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Radon Levels in Oakland County, Michigan

EPA puts Oakland County in Zone 2, its middle radon zone, and 28.8% of its 16,224 reported radon tests (2008 to 2017, laboratory totals) were 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    28.8%

    1.9 pts above MI

    Oakland
    28.8%
    Michigan
    26.9%

    16,224 tests, 2008 to 2017

  • Median result

    2.3pCi/L

    Below action level

    Oakland
    2.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    16,224

    Most tested in Michigan

    Oakland
    16,224

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Michigan

    22 of 82

    Middle half

    Oakland
    28.8%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Oakland County

Starts at Oakland County's median, 2.3 pCi/L

2.3pCi/L

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

EPA’s reading of 2.3 pCi/L

Between 2 and 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Oakland County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Oakland County, At a glance

Oakland County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Oakland County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 57% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Oakland County, 2008 to 2017, laboratory

Reported results by concentration band, Oakland County, 2008 to 2017, laboratory
Under 2 pCi/L: 44%2 to 4 pCi/L: 27%4 pCi/L and above: 29%

Of 16,224 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Oakland County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L7,18744.3%
2 to 4 pCi/L4,35726.9%
4 pCi/L and above4,68028.8%
What these figures count

These are the 16,224 tests reported to CDC for Oakland 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

Oakland County, Compared

Oakland County radon figures, compared

Calculated by Radon411

Oakland County's 16,224 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.3 pCi/L and a maximum of 2297.0 pCi/L, and 28.8% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 1.9 points lower than here.

Among its state's counties it ranks 22nd of 82 Michigan counties with 30 or more tests for the same period. Statewide for the same period, Lenawee County reported the highest share (56.7%) and Muskegon County the lowest (3.2%).

Below the action level, 7,187 tests (44.3%) came in under 2 pCi/L, against 46.4% statewide, and 4,357 tests (26.9%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Oakland County went from 13,149 tests (2005 to 2014) to 16,224 (2008 to 2017), the share going from 29.8% to 28.8%.

EPA's 1993 zone map puts Oakland County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 57% of the county's land moderate radon potential.

Next door, the shares run from 13.4% in Macomb County to 43.1% in Livingston County, with Genesee County, Wayne County and Macomb County below Oakland County.

CDC also counts 1,683 tests taken after mitigation in Oakland County for the same period: tests in homes where a fix was already in.

Oakland County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Oakland County
Oakland County16,22428.8%2.3 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled−1.9 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+6.9 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+27.9 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−25.6 points
Livingston County, MIborders it4,88543.1%3.4 pCi/L+14.3 points
Washtenaw County, MIborders it8,50041.3%3.2 pCi/L+12.5 points
Lapeer County, MIborders it64933.4%2.7 pCi/L+4.6 points
Genesee County, MIborders it1,69921.9%2.0 pCi/L−6.9 points
Wayne County, MIborders it5,59417.5%1.8 pCi/L−11.3 points
Macomb County, MIborders it5,62913.4%1.6 pCi/L−15.4 points
Where Oakland County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultOakland County testsOakland County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L7,18744.3%46.4%39.6%−2.1 points
2 to 4 pCi/L4,35726.9%26.7%24.7%+0.2 points
4 pCi/L and above4,68028.8%26.9%35.7%+1.9 points
Oakland County ranked among the 82 Michigan counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Kalamazoo County17 of 824,10033.3%2.8 pCi/L
Shiawassee County18 of 821,51531.6%2.5 pCi/L
Barry County19 of 821,61530.7%2.6 pCi/L
Cass County20 of 8257230.4%2.6 pCi/L
Monroe County21 of 821,37530.4%2.5 pCi/L
Oakland County22 of 8216,22428.8%2.3 pCi/L
Huron County23 of 8226026.5%1.9 pCi/L
Ingham County24 of 822,93224.9%2.2 pCi/L
Berrien County25 of 821,19224.2%2.0 pCi/L
Montcalm County26 of 8255023.6%2.1 pCi/L
Marquette County27 of 821,08223.4%2.0 pCi/L
Oakland County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 201716,22428.8%2.3 pCi/L2297.0 pCi/L26.9%−0.9 points
2007 to 201615,58329.7%2.3 pCi/L2297.0 pCi/L26.8%−0.6 points
2006 to 201514,22730.3%2.3 pCi/L2297.0 pCi/L26.8%+0.5 points
2005 to 201413,14929.8%2.3 pCi/L2297.0 pCi/L26.2%First on file

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

Oakland County, State data

Michigan's own radon test data

Measured

What Michigan's own agencies publish about radon tests in Oakland County, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What Michigan EGLE reports for the ZIP codes in Oakland County

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 70 ZIP codes that lie wholly or partly in Oakland County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Oakland County
ZIP codeWhat the state reports
480095% greater than 4 pCi/L, median 1.6 pCi/L, 158 tests
480171% greater than 4 pCi/L, median 1.2 pCi/L, 73 tests
4802510% greater than 4 pCi/L, median 1.7 pCi/L, 255 tests
480300% greater than 4 pCi/L, median 0.3 pCi/L, 21 tests
480336% greater than 4 pCi/L, median 1.5 pCi/L, 31 tests
4803410% greater than 4 pCi/L, median 1.0 pCi/L, 21 tests
480671% greater than 4 pCi/L, median 0.8 pCi/L, 154 tests
480690% greater than 4 pCi/L, median 0.7 pCi/L, 20 tests
480702% greater than 4 pCi/L, median 1.0 pCi/L, 125 tests
480710% greater than 4 pCi/L, median 1.0 pCi/L, 80 tests
480724% greater than 4 pCi/L, median 1.2 pCi/L, 171 tests
480737% greater than 4 pCi/L, median 1.3 pCi/L, 256 tests
480750% greater than 4 pCi/L, median 1.1 pCi/L, 50 tests
480764% greater than 4 pCi/L, median 1.3 pCi/L, 114 tests
480837% greater than 4 pCi/L, median 1.3 pCi/L, 157 tests
4808417% greater than 4 pCi/L, median 1.9 pCi/L, 84 tests
480858% greater than 4 pCi/L, median 1.3 pCi/L, 181 tests
4809821% greater than 4 pCi/L, median 2.1 pCi/L, 235 tests
4816536% greater than 4 pCi/L, median 3.5 pCi/L, 44 tests
4816739% greater than 4 pCi/L, median 3.1 pCi/L, 182 tests
4817831% greater than 4 pCi/L, median 2.4 pCi/L, 372 tests
482202% greater than 4 pCi/L, median 0.7 pCi/L, 118 tests
482371% greater than 4 pCi/L, median 1.1 pCi/L, 94 tests
4830124% greater than 4 pCi/L, median 2.3 pCi/L, 130 tests
4830220% greater than 4 pCi/L, median 2.4 pCi/L, 162 tests
4830426% greater than 4 pCi/L, median 1.9 pCi/L, 201 tests
4830622% greater than 4 pCi/L, median 2.1 pCi/L, 331 tests
4830717% greater than 4 pCi/L, median 1.7 pCi/L, 273 tests
4830922% greater than 4 pCi/L, median 2.1 pCi/L, 333 tests
483200% greater than 4 pCi/L, median 1.2 pCi/L, 30 tests
4832218% greater than 4 pCi/L, median 1.9 pCi/L, 177 tests
4832318% greater than 4 pCi/L, median 2.1 pCi/L, 152 tests
4832429% greater than 4 pCi/L, median 2.5 pCi/L, 151 tests
4832626% greater than 4 pCi/L, median 2.3 pCi/L, 93 tests
4832720% greater than 4 pCi/L, median 2.3 pCi/L, 104 tests
4832823% greater than 4 pCi/L, median 1.4 pCi/L, 191 tests
4832943% greater than 4 pCi/L, median 3.4 pCi/L, 180 tests
4833128% greater than 4 pCi/L, median 2.7 pCi/L, 163 tests
4833424% greater than 4 pCi/L, median 2.1 pCi/L, 127 tests
4833525% greater than 4 pCi/L, median 2.4 pCi/L, 110 tests
4833610% greater than 4 pCi/L, median 1.7 pCi/L, 119 tests
483409% greater than 4 pCi/L, median 1.1 pCi/L, 22 tests
483414% greater than 4 pCi/L, median 0.8 pCi/L, 23 tests
483429% greater than 4 pCi/L, median 1.2 pCi/L, 11 tests
4834650% greater than 4 pCi/L, median 4.0 pCi/L, 239 tests
4834838% greater than 4 pCi/L, median 3.1 pCi/L, 295 tests
4835041% greater than 4 pCi/L, median 2.9 pCi/L, 61 tests
4835642% greater than 4 pCi/L, median 3.8 pCi/L, 50 tests
4835747% greater than 4 pCi/L, median 3.3 pCi/L, 51 tests
4835922% greater than 4 pCi/L, median 2.2 pCi/L, 73 tests
4836025% greater than 4 pCi/L, median 2.4 pCi/L, 144 tests
4836239% greater than 4 pCi/L, median 3.3 pCi/L, 79 tests
4836319% greater than 4 pCi/L, median 2.3 pCi/L, 81 tests
4836738% greater than 4 pCi/L, median 2.6 pCi/L, 21 tests
4837143% greater than 4 pCi/L, median 3.2 pCi/L, 203 tests
4837422% greater than 4 pCi/L, median 2.2 pCi/L, 152 tests
4837524% greater than 4 pCi/L, median 2.2 pCi/L, 180 tests
4837719% greater than 4 pCi/L, median 2.2 pCi/L, 75 tests
4838056% greater than 4 pCi/L, median 4.5 pCi/L, 81 tests
4838130% greater than 4 pCi/L, median 2.3 pCi/L, 247 tests
4838238% greater than 4 pCi/L, median 2.6 pCi/L, 174 tests
4838351% greater than 4 pCi/L, median 4.2 pCi/L, 74 tests
4838638% greater than 4 pCi/L, median 2.8 pCi/L, 138 tests
4839039% greater than 4 pCi/L, median 3.2 pCi/L, 145 tests
4839345% greater than 4 pCi/L, median 3.1 pCi/L, 69 tests
4842827% greater than 4 pCi/L, median 2.4 pCi/L, 22 tests
4843038% greater than 4 pCi/L, median 2.7 pCi/L, 233 tests
4843912% greater than 4 pCi/L, median 1.6 pCi/L, 100 tests
4844233% greater than 4 pCi/L, median 3.2 pCi/L, 81 tests
4846232% greater than 4 pCi/L, median 2.8 pCi/L, 92 tests
  • EGLE's figures cover first-time tests only, from organizations willing to provide data.
  • EGLE does not publish figures for a ZIP code with fewer than 5 test results.
  • EGLE says the map is not intended to decide whether a home should be tested: all homes should be tested.
  • ZIP code boundaries are postal delivery areas, not legal or administrative boundaries.
  • A ZIP code that crosses the county line is listed whole; its figures cover all of it.

Measured: Michigan EGLE data, About 10 years to 2026-05-15.

Oakland County, Geology

The ground under Oakland County

Predicted

USGS's geologic map splits Oakland County: 56.8% of its land is moderate radon potential and 43.2% high. The map puts 47.7% of Oakland County in the area it calls South-Central Michigan Basin and 43.2% in Saginaw Lobe Moraine Area, with one smaller area beside them. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).

USGS's geologic areas under Oakland County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
South-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Moderate1047.7%
Saginaw Lobe Moraine AreaGlacial deposits derived from Sandstone and shale.High1243.2%
Antrim Shale-Lake depositsAntrim black shale covered by glacial lake deposits.Moderate99.1%

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

Oakland County beside the ground around it

Oakland County has more high-potential ground than Michigan as a whole: 43.2% of its land against 9.6%. Of the 6 counties that border it, 2 have more high-potential ground, Washtenaw County the most at 84.9%.

Share of land by USGS radon potential: Oakland County, the 6 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Oakland CountyZone 2None56.8%43.2%
Macomb CountyZone 3None99.8%None
Wayne CountyZone 3None87.1%8.3%
Livingston CountyZone 2None53.6%46.4%
Genesee CountyZone 219.5%80.5%None
Lapeer CountyZone 2None100%None
Washtenaw CountyZone 1None15.1%84.9%
Michigan83 counties, pooled by land areaVaries45.0%44.3%9.6%

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

Local help

Oakland County, Local resources

Radon testing and mitigation in Oakland County

Listed radon businesses with an address in Oakland County:

Listed radon professionals by town: Farmington Hills, Madison Heights, Ferndale, Northville, Bloomfield Hills, Oxford, Sylvan Lake

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

Oakland County, Questions

Questions about radon in Oakland County

Are radon levels high in Oakland County?

Over the 2008 to 2017 laboratory totals, 28.8% of the radon tests reported to CDC for Oakland County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.3 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 21 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Oakland County?

Oakland County borders 6 counties: Macomb County, Wayne County, Livingston County, Genesee County, Lapeer County and Washtenaw County.

Products

Oakland County, Products

Testing a home in Oakland County

In Oakland County, 28.8% of 16,224 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Oakland County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Oakland County homes, compared

Explore

Oakland County, Bordering counties

Counties bordering Oakland County

Calculated by Radon411

Oakland County, Cities and towns

Cities and towns in Oakland County

The Census Bureau estimates 1,288,337 residents in Oakland County for July 1, 2025, 15,813 more than in 2020 (+1.2%). Packed into its land, that is 1,486 people per square mile. No town dominates: Troy, the largest, has 88,733 residents, 6.9% of the total. CDC's 16,224 reported tests for 2008 to 2017 work out to 12.6 per 1,000 residents (2025 estimate), close to Michigan's 11.3.

From Troy to Lake Angelus, CDC publishes no figure by town: each reads Oakland County's.

The 12 largest cities and towns in Oakland County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Troy88,733+1.9%6.9%
Farmington Hills83,291−0.7%6.5%
Rochester Hills77,539+1.8%6.0%
Southfield76,111−0.4%5.9%
Novi67,319+1.8%5.2%
Pontiac62,077+0.4%4.8%
Royal Oak57,583−0.8%4.5%
Oak Park29,072−1.4%2.3%
Madison Heights28,297−0.3%2.2%
Auburn Hills25,925+6.4%2.0%
Birmingham21,923+0.7%1.7%
Ferndale19,212+0.1%1.5%
  • Wixom
  • Berkley
  • Hazel Park
  • Rochester
  • South Lyon
  • Fenton (part)
  • Farmington
  • Clawson
  • Beverly Hills
  • Walled Lake
  • Milford
  • Huntington Woods
  • Northville (part)
  • Holly
  • Wolverine Lake
  • Bloomfield Hills
  • Lathrup Village
  • Oxford
  • Franklin
  • Lake Orion
  • Keego Harbor
  • Pleasant Ridge
  • Orchard Lake Village
  • Sylvan Lake
The other 5 places in Oakland County
  • Ortonville
  • Bingham Farms
  • Village of Clarkston
  • Leonard
  • Lake Angelus

41 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Oakland County, Homes

Homes in Oakland County

Of Oakland County's 557,978 homes, 68% are detached houses, against 72% across Michigan; 18% are in buildings of five or more homes. Half of its homes were built before 1975, close to Michigan's 1972: 28% date from before 1960 and 15% from 2000 or later. 72% of occupied homes are lived in by their owner (Michigan: 73%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Oakland County, Michigan, 2019 to 2023
HomesOakland CountyMichigan
Housing units557,9784,599,683
Detached houses68%72%
In buildings of 5 or more18%13%
Mobile homes3%5%
Built before 196028%36%
Built since 200015%15%
Middle year built19751972
Owner-occupied72%73%

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