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Indiana Radon Map and Levels by County

Indiana's counties span EPA Zones 1 and 2. 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

    38.9%

    3.1 pts above U.S.

    Indiana
    38.9%
    U.S.
    35.7%

    43,148 tests across 92 counties, 2008 to 2017

  • Rank among states

    16 of 47

    Middle of the states

    Indiana
    38.9%
    North Dakota
    59.3%

    By share, every state pooled the same way, 2008 to 2017

  • Counties in EPA Zone 1

    57 of 92

    Most at highest potential

    Zone 1
    57
    Zone 2
    35

    Most counties sit in Zone 1; Zone 1 is the highest potential

  • Highest county

    63.3%

    Miami County

    Miami
    63.3%
    Jasper
    14.1%

    Counties with 30+ tests, 2008 to 2017

Read a result for Indiana

Starts at EPA's action level

4.0pCi/L

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

EPA’s reading of 4.0 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. 38.9% of Indiana's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Indiana, At a glance

Indiana at a glance

Predicted: EPA radon zone

92 of 92 counties classified

EPA classifies counties, not states. Of the 92 counties in Indiana with a zone, 57 are in Zone 1 and 35 in Zone 2.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L57 of 92 counties · 62.0%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L35 of 92 counties · 38.0%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Indiana's radon test figures by county: 92 of its 92 counties have one. Each one's share is in the county list.

How to read these figures

Indiana, Compared

Indiana radon figures, compared

Calculated by Radon411
Indiana, 2008 to 2017, laboratory
38.9%
of 43,148 tests at or above 4 pCi/L, pooled
Against the U.S.
+3.1points
35.7% pooled
Rank among the states
16 of 47
1 is the highest share
Counties with 30 or more tests
69
Highest
63.3%
Miami County
Lowest
14.1%
Jasper County

Indiana pools to 38.9%: that share of 43,148 reported tests from 92 counties over the 2008 to 2017 laboratory totals reached EPA's action level. Nationally the pooled share is 35.7%: 3.1 points lower than here.

Among 47 states pooled the same way it ranks 16th, with Idaho (41.5%) above it and Maine (37.6%) below. Miami County reports the highest share (63.3% of 30 tests) and Jasper County the lowest (14.1%); the most tests came from St. Joseph County, 7,346 of them at 29.3%.

Across its 4 overlapping ten-year totals, the share went from 39.3% (2005 to 2014) to 38.9% (2008 to 2017), within 2 points, with 2006 to 2015 the highest at 39.6%. By band, 17 counties at 50% or more, 44 counties at 30% to 50%, 7 counties at 15% to 30%, 1 county at 5% to 15%.

EPA's 1993 map puts 57 of its 92 classified counties in Zone 1; the tests reported since bear that out at 38.9%.

Indiana ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2008 to 2017, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Minnesota11 of 4787130,91243.4%
Illinois12 of 47102108,90943.1%
Utah13 of 472828,34241.9%
Pennsylvania14 of 4767203,04541.7%
Idaho15 of 474412,96141.5%
Indiana16 of 479243,14838.9%
Maine17 of 471611,82537.6%
West Virginia18 of 475510,06137.5%
New Hampshire19 of 471015,60835.0%
Tennessee20 of 479531,06633.3%
Missouri21 of 4711558,52530.6%
Indiana's highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/L
Miami County1 of 693063.3%
Harrison County2 of 6922162.4%
Benton County3 of 693461.8%
Carroll County4 of 693860.5%
Wabash County5 of 699159.3%
Grant County6 of 697958.2%
LaPorte County7 of 6979258.2%
DeKalb County8 of 6924256.6%
Wayne County9 of 6914056.4%
Steuben County10 of 6914055.7%
Jasper County69 of 697114.1%
Warrick County68 of 6956120.9%
Lake County67 of 691,19823.5%
Vanderburgh County66 of 691,50524.4%
Brown County65 of 6911225.9%
Indiana's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2008 to 2017, laboratory
ShareCountiesTheir testsFor example
50% or more173,801Miami County, Harrison County, Benton County
30% to 50%4428,005Tipton County, Howard County, Madison County
15% to 30%710,860St. Joseph County, Franklin County, Jackson County
5% to 15%171Jasper County
Under 5%00None
Indiana ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 20179243,14838.9%35.7%−0.3 points
2007 to 20169239,85239.2%35.8%−0.4 points
2006 to 20159236,34539.6%36.3%+0.3 points
2005 to 20149233,02639.3%36.0%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

Indiana, Counties

Indiana counties by EPA zone

Predicted

All 92 counties, grouped by the zone EPA predicts and ordered by their reported share at or above 4 pCi/L, under Indiana's map. Each county has a page of its own.

Indiana radon map by county: EPA radon zones. Map of Indiana's 92 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber. 57 in Zone 1, 35 in Zone 2, 0 in Zone 3.
Indiana radon map by countyEPA radon zones for Indiana's counties: 57 counties in Zone 1, 35 counties in Zone 2, 0 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in Indiana, 2008 to 2017

Zone 1: highest predicted potential57

Local help

Indiana, Local resources

Local resources in Indiana

Who to ask in Indiana: its radon program, test kits and professionals.

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

Indiana, Questions

Questions about radon in Indiana

Is radon a problem in Indiana?

Of the 92 counties in Indiana that EPA's Map of Radon Zones classifies, 57 carry Zone 1 (the highest predicted potential), 35 Zone 2 and 0 Zone 3. Pooled from 92 counties, 38.9% of the 43,148 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 16th of 47 states.

Who does radon mitigation in Indiana?

17 radon businesses are listed for Indiana, for testing, mitigation or both; each listing names the licensing list it was read from.

Which Indiana counties are in EPA radon Zone 1?

Zone 1 holds 57 counties in Indiana; the first 8 by name are Adams County, Allen County, Bartholomew County, Benton County, Blackford County, Boone County, Carroll County, Cass County, the rest in the county table on this page.

Which Indiana counties have the highest radon?

Miami County 63.3% (30 tests) leads Indiana by the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory, then Harrison County 62.4% (221 tests), Benton County 61.8% (34 tests), Carroll County 60.5% (38 tests), Wabash County 59.3% (91 tests).

Which EPA region is Indiana in?

Indiana is in EPA Region 5: Great Lakes.

Products

Indiana, Products

Testing a home in Indiana

38.9% of the 43,148 tests reported to CDC for Indiana over the 2008 to 2017 laboratory totals reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Indiana; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Indiana homes, compared

Explore

Cities in Indiana with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.