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Radon Levels in Montmorency County, Michigan

EPA puts Montmorency County in Zone 2, its middle radon zone, and most reported tests there come back low, though 14.7% of 191 (2008 to 2017, laboratory totals) reached 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

    14.7%

    12.2 pts below MI

    Montmorency
    14.7%
    Michigan
    26.9%

    191 tests, 2008 to 2017

  • Median result

    1.6pCi/L

    Below action level

    Montmorency
    1.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    191

    67th of 82 by tests

    Montmorency
    191
    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

    53 of 82

    Middle half

    Montmorency
    14.7%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Montmorency County

Starts at Montmorency County's median, 1.6 pCi/L

1.6pCi/L

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

EPA’s reading of 1.6 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Montmorency County's median reported result, 2008 to 2017.

Interpret this reading

The data

Montmorency County, At a glance

Montmorency County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Montmorency 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 98% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Montmorency County, 2008 to 2017, laboratory
Under 2 pCi/L: 59%2 to 4 pCi/L: 26%4 pCi/L and above: 15%

Of 191 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Montmorency County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L11359.2%
2 to 4 pCi/L5026.2%
4 pCi/L and above2814.7%
What these figures count

These are the 191 tests reported to CDC for Montmorency 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

Montmorency County, Compared

Montmorency County radon figures, compared

Calculated by Radon411

Montmorency County reports fewer high tests than Michigan overall. 14.7% of its 191 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 12.2 points below the 26.9% pooled from 83 Michigan counties.

Ordered from highest share down, it comes 53rd of 82 Michigan counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Montmorency County sits 21.0 points below it.

Next door, the shares run from 6.2% in Crawford County to 38.2% in Otsego County, with Alpena County, Cheboygan County and Crawford County below Montmorency County. Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 14.7% share point the same way here.

Half the tests came in under 1.6 pCi/L and half over it; the single highest reached 25.1 pCi/L. The rest split 59.2% under 2 pCi/L and 26.2% from 2 to 4 (Michigan: 46.4% and 26.7%).

CDC's ten-year totals for Montmorency County went from 188 tests (2005 to 2014) to 191 (2008 to 2017), the share going from 15.4% to 14.7%.

Montmorency County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Montmorency County
Montmorency County19114.7%1.6 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+12.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+21.0 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+42.0 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−11.5 points
Otsego County, MIborders it1,08038.2%3.2 pCi/L+23.5 points
Presque Isle County, MIborders it50922.8%1.9 pCi/L+8.1 points
Alcona County, MIborders it18520.5%1.7 pCi/L+5.8 points
Oscoda County, MIborders it5418.5%2.1 pCi/L+3.8 points
Alpena County, MIborders it1,13913.3%0.9 pCi/L−1.4 points
Cheboygan County, MIborders it4658.0%0.8 pCi/L−6.7 points
Crawford County, MIborders it1946.2%1.3 pCi/L−8.5 points
Where Montmorency County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultMontmorency County testsMontmorency County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L11359.2%46.4%39.6%+12.8 points
2 to 4 pCi/L5026.2%26.7%24.7%−0.5 points
4 pCi/L and above2814.7%26.9%35.7%−12.2 points
Montmorency 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
Emmet County48 of 8281515.2%1.6 pCi/L
Schoolcraft County49 of 826615.2%0.6 pCi/L
Ogemaw County50 of 8212015.0%2.0 pCi/L
Lake County51 of 829414.9%1.4 pCi/L
Missaukee County52 of 8235014.9%1.6 pCi/L
Montmorency County53 of 8219114.7%1.6 pCi/L
Clare County54 of 8219814.1%1.6 pCi/L
St. Clair County55 of 8264113.7%1.5 pCi/L
Macomb County56 of 825,62913.4%1.6 pCi/L
Alpena County57 of 821,13913.3%0.9 pCi/L
Gogebic County58 of 8217112.9%1.2 pCi/L
Montmorency County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 201719114.7%1.6 pCi/L25.1 pCi/L26.9%+0.7 points
2007 to 201620014.0%1.7 pCi/L25.1 pCi/L26.8%−1.2 points
2006 to 201519115.2%1.7 pCi/L25.1 pCi/L26.8%−0.2 points
2005 to 201418815.4%1.8 pCi/L25.1 pCi/L26.2%First on file

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

Montmorency County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 4 ZIP codes that lie wholly or partly in Montmorency County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Montmorency County
ZIP codeWhat the state reports
4970928% greater than 4 pCi/L, median 2.2 pCi/L, 39 tests
4974611% greater than 4 pCi/L, median 1.3 pCi/L, 27 tests
4975113% greater than 4 pCi/L, median 1.9 pCi/L, 24 tests
4975626% greater than 4 pCi/L, median 2.7 pCi/L, 31 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.

Montmorency County, Geology

The ground under Montmorency County

Predicted

Most of the ground under Montmorency County is one class on USGS's geologic map: 97.9% of its land is moderate radon potential, with 2.1% low. 97.9% of it lies in the area the map calls Antrim Shale, to which USGS gives a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Montmorency County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Antrim ShaleGlacial deposits dervied in part from Antrim black shale.Moderate1097.9%
North-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Low82.1%

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

Montmorency County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Montmorency County's is. Of the 7 counties that border it, none has as large a share of moderate-potential ground; Alcona County comes nearest at 69.4%.

Share of land by USGS radon potential: Montmorency County, the 7 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Montmorency CountyZone 22.1%97.9%None
Oscoda CountyZone 383.5%16.5%None
Alpena CountyZone 230.5%68.4%None
Otsego CountyZone 236.2%63.8%None
Crawford CountyZone 3100%NoneNone
Presque Isle CountyZone 247.4%52.3%None
Alcona CountyZone 230.5%69.4%None
Cheboygan CountyZone 359.0%40.9%None
Michigan83 counties, pooled by land areaVaries45.0%44.3%9.6%

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

Local help

Montmorency County, Local resources

Radon testing and mitigation in Montmorency 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

Montmorency County, Questions

Questions about radon in Montmorency County

Are radon levels high in Montmorency County?

Over the 2008 to 2017 laboratory totals, 14.7% of the radon tests reported to CDC for Montmorency County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 52 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Montmorency County?

Montmorency County borders 7 counties: Oscoda County, Alpena County, Otsego County, Crawford County, Presque Isle County, Alcona County and Cheboygan County.

Products

Montmorency County, Products

Testing a home in Montmorency County

In Montmorency County, 14.7% of 191 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 Montmorency County; a long-term test tells the year-round average.

Test kits and monitors3

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Best radon monitors for Montmorency County homes, compared

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Montmorency County, Bordering counties

Counties bordering Montmorency County

Calculated by Radon411

Montmorency County, Cities and towns

Cities and towns in Montmorency County

Montmorency County is growing: the Census Bureau puts it at 9,842 residents on July 1, 2025, up 7.3% from 9,169 in 2020. That works out to 18 people per square mile of land. Hillman, the largest place on its list (666 residents in all), extends beyond Montmorency County, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 191 reported tests for 2008 to 2017 come to 19.4 for every 1,000 residents (2025 estimate), against 11.3 for Michigan.

Hillman is the one incorporated place here; CDC publishes no figure by town, so it reads Montmorency County's.

Hillman, Montmorency County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Hillmanextends beyond Montmorency County666+6.6%Counted whole

One incorporated place, 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 Montmorency County is counted whole, so it has no share.

Montmorency County, Homes

Homes in Montmorency County

Montmorency County is a place of houses on their own lots: 88% of its 8,926 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1975, close to Michigan's 1972: 26% date from before 1960 and 11% from 2000 or later. Owners live in 88% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.

Homes in Montmorency County, Michigan, 2019 to 2023
HomesMontmorency CountyMichigan
Housing units8,9264,599,683
Detached houses88%72%
In buildings of 5 or more2%13%
Mobile homes9%5%
Built before 196026%36%
Built since 200011%15%
Middle year built19751972
Owner-occupied88%73%

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