Locations and reports
Radon Levels in South Dakota
What this means for you
- Your area: EPA rates 48 of South Dakota's 66 classified counties Zone 1, the highest of its three radon zones. Zones are predictions for whole counties, and homes with elevated levels occur in all three zones.
- Local tests: CDC publishes South Dakota's radon test results by county. Open your county below to see its figures.
- Your home: The only way to know your home’s level is to test it.
pCi/L (picocuries per liter) is the unit radon is measured in. EPA recommends fixing a home at 4 pCi/L or above, its action level.
For South Dakota, EPA's Map of Radon Zones places 48 of its 66 classified counties in Zone 1, highest predicted potential, a prediction for each county as a whole. Radon levels vary from home to home, so only a test measures the level in yours.
Predicted: EPA radon zone
66 of 66 counties classified
EPA classifies counties, not states. Of the 66 counties in South Dakota with a zone, 48 are in Zone 1 and 18 in Zone 2.
- Zone 1: Highest predicted potentialgreater than 4 pCi/L48 of 66 counties · 72.7%
- Zone 2: Moderate predicted potential2 to 4 pCi/L18 of 66 counties · 27.3%
An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
CDC publishes South Dakota's radon test figures by county: 64 of its 66 counties have one. Each county's share is in the county list.
South Dakota, In figures
South Dakota in figures
What the published data says about South Dakota, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places 48 of South Dakota's 66 counties in Zone 1 and 18 in Zone 2.
Zone 1 counties, A to Z, begin with Aurora County, Beadle County and Bon Homme County; the county section below lists all 48.
Compared
Calculated by Radon41173% of South Dakota's counties with a zone on file are in Zone 1, a larger share than across all U.S. counties (34%). It is a share of counties, not of land, people or homes.
Reported tests
MeasuredCDC has no statewide testing figure for South Dakota on file here.
64 of the 66 counties have a published county figure; the most tests in each one's latest year were reported for Minnehaha County (1,633 in 2017), Lincoln County (671 in 2017) and Pennington County (662 in 2017).
Local record
South Dakota's radon program and its page are under Local resources.
One city has a page setting the figures of the counties it lies in side by side: Aberdeen.
South Dakota, Counties
South Dakota counties by EPA zone
PredictedAll 66 counties, by the zone EPA predicts for each. Every county has its own report.
Zone 1: highest predicted potential48
- Aurora County40.0% of reported tests at or above 4 pCi/L, 2017
- Beadle County59.3% of reported tests at or above 4 pCi/L, 2017
- Bon Homme County74.2% of reported tests at or above 4 pCi/L, 2017
- Brookings County68.5% of reported tests at or above 4 pCi/L, 2017
- Brown County71.0% of reported tests at or above 4 pCi/L, 2017
- Brule County67.6% of reported tests at or above 4 pCi/L, 2017
- Buffalo County100.0% of reported tests at or above 4 pCi/L, 2015
- Campbell County28.6% of reported tests at or above 4 pCi/L, 2017
- Charles Mix County60.7% of reported tests at or above 4 pCi/L, 2017
- Clark County77.8% of reported tests at or above 4 pCi/L, 2017
- Clay County51.8% of reported tests at or above 4 pCi/L, 2017
- Codington County64.9% of reported tests at or above 4 pCi/L, 2017
- Corson County50.0% of reported tests at or above 4 pCi/L, 2015
- Davison County48.8% of reported tests at or above 4 pCi/L, 2017
- Day County54.5% of reported tests at or above 4 pCi/L, 2017
- Deuel County76.0% of reported tests at or above 4 pCi/L, 2017
- Douglas County0.0% of reported tests at or above 4 pCi/L, 2017
- Edmunds County66.7% of reported tests at or above 4 pCi/L, 2017
- Faulk County100.0% of reported tests at or above 4 pCi/L, 2017
- Grant County55.1% of reported tests at or above 4 pCi/L, 2017
- Hamlin County76.9% of reported tests at or above 4 pCi/L, 2017
- Hand County81.8% of reported tests at or above 4 pCi/L, 2017
- Hanson County25.0% of reported tests at or above 4 pCi/L, 2017
- Hughes County70.4% of reported tests at or above 4 pCi/L, 2017
- Hutchinson County66.7% of reported tests at or above 4 pCi/L, 2017
- Hyde County57.1% of reported tests at or above 4 pCi/L, 2017
- Jerauld County69.6% of reported tests at or above 4 pCi/L, 2017
- Kingsbury County68.2% of reported tests at or above 4 pCi/L, 2017
- Lake County76.0% of reported tests at or above 4 pCi/L, 2017
- Lincoln County56.5% of reported tests at or above 4 pCi/L, 2017
- Lyman County100.0% of reported tests at or above 4 pCi/L, 2017
- Marshall County81.3% of reported tests at or above 4 pCi/L, 2017
- McCook County50.0% of reported tests at or above 4 pCi/L, 2017
- McPherson County58.3% of reported tests at or above 4 pCi/L, 2017
- Miner County50.0% of reported tests at or above 4 pCi/L, 2017
- Minnehaha County58.5% of reported tests at or above 4 pCi/L, 2017
- Moody County70.0% of reported tests at or above 4 pCi/L, 2017
- Perkins County76.9% of reported tests at or above 4 pCi/L, 2017
- Potter County0.0% of reported tests at or above 4 pCi/L, 2017
- Roberts County46.2% of reported tests at or above 4 pCi/L, 2017
- Sanborn County71.4% of reported tests at or above 4 pCi/L, 2017
- Spink County50.0% of reported tests at or above 4 pCi/L, 2017
- Stanley County66.7% of reported tests at or above 4 pCi/L, 2017
- Sully County100.0% of reported tests at or above 4 pCi/L, 2017
- Turner County58.6% of reported tests at or above 4 pCi/L, 2017
- Union County51.1% of reported tests at or above 4 pCi/L, 2017
- Walworth County55.6% of reported tests at or above 4 pCi/L, 2017
- Yankton County72.9% of reported tests at or above 4 pCi/L, 2017
Zone 2: moderate predicted potential18
- Bennett County33.3% of reported tests at or above 4 pCi/L, 2017
- Butte County58.3% of reported tests at or above 4 pCi/L, 2017
- Custer County65.7% of reported tests at or above 4 pCi/L, 2017
- Dewey County0.0% of reported tests at or above 4 pCi/L, 2017
- Fall River County62.5% of reported tests at or above 4 pCi/L, 2017
- Gregory County66.7% of reported tests at or above 4 pCi/L, 2017
- Haakon County80.0% of reported tests at or above 4 pCi/L, 2017
- Harding County100.0% of reported tests at or above 4 pCi/L, 2017
- Jackson County0.0% of reported tests at or above 4 pCi/L, 2017
- Jones County75.0% of reported tests at or above 4 pCi/L, 2017
- Lawrence County56.9% of reported tests at or above 4 pCi/L, 2017
- Meade County51.8% of reported tests at or above 4 pCi/L, 2017
- Mellette CountyReported testing not yet available
- Oglala Lakota CountyReported testing not yet available
- Pennington County53.6% of reported tests at or above 4 pCi/L, 2017
- Todd County100.0% of reported tests at or above 4 pCi/L, 2017
- Tripp County55.6% of reported tests at or above 4 pCi/L, 2017
- Ziebach County100.0% of reported tests at or above 4 pCi/L, 2017
South Dakota, Cities
Cities in South 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.
South Dakota, Local resources
Local resources in South Dakota
Who to ask in South Dakota: the state's radon program, test kits and professionals.
South Dakota's radon program
Department of Agriculture and Natural Resources
South Dakota’s radon program answers questions about testing, mitigation and the rules where you live.
- Phone
- 1-800-438-3367
Test kits
The program says: The Department of Agriculture and Natural Resources (DANR) will provide 500 free Radon test kits to South Dakota Residents.
Radon professionals
2 professionals are listed in South Dakota.
Professionals in South DakotaSouth Dakota, Questions
Questions about radon in South Dakota
Common questions9 questions, answered from the figures above
Is radon a problem in South Dakota?
EPA's Map of Radon Zones places 48 of the 66 South Dakota counties it classifies in Zone 1, the highest predicted potential, 18 in Zone 2 and 0 in Zone 3. An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.
How do I get a radon test in South Dakota?
EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. The South Dakota radon program is the place to ask about certified testers and any test kit offer it runs.
How to test a homeFree and low-cost kits by stateSouth Dakota radon program
Who does radon mitigation in South Dakota?
Radon411's South Dakota directory lists 2 certified radon companies. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional.
How radon mitigation worksWhat mitigation costsRadon professionals in South Dakota
Which South Dakota counties are in EPA radon Zone 1?
48 counties are in Zone 1: Aurora County, Beadle County, Bon Homme County, Brookings County, Brown County, Brule County, Buffalo County, Campbell County, and 40 more in the county table on this page. Zone 1 is EPA's class for highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. A zone is a prediction for a county, not a measurement of any home.
Radon in Aurora CountyRadon in Beadle CountyRadon in Bon Homme County
Which South Dakota counties have the highest radon?
66 of South Dakota's 66 counties have an EPA radon zone published here. Radon411 will not rank counties on data it does not hold, and a zone is a prediction for an area rather than a measurement of any building.
What share of radon tests in South Dakota are high?
CDC has published no statewide radon testing statistics for South Dakota, so we cannot give a figure. Where CDC does publish one, the percentage describes radon tests reported to CDC, not homes.
Which EPA region is South Dakota in?
South Dakota is in EPA Region 8: Mountains and Plains.
Do I need to test my home in South Dakota?
Yes, wherever you live in the state. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L.
Why does this page show coverage rather than one radon level for South Dakota?
A statewide figure averages counties with very different geology and very different numbers of reported tests, so it hides more than it shows. The county report is the level at which the EPA zone, the geologic potential and the reported testing statistics are actually published, which is why the county table above links to every one of them.
What these figures mean if you own, buy, sell or rent
The zone counts on this page describe counties across South Dakota. They are predictions for areas, and none of them measures your building.
- How to test a home
If you own your home
Test the lowest lived-in level; a short-term kit screens in days, a long-term kit reflects the year.
- Buying a house: radon guide
If you are buying
Ask for past results and any system's post-mitigation test, and test during the sale.
- Selling a house: radon guide
If you are selling
Testing before you list puts the timing in your hands; disclosure rules differ by state.
- Radon in rental homes
If you rent, or rent out a home
A tenant can test; a fix is the owner's to make, and duties differ by state.
How long a test has to run, under what conditions, and what EPA says a result means: the testing standard, in full.
South Dakota, Products
Testing and mitigation products
Whatever the figures for South Dakota show, only a test tells you about one home.
Testing
- Short-term test kitsPassive detectors exposed for a few days under closed-building conditions, then analyzed by a lab.
- Long-term test kitsDetectors exposed for more than 90 days, for a closer picture of the annual average.
- Continuous monitorsPowered devices that log radon on a repeating cycle, often used for transaction tests.
- Digital detectorsConsumer devices that display a running radon reading without a lab.
- Water radon testsKits for radon dissolved in well water, analyzed by a lab.
Mitigation
- Mitigation fansThe inline fan that keeps a soil depressurization system running, sized by the installer.
- System indicatorsU-tube manometers and fan alarms that show whether a mitigation system is still working.
- Sealing materialsCrack, joint and sump sealing used alongside a mitigation system, not instead of one.
South Dakota / Next steps
What to do next
Learn
Know what radon is
What radon is, how it gets indoors, and why a county zone is not a reading for your home.
Learn about radonTest
Test the building you live in
Short-term or long-term, where the device goes, and closed-house conditions.
How to testFix
Bring a high level down
How a mitigation system works, and the retest that confirms it.
How mitigation worksFind a pro
Hire a certified professional
Measurement and mitigation professionals by state, with their certifications.
Find a professional
Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.