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Michigan Radon Map and Levels by County

Michigan's counties span all three EPA radon zones. 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

    26.9%

    8.8 pts below U.S.

    Michigan
    26.9%
    U.S.
    35.7%

    114,407 tests across 83 counties, 2008 to 2017

  • Rank among states

    24 of 47

    Middle of the states

    Michigan
    26.9%
    North Dakota
    59.3%

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

  • Counties in EPA Zone 1

    9 of 83

    Some at highest potential

    Zone 1
    9
    Zone 2
    32

    Most counties sit in Zone 3; Zone 1 is the highest potential

  • Highest county

    56.7%

    Lenawee County

    Lenawee
    56.7%
    Muskegon
    3.2%

    Counties with 30+ tests, 2008 to 2017

Read a result for Michigan

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. 26.9% of Michigan's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Michigan, At a glance

Michigan at a glance

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 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 Michigan's radon test figures by county: 83 of its 83 counties have one. Each one's share is in the county list.

How to read these figures

Michigan, Compared

Michigan radon figures, compared

Calculated by Radon411
Michigan, 2008 to 2017, laboratory
26.9%
of 114,407 tests at or above 4 pCi/L, pooled
Against the U.S.
−8.8points
35.7% pooled
Rank among the states
24 of 47
1 is the highest share
Counties with 30 or more tests
82
Highest
56.7%
Lenawee County
Lowest
3.2%
Muskegon County

About 3 in 10 of the 114,407 tests reported for Michigan over the 2008 to 2017 laboratory totals came back at or above 4 pCi/L (26.9%, 83 counties pooled). That is 24th of 47 states with county figures for the period; New Mexico (28.5%) above it and Connecticut (26.5%) below.

By band, 3 counties at 50% or more, 18 counties at 30% to 50%, 29 counties at 15% to 30%, 31 counties at 5% to 15%, 1 county at under 5%. Its 82 counties with 30 or more tests run from 3.2% in Muskegon County to 56.7% in Lenawee County; in 3 of them half or more of the reported tests reached 4 pCi/L.

EPA's 1993 map puts 9 of its 83 classified counties in Zone 1; the tests reported since bear that out at 26.9%. The national pool for the same period is 35.7%, so Michigan runs 8.8 points below the country.

Across its 4 overlapping ten-year totals, the share went from 26.2% (2005 to 2014) to 26.9% (2008 to 2017), within 2 points, with 2008 to 2017 the highest at 26.9%.

Michigan 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
New Hampshire19 of 471015,60835.0%
Tennessee20 of 479531,06633.3%
Missouri21 of 4711558,52530.6%
Virginia22 of 4713153,19930.4%
New Mexico23 of 47293,72128.5%
Michigan24 of 4783114,40726.9%
Connecticut25 of 47825,57226.5%
Washington26 of 47398,20125.5%
Oregon27 of 473423,95125.4%
Georgia28 of 4712930,15224.8%
New York29 of 476297,14524.5%
Michigan'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
Lenawee County1 of 821,90756.7%
Branch County2 of 821,04855.4%
Hillsdale County3 of 822,08654.8%
Jackson County4 of 822,96449.7%
Livingston County5 of 824,88543.1%
Washtenaw County6 of 828,50041.3%
Dickinson County7 of 8284339.3%
Clinton County8 of 822,31338.5%
Otsego County9 of 821,08038.2%
Ionia County10 of 821,39136.8%
Muskegon County82 of 826293.2%
Midland County81 of 822,0065.3%
Oceana County80 of 823385.9%
Crawford County79 of 821946.2%
Mason County78 of 824626.3%
Michigan'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 more35,041Lenawee County, Branch County, Hillsdale County
30% to 50%1838,564Jackson County, Livingston County, Washtenaw County
15% to 30%2950,410Oakland County, Huron County, Ingham County
5% to 15%3119,739Lake County, Missaukee County, Montmorency County
Under 5%1629Muskegon County
Michigan ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 201783114,40726.9%35.7%+0.1 points
2007 to 201683111,40626.8%35.8%Level
2006 to 201583108,88426.8%36.3%+0.6 points
2005 to 201483105,40326.2%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.

Michigan, Counties

Michigan counties by EPA zone

Predicted

The map of Michigan, then its 83 counties zone by zone, each with its reported share at or above 4 pCi/L and a report of its own.

Michigan radon map by county: EPA radon zones. Map of Michigan's 83 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber, Zone 3 in pale sand. 9 in Zone 1, 32 in Zone 2, 42 in Zone 3.
Michigan radon map by countyEPA radon zones for Michigan's counties: 9 counties in Zone 1, 32 counties in Zone 2, 42 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 Michigan, 2008 to 2017

Zone 1: highest predicted potential9

Local help

Michigan, Local resources

Local resources in Michigan

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

What Michigan's program says
Phone
800-723-6642
Email
Radon@Michigan.gov
Licensing of radon professionals
Michigan does not license or regulate radon testing and mitigation contractors.

What it means

Michigan, Questions

Questions about radon in Michigan

Is radon a problem in Michigan?

Michigan has 83 counties on EPA's Map of Radon Zones: Zone 1, the highest predicted potential, for 9; Zone 2 for 32; Zone 3 for 42. Pooled from 83 counties, 26.9% of the 114,407 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 24th of 47 states.

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.

Who does radon mitigation in Michigan?

Radon411's Michigan directory lists 69 radon businesses for testing, mitigation or both, each with the licensing list it was read from.

Which Michigan counties have the highest radon?

By the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory: Lenawee County 56.7% (1,907 tests), Branch County 55.4% (1,048 tests), Hillsdale County 54.8% (2,086 tests), Jackson County 49.7% (2,964 tests), Livingston County 43.1% (4,885 tests).

Which EPA region is Michigan in?

Michigan is in EPA Region 5: Great Lakes.

Products

Michigan, Products

Testing a home in Michigan

26.9% of the 114,407 tests reported to CDC for Michigan 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 Michigan; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Michigan homes, compared

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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.