Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Delta County, Michigan
EPA puts Delta County in Zone 3, its lowest radon zone, and 21.5% of its 711 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
21.5%
5.4 pts below MI
- Delta
- 21.5%
- Michigan
- 26.9%
711 tests, 2008 to 2017
Median result
1.7pCi/L
Below action level
- Delta
- 1.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
711
35th of 82 by tests
- Delta
- 711
- Oakland
- 16,224
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Michigan
32 of 82
Middle half
- Delta
- 21.5%
- Lenawee
- 56.7%
By share, of 82 with 30+ tests
Read a result for Delta County
Starts at Delta County's median, 1.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.7 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. Delta County's median reported result, 2008 to 2017.
The data
Delta County, At a glance
Delta County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 57% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Delta County, 2008 to 2017, laboratory
Under 2 pCi/L: 54%2 to 4 pCi/L: 24%4 pCi/L and above: 22%
Of 711 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 386 | 54.3% |
| 2 to 4 pCi/L | 172 | 24.2% |
| 4 pCi/L and above | 153 | 21.5% |
What these figures count
These are the 711 tests reported to CDC for Delta 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).
Delta County, Compared
Delta County radon figures, compared
Calculated by Radon411Delta County's 711 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.7 pCi/L and a maximum of 105.5 pCi/L, and 21.5% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 5.4 points higher than here.
Among its state's counties it ranks 32nd 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, 386 tests (54.3%) came in under 2 pCi/L, against 46.4% statewide, and 172 tests (24.2%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Delta County went from 709 tests (2005 to 2014) to 711 (2008 to 2017), the share going from 17.1% to 21.5%.
EPA's 1993 zone map puts Delta County in Zone 3, a predicted county average under 2 pCi/L. USGS geology rates 57% of the county's land low radon potential.
Next door, the shares run from 11.7% in Menominee County to 23.4% in Marquette County, with Alger County, Schoolcraft County and Menominee County below Delta County.
CDC also counts 16 tests taken after mitigation in Delta County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Delta County, State data
Michigan's own radon test data
MeasuredWhat Michigan's own agencies publish about radon tests in Delta 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 Delta County
Michigan EGLE publishes its figures by ZIP code, not by county. These are the 12 ZIP codes that lie wholly or partly in Delta County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.
| ZIP code | What the state reports |
|---|---|
| 49807 | 18% greater than 4 pCi/L, median 1.9 pCi/L, 50 tests |
| 49817 | 43% greater than 4 pCi/L, median 2.5 pCi/L, 7 tests |
| 49818 | 31% greater than 4 pCi/L, median 2.7 pCi/L, 13 tests |
| 49829 | 7% greater than 4 pCi/L, median 1.4 pCi/L, 193 tests |
| 49835 | 22% greater than 4 pCi/L, median 0.8 pCi/L, 9 tests |
| 49837 | 35% greater than 4 pCi/L, median 2.8 pCi/L, 197 tests |
| 49854 | 6% greater than 4 pCi/L, median 0.9 pCi/L, 66 tests |
| 49872 | 2 tests, figures not shown |
| 49878 | 8% greater than 4 pCi/L, median 1.6 pCi/L, 60 tests |
| 49880 | 38% greater than 4 pCi/L, median 3.1 pCi/L, 16 tests |
| 49894 | 6% greater than 4 pCi/L, median 2.6 pCi/L, 17 tests |
| 49895 | 29% greater than 4 pCi/L, median 1.5 pCi/L, 14 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.
Delta County, Geology
The ground under Delta County
PredictedUSGS's geologic map splits Delta County: 57.2% of its land is low radon potential and 41.5% moderate. The map puts 57.2% of Delta County in the area it calls Glacial Lakes and 41.5% in Outer 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).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Glacial Lakes | Silt and clay glacial lake deposits. | Low | 7 | 57.2% |
| Outer Michigan Basin | Glacial deposits derived from Paleozoic carbonate rocks and sandstones. | Moderate | 10 | 41.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Delta County beside the ground around it
Across Michigan 9.6% of the land is rated high; none of Delta County's is. Of the 4 counties that border it, 3 have more moderate-potential ground, Marquette County the most at 99.9%.
The map rates the ground, not the air in any home.
Local help
Delta County, Local resources
Radon testing and mitigation in Delta 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
Delta County, Questions
Questions about radon in Delta County
Are radon levels high in Delta County?
Over the 2008 to 2017 laboratory totals, 21.5% of the radon tests reported to CDC for Delta County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 31 reported a higher share; pooled, the state comes to 26.9%.
Which counties border Delta County?
Delta County borders 4 counties: Menominee County, Alger County, Schoolcraft County and Marquette County.
Products
Delta County, Products
Testing a home in Delta County
In Delta County, 21.5% of 711 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 Delta County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Delta County, Bordering counties
Counties bordering Delta County
Calculated by Radon411- Radon levels in Marquette CountyEPA zone 2
23.4%at or above 4 pCi/L
Median 2.0 pCi/L · 1,082 tests · 1.9 points above Delta County
- Radon levels in Alger CountyEPA zone 2
16.4%at or above 4 pCi/L
Median 1.2 pCi/L · 189 tests · 5.1 points below Delta County
- Radon levels in Schoolcraft CountyEPA zone 3
15.2%at or above 4 pCi/L
Median 0.6 pCi/L · 66 tests · 6.3 points below Delta County
- Radon levels in Menominee CountyEPA zone 2
11.7%at or above 4 pCi/L
Median 1.2 pCi/L · 120 tests · 9.8 points below Delta County
Delta County, Cities and towns
Cities and towns in Delta County
About 36,582 people live in Delta County by the Census Bureau's estimate for July 1, 2025, 295 fewer than in 2020 (−0.8%). That works out to 31 people per square mile of land. Its largest town, Escanaba, has 12,257 residents, 33.5% of the total. Together its 3 incorporated places hold 48.2% of those residents; the other 51.8% live outside any of them. Testing is reported here more often than across the state: CDC's 711 reported tests for 2008 to 2017 come to 19.4 for every 1,000 residents (2025 estimate), against 11.3 for Michigan.
From Escanaba to Garden, CDC publishes no figure by town: each reads Delta County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Escanaba | 12,257 | −1.2% | 33.5% |
| Gladstone | 5,189 | −0.7% | 14.2% |
| Garden | 187 | −1.1% | 0.5% |
3 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).
Delta County, Homes
Homes in Delta County
Delta County is a place of houses on their own lots: 78% of its 19,841 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1968, close to Michigan's 1972: 43% date from before 1960 and 11% from 2000 or later. Owners live in 79% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.
| Homes | Delta County | Michigan |
|---|---|---|
| Housing units | 19,841 | 4,599,683 |
| Detached houses | 78% | 72% |
| In buildings of 5 or more | 8% | 13% |
| Mobile homes | 7% | 5% |
| Built before 1960 | 43% | 36% |
| Built since 2000 | 11% | 15% |
| Middle year built | 1968 | 1972 |
| Owner-occupied | 79% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.