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Radon Levels in Hillsdale County, Michigan

EPA puts Hillsdale County in Zone 1, its highest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

Predicted
Zone 1Highest predicted potential
Measured
54.8%of 2,086 tests reported to CDC (2008 to 2017) were at or above 4 pCi/L
Your home
Test to knowNo area figure here is a reading of your home.
How to test this homeFind a certified tester

The data

Hillsdale County, At a glance

Hillsdale County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.

What EPA predicts hereScreening level, geology

EPA predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county as a whole.

USGS geologic potential: High across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Tests reported
2,086
At or above 4 pCi/L
54.8%
Median result
4.4 pCi/L
Reported results by concentration band, Hillsdale County, 2008 to 2017, laboratory
Under 2 pCi/L: 23%2 to 4 pCi/L: 22%4 pCi/L and above: 55%

Of 2,086 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Hillsdale County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L47923.0%
2 to 4 pCi/L46322.2%
4 pCi/L and above1,14454.8%

CDC publishes this figure only for counties here, so there is no state or national number to compare Hillsdale County, Michigan with.

What these figures count

Distribution of radon tests reported to CDC, not this house. People testing before a sale, or because they suspect a problem, are over-represented in any reported testing data.

The figures at the top are for 2008 to 2017 (laboratory totals): a percentage there is a share of radon tests reported to CDC for Hillsdale County over 2008 to 2017, laboratory, and a percentage in a view below is a share of the tests reported for the year or period it names. It is not a share of homes in Hillsdale County, and it is not a random sample: it counts only the tests people chose to run and that were reported.

CDC works out the shares and the median over pre-mitigation tests, counting a test not marked as before or after mitigation as one of them (2,086 for 2008 to 2017, laboratory). The median is the middle result of those tests, not of buildings. CDC also reports the number of buildings tested (1,177), a different count, so the two totals are not interchangeable.

Hillsdale County's own published CDC figures beside those of the counties that border it, for the same period.

Each figure is that county’s own published CDC figure for 2008 to 2017, laboratory, counting radon tests reported to CDC, not homes. Hillsdale County is this page. Nothing is averaged or combined across counties. The test count beside each county is CDC’s published number of pre-mitigation tests behind its figures. Figures from few tests can swing widely from year to year. Every Michigan county’s own figure is in the Michigan county table.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

Hillsdale County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 17 ZIP codes that lie wholly or partly in Hillsdale County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Hillsdale County
ZIP codeWhat the state reports
4908236% greater than 4 pCi/L, median 3.3 pCi/L, 45 tests
4922059% greater than 4 pCi/L, median 4.3 pCi/L, 22 tests
4922747% greater than 4 pCi/L, median 3.6 pCi/L, 15 tests
4923219% greater than 4 pCi/L, median 2.7 pCi/L, 16 tests
4923362% greater than 4 pCi/L, median 5.2 pCi/L, 29 tests
4924243% greater than 4 pCi/L, median 3.0 pCi/L, 248 tests
4924662% greater than 4 pCi/L, median 6.6 pCi/L, 29 tests
4924755% greater than 4 pCi/L, median 4.5 pCi/L, 31 tests
4924962% greater than 4 pCi/L, median 5.5 pCi/L, 34 tests
4925052% greater than 4 pCi/L, median 4.6 pCi/L, 88 tests
4925254% greater than 4 pCi/L, median 4.6 pCi/L, 26 tests
4925564% greater than 4 pCi/L, median 4.3 pCi/L, 11 tests
4926214% greater than 4 pCi/L, median 2.9 pCi/L, 7 tests
4926656% greater than 4 pCi/L, median 4.5 pCi/L, 34 tests
4927136% greater than 4 pCi/L, median 2.6 pCi/L, 22 tests
4927421% greater than 4 pCi/L, median 2.2 pCi/L, 29 tests
4928871% greater than 4 pCi/L, median 7.1 pCi/L, 7 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.

Radon Action Brief

National Radon Action MonthPre-sale

Hillsdale County's radon brief, in one dated file.

  • Your area's radon record, explained.
  • Your plan to test this week.
  • Fix costs and pros near you.

Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25

Get the Hillsdale County BriefSee a free sample

Area data, not a test of the building.

Local help

Hillsdale County, Local resources

Radon testing and mitigation in Hillsdale County

Who tests and fixes radon in Hillsdale County: listed businesses, Michigan's radon program and test kits.

Listed radon businesses with an address in Hillsdale County:

Listed radon professionals by town: Jonesville

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

Hillsdale County, Questions

Questions about radon in Hillsdale County

Common questions

8 questions, answered from the figures above

Who does radon mitigation in Hillsdale County?

No listed mitigator names Hillsdale County as a service area yet; the Michigan directory lists 69 companies. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional. Your state radon program is the place to check whether Michigan requires one.

Radon mitigation: how it worksRadon mitigation costRadon mitigation systemsMitigators in Michigan

Are radon levels high in Hillsdale County?

Over the 2008 to 2017 laboratory totals, 54.8% of the radon tests reported to CDC for Hillsdale County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.4 pCi/L. That is a share of reported tests, not of homes. EPA places Hillsdale County in Zone 1, highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. Homes with elevated levels occur in all three zones, so the figures describe the area, not your house. Testing is the only way to know the radon level in a specific building.

Radon levels: what a result meansWhat is radon?Radon levels in Michigan

How do I get a radon test in Hillsdale County?

EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. No radon testing business listed on Radon411 has an address in Hillsdale County or names it as a service area yet. The Michigan radon program is the place to ask about certified testers and any test kit offer it runs.

Radon testing: how to test a homeRadon test kits comparedFree and low-cost kits by stateRadon Action Month checklistMichigan radon program

What EPA radon zone is Hillsdale County in?

EPA places Hillsdale County, Michigan in Zone 1, which EPA describes as highest predicted potential for the area. A zone is a prediction for the whole county and never determines whether a particular home should be tested. EPA recommends testing every home regardless of zone.

Should I test my home in Hillsdale County?

Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.

When is the best time of year to test?

EPA says short-term tests stay in the home from 2 to 90 days and that all radon tests should run a minimum of 48 hours; long-term tests stay more than 90 days. EPA's guides do not name a best season: they say radon levels tend to vary from day to day and season to season, so a long-term test is more likely than a short-term test to tell you the year-round average.

What does it cost to test?

EPA's Citizen's Guide calls testing easy and inexpensive, and EPA's Home Buyer's and Seller's Guide says passive short-term and long-term devices are generally inexpensive, while active devices may cost more. No national average price is published for this, so Radon411 does not give one. What testing costs.

Which counties border Hillsdale County?

Hillsdale County borders 7 counties, derived from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county's report can be relevant.

If you own, buy, sell or rent

What these figures mean for each reader, with the guide that covers it

The reported-test figures on this page describe Hillsdale County, Michigan over the 2008 to 2017 laboratory totals. They describe tests other people carried out in other buildings, and none of them measures yours.

Hillsdale County in figures

The figures above, said in words

What the published data says about Hillsdale County, in words. A zone and a share of tests describe an area, never the level in any one home.

    • Predicted

      Predicted

      EPA places Hillsdale County in Zone 1, highest predicted potential, as it does 8 other counties of Michigan's 83.

      Of the 7 bordering counties, EPA places Branch County, Calhoun County, Jackson County, Lenawee County and Steuben County, IN in Zone 1 and Fulton County, OH and Williams County, OH in Zone 2.

  • Reported tests

    Measured

    CDC publishes no annual figure for Hillsdale County; its figure is a laboratory total for 2008 to 2017: 54.8% of 2,086 reported tests were at or above 4 pCi/L.

  • Local record

    Michigan's radon program is the Michigan Indoor Radon Program, run by Michigan Department of Environment, Great Lakes, and Energy; its contacts are under Local resources.

    The county's largest incorporated places are Hillsdale, Jonesville and Litchfield; the figures here cover them as part of the county.

Products

Hillsdale County, Products

Testing and mitigation products

Whatever the figures for Hillsdale County show, only a test tells you about one home.

Test kits and monitors42

See all products

As an Amazon Associate, Radon411 earns from qualifying purchases.

Hillsdale County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Hillsdale County

Testing

5

Mitigation

3

Explore

Hillsdale County, Bordering counties

Counties bordering Hillsdale County

Calculated by Radon411
Why bordering counties matter

7 counties share a boundary with Hillsdale County, computed from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county’s report can be worth reading alongside this one.

Hillsdale County, Cities and towns

Cities and towns in Hillsdale County

The radon figures on this page are for Hillsdale County as a whole. They do not differ by city or town.

  • Hillsdale
  • Jonesville
  • Litchfield
  • Reading
  • Waldron
  • Camden
  • North Adams
  • Montgomery
  • Allen

9 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files.

Hillsdale County, Next steps

What to do next

  1. LearnKnow what radon isWhat radon is, how it gets indoors, and why a county zone is not a reading for your home.Learn about radon
  2. TestTest the building you live inShort-term or long-term, where the device goes, and closed-house conditions.How to test
  3. FixBring a high level downHow a mitigation system works, and the retest that confirms it.How mitigation works
  4. Find a proHire a certified professionalMeasurement and mitigation professionals by state, with their certifications.Find a professional

Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.