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Radon Levels in Noble County, Indiana

EPA puts Noble County in Zone 1, its highest radon zone, and high results are common there: 52.9% of the 136 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

    52.9%

    14.0 pts above IN

    Noble
    52.9%
    Indiana
    38.9%

    136 tests, 2008 to 2017

  • Median result

    4.3pCi/L

    Action level reached

    Noble
    4.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    136

    37th of 69 by tests

    Noble
    136
    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

    13 of 69

    Top quarter

    Noble
    52.9%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Noble County

Starts at Noble County's median, 4.3 pCi/L

4.3pCi/L

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

EPA’s reading of 4.3 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. Noble County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Noble County, At a glance

Noble County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

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

Reported results by concentration band, Noble County, 2008 to 2017, laboratory
Under 2 pCi/L: 21%2 to 4 pCi/L: 26%4 pCi/L and above: 53%

Of 136 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Noble County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L2921.3%
2 to 4 pCi/L3525.7%
4 pCi/L and above7252.9%
What these figures count

These are the 136 tests reported to CDC for Noble 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

Noble County, Compared

Noble County radon figures, compared

Calculated by Radon411

More than half: 52.9% of the 136 radon tests reported to CDC for Noble County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 13th of 69 Indiana counties with 30 or more tests for the same period. That is 14.0 points above the 38.9% pooled from 92 Indiana counties.

The median result, 4.3 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 204.7 pCi/L. The rest split 21.3% under 2 pCi/L and 25.7% from 2 to 4 (Indiana: 32.8% and 28.3%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 52.9% share point the same way here.

2 of its 7 bordering counties with figures ran higher, led by DeKalb County at 56.6%; LaGrange County reported 41.7%. 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 Noble County went from 78 tests (2005 to 2014) to 136 (2008 to 2017), the share going from 57.7% to 52.9%.

Nationally, every county with a figure for the same period pools to 35.7%; Noble County sits 17.2 points above it. CDC also counts 21 tests taken after mitigation in Noble County for the same period: tests in homes where a fix was already in.

Noble County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Noble County
Noble County13652.9%4.3 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled−14.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−17.2 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+10.4 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−38.8 points
DeKalb County, INborders it24256.6%4.4 pCi/L+3.7 points
Steuben County, INborders it14055.7%4.5 pCi/L+2.8 points
Whitley County, INborders it18451.6%4.0 pCi/L−1.3 points
Kosciusko County, INborders it1,24850.6%4.0 pCi/L−2.3 points
Elkhart County, INborders it2,85646.4%3.7 pCi/L−6.5 points
Allen County, INborders it3,99041.8%3.3 pCi/L−11.1 points
LaGrange County, INborders it12041.7%3.4 pCi/L−11.2 points
Where Noble County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultNoble County testsNoble County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L2921.3%32.8%39.6%−11.5 points
2 to 4 pCi/L3525.7%28.3%24.7%−2.6 points
4 pCi/L and above7252.9%38.9%35.7%+14.0 points
Noble 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
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
Noble County13 of 6913652.9%4.3 pCi/L
Whitley County14 of 6918451.6%4.0 pCi/L
Kosciusko County15 of 691,24850.6%4.0 pCi/L
Henry County16 of 699550.5%4.0 pCi/L
Shelby County17 of 698450.0%4.0 pCi/L
Tipton County18 of 696949.3%3.9 pCi/L
Noble County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 201713652.9%4.3 pCi/L204.7 pCi/L38.9%+0.3 points
2007 to 201611452.6%4.3 pCi/L204.7 pCi/L39.2%−3.4 points
2006 to 201510056.0%4.6 pCi/L204.7 pCi/L39.6%−1.7 points
2005 to 20147857.7%4.6 pCi/L204.7 pCi/L39.3%First on file

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

Noble County, Geology

The ground under Noble County

Predicted

USGS's geologic map puts all of Noble County's mapped land in one class: high radon potential. The map puts 50.2% of Noble County in the area it calls Huron-Erie Lobe and 49.8% in Saginaw Lobe. USGS gives the first a radon index of 13 and the second 12, both in the high band (12 to 17).

USGS's geologic areas under Noble 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.High1350.2%
Saginaw LobeClayey and loamy glacial deposits.High1249.8%

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

Noble County beside the ground around it

Noble 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; Elkhart County comes nearest at 100%.

Share of land by USGS radon potential: Noble County, the 7 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Noble CountyZone 1NoneNone100%
Whitley CountyZone 1NoneNone100%
LaGrange CountyZone 1NoneNone100%
DeKalb CountyZone 1NoneNone100%
Kosciusko CountyZone 1NoneNone100%
Allen CountyZone 1NoneNone100%
Steuben CountyZone 1NoneNone100%
Elkhart CountyZone 1NoneNone100%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

Noble County, Local resources

Radon testing and mitigation in Noble 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

Noble County, Questions

Questions about radon in Noble County

Are radon levels high in Noble County?

Over the 2008 to 2017 laboratory totals, 52.9% of the radon tests reported to CDC for Noble County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.3 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 12 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Noble County?

Noble County borders 7 counties: Whitley County, LaGrange County, DeKalb County, Kosciusko County, Allen County, Steuben County and Elkhart County.

Products

Noble County, Products

Testing a home in Noble County

In Noble County, 52.9% of 136 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 Noble 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

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

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Noble County, Bordering counties

Counties bordering Noble County

Calculated by Radon411

Noble County, Cities and towns

Cities and towns in Noble County

The Census Bureau estimates 47,937 residents in Noble County for July 1, 2025, 472 more than in 2020 (+1.0%). That works out to 117 people per square mile of land. Its largest town, Kendallville, has 10,371 residents, 21.6% of the total. Reported testing is thin here: 136 tests over 2008 to 2017, or 2.8 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.

From Kendallville to Cromwell, CDC publishes no figure by town: each reads Noble County's.

The cities and towns in Noble County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Kendallville10,371+1.1%21.6%
Ligonier4,710+1.9%9.8%
Avilla2,487+1.7%5.2%
Albion2,261+1.8%4.7%
Rome City1,317+0.4%2.7%
Wolcottvilleextends beyond Noble County1,052+2.7%Counted whole
Cromwell484+0.2%1.0%

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

Noble County, Homes

Homes in Noble County

Noble County is a place of houses on their own lots: 78% of its 20,212 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1975, close to Indiana's 1976: 38% date from before 1960 and 19% from 2000 or later. Owners live in 76% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.

Homes in Noble County, Indiana, 2019 to 2023
HomesNoble CountyIndiana
Housing units20,2122,953,344
Detached houses78%73%
In buildings of 5 or more8%13%
Mobile homes7%4%
Built before 196038%32%
Built since 200019%21%
Middle year built19751976
Owner-occupied76%70%

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