Listed for: Mitigation
Verified:Minnesota state license
No phone listedWebsite of Adamski Builders LLC (opens in a new tab)
Locations and reports
Radon in Duluth, Minnesota
EPA puts St. Louis County, where Duluth is, in Zone 2, its middle radon zone, and 20.2% of its 496 reported radon tests (2023) 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
20.2%
14.4 pts below MN
- St. Louis
- 20.2%
- Minnesota
- 34.6%
St. Louis, 59th of 62 in MN, 2023
Median result
1.7pCi/L
Below action level
- St. Louis
- 1.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of St. Louis's tests, 2023
Nearest county
41.9%
Carlton, 29 miles
- Carlton
- 41.9%
- St. Louis
- 20.2%
105 tests, 2023
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
St. Louis, where Duluth is
Tests reported
496
In St. Louis
- St. Louis
- 496
- Carlton
- 105
Reported to CDC before any fix, 2023
Read a result for Duluth
Starts at St. Louis 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. St. Louis County's median reported result, 2023.
The data
Duluth, What is published
What is published for Duluth
Information:
Every figure for Duluth is a county's
Radon data is published by county, not by city, so for Duluth it is St. Louis County's: its EPA zone (Zone 2) and the 496 tests reported to CDC for 2023. Only a test tells you about one home.
Duluth covers 71.7 square miles of land, all of it in St. Louis County. About 88,330 people live there, 1,232 to the square mile.
Duluth, Counties
The county Duluth lies in
MeasuredSt. Louis County's EPA zone and the figures CDC publishes for it, 2023.
St. Louis CountyZone 2Moderate predicted potential
- 20.2%
- Reported tests at or above 4 pCi/L
- 1.7 pCi/L
- Median reported result
- 496 tests
- Tests reported to CDC
- 10
- Annual years on file
St. Louis County ranks 59th of 62 Minnesota counties with 30 or more tests for that period, 14.4 points below the 34.6% pooled across Minnesota's counties, 13.2 points below the national pool of 33.4%.
The counties nearest Duluth with a CDC figure for 2023, measured from the middle of the city: Carlton County (29 miles, 41.9% of 105 tests), Pine County (54 miles, 39.6% of 48 tests) and Aitkin County (62 miles, 38.7% of 31 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 3.8% to 41.9%; the farthest of them, Isanti County, is 101 miles away at 22.7%.
The directory lists 3 businesses with an address in Duluth, 2 for testing and 1 for mitigation. Minnesota's other cities with a page of their own: Minneapolis, St. Paul, Plymouth and St. Cloud.
The counties around Duluth
By distance from the middle of Duluth; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2023.
Duluth, Geology
The ground under Duluth
PredictedUSGS's geologic map puts all of Duluth's mapped land in one class: moderate radon potential. The map puts 93.6% of Duluth in the area it calls Superior Upland/Central Lowland-Western Lake Section and 1.2% in Superior Lobe. USGS gives both 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 |
|---|---|---|---|---|
| Superior Upland/Central Lowland-Western Lake Section | Glacial deposits derived primarily from volcanic rock. | Moderate | 10 | 93.6% |
| Superior Lobe | Glacial deposits derived from sandstone and volcanic rocks. | Moderate | 10 | 1.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Duluth beside its county and Minnesota
The ground under Duluth is close to St. Louis County's as a whole: 94.7% rated moderate against 99.9%. Across Minnesota 61.1% of the land is rated high; none of Duluth's is.
The map rates the ground, not the air in any home.
Duluth, Homes
Homes in Duluth
Of Duluth's 39,805 homes, 60% are detached houses, against 74% across St. Louis County; 21% are in buildings of five or more homes. The homes are older than St. Louis County's as a whole: half were built before 1951 (1962 for St. Louis County), and 61% date from before 1960. 60% of occupied homes are lived in by their owner (St. Louis County: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Duluth | St. Louis County | Minnesota |
|---|---|---|---|
| Housing units | 39,805 | 103,924 | 2,519,538 |
| Detached houses | 60% | 74% | 66% |
| In buildings of 5 or more | 21% | 13% | 19% |
| Mobile homes | 3% | 4% | 3% |
| Built before 1960 | 61% | 48% | 29% |
| Built since 2000 | 12% | 14% | 22% |
| Middle year built | 1951 | 1962 | 1978 |
| Owner-occupied | 60% | 72% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Duluth, Professionals
Radon professionals listed in Duluth
Businesses whose listed city is Duluth, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Duluth: 1 of 3
3 listings with Duluth as the city. See radon mitigation and testing in Duluth, or all radon professionals in Minnesota.
Duluth, Local resources
Local resources for Duluth
Who to ask in Minnesota: its radon program, test kits and professionals.
What it means
Duluth, Questions
Questions about radon in Duluth
What radon zone is Duluth in?
Duluth takes its zone from St. Louis County, which EPA puts in Zone 2, the map's middle class: a predicted county average of 2 to 4 pCi/L.
What are radon levels in Duluth?
St. Louis County's 496 tests for 2023 put 20.2% at or above 4 pCi/L: most tests near Duluth come back under EPA's action level, but not all. The median reported result was 1.7 pCi/L.
Should I test my home in Duluth?
Yes. Roughly one reported test in 5 in St. Louis County reached 4 pCi/L. That is below Minnesota's pooled 34.6%, and still not a reason to skip it, and ranks St. Louis County 59th of the 62 Minnesota counties with 30 or more tests. Only a test puts a number on one house. How to test a home.
What ground is Duluth built on, as far as radon goes?
93.6% of Duluth sits on what USGS's map calls "Superior Upland/Central Lowland-Western Lake Section", rated moderate for radon potential, radon index 10; another 1.2% is "Superior Lobe", in the same class.
Is radon higher in the counties around Duluth?
Some are and some are not. Against St. Louis County's 20.2%, 7 of the 8 nearest counties with a figure report more and 1 less, from Lake County (3.8%, 68 miles off) to Carlton County (41.9%, 29 miles off).
Who tests for or fixes radon in Duluth?
Radon411's directory has 3 businesses with an address in Duluth, 2 listed for testing and 1 for mitigation. Every entry names the public list it was taken from. Radon professionals in Duluth.
The answers use the published figures of St. Louis County, the county Duluth lies in.
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