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Radon Levels in LaPorte County, Indiana

EPA puts LaPorte County in Zone 2, its middle radon zone, and high results are common there: 58.2% of the 792 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

    58.2%

    19.3 pts above IN

    LaPorte
    58.2%
    Indiana
    38.9%

    792 tests, 2008 to 2017

  • Median result

    5.0pCi/L

    Action level reached

    LaPorte
    5.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    792

    14th of 69 by tests

    LaPorte
    792
    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

    7 of 69

    Top quarter

    LaPorte
    58.2%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for LaPorte County

Starts at LaPorte County's median, 5.0 pCi/L

5.0pCi/L

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

EPA’s reading of 5.0 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. LaPorte County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

LaPorte County, At a glance

LaPorte County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

LaPorte 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 LaPorte County, 2008 to 2017, laboratory

Reported results by concentration band, LaPorte County, 2008 to 2017, laboratory
Under 2 pCi/L: 24%2 to 4 pCi/L: 18%4 pCi/L and above: 58%

Of 792 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, LaPorte County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L19224.2%
2 to 4 pCi/L13917.6%
4 pCi/L and above46158.2%
What these figures count

These are the 792 tests reported to CDC for LaPorte 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

LaPorte County, Compared

LaPorte County radon figures, compared

Calculated by Radon411

More than half: 58.2% of the 792 radon tests reported to CDC for LaPorte County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 7th of 69 Indiana counties with 30 or more tests for the same period. That is 19.3 points above the 38.9% pooled from 92 Indiana counties.

The median result, 5.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 126.3 pCi/L. The rest split 24.2% under 2 pCi/L and 17.6% from 2 to 4 (Indiana: 32.8% and 28.3%). The reported tests do not follow EPA's Zone 2 label for LaPorte County (predicted average between 2 and 4 pCi/L): 58.2% of them reached 4 pCi/L, fewer than that label suggests.

No bordering county with a figure for the same period reported a higher share; the closest is Porter County at 46.5%, the lowest Jasper County at 14.1%. Statewide for the same period, Miami County reported the highest share (63.3%) and Jasper County the lowest (14.1%).

CDC's ten-year totals for LaPorte County went from 586 tests (2005 to 2014) to 792 (2008 to 2017), the share going from 55.1% to 58.2%.

Nationally, every county with a figure for the same period pools to 35.7%; LaPorte County sits 22.5 points above it. CDC also counts 76 tests taken after mitigation in LaPorte County for the same period: tests in homes where a fix was already in.

LaPorte County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from LaPorte County
LaPorte County79258.2%5.0 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled−19.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−22.5 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+5.1 points
Warrick Countylowest in the state56120.9%1.8 pCi/L−37.3 points
Porter County, INborders it1,13646.5%3.5 pCi/L−11.7 points
St. Joseph County, INborders it7,34629.3%2.7 pCi/L−28.9 points
Berrien County, MIborders it1,19224.2%2.0 pCi/L−34.0 points
Jasper County, INborders it7114.1%1.2 pCi/L−44.1 points
Starke County, INborders it244.2%1.6 pCi/L−54.0 points
Where LaPorte County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultLaPorte County testsLaPorte County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L19224.2%32.8%39.6%−8.6 points
2 to 4 pCi/L13917.6%28.3%24.7%−10.7 points
4 pCi/L and above46158.2%38.9%35.7%+19.3 points
LaPorte 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
Harrison County2 of 6922162.4%5.5 pCi/L
Benton County3 of 693461.8%5.7 pCi/L
Carroll County4 of 693860.5%5.8 pCi/L
Wabash County5 of 699159.3%5.8 pCi/L
Grant County6 of 697958.2%4.6 pCi/L
LaPorte County7 of 6979258.2%5.0 pCi/L
DeKalb County8 of 6924256.6%4.4 pCi/L
Wayne County9 of 6914056.4%4.5 pCi/L
Steuben County10 of 6914055.7%4.5 pCi/L
Delaware County11 of 6918755.1%4.2 pCi/L
Fountain County12 of 696055.0%4.6 pCi/L
LaPorte County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 201779258.2%5.0 pCi/L126.3 pCi/L38.9%+0.9 points
2007 to 201672457.3%4.8 pCi/L126.3 pCi/L39.2%+1.4 points
2006 to 201562355.9%4.7 pCi/L126.3 pCi/L39.6%+0.8 points
2005 to 201458655.1%4.6 pCi/L126.3 pCi/L39.3%First on file

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

LaPorte County, Geology

The ground under LaPorte County

Predicted

USGS's geologic map puts all of LaPorte County's mapped land in one class: moderate radon potential. The map puts 72.8% of LaPorte County in the area it calls Kankakee Outwash and Lacustrine Plain and 27.2% in Calumet Lacustrine Plain/Valparaiso Morainal Area. USGS gives the first a radon index of 10 and the second 11, both in the moderate band (9 to 11).

USGS's geologic areas under LaPorte County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Kankakee Outwash and Lacustrine PlainMoraine deposits, outwash and dune sands.Moderate1072.8%
Calumet Lacustrine Plain/Valparaiso Morainal AreaSilty to clayey glacial lake deposits and sand dunes.Moderate1127.2%

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

LaPorte County beside the ground around it

Across Indiana 56.6% of the land is rated high; none of LaPorte County's is. Of the 5 counties that border it, 4 have more high-potential ground, St. Joseph County the most at 56.7%.

Share of land by USGS radon potential: LaPorte County, the 5 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
LaPorte CountyZone 2None100%None
Starke CountyZone 2None98.5%1.5%
Porter CountyZone 2None99.8%None
St. Joseph CountyZone 1None43.3%56.7%
Jasper CountyZone 2None46.0%54.0%
Berrien County, MIZone 399.5%0.3%0.1%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

LaPorte County, Local resources

Radon testing and mitigation in LaPorte 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

LaPorte County, Questions

Questions about radon in LaPorte County

Are radon levels high in LaPorte County?

Over the 2008 to 2017 laboratory totals, 58.2% of the radon tests reported to CDC for LaPorte County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.0 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 6 reported a higher share; pooled, the state comes to 38.9%.

Which counties border LaPorte County?

LaPorte County borders 5 counties: Starke County, IN, Porter County, IN, St. Joseph County, IN, Jasper County, IN and Berrien County, MI.

Products

LaPorte County, Products

Testing a home in LaPorte County

In LaPorte County, 58.2% of 792 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 LaPorte County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for LaPorte County homes, compared

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LaPorte County, Bordering counties

Counties bordering LaPorte County

Calculated by Radon411

LaPorte County, Cities and towns

Cities and towns in LaPorte County

About 111,294 people live in LaPorte County by the Census Bureau's estimate for July 1, 2025, 985 fewer than in 2020 (−0.9%). That works out to 186 people per square mile of land. Its largest town, Michigan City, has 31,338 residents, 28.2% of the total. Together its 11 incorporated places hold 59.5% of those residents; the other 40.5% live outside any of them. CDC's 792 reported tests for 2008 to 2017 work out to 7.1 per 1,000 residents (2025 estimate), close to Indiana's 6.2.

From Michigan City to Kingsbury, CDC publishes no figure by town: each reads LaPorte County's.

The cities and towns in LaPorte County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Michigan City31,338−2.1%28.2%
La Porte22,600+0.1%20.3%
Westville5,387+2.2%4.8%
Trail Creek1,987−3.3%1.8%
Kingsford Heights1,500+12.7%1.3%
Long Beach1,158−2.4%1.0%
Wanatah972−3.3%0.9%
La Crosse556−3.8%0.5%
Michiana Shores303−1.9%0.3%
Pottawattamie Park234−3.7%0.2%
Kingsbury185−3.1%0.2%

11 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).

LaPorte County, Homes

Homes in LaPorte County

LaPorte County is a place of houses on their own lots: 78% of its 49,878 homes are detached single-family houses, against 73% across Indiana. The homes are older than Indiana's as a whole: half were built before 1968 (1976 for Indiana), and 41% date from before 1960. 75% 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 LaPorte County, Indiana, 2019 to 2023
HomesLaPorte CountyIndiana
Housing units49,8782,953,344
Detached houses78%73%
In buildings of 5 or more9%13%
Mobile homes4%4%
Built before 196041%32%
Built since 200014%21%
Middle year built19681976
Owner-occupied75%70%

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