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Radon Levels in Morgan County, Indiana

EPA puts Morgan County in Zone 2, its middle radon zone, and high results are common there: 44.2% of the 226 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

    44.2%

    5.3 pts above IN

    Morgan
    44.2%
    Indiana
    38.9%

    226 tests, 2008 to 2017

  • Median result

    3.5pCi/L

    Below action level

    Morgan
    3.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    226

    26th of 69 by tests

    Morgan
    226
    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

    30 of 69

    Middle half

    Morgan
    44.2%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Morgan County

Starts at Morgan County's median, 3.5 pCi/L

3.5pCi/L

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

EPA’s reading of 3.5 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. Morgan County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Morgan County, At a glance

Morgan County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Morgan 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: High across 56% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Morgan County, 2008 to 2017, laboratory
Under 2 pCi/L: 27%2 to 4 pCi/L: 29%4 pCi/L and above: 44%

Of 226 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Morgan County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L6127.0%
2 to 4 pCi/L6528.8%
4 pCi/L and above10044.2%
What these figures count

These are the 226 tests reported to CDC for Morgan 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

Morgan County, Compared

Morgan County radon figures, compared

Calculated by Radon411

In Morgan County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (100 of 226) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 8.5 points higher. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Morgan County runs 5.3 points above its state.

Of 7 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 25.9% (Brown County) to 41.5% (Hendricks County). By share, Morgan County is 30th of 69 Indiana counties with 30 or more tests for the same period.

Half the tests came in under 3.5 pCi/L and half over it; the single highest reached 27.8 pCi/L. Below the action level, 61 tests (27.0%) came in under 2 pCi/L, against 32.8% statewide, and 65 tests (28.8%) 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 44.2% share point the same way here. USGS geology rates 56% of the county's land high radon potential. CDC also counts 37 tests taken after mitigation in Morgan County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Morgan County went from 178 tests (2005 to 2014) to 226 (2008 to 2017), the share going from 41.6% to 44.2%.

Morgan County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Morgan County
Morgan County22644.2%3.5 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled−5.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−8.5 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+19.1 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−30.1 points
Hendricks County, INborders it1,17041.5%3.2 pCi/L−2.7 points
Marion County, INborders it3,66840.1%3.1 pCi/L−4.1 points
Johnson County, INborders it55639.4%2.9 pCi/L−4.8 points
Owen County, INborders it11039.1%2.8 pCi/L−5.1 points
Putnam County, INborders it11934.5%2.7 pCi/L−9.7 points
Monroe County, INborders it2,37534.2%2.8 pCi/L−10.0 points
Brown County, INborders it11225.9%2.8 pCi/L−18.3 points
Where Morgan County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultMorgan County testsMorgan County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L6127.0%32.8%39.6%−5.8 points
2 to 4 pCi/L6528.8%28.3%24.7%+0.5 points
4 pCi/L and above10044.2%38.9%35.7%+5.3 points
Morgan 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
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
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
Morgan County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 201722644.2%3.5 pCi/L27.8 pCi/L38.9%+1.5 points
2007 to 201621342.7%3.5 pCi/L27.8 pCi/L39.2%−1.5 points
2006 to 201519744.2%3.5 pCi/L27.8 pCi/L39.6%+2.6 points
2005 to 201417841.6%3.4 pCi/L27.8 pCi/L39.3%First on file

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

Morgan County, Geology

The ground under Morgan County

Predicted

USGS's geologic map splits Morgan County: 55.6% of its land is high radon potential and 44.4% moderate. The map puts 55.6% of Morgan County in the area it calls Huron-Erie Lobe and 44.4% in Crawford Upland/Mitchell Plain/Norman Upland. USGS gives the first a radon index of 13, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).

USGS's geologic areas under Morgan County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Huron-Erie LobeCalcareous clayey and loamy glacial deposits derived from marine carbonate and clastic sedimentary rocks.High1355.6%
Crawford Upland/Mitchell Plain/Norman UplandUnglaciated, underlain by karsted Mississippian carbonate rocks.Moderate1144.4%

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

Morgan County beside the ground around it

On high-potential ground Morgan County is close to Indiana as a whole: 55.6% of its land against 56.6%. Of the 7 counties that border it, 4 have more high-potential ground, Hendricks County the most at 100%.

Share of land by USGS radon potential: Morgan County, the 7 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Morgan CountyZone 2None44.4%55.6%
Johnson CountyZone 1None0.9%99.1%
Monroe CountyZone 1None100%None
Hendricks CountyZone 1NoneNone100%
Marion CountyZone 1NoneNone100%
Putnam CountyZone 1None30.0%70.0%
Brown CountyZone 2None99.3%0.7%
Owen 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

Morgan County, Local resources

Radon testing and mitigation in Morgan 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

Morgan County, Questions

Questions about radon in Morgan County

Are radon levels high in Morgan County?

Over the 2008 to 2017 laboratory totals, 44.2% of the radon tests reported to CDC for Morgan County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.5 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 29 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Morgan County?

Morgan County borders 7 counties: Johnson County, Monroe County, Hendricks County, Marion County, Putnam County, Brown County and Owen County.

Products

Morgan County, Products

Testing a home in Morgan County

In Morgan County, 44.2% of 226 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 Morgan County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Morgan County homes, compared

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Morgan County, Bordering counties

Counties bordering Morgan County

Calculated by Radon411

Morgan County, Cities and towns

Cities and towns in Morgan County

The Census Bureau estimates 74,967 residents in Morgan County for July 1, 2025, 3,125 more than in 2020 (+4.3%). That works out to 186 people per square mile of land. No town dominates: Martinsville, the largest, has 12,141 residents, 16.2% of the total. Together its 7 incorporated places hold 38.8% of those residents; the other 61.2% live outside any of them. Reported testing is thin here: 226 tests over 2008 to 2017, or 3.0 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.

From Martinsville to Bethany, CDC publishes no figure by town: each reads Morgan County's.

The cities and towns in Morgan County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Martinsville12,141+1.8%16.2%
Mooresville10,173+7.8%13.6%
Brooklyn2,621+4.4%3.5%
Monrovia2,485+47.1%3.3%
Morgantown1,007−1.1%1.3%
Paragon584+4.7%0.8%
Bethany95+1.1%0.1%

7 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).

Morgan County, Homes

Homes in Morgan County

Morgan County is a place of houses on their own lots: 83% of its 29,749 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1980, close to Indiana's 1976: 26% date from before 1960 and 21% from 2000 or later. 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 Morgan County, Indiana, 2019 to 2023
HomesMorgan CountyIndiana
Housing units29,7492,953,344
Detached houses83%73%
In buildings of 5 or more4%13%
Mobile homes6%4%
Built before 196026%32%
Built since 200021%21%
Middle year built19801976
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.