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Radon Levels in Hennepin County, Minnesota

EPA puts Hennepin County 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    32.0%

    2.6 pts below MN

    Hennepin
    32.0%
    Minnesota
    34.6%

    6,545 tests, 2023

  • Median result

    2.7pCi/L

    Below action level

    Hennepin
    2.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    6,545

    Most tested in Minnesota

    Hennepin
    6,545

    Reported to CDC before any fix, 2023

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Minnesota

    49 of 62

    Lowest quarter

    Hennepin
    32.0%
    Renville
    75.7%

    By share, of 62 with 30+ tests

Read a result for Hennepin County

Starts at Hennepin County's median, 2.7 pCi/L

2.7pCi/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

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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.

Interpret this readingWhat a fix costs

The data

Hennepin County, At a glance

Hennepin County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Hennepin County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Hennepin County, 2023

Share of reported tests at or above 4 pCi/L, by year, Hennepin County
Share of reported tests at or above 4 pCi/L, by year, Hennepin County
YearShare of reported tests at or above 4 pCi/L
201440.4%
201543.2%
201636.0%
201736.4%
201833.9%
201931.6%
202029.4%
202130.3%
202227.2%
202332.0%

2023: 32.0%. Across these years the share ran from 27.2% to 43.2%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 6,545 tests reported to CDC for Hennepin County over 2023, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).

How to read these figures

Hennepin County, Compared

Hennepin County radon figures, compared

Calculated by Radon411

In Hennepin County, about 3 in 10 reported tests in 2023 (2,096 of 6,545) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 1.4 points lower. Across 86 Minnesota counties pooled together, 34.6% of tests reached that level, so Hennepin County runs 2.6 points below its state.

Of 7 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 19.3% (Anoka County) to 42.4% (Wright County). By share, Hennepin County is 49th of 62 Minnesota counties with 30 or more tests for the same period.

Year by year, 2014 opened at 40.4% and 2023 closed at 32.0% (down 8.4 points), with 2015 the high at 43.2%. Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 47.3 pCi/L. Below the action level, 2,368 tests (36.2%) came in under 2 pCi/L, against 36.6% statewide, and 2,081 tests (31.8%) fell between 2 and 4, against 28.9% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 32.0% share point the same way here. USGS geology rates 100% of the county's land high radon potential.

The busiest year on file was 2014, with 10,703 tests reported; the quietest, 2019, had 4,493.

Share of reported tests at or above 4 pCi/L by year, Hennepin County against Minnesota2014 to 2023, years with 30 or more tests: Hennepin County 40.4% to 32.0%, the state's pooled share 34.6% in 2023.
Hennepin CountyMinnesota, pooled
Share of reported tests at or above 4 pCi/L by year, Hennepin County against Minnesota: data table
YearTestsHennepin County, at or above 4 pCi/LMinnesota, pooled
201410,70340.4%42.9%
20159,75443.2%43.6%
20168,94936.0%37.0%
20179,35736.4%38.2%
20189,39433.9%38.3%
20194,49331.6%36.1%
20206,80429.4%31.8%
20219,15630.3%33.1%
20226,86627.2%31.6%
20236,54532.0%34.6%
Hennepin County against Minnesota, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Hennepin County
Hennepin County6,54532.0%2.7 pCi/LThis county
Minnesota, pooled86 counties, pooled22,44934.6%Not pooled+2.6 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+1.4 points
Renville Countyhighest in the state3775.7%6.3 pCi/L+43.7 points
Lake Countylowest in the state783.8%1.3 pCi/L−28.2 points
Wright County, MNborders it55242.4%3.4 pCi/L+10.4 points
Scott County, MNborders it66941.4%3.4 pCi/L+9.4 points
Carver County, MNborders it48934.6%2.8 pCi/L+2.6 points
Dakota County, MNborders it2,18334.6%2.9 pCi/L+2.6 points
Ramsey County, MNborders it2,21323.5%2.2 pCi/L−8.5 points
Sherburne County, MNborders it35121.7%1.8 pCi/L−10.3 points
Anoka County, MNborders it88019.3%1.9 pCi/L−12.7 points
Where Hennepin County's reported results fell, 2023, beside Minnesota and the United States
ResultHennepin County testsHennepin County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L2,36836.2%36.6%41.4%−0.4 points
2 to 4 pCi/L2,08131.8%28.9%25.2%+2.9 points
4 pCi/L and above2,09632.0%34.6%33.4%−2.6 points
Hennepin County ranked among the 62 Minnesota counties with 30 or more tests, by share at or above 4 pCi/L, 2023
CountyRankTestsAt or above 4 pCi/LMedian
Morrison County44 of 626235.5%3.0 pCi/L
Chisago County45 of 6216634.9%2.9 pCi/L
Dakota County46 of 622,18334.6%2.9 pCi/L
Carver County47 of 6248934.6%2.8 pCi/L
Blue Earth County48 of 6239232.7%2.2 pCi/L
Hennepin County49 of 626,54532.0%2.7 pCi/L
Crow Wing County50 of 6217730.5%2.7 pCi/L
Itasca County51 of 6213726.3%1.9 pCi/L
Cass County52 of 6210625.5%2.3 pCi/L
Todd County53 of 626323.8%2.0 pCi/L
Ramsey County54 of 622,21323.5%2.2 pCi/L
Hennepin County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
20236,54532.0%2.7 pCi/L47.3 pCi/L34.6%+4.8 points
20226,86627.2%2.5 pCi/L48.2 pCi/L31.6%−3.1 points
20219,15630.3%2.6 pCi/L80.6 pCi/L33.1%+0.9 points
20206,80429.4%2.7 pCi/L183.6 pCi/L31.8%−2.2 points
20194,49331.6%2.8 pCi/L35.3 pCi/L36.1%−2.3 points
20189,39433.9%3.0 pCi/L188.8 pCi/L38.3%−2.5 points
20179,35736.4%3.1 pCi/L108.9 pCi/L38.2%+0.4 points
20168,94936.0%3.1 pCi/L77.1 pCi/L37.0%−7.2 points
20159,75443.2%3.5 pCi/L47.5 pCi/L43.6%+2.8 points
201410,70340.4%3.3 pCi/L78.3 pCi/L42.9%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Hennepin County, State data

Minnesota's own radon test data

Measured

What Minnesota's own agencies publish about radon tests in Hennepin County, with their 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 Hennepin County

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

34%

26,848 properties tested with one or more tests at or above 4 pCi/L

Median result

2.8 pCi/L

Average result

3.4 pCi/L

Tests behind these figures

7,894 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.

Hennepin County, Geology

The ground under Hennepin County

Predicted

USGS's geologic map puts all of Hennepin County'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).

USGS's geologic areas under Hennepin County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Central Lowland-Till PrairieSilty and clayey till derived from shale and sandstone.High14100%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Hennepin County beside the ground around it

Hennepin County has more high-potential ground than Minnesota as a whole: 100% of its land against 61.1%. Of the 7 counties that border it, none has as large a share of high-potential ground; Anoka County comes nearest at 100%.

Share of land by USGS radon potential: Hennepin County, the 7 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Hennepin CountyZone 1NoneNone100%
Carver CountyZone 1NoneNone100%
Ramsey CountyZone 1NoneNone100%
Anoka CountyZone 2NoneNone100%
Scott CountyZone 1NoneNone100%
Wright CountyZone 1NoneNone100%
Sherburne CountyZone 1None1.5%98.5%
Dakota CountyZone 1NoneNone100%
Minnesota87 counties, pooled by land areaVariesNone38.9%61.1%

The map rates the ground, not the air in any home.

Local help

Hennepin County, Local resources

Radon testing and mitigation in Hennepin County

Listed radon businesses with an address in Hennepin County:

Listed radon professionals by town: Minneapolis, Bloomington, Brooklyn Park, Plymouth, Maple Grove, Eden Prairie, Edina, Minnetonka, St. Louis Park, Brooklyn Center, Chanhassen, Golden Valley, Hopkins, Rogers, Medina, Rockford, St. Bonifacius, Long Lake

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

Hennepin County, Questions

Questions about radon in Hennepin County

Are radon levels high in Hennepin County?

In 2023, 32.0% of the radon tests reported to CDC for Hennepin County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of 62 Minnesota counties with 30 or more tests for the same period, 48 reported a higher share; pooled, the state comes to 34.6%.

Which counties border Hennepin County?

Hennepin County borders 7 counties: Carver County, Ramsey County, Anoka County, Scott County, Wright County, Sherburne County and Dakota County.

Products

Hennepin County, Products

Testing a home in Hennepin County

In Hennepin County, 32.0% of 6,545 tests reported to CDC in 2023 reached 4 pCi/L, against 34.6% pooled across Minnesota. In Zone 1 the year-round level in Hennepin County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Hennepin County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Hennepin County

Explore

Hennepin County, Bordering counties

Counties bordering Hennepin County

Calculated by Radon411

Hennepin County, Cities and towns

Cities and towns in Hennepin County

Hennepin County's population has barely moved since 2020: 1,284,784 residents on July 1, 2025 against 1,281,663 then, by the Census Bureau's estimates. Packed into its land, that is 2,319 people per square mile. Its largest town, Minneapolis, has 430,324 residents, 33.5% of the total. CDC's 6,545 reported tests for 2023 work out to 5.1 per 1,000 residents (2025 estimate), close to Minnesota's 3.9.

From Minneapolis to Minnetonka Beach, CDC publishes no figure by town: each reads Hennepin County's.

The 12 largest cities and towns in Hennepin County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Minneapolis430,324−0.1%33.5%
Bloomington89,034−0.9%6.9%
Brooklyn Park83,543−3.1%6.5%
Plymouth78,942−2.5%6.1%
Maple Grove73,893+5.1%5.8%
Eden Prairie63,075−1.7%4.9%
Edina54,356+1.9%4.2%
Minnetonka53,969−0.2%4.2%
St. Louis Park50,027Level3.9%
Richfield36,593−0.9%2.8%
Brooklyn Center31,846−5.4%2.5%
Chanhassenextends beyond Hennepin County25,748−0.9%Counted whole
  • Champlin
  • Crystal
  • Golden Valley
  • New Hope
  • Hopkins
  • Rogers
  • Robbinsdale
  • Dayton (part)
  • St. Anthony (part)
  • Minnetrista
  • Corcoran
  • Mound
  • Orono
  • Shorewood (part)
  • Medina
  • Rockford (part)
  • Hanover (part)
  • Wayzata
  • Deephaven
  • Independence
  • Greenfield
  • Osseo
  • Excelsior
  • St. Bonifacius
The other 9 places in Hennepin County
  • Long Lake
  • Maple Plain
  • Spring Park
  • Tonka Bay
  • Medicine Lake
  • Greenwood
  • Loretto
  • Woodland
  • Minnetonka Beach

45 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Hennepin County is counted whole, so it has no share.

Hennepin County, Homes

Homes in Hennepin County

Hennepin County has 564,441 homes, and many share a building: 33% are in buildings of five or more, 52% are detached houses, against 66% across Minnesota. Half of its homes were built before 1973, close to Minnesota's 1978: 36% date from before 1960 and 18% from 2000 or later. 63% of occupied homes are lived in by their owner (Minnesota: 72%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Hennepin County, Minnesota, 2019 to 2023
HomesHennepin CountyMinnesota
Housing units564,4412,519,538
Detached houses52%66%
In buildings of 5 or more33%19%
Mobile homesunder 1%3%
Built before 196036%29%
Built since 200018%22%
Middle year built19731978
Owner-occupied63%72%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.