Skip to content
RADON411

Locations and reports

Radon Levels in Tuscola County, Michigan

EPA puts Tuscola County in Zone 3, its lowest radon zone, and 35.5% of its 369 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

    35.5%

    8.6 pts above MI

    Tuscola
    35.5%
    Michigan
    26.9%

    369 tests, 2008 to 2017

  • Median result

    2.6pCi/L

    Below action level

    Tuscola
    2.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    369

    53rd of 82 by tests

    Tuscola
    369
    Oakland
    16,224

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

  • Rank in Michigan

    13 of 82

    Top quarter

    Tuscola
    35.5%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Tuscola County

Starts at Tuscola County's median, 2.6 pCi/L

2.6pCi/L

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

EPA’s reading of 2.6 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. Tuscola County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Tuscola County, At a glance

Tuscola County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Tuscola County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

USGS geologic potential: Low across 67% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Tuscola County, 2008 to 2017, laboratory
Under 2 pCi/L: 38%2 to 4 pCi/L: 26%4 pCi/L and above: 36%

Of 369 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Tuscola County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L14138.2%
2 to 4 pCi/L9726.3%
4 pCi/L and above13135.5%
What these figures count

These are the 369 tests reported to CDC for Tuscola 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

Tuscola County, Compared

Tuscola County radon figures, compared

Calculated by Radon411

In Tuscola County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (131 of 369) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.2 points lower. Across 83 Michigan counties pooled together, 26.9% of tests reached that level, so Tuscola County runs 8.6 points above its state.

Of 6 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 8.5% (Bay County) to 33.4% (Lapeer County). By share, Tuscola County is 13th of 82 Michigan counties with 30 or more tests for the same period.

Half the tests came in under 2.6 pCi/L and half over it; the single highest reached 28.7 pCi/L. Below the action level, 141 tests (38.2%) came in under 2 pCi/L, against 46.4% statewide, and 97 tests (26.3%) fell between 2 and 4, against 26.7% statewide.

The reported tests do not follow EPA's Zone 3 label for Tuscola County (predicted average under 2 pCi/L): 35.5% of them reached 4 pCi/L, more than a low-potential zone suggests. USGS geology rates 67% of the county's land low radon potential. CDC also counts 12 tests taken after mitigation in Tuscola County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Tuscola County went from 385 tests (2005 to 2014) to 369 (2008 to 2017), the share going from 33.0% to 35.5%.

Tuscola County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Tuscola County
Tuscola County36935.5%2.6 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled−8.6 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+0.2 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+21.2 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−32.3 points
Lapeer County, MIborders it64933.4%2.7 pCi/L−2.1 points
Huron County, MIborders it26026.5%1.9 pCi/L−9.0 points
Genesee County, MIborders it1,69921.9%2.0 pCi/L−13.6 points
Saginaw County, MIborders it3,03717.0%1.7 pCi/L−18.5 points
Sanilac County, MIborders it32516.6%1.6 pCi/L−18.9 points
Bay County, MIborders it6248.5%1.4 pCi/L−27.0 points
Where Tuscola County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultTuscola County testsTuscola County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L14138.2%46.4%39.6%−8.2 points
2 to 4 pCi/L9726.3%26.7%24.7%−0.4 points
4 pCi/L and above13135.5%26.9%35.7%+8.6 points
Tuscola 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
Clinton County8 of 822,31338.5%3.1 pCi/L
Otsego County9 of 821,08038.2%3.2 pCi/L
Ionia County10 of 821,39136.8%2.9 pCi/L
Calhoun County11 of 821,64936.4%3.0 pCi/L
Iron County12 of 8226536.2%2.6 pCi/L
Tuscola County13 of 8236935.5%2.6 pCi/L
Eaton County14 of 823,41134.4%2.8 pCi/L
St. Joseph County15 of 821,06834.1%2.9 pCi/L
Lapeer County16 of 8264933.4%2.7 pCi/L
Kalamazoo County17 of 824,10033.3%2.8 pCi/L
Shiawassee County18 of 821,51531.6%2.5 pCi/L
Tuscola County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 201736935.5%2.6 pCi/L28.7 pCi/L26.9%+1.9 points
2007 to 201636933.6%2.5 pCi/L28.7 pCi/L26.8%+0.5 points
2006 to 201539033.1%2.5 pCi/L28.7 pCi/L26.8%+0.1 points
2005 to 201438533.0%2.4 pCi/L28.7 pCi/L26.2%First on file

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

Tuscola County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 19 ZIP codes that lie wholly or partly in Tuscola County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Tuscola County
ZIP codeWhat the state reports
484158% greater than 4 pCi/L, median 1.1 pCi/L, 72 tests
4842038% greater than 4 pCi/L, median 3.3 pCi/L, 16 tests
484352 tests, figures not shown
4845329% greater than 4 pCi/L, median 1.9 pCi/L, 7 tests
4870122% greater than 4 pCi/L, median 1.7 pCi/L, 9 tests
4872333% greater than 4 pCi/L, median 2.6 pCi/L, 98 tests
4872643% greater than 4 pCi/L, median 3.5 pCi/L, 28 tests
48727
4872917% greater than 4 pCi/L, median 0.6 pCi/L, 6 tests
4873320% greater than 4 pCi/L, median 1.9 pCi/L, 10 tests
4873428% greater than 4 pCi/L, median 2.8 pCi/L, 309 tests
4874143% greater than 4 pCi/L, median 2.3 pCi/L, 7 tests
4874415% greater than 4 pCi/L, median 2.0 pCi/L, 13 tests
4874632% greater than 4 pCi/L, median 2.1 pCi/L, 25 tests
4875736% greater than 4 pCi/L, median 2.8 pCi/L, 25 tests
4875925% greater than 4 pCi/L, median 2.7 pCi/L, 20 tests
487604 tests, figures not shown
487676% greater than 4 pCi/L, median 1.3 pCi/L, 17 tests
4876830% greater than 4 pCi/L, median 2.6 pCi/L, 37 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.

Tuscola County, Geology

The ground under Tuscola County

Predicted

USGS's geologic map splits Tuscola County: 66.9% of its land is low radon potential and 32.9% moderate. The map puts 66.9% of Tuscola County in the area it calls Glacial Lakes and 32.9% in South-Central Michigan Basin. USGS gives the first a radon index of 7, in the low band (5 to 8), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Tuscola County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glacial LakesSilt and clay glacial lake deposits.Low766.9%
South-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Moderate1032.9%

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

Tuscola County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Tuscola County's is. Of the 6 counties that border it, 3 have more moderate-potential ground, Lapeer County the most at 100%.

Share of land by USGS radon potential: Tuscola County, the 6 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Tuscola CountyZone 366.9%32.9%None
Lapeer CountyZone 2None100%None
Sanilac CountyZone 20.3%99.7%None
Saginaw CountyZone 3100%NoneNone
Genesee CountyZone 219.5%80.5%None
Huron CountyZone 377.4%21.2%None
Bay CountyZone 399.1%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

Tuscola County, Local resources

Radon testing and mitigation in Tuscola County

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

Tuscola County, Questions

Questions about radon in Tuscola County

Are radon levels high in Tuscola County?

Over the 2008 to 2017 laboratory totals, 35.5% of the radon tests reported to CDC for Tuscola County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.6 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 12 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Tuscola County?

Tuscola County borders 6 counties: Lapeer County, Sanilac County, Saginaw County, Genesee County, Huron County and Bay County.

Products

Tuscola County, Products

Testing a home in Tuscola County

In Tuscola County, 35.5% of 369 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Tuscola County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Tuscola County homes, compared

Explore

Tuscola County, Bordering counties

Counties bordering Tuscola County

Calculated by Radon411

Tuscola County, Cities and towns

Cities and towns in Tuscola County

About 52,680 people live in Tuscola County by the Census Bureau's estimate for July 1, 2025, 644 fewer than in 2020 (−1.2%). That works out to 65 people per square mile of land. No town dominates: Caro, the largest, has 4,258 residents, 8.1% of the total. Reported testing is thin here: 369 tests over 2008 to 2017, or 7.0 for every 1,000 residents (2025 estimate), where Michigan as a whole comes to 11.3.

From Caro to Gagetown, CDC publishes no figure by town: each reads Tuscola County's.

The cities and towns in Tuscola County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Caro4,258−1.4%8.1%
Vassar2,685−1.8%5.1%
Cass City2,487−1.2%4.7%
Reeseextends beyond Tuscola County1,265−1.6%Counted whole
Millington1,003−2.1%1.9%
Mayville904−1.8%1.7%
Fairgrove525−1.7%1.0%
Unionville481−2.0%0.9%
Kingston393−2.0%0.7%
Akron368−1.6%0.7%
Gagetown319−1.5%0.6%

11 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Tuscola County is counted whole, so it has no share.

Tuscola County, Homes

Homes in Tuscola County

Tuscola County is a place of houses on their own lots: 83% of its 24,005 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1970, close to Michigan's 1972: 40% date from before 1960 and 9% from 2000 or later. Owners live in 85% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.

Homes in Tuscola County, Michigan, 2019 to 2023
HomesTuscola CountyMichigan
Housing units24,0054,599,683
Detached houses83%72%
In buildings of 5 or more4%13%
Mobile homes9%5%
Built before 196040%36%
Built since 20009%15%
Middle year built19701972
Owner-occupied85%73%

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