Locations and reports
Radon Levels in Indiana
What this means for you
- Your area: EPA rates 57 of Indiana's 92 classified counties Zone 1, the highest of its three radon zones. Zones are predictions for whole counties, and homes with elevated levels occur in all three zones.
- Local tests: CDC publishes Indiana's radon test results by county. Open your county below to see its figures.
- Your home: The only way to know your home’s level is to test it.
pCi/L (picocuries per liter) is the unit radon is measured in. EPA recommends fixing a home at 4 pCi/L or above, its action level.
For Indiana, EPA's Map of Radon Zones places 57 of its 92 classified counties in Zone 1, highest predicted potential, a prediction for each county as a whole. Radon levels vary from home to home, so only a test measures the level in yours.
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 describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
CDC publishes Indiana's radon test figures by county: 92 of its 92 counties have one. Each county's share is in the county list.
Indiana, In figures
Indiana in figures
What the published data says about Indiana, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places 57 of Indiana's 92 counties in Zone 1 and 35 in Zone 2.
Zone 1 counties, A to Z, begin with Adams County, Allen County and Bartholomew County; the county section below lists all 57.
Compared
Calculated by Radon41162% of Indiana's counties with a zone on file are in Zone 1, a larger share than across all U.S. counties (34%). It is a share of counties, not of land, people or homes.
Reported tests
MeasuredCDC has no statewide testing figure for Indiana on file here.
92 of the 92 counties have a published county figure; the most tests in each one's latest year were reported for St. Joseph County (7,007 in 2017), Allen County (3,264 in 2017) and Marion County (2,993 in 2017).
Local record
Indiana's radon program and its page are under Local resources.
2 cities have a page setting the figures of the counties it lies in side by side: Bloomington and Fort Wayne.
Indiana, Counties
Indiana counties by EPA zone
PredictedAll 92 counties, by the zone EPA predicts for each. Every county has its own report.
Zone 1: highest predicted potential57
- Adams County48.5% of reported tests at or above 4 pCi/L, 2017
- Allen County41.8% of reported tests at or above 4 pCi/L, 2017
- Bartholomew County48.7% of reported tests at or above 4 pCi/L, 2017
- Benton County61.8% of reported tests at or above 4 pCi/L, 2017
- Blackford County36.4% of reported tests at or above 4 pCi/L, 2017
- Boone County39.7% of reported tests at or above 4 pCi/L, 2017
- Carroll County60.5% of reported tests at or above 4 pCi/L, 2017
- Cass County34.1% of reported tests at or above 4 pCi/L, 2017
- Clark County47.7% of reported tests at or above 4 pCi/L, 2017
- Clinton County45.9% of reported tests at or above 4 pCi/L, 2017
- Decatur County33.3% of reported tests at or above 4 pCi/L, 2017
- DeKalb County56.6% of reported tests at or above 4 pCi/L, 2017
- Delaware County55.1% of reported tests at or above 4 pCi/L, 2017
- Elkhart County46.4% of reported tests at or above 4 pCi/L, 2017
- Fayette County76.9% of reported tests at or above 4 pCi/L, 2017
- Fountain County55.0% of reported tests at or above 4 pCi/L, 2017
- Fulton County46.4% of reported tests at or above 4 pCi/L, 2017
- Grant County58.2% of reported tests at or above 4 pCi/L, 2017
- Hamilton County37.6% of reported tests at or above 4 pCi/L, 2017
- Hancock County33.9% of reported tests at or above 4 pCi/L, 2017
- Harrison County62.4% of reported tests at or above 4 pCi/L, 2017
- Hendricks County41.5% of reported tests at or above 4 pCi/L, 2017
- Henry County50.5% of reported tests at or above 4 pCi/L, 2017
- Howard County49.1% of reported tests at or above 4 pCi/L, 2017
- Huntington County43.8% of reported tests at or above 4 pCi/L, 2017
- Jay County44.4% of reported tests at or above 4 pCi/L, 2017
- Jennings County35.1% of reported tests at or above 4 pCi/L, 2017
- Johnson County39.4% of reported tests at or above 4 pCi/L, 2017
- Kosciusko County50.6% of reported tests at or above 4 pCi/L, 2017
- LaGrange County41.7% of reported tests at or above 4 pCi/L, 2017
- Lawrence County35.6% of reported tests at or above 4 pCi/L, 2017
- Madison County49.0% of reported tests at or above 4 pCi/L, 2017
- Marion County40.1% of reported tests at or above 4 pCi/L, 2017
- Marshall County39.7% of reported tests at or above 4 pCi/L, 2017
- Miami County63.3% of reported tests at or above 4 pCi/L, 2017
- Monroe County34.2% of reported tests at or above 4 pCi/L, 2017
- Montgomery County41.4% of reported tests at or above 4 pCi/L, 2017
- Noble County52.9% of reported tests at or above 4 pCi/L, 2017
- Orange County43.5% of reported tests at or above 4 pCi/L, 2017
- Putnam County34.5% of reported tests at or above 4 pCi/L, 2017
- Randolph County60.7% of reported tests at or above 4 pCi/L, 2017
- Rush County47.1% of reported tests at or above 4 pCi/L, 2017
- Scott County35.3% of reported tests at or above 4 pCi/L, 2017
- Shelby County50.0% of reported tests at or above 4 pCi/L, 2017
- St. Joseph County29.3% of reported tests at or above 4 pCi/L, 2017
- Steuben County55.7% of reported tests at or above 4 pCi/L, 2017
- Tippecanoe County36.8% of reported tests at or above 4 pCi/L, 2017
- Tipton County49.3% of reported tests at or above 4 pCi/L, 2017
- Union County50.0% of reported tests at or above 4 pCi/L, 2017
- Vermillion County41.7% of reported tests at or above 4 pCi/L, 2017
- Wabash County59.3% of reported tests at or above 4 pCi/L, 2017
- Warren County33.3% of reported tests at or above 4 pCi/L, 2017
- Washington County42.1% of reported tests at or above 4 pCi/L, 2017
- Wayne County56.4% of reported tests at or above 4 pCi/L, 2017
- Wells County47.8% of reported tests at or above 4 pCi/L, 2017
- White County35.7% of reported tests at or above 4 pCi/L, 2017
- Whitley County51.6% of reported tests at or above 4 pCi/L, 2017
Zone 2: moderate predicted potential35
- Brown County25.9% of reported tests at or above 4 pCi/L, 2017
- Clay County26.1% of reported tests at or above 4 pCi/L, 2017
- Crawford County30.0% of reported tests at or above 4 pCi/L, 2017
- Daviess County34.5% of reported tests at or above 4 pCi/L, 2017
- Dearborn County30.1% of reported tests at or above 4 pCi/L, 2017
- Dubois County44.1% of reported tests at or above 4 pCi/L, 2017
- Floyd County42.4% of reported tests at or above 4 pCi/L, 2017
- Franklin County28.0% of reported tests at or above 4 pCi/L, 2017
- Gibson County43.3% of reported tests at or above 4 pCi/L, 2017
- Greene County32.7% of reported tests at or above 4 pCi/L, 2017
- Jackson County27.3% of reported tests at or above 4 pCi/L, 2017
- Jasper County14.1% of reported tests at or above 4 pCi/L, 2017
- Jefferson County45.8% of reported tests at or above 4 pCi/L, 2017
- Knox County43.1% of reported tests at or above 4 pCi/L, 2017
- Lake County23.5% of reported tests at or above 4 pCi/L, 2017
- LaPorte County58.2% of reported tests at or above 4 pCi/L, 2017
- Martin County37.5% of reported tests at or above 4 pCi/L, 2017
- Morgan County44.2% of reported tests at or above 4 pCi/L, 2017
- Newton County12.5% of reported tests at or above 4 pCi/L, 2017
- Ohio County52.4% of reported tests at or above 4 pCi/L, 2017
- Owen County39.1% of reported tests at or above 4 pCi/L, 2017
- Parke County68.0% of reported tests at or above 4 pCi/L, 2017
- Perry County23.1% of reported tests at or above 4 pCi/L, 2017
- Pike County50.0% of reported tests at or above 4 pCi/L, 2017
- Porter County46.5% of reported tests at or above 4 pCi/L, 2017
- Posey County35.3% of reported tests at or above 4 pCi/L, 2017
- Pulaski County31.8% of reported tests at or above 4 pCi/L, 2017
- Ripley County35.3% of reported tests at or above 4 pCi/L, 2017
- Spencer County60.0% of reported tests at or above 4 pCi/L, 2017
- Starke County4.2% of reported tests at or above 4 pCi/L, 2017
- Sullivan County46.2% of reported tests at or above 4 pCi/L, 2017
- Switzerland County33.3% of reported tests at or above 4 pCi/L, 2017
- Vanderburgh County24.4% of reported tests at or above 4 pCi/L, 2017
- Vigo County44.0% of reported tests at or above 4 pCi/L, 2017
- Warrick County20.9% of reported tests at or above 4 pCi/L, 2017
Indiana, Cities
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.
Indiana, Local resources
Local resources in Indiana
Who to ask in Indiana: the state's radon program, test kits and professionals.
Indiana's radon program
Indiana Department of Health
Indiana’s radon program answers questions about testing, mitigation and the rules where you live.
- 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.
Test kits
The program says: To purchase a low-cost radon short term or long term test kit, please visit the American Lung Association
Radon professionals
6 professionals are listed in Indiana.
Professionals in IndianaIndiana, Questions
Questions about radon in Indiana
Common questions9 questions, answered from the figures above
Is radon a problem in Indiana?
EPA's Map of Radon Zones places 57 of the 92 Indiana counties it classifies in Zone 1, the highest predicted potential, 35 in Zone 2 and 0 in Zone 3. An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
Who does radon mitigation in Indiana?
Radon411's Indiana directory lists 6 certified radon companies. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional.
How radon mitigation worksWhat mitigation costsRadon professionals in Indiana
Which Indiana counties are in EPA radon Zone 1?
57 counties are in Zone 1: Adams County, Allen County, Bartholomew County, Benton County, Blackford County, Boone County, Carroll County, Cass County, and 49 more in the county table on this page. Zone 1 is EPA's class for highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. A zone is a prediction for a county, not a measurement of any home.
Radon in Adams CountyRadon in Allen CountyRadon in Bartholomew County
How do I get a radon test in Indiana?
EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. The Indiana radon program is the place to ask about certified testers and any test kit offer it runs.
How to test a homeFree and low-cost kits by stateIndiana radon program
Which Indiana counties have the highest radon?
92 of Indiana's 92 counties have an EPA radon zone published here. Radon411 will not rank counties on data it does not hold, and a zone is a prediction for an area rather than a measurement of any building.
What share of radon tests in Indiana are high?
CDC has published no statewide radon testing statistics for Indiana, so we cannot give a figure. Where CDC does publish one, the percentage describes radon tests reported to CDC, not homes.
Which EPA region is Indiana in?
Indiana is in EPA Region 5: Great Lakes.
Do I need to test my home in Indiana?
Yes, wherever you live in the state. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L.
Why does this page show coverage rather than one radon level for Indiana?
A statewide figure averages counties with very different geology and very different numbers of reported tests, so it hides more than it shows. The county report is the level at which the EPA zone, the geologic potential and the reported testing statistics are actually published, which is why the county table above links to every one of them.
What these figures mean if you own, buy, sell or rent
The zone counts on this page describe counties across Indiana. They are predictions for areas, and none of them measures your building.
- How to test a home
If you own your home
Test the lowest lived-in level; a short-term kit screens in days, a long-term kit reflects the year.
- Buying a house: radon guide
If you are buying
Ask for past results and any system's post-mitigation test, and test during the sale.
- Selling a house: radon guide
If you are selling
Testing before you list puts the timing in your hands; disclosure rules differ by state.
- Radon in rental homes
If you rent, or rent out a home
A tenant can test; a fix is the owner's to make, and duties differ by state.
How long a test has to run, under what conditions, and what EPA says a result means: the testing standard, in full.
Indiana, Products
Testing and mitigation products
Whatever the figures for Indiana show, only a test tells you about one home.
Testing
- Short-term test kitsPassive detectors exposed for a few days under closed-building conditions, then analyzed by a lab.
- Long-term test kitsDetectors exposed for more than 90 days, for a closer picture of the annual average.
- Continuous monitorsPowered devices that log radon on a repeating cycle, often used for transaction tests.
- Digital detectorsConsumer devices that display a running radon reading without a lab.
- Water radon testsKits for radon dissolved in well water, analyzed by a lab.
Mitigation
- Mitigation fansThe inline fan that keeps a soil depressurization system running, sized by the installer.
- System indicatorsU-tube manometers and fan alarms that show whether a mitigation system is still working.
- Sealing materialsCrack, joint and sump sealing used alongside a mitigation system, not instead of one.
Indiana / Next steps
What to do next
Learn
Know what radon is
What radon is, how it gets indoors, and why a county zone is not a reading for your home.
Learn about radonTest
Test the building you live in
Short-term or long-term, where the device goes, and closed-house conditions.
How to testFix
Bring a high level down
How a mitigation system works, and the retest that confirms it.
How mitigation worksFind a pro
Hire a certified professional
Measurement and mitigation professionals by state, with their certifications.
Find a professional
Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.