Skip to content
RADON411

Locations and reports

North Dakota Radon Map and Levels by County

EPA puts all of North Dakota's classified counties in Zone 1. 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

    56.3%

    20.0 pts above U.S.

    North Dakota
    56.3%
    U.S.
    36.3%

    6,733 tests across 53 counties, 2006 to 2015

  • Rank among states

    4 of 47

    Ten highest states

    North Dakota
    56.3%
    Nebraska
    59.7%

    By share, every state pooled the same way, 2006 to 2015

  • Counties in EPA Zone 1

    53 of 53

    Most at highest potential

    Zone 1
    53
    Zone 2
    0

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

  • Highest county

    80.0%

    Dunn County

    Dunn
    80.0%
    Richland
    35.1%

    Counties with 30+ tests, 2006 to 2015

Read a result for North Dakota

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. 56.3% of North Dakota's reported tests reached 4 pCi/L, 2006 to 2015.

Interpret this readingWhat a fix costs

The data

North Dakota, At a glance

North Dakota at a glance

Predicted: EPA radon zone

53 of 53 counties classified

EPA classifies counties, not states. Of the 53 counties in North Dakota with a zone, 53 are in Zone 1.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L53 of 53 counties · 100.0%

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 North Dakota's radon test figures by county: 53 of its 53 counties have one. Each one's share is in the county list.

How to read these figures

North Dakota, Compared

North Dakota radon figures, compared

Calculated by Radon411
North Dakota, 2006 to 2015, laboratory
56.3%
of 6,733 tests at or above 4 pCi/L, pooled
Against the U.S.
+20.0points
36.3% pooled
Rank among the states
4 of 47
1 is the highest share
Counties with 30 or more tests
36
Highest
80.0%
Dunn County
Lowest
35.1%
Richland County

Pooled across 53 counties, 56.3% of the 6,733 radon tests reported to CDC for North Dakota over the 2006 to 2015 laboratory totals were at or above 4 pCi/L: close to half or more. That is 4th of 47 states with county figures for the period; South Dakota (58.8%) above it and Ohio (52.9%) below.

Its 36 counties with 30 or more tests run from 35.1% in Richland County to 80.0% in Dunn County; in 28 of them half or more of the reported tests reached 4 pCi/L. By band, 28 counties at 50% or more, 8 counties at 30% to 50%.

The national pool for the same period is 36.3%, so North Dakota runs 20.0 points above the country. EPA's 1993 map puts 53 of its 53 classified counties in Zone 1; the tests reported since bear that out at 56.3%.

Across its 4 overlapping ten-year totals, the share went from 54.0% (2005 to 2014) to 59.3% (2008 to 2017), up 5.3 points, with 2008 to 2017 the highest at 59.3%.

North Dakota ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2006 to 2015, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Nebraska1 of 479338,15859.7%
Iowa2 of 479986,18759.4%
South Dakota3 of 47634,89358.8%
North Dakota4 of 47536,73356.3%
Ohio5 of 478890,76952.9%
Colorado6 of 476379,42848.8%
Wisconsin7 of 477261,34948.2%
Montana8 of 47528,56047.4%
Kentucky9 of 4712023,26246.4%
Wyoming10 of 47237,32345.3%
Minnesota11 of 4787114,18945.0%
North Dakota's highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2006 to 2015, laboratory
CountyRankTestsAt or above 4 pCi/L
Dunn County1 of 364580.0%
Benson County2 of 363479.4%
Walsh County3 of 3615778.3%
Pembina County4 of 366478.1%
Kidder County5 of 363677.8%
Ramsey County6 of 3614475.0%
Grand Forks County7 of 3655174.8%
Stutsman County8 of 3624771.3%
LaMoure County9 of 363770.3%
Bowman County10 of 364669.6%
Richland County36 of 3613435.1%
Williams County35 of 3628035.4%
Ward County34 of 3662337.7%
Wells County33 of 3611139.6%
Traill County32 of 364440.9%
North Dakota's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2006 to 2015, laboratory
ShareCountiesTheir testsFor example
50% or more283,782Dunn County, Benson County, Walsh County
30% to 50%82,642Burleigh County, Rolette County, Pierce County
15% to 30%00None
5% to 15%00None
Under 5%00None
North Dakota ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 2017536,60759.3%35.7%+0.6 points
2007 to 2016536,71958.7%35.8%+2.4 points
2006 to 2015536,73356.3%36.3%+2.3 points
2005 to 2014536,53154.0%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.

North Dakota, Counties

North Dakota counties by EPA zone

Predicted

North Dakota's radon map, then all 53 counties by EPA's zone, the highest reported share of tests at or above 4 pCi/L first; each has its own report.

North Dakota radon map by county: EPA radon zones. Map of North Dakota's 53 counties shaded by EPA radon zone: Zone 1 in red-orange. 53 in Zone 1, 0 in Zone 2, 0 in Zone 3.
North Dakota radon map by countyEPA radon zones for North Dakota's counties: 53 counties in Zone 1, 0 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 North Dakota, 2006 to 2015

Zone 1: highest predicted potential53

Local help

North Dakota, Local resources

Local resources in North Dakota

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

What North Dakota's program says
Phone
701-328-5166
Email
jOtto@nd.gov

What it means

North Dakota, Questions

Questions about radon in North Dakota

Is radon a problem in North Dakota?

EPA's Map of Radon Zones places 53 of the 53 North Dakota counties it classifies in Zone 1, the highest predicted potential, 0 in Zone 2 and 0 in Zone 3. Pooled from 53 counties, 56.3% of the 6,733 radon tests reported to CDC over the 2006 to 2015 laboratory totals were at or above 4 pCi/L, 4th of 47 states.

Which North Dakota counties are in EPA radon Zone 1?

53 counties are in Zone 1: Adams County, Barnes County, Benson County, Billings County, Bottineau County, Bowman County, Burke County, Burleigh County, and 45 more in the county table on this page.

Who does radon mitigation in North Dakota?

Radon411's North Dakota directory lists 47 radon businesses for testing, mitigation or both, each with the licensing list it was read from.

Which North Dakota counties have the highest radon?

By the share of reported tests at or above 4 pCi/L, 2006 to 2015, laboratory: Dunn County 80.0% (45 tests), Benson County 79.4% (34 tests), Walsh County 78.3% (157 tests), Pembina County 78.1% (64 tests), Kidder County 77.8% (36 tests).

Which EPA region is North Dakota in?

North Dakota is in EPA Region 8: Mountains and Plains.

Products

North Dakota, Products

Testing a home in North Dakota

56.3% of the 6,733 tests reported to CDC for North Dakota over the 2006 to 2015 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 North Dakota; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for North Dakota homes, compared

Explore

Cities in North Dakota 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.