Listed for: Testing
Verified:Minnesota state license
No phone or website on the list. Licenses on the profile.
Locations and reports
Radon in Plymouth, Minnesota
EPA puts Hennepin County, where Plymouth is, in Zone 1, its highest radon zone, and 32.0% of its 6,545 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
32.0%
2.6 pts below MN
- Hennepin
- 32.0%
- Minnesota
- 34.6%
Hennepin, 49th of 62 in MN, 2023
Median result
2.7pCi/L
Below action level
- Hennepin
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Hennepin's tests, 2023
Nearest county
23.5%
Ramsey, 18 miles
- Ramsey
- 23.5%
- Hennepin
- 32.0%
2,213 tests, 2023
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Hennepin, where Plymouth is
Tests reported
6,545
In Hennepin
- Hennepin
- 6,545
- Ramsey
- 2,213
Reported to CDC before any fix, 2023
Read a result for Plymouth
Starts at Hennepin County's median, 2.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.7 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. Hennepin County's median reported result, 2023.
The data
Plymouth, What is published
What is published for Plymouth
Information:
Every figure for Plymouth is a county's
Radon data is published by county, not by city, so for Plymouth it is Hennepin County's: its EPA zone (Zone 1) and the 6,545 tests reported to CDC for 2023. Only a test tells you about one home.
Plymouth covers 32.7 square miles of land, all of it in Hennepin County. About 78,942 people live there, 2,413 to the square mile.
Plymouth, Counties
The county Plymouth lies in
MeasuredHennepin County's EPA zone and the figures CDC publishes for it, 2023.
Hennepin CountyZone 1Highest predicted potential
- 32.0%
- Reported tests at or above 4 pCi/L
- 2.7 pCi/L
- Median reported result
- 6,545 tests
- Tests reported to CDC
- 10
- Annual years on file
Hennepin County ranks 49th of 62 Minnesota counties with 30 or more tests for that period, 2.6 points below the 34.6% pooled across Minnesota's counties, 1.4 points below the national pool of 33.4%.
The counties nearest Plymouth with a CDC figure for 2023, measured from the middle of the city: Ramsey County (18 miles, 23.5% of 2,213 tests), Anoka County (20 miles, 19.3% of 880 tests) and Carver County (22 miles, 34.6% of 489 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 19.3% to 42.4%; the farthest of them, Sherburne County, is 33 miles away at 21.7%.
The directory lists 5 businesses with an address in Plymouth, 5 for testing and 1 for mitigation. Minnesota's other cities with a page of their own: Minneapolis, St. Paul, St. Cloud and Duluth.
The counties around Plymouth
By distance from the middle of Plymouth; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2023.
Plymouth, Geology
The ground under Plymouth
PredictedUSGS's geologic map puts all of Plymouth's mapped land in one class: high radon potential. All of it lies in the area the map calls Central Lowland-Till Prairie, to which USGS gives 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Plymouth beside its county and Minnesota
All of Plymouth, like all of Hennepin County, is rated high. Plymouth 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.
Plymouth, Homes
Homes in Plymouth
Of Plymouth's 33,718 homes, 57% are detached houses, against 52% across Hennepin County; 23% are in buildings of five or more homes. Much of Plymouth is recent building: 25% of its homes have gone up since 2000 and the middle year built is 1987, against 1973 for Hennepin County. 75% of occupied homes are lived in by their owner (Hennepin County: 63%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Plymouth | Hennepin County | Minnesota |
|---|---|---|---|
| Housing units | 33,718 | 564,441 | 2,519,538 |
| Detached houses | 57% | 52% | 66% |
| In buildings of 5 or more | 23% | 33% | 19% |
| Mobile homes | under 1% | under 1% | 3% |
| Built before 1960 | 6% | 36% | 29% |
| Built since 2000 | 25% | 18% | 22% |
| Middle year built | 1987 | 1973 | 1978 |
| Owner-occupied | 75% | 63% | 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
Plymouth, Professionals
Radon professionals listed in Plymouth
Businesses whose listed city is Plymouth, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Plymouth: 1 of 5
5 listings with Plymouth as the city. See radon mitigation and testing in Plymouth, or all radon professionals in Minnesota.
Plymouth, Local resources
Local resources for Plymouth
Who to ask in Minnesota: its radon program, test kits and professionals.
What it means
Plymouth, Questions
Questions about radon in Plymouth
What radon zone is Plymouth in?
Plymouth has no zone of its own: it shares Hennepin County's, Zone 1, the map's highest class: a predicted county average above 4 pCi/L.
What are radon levels in Plymouth?
A high result is no surprise around Plymouth: 32.0% of 6,545 tests reported from Hennepin County for 2023 reached 4 pCi/L or more. The median reported result was 2.7 pCi/L.
Should I test my home in Plymouth?
Yes. About 2,094 of the 6,545 tests reported from Hennepin County were at or above 4 pCi/L. That is below Minnesota's pooled 34.6%, and still not a reason to skip it, and ranks Hennepin County 49th of the 62 Minnesota counties with 30 or more tests. No map says which homes those are. How to test a home.
What ground is Plymouth built on, as far as radon goes?
USGS's geologic map puts all of Plymouth on one named area, "Central Lowland-Till Prairie", rated high for radon potential, radon index 14.
Is radon higher in the counties around Plymouth?
Some are and some are not. Against Hennepin County's 32.0%, 4 of the 8 nearest counties with a figure report more and 4 less, from Anoka County (19.3%, 20 miles off) to Wright County (42.4%, 27 miles off).
Who tests for or fixes radon in Plymouth?
Radon411's directory has 5 businesses with an address in Plymouth, 5 listed for testing and 1 for mitigation. Every entry names the public list it was taken from. Radon professionals in Plymouth.
The answers use the published figures of Hennepin County, the county Plymouth lies in.
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