Locations and reports
Radon Levels in Michigan
What this means for you
- Your area: EPA rates 9 of Michigan's 83 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 Michigan'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 Michigan, EPA's Map of Radon Zones places 9 of its 83 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
83 of 83 counties classified
EPA classifies counties, not states. Of the 83 counties in Michigan with a zone, 9 are in Zone 1, 32 in Zone 2 and 42 in Zone 3.
- Zone 1: Highest predicted potentialgreater than 4 pCi/L9 of 83 counties · 10.8%
- Zone 2: Moderate predicted potential2 to 4 pCi/L32 of 83 counties · 38.6%
- Zone 3: Lower predicted potentialless than 2 pCi/L42 of 83 counties · 50.6%
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 Michigan's radon test figures by county: 83 of its 83 counties have one. Each county's share is in the county list.
Michigan, In figures
Michigan in figures
What the published data says about Michigan, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places 9 of Michigan's 83 counties in Zone 1, 32 in Zone 2 and 42 in Zone 3.
Zone 1 counties, A to Z, begin with Branch County, Calhoun County and Cass County; the county section below lists all 9.
Compared
Calculated by Radon41111% of Michigan's counties with a zone on file are in Zone 1, a smaller 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 Michigan on file here.
83 of the 83 counties have a published county figure; the most tests in each one's latest year were reported for Oakland County (12,288 in 2017), Kent County (6,257 in 2017) and Washtenaw County (5,668 in 2017).
Local record
Michigan's radon program is the Michigan Indoor Radon Program, run by Michigan Department of Environment, Great Lakes, and Energy; its contacts are under Local resources.
3 cities have a page setting the figures of the counties it lies in side by side: Ann Arbor, Grand Rapids and Lansing.
Michigan, Counties
Michigan counties by EPA zone
PredictedAll 83 counties, by the zone EPA predicts for each. Every county has its own report.
Zone 1: highest predicted potential9
- Branch County55.4% of reported tests at or above 4 pCi/L, 2017
- Calhoun County36.4% of reported tests at or above 4 pCi/L, 2017
- Cass County30.4% of reported tests at or above 4 pCi/L, 2017
- Hillsdale County54.8% of reported tests at or above 4 pCi/L, 2017
- Jackson County49.7% of reported tests at or above 4 pCi/L, 2017
- Kalamazoo County33.3% of reported tests at or above 4 pCi/L, 2017
- Lenawee County56.7% of reported tests at or above 4 pCi/L, 2017
- St. Joseph County34.1% of reported tests at or above 4 pCi/L, 2017
- Washtenaw County41.3% of reported tests at or above 4 pCi/L, 2017
Zone 2: moderate predicted potential32
- Alcona County20.5% of reported tests at or above 4 pCi/L, 2017
- Alger County16.4% of reported tests at or above 4 pCi/L, 2017
- Alpena County13.3% of reported tests at or above 4 pCi/L, 2017
- Antrim County12.0% of reported tests at or above 4 pCi/L, 2017
- Baraga County11.0% of reported tests at or above 4 pCi/L, 2017
- Barry County30.7% of reported tests at or above 4 pCi/L, 2017
- Charlevoix County9.8% of reported tests at or above 4 pCi/L, 2017
- Clinton County38.5% of reported tests at or above 4 pCi/L, 2017
- Dickinson County39.3% of reported tests at or above 4 pCi/L, 2017
- Eaton County34.4% of reported tests at or above 4 pCi/L, 2017
- Emmet County15.2% of reported tests at or above 4 pCi/L, 2017
- Genesee County21.9% of reported tests at or above 4 pCi/L, 2017
- Gogebic County12.9% of reported tests at or above 4 pCi/L, 2017
- Houghton County10.8% of reported tests at or above 4 pCi/L, 2017
- Ingham County24.9% of reported tests at or above 4 pCi/L, 2017
- Ionia County36.8% of reported tests at or above 4 pCi/L, 2017
- Iron County36.2% of reported tests at or above 4 pCi/L, 2017
- Kent County16.5% of reported tests at or above 4 pCi/L, 2017
- Keweenaw County22.7% of reported tests at or above 4 pCi/L, 2017
- Lapeer County33.4% of reported tests at or above 4 pCi/L, 2017
- Leelanau County7.7% of reported tests at or above 4 pCi/L, 2017
- Livingston County43.1% of reported tests at or above 4 pCi/L, 2017
- Marquette County23.4% of reported tests at or above 4 pCi/L, 2017
- Menominee County11.7% of reported tests at or above 4 pCi/L, 2017
- Monroe County30.4% of reported tests at or above 4 pCi/L, 2017
- Montcalm County23.6% of reported tests at or above 4 pCi/L, 2017
- Montmorency County14.7% of reported tests at or above 4 pCi/L, 2017
- Oakland County28.8% of reported tests at or above 4 pCi/L, 2017
- Otsego County38.2% of reported tests at or above 4 pCi/L, 2017
- Presque Isle County22.8% of reported tests at or above 4 pCi/L, 2017
- Sanilac County16.6% of reported tests at or above 4 pCi/L, 2017
- Shiawassee County31.6% of reported tests at or above 4 pCi/L, 2017
Zone 3: lower predicted potential42
- Allegan County18.4% of reported tests at or above 4 pCi/L, 2017
- Arenac County8.9% of reported tests at or above 4 pCi/L, 2017
- Bay County8.5% of reported tests at or above 4 pCi/L, 2017
- Benzie County8.7% of reported tests at or above 4 pCi/L, 2017
- Berrien County24.2% of reported tests at or above 4 pCi/L, 2017
- Cheboygan County8.0% of reported tests at or above 4 pCi/L, 2017
- Chippewa County11.6% of reported tests at or above 4 pCi/L, 2017
- Clare County14.1% of reported tests at or above 4 pCi/L, 2017
- Crawford County6.2% of reported tests at or above 4 pCi/L, 2017
- Delta County21.5% of reported tests at or above 4 pCi/L, 2017
- Gladwin County15.4% of reported tests at or above 4 pCi/L, 2017
- Grand Traverse County11.5% of reported tests at or above 4 pCi/L, 2017
- Gratiot County16.8% of reported tests at or above 4 pCi/L, 2017
- Huron County26.5% of reported tests at or above 4 pCi/L, 2017
- Iosco County7.7% of reported tests at or above 4 pCi/L, 2017
- Isabella County16.4% of reported tests at or above 4 pCi/L, 2017
- Kalkaska County12.7% of reported tests at or above 4 pCi/L, 2017
- Lake County14.9% of reported tests at or above 4 pCi/L, 2017
- Luce County4.2% of reported tests at or above 4 pCi/L, 2017
- Mackinac County19.8% of reported tests at or above 4 pCi/L, 2017
- Macomb County13.4% of reported tests at or above 4 pCi/L, 2017
- Manistee County16.5% of reported tests at or above 4 pCi/L, 2017
- Mason County6.3% of reported tests at or above 4 pCi/L, 2017
- Mecosta County21.7% of reported tests at or above 4 pCi/L, 2017
- Midland County5.3% of reported tests at or above 4 pCi/L, 2017
- Missaukee County14.9% of reported tests at or above 4 pCi/L, 2017
- Muskegon County3.2% of reported tests at or above 4 pCi/L, 2017
- Newaygo County7.9% of reported tests at or above 4 pCi/L, 2017
- Oceana County5.9% of reported tests at or above 4 pCi/L, 2017
- Ogemaw County15.0% of reported tests at or above 4 pCi/L, 2017
- Ontonagon County11.4% of reported tests at or above 4 pCi/L, 2017
- Osceola County10.6% of reported tests at or above 4 pCi/L, 2017
- Oscoda County18.5% of reported tests at or above 4 pCi/L, 2017
- Ottawa County16.8% of reported tests at or above 4 pCi/L, 2017
- Roscommon County12.7% of reported tests at or above 4 pCi/L, 2017
- Saginaw County17.0% of reported tests at or above 4 pCi/L, 2017
- Schoolcraft County15.2% of reported tests at or above 4 pCi/L, 2017
- St. Clair County13.7% of reported tests at or above 4 pCi/L, 2017
- Tuscola County35.5% of reported tests at or above 4 pCi/L, 2017
- Van Buren County18.0% of reported tests at or above 4 pCi/L, 2017
- Wayne County17.5% of reported tests at or above 4 pCi/L, 2017
- Wexford County9.7% of reported tests at or above 4 pCi/L, 2017
Michigan, Cities
Cities in Michigan 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.
Michigan, Local resources
Local resources in Michigan
Who to ask in Michigan: the state's radon program, test kits and professionals.
Michigan Indoor Radon Program
Michigan Department of Environment, Great Lakes, and Energy
Michigan’s radon program answers questions about testing, mitigation and the rules where you live.
- Phone
- 800-723-6642
- Radon@Michigan.gov
- Licensing of radon professionals
Michigan does not license or regulate radon testing and mitigation contractors.
Test kits
Ask the program whether it has free or discounted kits, or compare kits you can buy.
Radon professionals
6 professionals are listed in Michigan.
Professionals in MichiganMichigan, Questions
Questions about radon in Michigan
Common questions9 questions, answered from the figures above
Is radon a problem in Michigan?
EPA's Map of Radon Zones places 9 of the 83 Michigan counties it classifies in Zone 1, the highest predicted potential, 32 in Zone 2 and 42 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.
Which Michigan counties are in EPA radon Zone 1?
9 counties are in Zone 1: Branch County, Calhoun County, Cass County, Hillsdale County, Jackson County, Kalamazoo County, Lenawee County, St. Joseph County, and 1 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 Branch CountyRadon in Calhoun CountyRadon in Cass County
Who does radon mitigation in Michigan?
Radon411's Michigan 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 Michigan
How do I get a radon test in Michigan?
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 Michigan 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 stateMichigan radon program
Which Michigan counties have the highest radon?
83 of Michigan's 83 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 Michigan are high?
CDC has published no statewide radon testing statistics for Michigan, 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 Michigan in?
Michigan is in EPA Region 5: Great Lakes.
Do I need to test my home in Michigan?
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 Michigan?
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 Michigan. 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.
Michigan, Products
Testing and mitigation products
Whatever the figures for Michigan 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.
Michigan / 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.