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Radon Levels in Anoka County, Minnesota

EPA puts Anoka County in Zone 2, its middle radon zone, and 19.3% of its 880 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

    19.3%

    15.3 pts below MN

    Anoka
    19.3%
    Minnesota
    34.6%

    880 tests, 2023

  • Median result

    1.9pCi/L

    Below action level

    Anoka
    1.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    880

    5th of 62 by tests

    Anoka
    880
    Hennepin
    6,545

    Reported to CDC before any fix, 2023

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Minnesota

    60 of 62

    Lowest quarter

    Anoka
    19.3%
    Renville
    75.7%

    By share, of 62 with 30+ tests

Read a result for Anoka County

Starts at Anoka County's median, 1.9 pCi/L

1.9pCi/L

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

EPA’s reading of 1.9 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Anoka County's median reported result, 2023.

Interpret this reading

The data

Anoka County, At a glance

Anoka County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Anoka County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

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 Anoka County, 2023

Share of reported tests at or above 4 pCi/L, by year, Anoka County
Share of reported tests at or above 4 pCi/L, by year, Anoka County
YearShare of reported tests at or above 4 pCi/L
201419.3%
201519.8%
201615.8%
201717.9%
201819.6%
201915.3%
202013.8%
202115.6%
202215.1%
202319.3%

2023: 19.3%. Across these years the share ran from 13.8% to 19.8%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 880 tests reported to CDC for Anoka 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

Anoka County, Compared

Anoka County radon figures, compared

Calculated by Radon411

Anoka County's 880 reported tests in 2023 had a middle value of 1.9 pCi/L and a maximum of 190.1 pCi/L, and 19.3% reached 4 pCi/L. Minnesota as a whole (86 Minnesota counties, pooled) comes to 34.6%: 15.3 points higher than here.

Among its state's counties it ranks 60th of 62 Minnesota counties with 30 or more tests for the same period. Statewide for the same period, Renville County reported the highest share (75.7%) and Lake County the lowest (3.8%).

Below the action level, 466 tests (53.0%) came in under 2 pCi/L, against 36.6% statewide, and 244 tests (27.7%) fell between 2 and 4, against 28.9% statewide. The busiest year on file was 2015, with 1,730 tests reported; the quietest, 2019, had 675.

EPA's 1993 zone map puts Anoka County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.

Next door, the shares run from 21.3% in Washington County to 34.9% in Chisago County. Over 10 years of annual figures the share held within 2 points, from 19.3% in 2014 to 19.3% in 2023; its peak was 19.8% in 2015.

Share of reported tests at or above 4 pCi/L by year, Anoka County against Minnesota2014 to 2023, years with 30 or more tests: Anoka County 19.3% to 19.3%, the state's pooled share 34.6% in 2023.
Anoka CountyMinnesota, pooled
Share of reported tests at or above 4 pCi/L by year, Anoka County against Minnesota: data table
YearTestsAnoka County, at or above 4 pCi/LMinnesota, pooled
20141,64119.3%42.9%
20151,73019.8%43.6%
20161,63115.8%37.0%
20171,39117.9%38.2%
20181,48119.6%38.3%
201967515.3%36.1%
202095613.8%31.8%
20211,02015.6%33.1%
202288315.1%31.6%
202388019.3%34.6%
Anoka County against Minnesota, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Anoka County
Anoka County88019.3%1.9 pCi/LThis county
Minnesota, pooled86 counties, pooled22,44934.6%Not pooled+15.3 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+14.1 points
Renville Countyhighest in the state3775.7%6.3 pCi/L+56.4 points
Lake Countylowest in the state783.8%1.3 pCi/L−15.5 points
Chisago County, MNborders it16634.9%2.9 pCi/L+15.6 points
Hennepin County, MNborders it6,54532.0%2.7 pCi/L+12.7 points
Ramsey County, MNborders it2,21323.5%2.2 pCi/L+4.2 points
Isanti County, MNborders it6622.7%2.0 pCi/L+3.4 points
Sherburne County, MNborders it35121.7%1.8 pCi/L+2.4 points
Washington County, MNborders it1,51821.3%1.9 pCi/L+2.0 points
Where Anoka County's reported results fell, 2023, beside Minnesota and the United States
ResultAnoka County testsAnoka County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L46653.0%36.6%41.4%+16.4 points
2 to 4 pCi/L24427.7%28.9%25.2%−1.2 points
4 pCi/L and above17019.3%34.6%33.4%−15.3 points
Anoka 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
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
Benton County55 of 624323.3%2.2 pCi/L
Isanti County56 of 626622.7%2.0 pCi/L
Sherburne County57 of 6235121.7%1.8 pCi/L
Washington County58 of 621,51821.3%1.9 pCi/L
St. Louis County59 of 6249620.2%1.7 pCi/L
Anoka County60 of 6288019.3%1.9 pCi/L
Cook County61 of 623212.5%1.8 pCi/L
Lake County62 of 62783.8%1.3 pCi/L
Anoka County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
202388019.3%1.9 pCi/L190.1 pCi/L34.6%+4.2 points
202288315.1%1.7 pCi/L22.7 pCi/L31.6%−0.5 points
20211,02015.6%1.9 pCi/L47.3 pCi/L33.1%+1.8 points
202095613.8%1.7 pCi/L10.3 pCi/L31.8%−1.5 points
201967515.3%2.0 pCi/L27.4 pCi/L36.1%−4.3 points
20181,48119.6%1.9 pCi/L27.0 pCi/L38.3%+1.7 points
20171,39117.9%1.9 pCi/L16.0 pCi/L38.2%+2.1 points
20161,63115.8%1.8 pCi/L21.1 pCi/L37.0%−4.0 points
20151,73019.8%2.1 pCi/L26.8 pCi/L43.6%+0.5 points
20141,64119.3%1.9 pCi/L57.0 pCi/L42.9%First on file

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

Anoka County, State data

Minnesota's own radon test data

Measured

What Minnesota's own agencies publish about radon tests in Anoka 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 Anoka 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

15.3%

2,163 properties tested with one or more tests at or above 4 pCi/L

Median result

1.8 pCi/L

Average result

2.3 pCi/L

Tests behind these figures

1,409 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.

Anoka County, Geology

The ground under Anoka County

Predicted

USGS's geologic map puts all of Anoka 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 Anoka 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.

Anoka County beside the ground around it

Anoka County has more high-potential ground than Minnesota as a whole: 100% of its land against 61.1%. Of the 6 counties that border it, none has as large a share of high-potential ground; Hennepin County comes nearest at 100%.

Share of land by USGS radon potential: Anoka County, the 6 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Anoka CountyZone 2NoneNone100%
Ramsey CountyZone 1NoneNone100%
Hennepin CountyZone 1NoneNone100%
Washington CountyZone 1NoneNone100%
Chisago CountyZone 2NoneNone100%
Sherburne CountyZone 1None1.5%98.5%
Isanti CountyZone 2None2.3%97.7%
Minnesota87 counties, pooled by land areaVariesNone38.9%61.1%

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

Local help

Anoka County, Local resources

Radon testing and mitigation in Anoka County

Listed radon businesses with an address in Anoka County:

Listed radon professionals by town: Blaine, Coon Rapids, Andover, Fridley, Columbia Heights, Ham Lake, East Bethel

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

Anoka County, Questions

Questions about radon in Anoka County

Are radon levels high in Anoka County?

In 2023, 19.3% of the radon tests reported to CDC for Anoka County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.9 pCi/L. Of 62 Minnesota counties with 30 or more tests for the same period, 59 reported a higher share; pooled, the state comes to 34.6%.

Which counties border Anoka County?

Anoka County borders 6 counties: Ramsey County, Hennepin County, Washington County, Chisago County, Sherburne County and Isanti County.

Products

Anoka County, Products

Testing a home in Anoka County

In Anoka County, 19.3% of 880 tests reported to CDC in 2023 reached 4 pCi/L, against 34.6% pooled across Minnesota. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Anoka County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Anoka County homes, compared

Explore

Anoka County, Bordering counties

Counties bordering Anoka County

Calculated by Radon411

Anoka County, Cities and towns

Cities and towns in Anoka County

The Census Bureau estimates 381,605 residents in Anoka County for July 1, 2025, 17,131 more than in 2020 (+4.7%). That works out to 904 people per square mile of land. Blaine, the largest place on its list (76,603 residents in all), extends beyond Anoka County, so no share of the total is worked out for it. Reported testing is thin here: 880 tests over 2023, or 2.3 for every 1,000 residents (2025 estimate), where Minnesota as a whole comes to 3.9.

From Blaine to Bethel, CDC publishes no figure by town: each reads Anoka County's.

The 12 largest cities and towns in Anoka County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Blaineextends beyond Anoka County76,603+8.7%Counted whole
Coon Rapids64,193+0.9%16.8%
Andover33,874+3.7%8.9%
Fridley30,829+4.2%8.1%
Ramsey29,624+6.5%7.8%
Lino Lakes23,220+8.2%6.1%
Columbia Heights22,482+2.5%5.9%
Anoka18,169+1.5%4.8%
Ham Lake17,104+3.6%4.5%
East Bethel12,605+6.9%3.3%
Oak Grove9,476+5.9%2.5%
St. Francisextends beyond Anoka County8,635+5.7%Counted whole
  • Spring Lake Park (part)
  • Circle Pines
  • Nowthen
  • Columbus
  • Centerville
  • Lexington
  • Hilltop
  • Bethel

20 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 Anoka County is counted whole, so it has no share.

Anoka County, Homes

Homes in Anoka County

Of Anoka County's 140,246 homes, 69% are detached houses, against 66% across Minnesota; 13% are in buildings of five or more homes. Half of its homes were built before 1985, close to Minnesota's 1978: 14% date from before 1960 and 25% from 2000 or later. Owners live in 80% of the occupied homes (Minnesota: 72%), so for most households a test and a fix are their own to order.

Homes in Anoka County, Minnesota, 2019 to 2023
HomesAnoka CountyMinnesota
Housing units140,2462,519,538
Detached houses69%66%
In buildings of 5 or more13%19%
Mobile homes3%3%
Built before 196014%29%
Built since 200025%22%
Middle year built19851978
Owner-occupied80%72%

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