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Minnesota Radon Map and Levels by County

Minnesota's counties span EPA Zones 1 and 2. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    43.4%

    7.7 pts above U.S.

    Minnesota
    43.4%
    U.S.
    35.7%

    130,912 tests across 87 counties, 2008 to 2017

  • Rank among states

    11 of 47

    Middle of the states

    Minnesota
    43.4%
    North Dakota
    59.3%

    By share, every state pooled the same way, 2008 to 2017

  • Counties in EPA Zone 1

    68 of 87

    Most at highest potential

    Zone 1
    68
    Zone 2
    19

    Most counties sit in Zone 1; Zone 1 is the highest potential

  • Highest county

    83.8%

    Rock County

    Rock
    83.8%
    Anoka
    17.4%

    Counties with 30+ tests, 2008 to 2017

Read a result for Minnesota

Starts at EPA's action level

4.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.0 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. 43.4% of Minnesota's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Minnesota, At a glance

Minnesota at a glance

Predicted: EPA radon zone

87 of 87 counties classified

EPA classifies counties, not states. Of the 87 counties in Minnesota with a zone, 68 are in Zone 1 and 19 in Zone 2.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L68 of 87 counties · 78.2%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L19 of 87 counties · 21.8%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes Minnesota's radon test figures by county: 87 of its 87 counties have one. Each one's share is in the county list.

How to read these figures

Minnesota, Compared

Minnesota radon figures, compared

Calculated by Radon411
Minnesota, 2008 to 2017, laboratory
43.4%
of 130,912 tests at or above 4 pCi/L, pooled
Against the U.S.
+7.7points
35.7% pooled
Rank among the states
11 of 47
1 is the highest share
Counties with 30 or more tests
85
Highest
83.8%
Rock County
Lowest
17.4%
Anoka County

Minnesota pools to 43.4%: that share of 130,912 reported tests from 87 counties over the 2008 to 2017 laboratory totals reached EPA's action level. Nationally the pooled share is 35.7%: 7.7 points lower than here.

Among 47 states pooled the same way it ranks 11th, with Kentucky (43.7%) above it and Illinois (43.1%) below. Rock County reports the highest share (83.8% of 210 tests) and Anoka County the lowest (17.4%); the most tests came from Hennepin County, 35,213 of them at 40.3%.

Across its 4 overlapping ten-year totals, the share went from 44.2% (2005 to 2014) to 43.4% (2008 to 2017), within 2 points, with 2006 to 2015 the highest at 45.0%. By band, 52 counties at 50% or more, 24 counties at 30% to 50%, 9 counties at 15% to 30%.

EPA's 1993 map puts 68 of its 87 classified counties in Zone 1; the tests reported since bear that out at 43.4%.

Minnesota ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2008 to 2017, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Colorado6 of 476396,36747.0%
Wisconsin7 of 477268,10446.9%
Montana8 of 47519,89345.5%
Wyoming9 of 47237,63844.3%
Kentucky10 of 4712028,79343.7%
Minnesota11 of 4787130,91243.4%
Illinois12 of 47102108,90943.1%
Utah13 of 472828,34241.9%
Pennsylvania14 of 4767203,04541.7%
Idaho15 of 474412,96141.5%
Indiana16 of 479243,14838.9%
Minnesota's highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/L
Rock County1 of 8521083.8%
Murray County2 of 8523776.4%
Renville County3 of 8530375.2%
Brown County4 of 851,47673.7%
Yellow Medicine County5 of 8522971.6%
Pipestone County6 of 8536071.4%
Polk County7 of 8539770.8%
Nobles County8 of 8526770.4%
Redwood County9 of 8544170.1%
Jackson County10 of 8539469.8%
Anoka County85 of 855,95817.4%
Isanti County84 of 8544718.6%
Lake County83 of 8520221.8%
St. Louis County82 of 854,60823.7%
Pine County81 of 8523124.2%
Minnesota's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2008 to 2017, laboratory
ShareCountiesTheir testsFor example
50% or more5239,937Rock County, Murray County, Renville County
30% to 50%2477,862Pope County, Todd County, Mower County
15% to 30%913,083Roseau County, Crow Wing County, Mille Lacs County
5% to 15%00None
Under 5%00None
Minnesota ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 201787130,91243.4%35.7%−0.7 points
2007 to 201687120,76444.1%35.8%−0.9 points
2006 to 201587114,18945.0%36.3%+0.8 points
2005 to 201487116,16644.2%36.0%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

Minnesota, State data

Minnesota's own radon test data

Measured

What Minnesota's own agencies publish about radon tests, with their publisher and period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What the Minnesota Department of Health reports for Minnesota

Radon Testing (MN Public Health Data Access Portal): home radon tests reported voluntarily by private laboratories and licensed radon measurement professionals, counted by property. Period: 2016-2025.

Share with one or more tests at or above 4 pCi/L

36.2%

94,719 properties tested with one or more tests at or above 4 pCi/L

Median result

2.8 pCi/L

Average result

3.8 pCi/L

Tests behind these figures

26,137 properties tested a year on average

  • MDH says these data do not include all of the radon tests conducted in Minnesota.
  • Post-mitigation tests are excluded from the averages and the median; the percentages use each property's highest test.
  • Each home is unique and can have very different results than a neighbor's home; the only way to know is to test.
  • These figures describe tests reported to the Minnesota Department of Health in this area. They count a different set of tests than CDC's figures and are not a reading of any one home.

Measured: Minnesota Department of Health data, 2016-2025.

Minnesota, Counties

Minnesota counties by EPA zone

Predicted

Minnesota's radon map, then all 87 counties by EPA's zone, the highest reported share of tests at or above 4 pCi/L first; each has its own report.

Minnesota radon map by county: EPA radon zones. Map of Minnesota's 87 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber. 68 in Zone 1, 19 in Zone 2, 0 in Zone 3.
Minnesota radon map by countyEPA radon zones for Minnesota's counties: 68 counties in Zone 1, 19 counties in Zone 2, 0 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in Minnesota, 2008 to 2017

Zone 1: highest predicted potential68

Local help

Minnesota, Local resources

Local resources in Minnesota

Who to ask in Minnesota: its radon program, test kits and professionals.

What Minnesota's program says
Phone
651-201-4601
Email
health.indoorair@state.mn.us
Licensing of radon professionals
The Radon Licensing Act requires anyone who performs a radon test or radon mitigation, in a building they do not own or lease, must be licensed by MDH.
Disclosure when a home is sold or rented
The Minnesota Radon Awareness Act requires specific disclosure and education be provided to potential home buyers during residential real estate transactions in Minnesota.

What it means

Minnesota, Questions

Questions about radon in Minnesota

Is radon a problem in Minnesota?

EPA's Map of Radon Zones places 68 of the 87 Minnesota counties it classifies in Zone 1, the highest predicted potential, 19 in Zone 2 and 0 in Zone 3. Pooled from 87 counties, 43.4% of the 130,912 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 11th of 47 states.

Who does radon mitigation in Minnesota?

255 radon businesses are listed for Minnesota, for testing, mitigation or both; each listing names the licensing list it was read from.

Which Minnesota counties are in EPA radon Zone 1?

Zone 1 holds 68 counties in Minnesota; the first 8 by name are Becker County, Big Stone County, Blue Earth County, Brown County, Carver County, Chippewa County, Clay County, Cottonwood County, the rest in the county table on this page.

Which Minnesota counties have the highest radon?

Rock County 83.8% (210 tests) leads Minnesota by the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory, then Murray County 76.4% (237 tests), Renville County 75.2% (303 tests), Brown County 73.7% (1,476 tests), Yellow Medicine County 71.6% (229 tests).

Which EPA region is Minnesota in?

Minnesota is in EPA Region 5: Great Lakes.

Products

Minnesota, Products

Testing a home in Minnesota

43.4% of the 130,912 tests reported to CDC for Minnesota over the 2008 to 2017 laboratory totals reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in Minnesota; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Minnesota homes, compared

Explore

Cities in Minnesota with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.