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Radon Levels in Genesee County, Michigan

EPA puts Genesee County in Zone 2, its middle radon zone, and 21.9% of its 1,699 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

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  • Share at 4+ pCi/L

    21.9%

    5.0 pts below MI

    Genesee
    21.9%
    Michigan
    26.9%

    1,699 tests, 2008 to 2017

  • Median result

    2.0pCi/L

    Below action level

    Genesee
    2.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,699

    17th of 82 by tests

    Genesee
    1,699
    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

    30 of 82

    Middle half

    Genesee
    21.9%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Genesee County

Starts at Genesee County's median, 2.0 pCi/L

2.0pCi/L

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

EPA’s reading of 2.0 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. Genesee County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Genesee County, At a glance

Genesee County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Genesee 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 81% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Genesee County, 2008 to 2017, laboratory
Under 2 pCi/L: 50%2 to 4 pCi/L: 28%4 pCi/L and above: 22%

Of 1,699 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Genesee County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L84649.8%
2 to 4 pCi/L48128.3%
4 pCi/L and above37221.9%
What these figures count

These are the 1,699 tests reported to CDC for Genesee 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

Genesee County, Compared

Genesee County radon figures, compared

Calculated by Radon411

Genesee County's 1,699 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.0 pCi/L and a maximum of 37.7 pCi/L, and 21.9% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 5.0 points higher than here.

Among its state's counties it ranks 30th 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, 846 tests (49.8%) came in under 2 pCi/L, against 46.4% statewide, and 481 tests (28.3%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Genesee County went from 2,091 tests (2005 to 2014) to 1,699 (2008 to 2017), the share going from 18.5% to 21.9%.

EPA's 1993 zone map puts Genesee County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 81% of the county's land moderate radon potential.

Next door, the shares run from 17.0% in Saginaw County to 43.1% in Livingston County, with Saginaw County below Genesee County.

CDC also counts 127 tests taken after mitigation in Genesee County for the same period: tests in homes where a fix was already in.

Genesee County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Genesee County
Genesee County1,69921.9%2.0 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+5.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+13.8 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+34.8 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−18.7 points
Livingston County, MIborders it4,88543.1%3.4 pCi/L+21.2 points
Tuscola County, MIborders it36935.5%2.6 pCi/L+13.6 points
Lapeer County, MIborders it64933.4%2.7 pCi/L+11.5 points
Shiawassee County, MIborders it1,51531.6%2.5 pCi/L+9.7 points
Oakland County, MIborders it16,22428.8%2.3 pCi/L+6.9 points
Saginaw County, MIborders it3,03717.0%1.7 pCi/L−4.9 points
Where Genesee County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultGenesee County testsGenesee County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L84649.8%46.4%39.6%+3.4 points
2 to 4 pCi/L48128.3%26.7%24.7%+1.6 points
4 pCi/L and above37221.9%26.9%35.7%−5.0 points
Genesee 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
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
Presque Isle County28 of 8250922.8%1.9 pCi/L
Keweenaw County29 of 824422.7%0.9 pCi/L
Genesee County30 of 821,69921.9%2.0 pCi/L
Mecosta County31 of 8261421.7%2.0 pCi/L
Delta County32 of 8271121.5%1.7 pCi/L
Alcona County33 of 8218520.5%1.7 pCi/L
Mackinac County34 of 829119.8%1.2 pCi/L
Oscoda County35 of 825418.5%2.1 pCi/L
Genesee County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 20171,69921.9%2.0 pCi/L37.7 pCi/L26.9%+1.7 points
2007 to 20161,91720.2%1.9 pCi/L37.7 pCi/L26.8%+0.9 points
2006 to 20152,07919.3%1.8 pCi/L37.7 pCi/L26.8%+0.8 points
2005 to 20142,09118.5%1.8 pCi/L37.7 pCi/L26.2%First on file

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

Genesee County, State data

Michigan's own radon test data

Measured

What Michigan's own agencies publish about radon tests in Genesee 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 Genesee County

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 31 ZIP codes that lie wholly or partly in Genesee County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Genesee County
ZIP codeWhat the state reports
48411
484158% greater than 4 pCi/L, median 1.1 pCi/L, 72 tests
4841844% greater than 4 pCi/L, median 3.0 pCi/L, 18 tests
4842038% greater than 4 pCi/L, median 3.3 pCi/L, 16 tests
4842143% greater than 4 pCi/L, median 3.0 pCi/L, 23 tests
4842322% greater than 4 pCi/L, median 2.1 pCi/L, 60 tests
4842933% greater than 4 pCi/L, median 2.4 pCi/L, 55 tests
4843038% greater than 4 pCi/L, median 2.7 pCi/L, 233 tests
4843313% greater than 4 pCi/L, median 1.8 pCi/L, 48 tests
4843633% greater than 4 pCi/L, median 3.0 pCi/L, 9 tests
4843827% greater than 4 pCi/L, median 2.5 pCi/L, 48 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
4844933% greater than 4 pCi/L, median 2.8 pCi/L, 18 tests
4845133% greater than 4 pCi/L, median 3.0 pCi/L, 80 tests
484570% greater than 4 pCi/L, median 1.0 pCi/L, 20 tests
4845815% greater than 4 pCi/L, median 1.5 pCi/L, 13 tests
484606% greater than 4 pCi/L, median 2.2 pCi/L, 17 tests
4846232% greater than 4 pCi/L, median 2.8 pCi/L, 92 tests
4846343% greater than 4 pCi/L, median 3.8 pCi/L, 7 tests
4847318% greater than 4 pCi/L, median 1.8 pCi/L, 40 tests
4850311% greater than 4 pCi/L, median 1.0 pCi/L, 18 tests
485040% greater than 4 pCi/L, median 0.9 pCi/L, 10 tests
485050% greater than 4 pCi/L, median 0.3 pCi/L, 42 tests
4850615% greater than 4 pCi/L, median 1.3 pCi/L, 13 tests
485075% greater than 4 pCi/L, median 1.9 pCi/L, 20 tests
485090% greater than 4 pCi/L, median 0.7 pCi/L, 8 tests
48519
485292 tests, figures not shown
4853214% greater than 4 pCi/L, median 1.3 pCi/L, 22 tests
4874632% greater than 4 pCi/L, median 2.1 pCi/L, 25 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.

Genesee County, Geology

The ground under Genesee County

Predicted

Most of the ground under Genesee County is one class on USGS's geologic map: 80.5% of its land is moderate radon potential, with 19.5% low. The map puts 80.5% of Genesee County in the area it calls South-Central Michigan Basin and 19.5% in Glacial Lakes. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 7, in the low band (5 to 8).

USGS's geologic areas under Genesee 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.Moderate1080.5%
Glacial LakesSilt and clay glacial lake deposits.Low719.5%

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

Genesee County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Genesee County's is. Of the 6 counties that border it, 2 have more high-potential ground, Livingston County the most at 46.4%.

Share of land by USGS radon potential: Genesee County, the 6 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Genesee CountyZone 219.5%80.5%None
Shiawassee CountyZone 224.1%75.9%None
Livingston CountyZone 2None53.6%46.4%
Lapeer CountyZone 2None100%None
Oakland CountyZone 2None56.8%43.2%
Tuscola CountyZone 366.9%32.9%None
Saginaw CountyZone 3100%NoneNone
Michigan83 counties, pooled by land areaVaries45.0%44.3%9.6%

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

Local help

Genesee County, Local resources

Radon testing and mitigation in Genesee County

Listed radon businesses with an address in Genesee County:

Listed radon professionals by town: Grand Blanc, Goodrich

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

Genesee County, Questions

Questions about radon in Genesee County

Are radon levels high in Genesee County?

Over the 2008 to 2017 laboratory totals, 21.9% of the radon tests reported to CDC for Genesee County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 29 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Genesee County?

Genesee County borders 6 counties: Shiawassee County, Livingston County, Lapeer County, Oakland County, Tuscola County and Saginaw County.

Products

Genesee County, Products

Testing a home in Genesee County

In Genesee County, 21.9% of 1,699 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 Genesee County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Genesee County homes, compared

Explore

Genesee County, Bordering counties

Counties bordering Genesee County

Calculated by Radon411

Genesee County, Cities and towns

Cities and towns in Genesee County

About 401,093 people live in Genesee County by the Census Bureau's estimate for July 1, 2025, 4,653 fewer than in 2020 (−1.1%). That works out to 630 people per square mile of land. No town dominates: Flint, the largest, has 79,306 residents, 19.8% of the total. Reported testing is thin here: 1,699 tests over 2008 to 2017, or 4.2 for every 1,000 residents (2025 estimate), where Michigan as a whole comes to 11.3.

From Flint to Otter Lake, CDC publishes no figure by town: each reads Genesee County's.

The 12 largest cities and towns in Genesee County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Flint79,306−2.2%19.8%
Burton29,313−1.2%7.3%
Fentonextends beyond Genesee County11,774−1.6%Counted whole
Flushing8,175−2.6%2.0%
Grand Blanc7,880−2.5%2.0%
Swartz Creek5,827−1.0%1.5%
Davison5,039−1.8%1.3%
Linden4,186+1.0%1.0%
Mount Morris3,086−2.4%0.8%
Clio2,478−2.3%0.6%
Goodrich2,003−0.8%0.5%
Montrose1,700−2.2%0.4%
  • Otisville
  • Lennon (part)
  • Gaines
  • Otter Lake (part)

16 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). A place that extends beyond Genesee County is counted whole, so it has no share.

Genesee County, Homes

Homes in Genesee County

Of Genesee County's 183,729 homes, 74% are detached houses, against 72% across Michigan; 12% are in buildings of five or more homes. Half of its homes were built before 1969, close to Michigan's 1972: 36% date from before 1960 and 13% from 2000 or later. 71% 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 Genesee County, Michigan, 2019 to 2023
HomesGenesee CountyMichigan
Housing units183,7294,599,683
Detached houses74%72%
In buildings of 5 or more12%13%
Mobile homes6%5%
Built before 196036%36%
Built since 200013%15%
Middle year built19691972
Owner-occupied71%73%

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