Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Sanilac County, Michigan
EPA puts Sanilac County in Zone 2, its middle radon zone, and 16.6% of its 325 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
Share at 4+ pCi/L
16.6%
10.3 pts below MI
- Sanilac
- 16.6%
- Michigan
- 26.9%
325 tests, 2008 to 2017
Median result
1.6pCi/L
Below action level
- Sanilac
- 1.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
325
58th of 82 by tests
- Sanilac
- 325
- Oakland
- 16,224
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Michigan
42 of 82
Middle half
- Sanilac
- 16.6%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Sanilac County
Starts at Sanilac County's median, 1.6 pCi/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
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Sanilac County's median reported result, 2008 to 2017.
The data
Sanilac County, At a glance
Sanilac County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Sanilac County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Sanilac County, 2008 to 2017, laboratory
Under 2 pCi/L: 58%2 to 4 pCi/L: 25%4 pCi/L and above: 17%
Of 325 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 190 | 58.5% |
| 2 to 4 pCi/L | 81 | 24.9% |
| 4 pCi/L and above | 54 | 16.6% |
What these figures count
These are the 325 tests reported to CDC for Sanilac 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).
Sanilac County, Compared
Sanilac County radon figures, compared
Calculated by Radon411Sanilac County's 325 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.6 pCi/L and a maximum of 27.5 pCi/L, and 16.6% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 10.3 points higher than here.
Among its state's counties it ranks 42nd 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, 190 tests (58.5%) came in under 2 pCi/L, against 46.4% statewide, and 81 tests (24.9%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Sanilac County went from 271 tests (2005 to 2014) to 325 (2008 to 2017), the share going from 16.6% to 16.6%.
EPA's 1993 zone map puts Sanilac County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 13.7% in St. Clair County to 35.5% in Tuscola County, with St. Clair County below Sanilac County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sanilac County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Sanilac 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 Sanilac County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 21 ZIP codes that lie wholly or partly in Sanilac County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 48032 | 25% greater than 4 pCi/L, median 1.1 pCi/L, 8 tests |
| 48097 | 24% greater than 4 pCi/L, median 2.8 pCi/L, 17 tests |
| 48401 | 4 tests, figures not shown |
| 48416 | 0% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests |
| 48419 | 0% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests |
| 48422 | 14% greater than 4 pCi/L, median 1.1 pCi/L, 14 tests |
| 48426 | 4 tests, figures not shown |
| 48427 | 13% greater than 4 pCi/L, median 1.9 pCi/L, 8 tests |
| 48441 | 19% greater than 4 pCi/L, median 1.7 pCi/L, 36 tests |
| 48450 | 0% greater than 4 pCi/L, median 0.9 pCi/L, 7 tests |
| 48453 | 29% greater than 4 pCi/L, median 1.9 pCi/L, 7 tests |
| 48454 | 1 tests, figures not shown |
| 48456 | 4 tests, figures not shown |
| 48465 | 2 tests, figures not shown |
| 48466 | 2 tests, figures not shown |
| 48469 | 0% greater than 4 pCi/L, median 1.6 pCi/L, 8 tests |
| 48470 | 18% greater than 4 pCi/L, median 0.7 pCi/L, 11 tests |
| 48471 | 8% greater than 4 pCi/L, median 0.9 pCi/L, 24 tests |
| 48472 | 4 tests, figures not shown |
| 48475 | 48% greater than 4 pCi/L, median 3.7 pCi/L, 42 tests |
| 48726 | 43% greater than 4 pCi/L, median 3.5 pCi/L, 28 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.
Sanilac County, Geology
The ground under Sanilac County
PredictedMost of the ground under Sanilac County is one class on USGS's geologic map: 99.7% of its land is moderate radon potential, with 0.3% low. 95.8% of it lies in the area the map calls South-Central Michigan Basin, to which USGS gives a radon index of 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| South-Central Michigan Basin | Sandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites. | Moderate | 10 | 95.8% |
| Antrim Shale-Lake deposits | Antrim black shale covered by glacial lake deposits. | Moderate | 9 | 3.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sanilac County beside the ground around it
Across Michigan 9.6% of the land is rated high; none of Sanilac County's is. Of the 4 counties that border it, 1 has more moderate-potential ground, Lapeer County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Sanilac County, Local resources
Radon testing and mitigation in Sanilac County
- Michigan Indoor Radon ProgramMichigan Indoor Radon Program, run by Michigan Department of Environment, Great Lakes, and Energy, does not license radon professionals, and answers questions about testing and mitigation in Michigan.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Michigan69 professionals are listed in Michigan.
What Michigan's program says
- Phone
- 800-723-6642
- Radon@Michigan.gov
- Licensing of radon professionals
Michigan does not license or regulate radon testing and mitigation contractors.
What it means
Sanilac County, Questions
Questions about radon in Sanilac County
Are radon levels high in Sanilac County?
Over the 2008 to 2017 laboratory totals, 16.6% of the radon tests reported to CDC for Sanilac 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, 41 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Sanilac County?
Sanilac County borders 4 counties: Lapeer County, Tuscola County, Huron County and St. Clair County.
Products
Sanilac County, Products
Testing a home in Sanilac County
In Sanilac County, 16.6% of 325 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 Sanilac County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Monitor
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Sanilac County, Bordering counties
Counties bordering Sanilac County
Calculated by Radon411- Radon levels in Tuscola CountyEPA zone 3
35.5%at or above 4 pCi/L
Median 2.6 pCi/L · 369 tests · 18.9 points above Sanilac County
- Radon levels in Lapeer CountyEPA zone 2
33.4%at or above 4 pCi/L
Median 2.7 pCi/L · 649 tests · 16.8 points above Sanilac County
- Radon levels in Huron CountyEPA zone 3
26.5%at or above 4 pCi/L
Median 1.9 pCi/L · 260 tests · 9.9 points above Sanilac County
- Radon levels in St. Clair CountyEPA zone 3
13.7%at or above 4 pCi/L
Median 1.5 pCi/L · 641 tests · 2.9 points below Sanilac County
Sanilac County, Cities and towns
Cities and towns in Sanilac County
About 40,083 people live in Sanilac County by the Census Bureau's estimate for July 1, 2025, 416 fewer than in 2020 (−1.0%). That works out to 42 people per square mile of land. No town dominates: Sandusky, the largest, has 2,664 residents, 6.6% of the total. CDC's 325 reported tests for 2008 to 2017 work out to 8.1 per 1,000 residents (2025 estimate), close to Michigan's 11.3.
From Sandusky to Forestville, CDC publishes no figure by town: each reads Sanilac County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Sandusky | 2,664 | −1.4% | 6.6% |
| Croswell | 2,263 | −1.6% | 5.6% |
| Marlette | 1,833 | −1.0% | 4.6% |
| Brown Cityextends beyond Sanilac County | 1,280 | −1.5% | Counted whole |
| Lexington | 910 | −0.3% | 2.3% |
| Deckerville | 872 | −1.2% | 2.2% |
| Peck | 598 | −1.2% | 1.5% |
| Port Sanilac | 555 | −1.2% | 1.4% |
| Carsonville | 503 | −1.2% | 1.3% |
| Applegate | 227 | −1.3% | 0.6% |
| Minden City | 177 | −2.2% | 0.4% |
| Melvin | 152 | −1.3% | 0.4% |
- Forestville
13 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 Sanilac County is counted whole, so it has no share.
Sanilac County, Homes
Homes in Sanilac County
Sanilac County is a place of houses on their own lots: 82% of its 21,751 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1970, close to Michigan's 1972: 41% date from before 1960 and 13% from 2000 or later. Owners live in 82% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.
| Homes | Sanilac County | Michigan |
|---|---|---|
| Housing units | 21,751 | 4,599,683 |
| Detached houses | 82% | 72% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 10% | 5% |
| Built before 1960 | 41% | 36% |
| Built since 2000 | 13% | 15% |
| Middle year built | 1970 | 1972 |
| Owner-occupied | 82% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.