Is radon high in St. Paul, Minnesota?

Low. Averaging the model's ZIP-code predictions across St. Paul (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 2.0 pCi/L - close to the US average of 1.8 and about 19% below the Minnesota average of 2.4. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. St. Paul ranks 14 of 23 Minnesota cities on this site.

What do actual radon tests show around St. Paul?

Minnesota Department of Health (MN Public Health Data Access) publishes results for Ramsey County (not the city alone) covering 2016-2025 (about 2,551 properties tested per year): an average of 3.0 pCi/L, a median of 2.4, 26.8% of results at or above the 4 pCi/L action level. These are voluntary home tests, so they skew toward basements and toward homes where radon was suspected; the model's predicted basement average for St. Paul is 2.0 pCi/L.

Which St. Paul ZIP codes have the highest radon?

Predictions for the 13 modeled ZIP codes in St. Paul range from 1.6 to 2.3 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 46% at or above 2. The city is fairly uniform, so the city-wide number is a reasonable guide for any neighborhood.

Should I test for radon in St. Paul?

Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; St. Paul's low predicted average describes the typical home, not yours.

What does EPA Radon Zone 1 mean for St. Paul?

St. Paul sits mainly in Ramsey County, which the EPA classifies as Zone 1 - highest potential (predicted average > 4 pCi/L). The zone map dates from 1993 and covers whole counties. The newer model's city average of 2.0 pCi/L does not line up with Zone 1, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

Radon levels in St. Paul, Minnesota

LowEPA Zone 1

Predicted long-term basement average of 2.0 pCi/L (model estimate) across the 13 modeled ZIP codes in St. Paul - close to the US average of 1.8, about 19% below the Minnesota average of 2.4. Ranked #14 of 23 Minnesota cities on this site. Most of the city lies in Ramsey County.

Test St. Paul, MN once anyway - radon varies house to house

The predicted basement average here is 2.0 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.

Get a short-term test kit →Or track it with a continuous monitor

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Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. Measured state test results are shown separately below, labeled with their source and years. How the numbers work.

2.0 ± 0.06

pCi/L predicted basement mean (model SD)

1.3 ± 0.07

pCi/L predicted upstairs (above-ground) mean

1.6-2.3

range of ZIP-level basement predictions in the city

of St. Paul ZIPs predicted ≥ 4 pCi/L (46% ≥ 2)

Measured radon tests in Ramsey County (Minnesota Department of Health (MN Public Health Data Access), 2016-2025)

Actual results from home radon tests reported to the state, separate from the model estimate above. Coverage: 2016-2025.

Measured mean: 3.0 pCi/L
Measured median: 2.4 pCi/L
Results ≥ 4 pCi/L: 26.8%
Results ≥ 2 pCi/L: 64.5%
Sample: about 2,551 properties tested per year

Figure	Model (predicted)	State tests (measured)
Mean, pCi/L	2.0 basement	3.0
Share ≥ 4 pCi/L	not a model output	26.8%

The measured mean runs 1.0 pCi/L above the model because state test data is voluntary and skews toward basements, winter, and homeowners who already suspected a problem, while the model estimates the long-term average across all homes.

Source: Minnesota radon test results by county, Minnesota Department of Health (MN Public Health Data Access). Minnesota public data (Minn. Stat. ch. 13). Method and download.

What this means for St. Paul

The typical St. Paul home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.6 to 2.3 pCi/L.

The city figure is not a separate estimate: it is the mean of the model's ZIP-code predictions, weighted by the share of the city's land in each ZIP (Census 2020 ZCTA-to-place relationship file). Note that the EPA classifies Ramsey County as Zone 1 while the newer model predicts 2.0 pCi/L for St. Paul; where they disagree, we grade on the model but show both.

Comparable Minnesota cities: Plymouth (2.0), Brooklyn Park (1.9), Minneapolis (2.1), Eden Prairie (2.1).

ZIP codes in St. Paul

ZIPs that overlap the city, largest share of its land first. Predicted basement and upstairs means are model estimates; ZIPs the model does not cover show a dash.

ZIP	Share of city	Basement	Upstairs	Grade
55106	18%	2.0 ± 0.06	1.3	Moderate
55119	13%	1.9 ± 0.06	1.3	Low
55104	12%	2.0 ± 0.06	1.3	Low
55116	11%	2.0 ± 0.06	1.5	Moderate
55117	8%	2.2 ± 0.06	1.5	Moderate
55107	8%	2.0 ± 0.06	1.3	Moderate
55105	7%	2.1 ± 0.06	1.3	Moderate
55102	6%	1.6 ± 0.10	1.2	Low
55108	6%	2.3 ± 0.06	1.6	Moderate
55130	4%	1.8 ± 0.06	1.2	Low
55103	4%	2.0 ± 0.06	1.4	Low
55114	3%	2.0 ± 0.06	1.4	Low
55101	2%	1.6 ± 0.08	1.2	Low
55155	<1%	—	—	no model

Testing help in Minnesota

Minnesota's radon program page is at www.health.state.mn.us; it lists testing and certified-mitigator guidance. EPA state radon contacts page. If a test comes back at 4 pCi/L or higher, mitigation typically costs $800-$2,500 installed; use EPA find-a-professional and read the mitigation guide.

St. Paul radon questions

Is radon high in St. Paul, Minnesota?: Low. Averaging the model's ZIP-code predictions across St. Paul (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 2.0 pCi/L - close to the US average of 1.8 and about 19% below the Minnesota average of 2.4. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. St. Paul ranks 14 of 23 Minnesota cities on this site.
What do actual radon tests show around St. Paul?: Minnesota Department of Health (MN Public Health Data Access) publishes results for Ramsey County (not the city alone) covering 2016-2025 (about 2,551 properties tested per year): an average of 3.0 pCi/L, a median of 2.4, 26.8% of results at or above the 4 pCi/L action level. These are voluntary home tests, so they skew toward basements and toward homes where radon was suspected; the model's predicted basement average for St. Paul is 2.0 pCi/L.
Which St. Paul ZIP codes have the highest radon?: Predictions for the 13 modeled ZIP codes in St. Paul range from 1.6 to 2.3 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 46% at or above 2. The city is fairly uniform, so the city-wide number is a reasonable guide for any neighborhood.
Should I test for radon in St. Paul?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; St. Paul's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 1 mean for St. Paul?: St. Paul sits mainly in Ramsey County, which the EPA classifies as Zone 1 - highest potential (predicted average > 4 pCi/L). The zone map dates from 1993 and covers whole counties. The newer model's city average of 2.0 pCi/L does not line up with Zone 1, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

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