Listed for: TestingMitigation
Verified:Minnesota state license
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Locations and reports
Radon in St. Paul, Minnesota
EPA puts Ramsey County, where St. Paul is, in Zone 1, its highest radon zone, and 23.5% of its 2,213 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
23.5%
11.1 pts below MN
- Ramsey
- 23.5%
- Minnesota
- 34.6%
Ramsey, 54th of 62 in MN, 2023
Median result
2.2pCi/L
Below action level
- Ramsey
- 2.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Ramsey's tests, 2023
Nearest county
21.3%
Washington, 12 miles
- Washington
- 21.3%
- Ramsey
- 23.5%
1,518 tests, 2023
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Ramsey, where St. Paul is
Tests reported
2,213
In Ramsey
- Ramsey
- 2,213
- Washington
- 1,518
Reported to CDC before any fix, 2023
Read a result for St. Paul
Starts at Ramsey County's median, 2.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.2 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Ramsey County's median reported result, 2023.
The data
St. Paul, What is published
What is published for St. Paul
Information:
Every figure for St. Paul is a county's
Radon data is published by county, not by city, so for St. Paul it is Ramsey County's: its EPA zone (Zone 1) and the 2,213 tests reported to CDC for 2023. Only a test tells you about one home.
St. Paul covers 52 square miles of land, all of it in Ramsey County. Its 306,684 residents live 5,901 to the square mile.
St. Paul, Counties
The county St. Paul lies in
MeasuredRamsey County's EPA zone and the figures CDC publishes for it, 2023.
Ramsey CountyZone 1Highest predicted potential
- 23.5%
- Reported tests at or above 4 pCi/L
- 2.2 pCi/L
- Median reported result
- 2,213 tests
- Tests reported to CDC
- 10
- Annual years on file
Ramsey County ranks 54th of 62 Minnesota counties with 30 or more tests for that period, 11.1 points below the 34.6% pooled across Minnesota's counties, 9.9 points below the national pool of 33.4%.
The counties nearest St. Paul with a CDC figure for 2023, measured from the middle of the city: Washington County (12 miles, 21.3% of 1,518 tests), Hennepin County (19 miles, 32.0% of 6,545 tests) and Dakota County (19 miles, 34.6% of 2,183 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 19.3% to 49.5%; the farthest of them, Goodhue County, is 42 miles away at 49.5%.
The directory lists 14 businesses with an address in St. Paul, 14 for testing and 2 for mitigation. Minnesota's other cities with a page of their own: Minneapolis, Plymouth, St. Cloud and Duluth.
The counties around St. Paul
By distance from the middle of St. Paul; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2023.
St. Paul, Geology
The ground under St. Paul
PredictedUSGS's geologic map puts all of St. Paul's mapped land in one class: high radon potential. The map puts 63.3% of St. Paul in the area it calls Central Lowland-Till Prairie and 36.7% in Central Lowland-Western Lake Section. USGS gives both a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Lowland-Till Prairie | Silty and clayey till derived from shale and sandstone. | High | 14 | 63.3% |
| Central Lowland-Western Lake Section | Red sandy till derived primarily from sandstone. | High | 14 | 36.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
St. Paul beside its county and Minnesota
All of St. Paul, like all of Ramsey County, is rated high. St. Paul has more high-potential ground than Minnesota as a whole: 100% of its land against 61.1%.
The map rates the ground, not the air in any home.
St. Paul, Homes
Homes in St. Paul
St. Paul has 131,376 homes, and many share a building: 37% are in buildings of five or more, 49% are detached houses, against 52% across Ramsey County. The homes are older than Ramsey County's as a whole: half were built before 1952 (1965 for Ramsey County), and 60% date from before 1960. 53% of occupied homes are lived in by their owner (Ramsey County: 61%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | St. Paul | Ramsey County | Minnesota |
|---|---|---|---|
| Housing units | 131,376 | 231,606 | 2,519,538 |
| Detached houses | 49% | 52% | 66% |
| In buildings of 5 or more | 37% | 32% | 19% |
| Mobile homes | under 1% | 1% | 3% |
| Built before 1960 | 60% | 44% | 29% |
| Built since 2000 | 10% | 12% | 22% |
| Middle year built | 1952 | 1965 | 1978 |
| Owner-occupied | 53% | 61% | 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
St. Paul, Professionals
Radon professionals listed in St. Paul
Businesses whose listed city is St. Paul, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in St. Paul: 1 of 6
14 listings with St. Paul as the city. See radon mitigation and testing in St. Paul, or all radon professionals in Minnesota.
St. Paul, Local resources
Local resources for St. Paul
Who to ask in Minnesota: its radon program, test kits and professionals.
What it means
St. Paul, Questions
Questions about radon in St. Paul
What radon zone is St. Paul in?
St. Paul has no zone of its own: it shares Ramsey County's, Zone 1, the map's highest class: a predicted county average above 4 pCi/L.
What are radon levels in St. Paul?
Ramsey County's 2,213 tests for 2023 put 23.5% at or above 4 pCi/L: most tests near St. Paul come back under EPA's action level, but not all. The median reported result was 2.2 pCi/L.
Should I test my home in St. Paul?
Yes. Roughly one reported test in 4 in Ramsey County reached 4 pCi/L. That is below Minnesota's pooled 34.6%, and still not a reason to skip it, and ranks Ramsey County 54th 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 St. Paul built on, as far as radon goes?
63.3% of St. Paul sits on what USGS's map calls "Central Lowland-Till Prairie", rated high for radon potential, radon index 14; another 36.7% is "Central Lowland-Western Lake Section", in the same class.
Is radon higher in the counties around St. Paul?
Some are and some are not. Against Ramsey County's 23.5%, 6 of the 8 nearest counties with a figure report more and 2 less, from Anoka County (19.3%, 24 miles off) to Goodhue County (49.5%, 42 miles off).
Who tests for or fixes radon in St. Paul?
Radon411's directory has 14 businesses with an address in St. Paul, 14 listed for testing and 2 for mitigation. Every entry names the public list it was taken from. Radon professionals in St. Paul.
The answers use the published figures of Ramsey County, the county St. Paul lies in.
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