.7%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for LaGrange County

Starts at LaGrange County's median, 3.4 pCi/L

3.4pCi/L

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

EPA’s reading of 3.4 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. LaGrange County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

LaGrange County, At a glance

LaGrange County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of LaGrange 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 LaGrange County, 2008 to 2017, laboratory

Reported results by concentration band, LaGrange County, 2008 to 2017, laboratory
Under 2 pCi/L: 29%2 to 4 pCi/L: 29%4 pCi/L and above: 42%

Of 120 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, LaGrange County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L3529.2%
2 to 4 pCi/L3529.2%
4 pCi/L and above5041.7%
What these figures count

These are the 120 tests reported to CDC for LaGrange 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

LaGrange County, Compared

LaGrange County radon figures, compared

Calculated by Radon411

In LaGrange County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (50 of 120) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 6.0 points higher. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so LaGrange County runs 2.8 points above its state.

Of 6 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 34.1% (St. Joseph County, MI) to 56.6% (DeKalb County). By share, LaGrange County is 39th of 69 Indiana counties with 30 or more tests for the same period.

Half the tests came in under 3.4 pCi/L and half over it; the single highest reached 38.7 pCi/L. Below the action level, 35 tests (29.2%) came in under 2 pCi/L, against 32.8% statewide, and 35 tests (29.2%) fell between 2 and 4, against 28.3% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 41.7% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 12 tests taken after mitigation in LaGrange County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for LaGrange County went from 63 tests (2005 to 2014) to 120 (2008 to 2017), the share going from 41.3% to 41.7%.

LaGrange County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from LaGrange County
LaGrange County12041.7%3.4 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled−2.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−6.0 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+21.6 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−27.6 points
DeKalb County, INborders it24256.6%4.4 pCi/L+14.9 points
Steuben County, INborders it14055.7%4.5 pCi/L+14.0 points
Branch County, MIborders it1,04855.4%4.4 pCi/L+13.7 points
Noble County, INborders it13652.9%4.3 pCi/L+11.2 points
Elkhart County, INborders it2,85646.4%3.7 pCi/L+4.7 points
St. Joseph County, MIborders it1,06834.1%2.9 pCi/L−7.6 points
Where LaGrange County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultLaGrange County testsLaGrange County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L3529.2%32.8%39.6%−3.6 points
2 to 4 pCi/L3529.2%28.3%24.7%+0.9 points
4 pCi/L and above5041.7%38.9%35.7%+2.8 points
LaGrange 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
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
Allen County38 of 693,99041.8%3.3 pCi/L
LaGrange County39 of 6912041.7%3.4 pCi/L
Hendricks County40 of 691,17041.5%3.2 pCi/L
Montgomery County41 of 6915241.4%2.9 pCi/L
Marion County42 of 693,66840.1%3.1 pCi/L
Boone County43 of 6961439.7%3.0 pCi/L
Marshall County44 of 6938339.7%3.2 pCi/L
LaGrange County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 201712041.7%3.4 pCi/L38.7 pCi/L38.9%−3.9 points
2007 to 201610345.6%3.6 pCi/L38.7 pCi/L39.2%+2.6 points
2006 to 20157943.0%3.4 pCi/L38.7 pCi/L39.6%+1.7 points
2005 to 20146341.3%3.3 pCi/L38.7 pCi/L39.3%First on file

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

LaGrange County, Geology

The ground under LaGrange County

Predicted

USGS's geologic map puts all of LaGrange 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 LaGrange 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.

LaGrange County beside the ground around it

LaGrange County has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%. Of the 6 counties that border it, none has as large a share of high-potential ground; Branch County, MI comes nearest at 100%.

Share of land by USGS radon potential: LaGrange County, the 6 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
LaGrange CountyZone 1NoneNone100%
Noble CountyZone 1NoneNone100%
St. Joseph County, MIZone 1NoneNone100%
Steuben CountyZone 1NoneNone100%
Elkhart CountyZone 1NoneNone100%
Branch County, MIZone 1NoneNone100%
DeKalb CountyZone 1NoneNone100%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

LaGrange County, Local resources

Radon testing and mitigation in LaGrange 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

LaGrange County, Questions

Questions about radon in LaGrange County

Are radon levels high in LaGrange County?

Over the 2008 to 2017 laboratory totals, 41.7% of the radon tests reported to CDC for LaGrange County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.4 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 38 reported a higher share; pooled, the state comes to 38.9%.

Which counties border LaGrange County?

LaGrange County borders 6 counties: Noble County, IN, St. Joseph County, MI, Steuben County, IN, Elkhart County, IN, Branch County, MI and DeKalb County, IN.

Products

LaGrange County, Products

Testing a home in LaGrange County

In LaGrange County, 41.7% of 120 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 LaGrange 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

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

Explore

LaGrange County, Bordering counties

Counties bordering LaGrange County

Calculated by Radon411

LaGrange County, Cities and towns

Cities and towns in LaGrange County

The Census Bureau estimates 41,305 residents in LaGrange County for July 1, 2025, 768 more than in 2020 (+1.9%). That works out to 109 people per square mile of land. No town dominates: Lagrange, the largest, has 2,769 residents, 6.7% of the total. Reported testing is thin here: 120 tests over 2008 to 2017, or 2.9 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.

From Lagrange to Shipshewana, CDC publishes no figure by town: each reads LaGrange County's.

The cities and towns in LaGrange County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Lagrange2,769+2.0%6.7%
Topeka1,229+1.6%3.0%
Wolcottvilleextends beyond LaGrange County1,052+2.7%Counted whole
Shipshewana855+1.5%2.1%

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). A place that extends beyond LaGrange County is counted whole, so it has no share.

LaGrange County, Homes

Homes in LaGrange County

LaGrange County is a place of houses on their own lots: 82% of its 15,023 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1982, close to Indiana's 1976: 29% date from before 1960 and 25% from 2000 or later. Owners live in 82% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.

Homes in LaGrange County, Indiana, 2019 to 2023
HomesLaGrange CountyIndiana
Housing units15,0232,953,344
Detached houses82%73%
In buildings of 5 or more3%13%
Mobile homes8%4%
Built before 196029%32%
Built since 200025%21%
Middle year built19821976
Owner-occupied82%70%

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