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Radon Levels in Haakon County, South Dakota

EPA puts Haakon County in Zone 2, its middle radon zone, and only 5 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Highest bordering

    54.5%

    Meade County

    Meade
    54.5%
    Pennington
    51.8%

    2 of 7 neighbours have 30+ tests, 2006 to 2015

  • Nearest county

    54.5%

    Meade County, 61 miles

    Meade
    54.5%
    SD
    58.8%

    Share at 4+ pCi/L, 112 tests, 2006 to 2015

  • Ground above low

    100.0%

    1.0 pts above SD

    Haakon
    100.0%
    SD
    99.0%

    Share of land USGS rates moderate or high potential

  • Tests reported

    5

    Too few for a share

    Haakon
    5
    Needed
    30

    2008 to 2017, laboratory

  • 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

Read a result for Haakon County

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.

Interpret this readingWhat a fix costs

The data

Haakon County, At a glance

Haakon County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Haakon 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: Moderate across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Haakon County, 2008 to 2017, laboratory

CDC holds 5 reported tests for Haakon County over the 2008 to 2017 laboratory totals, with a median of 8.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Haakon County beside the counties around it is how this page reads it.

What these figures count

Only 5 tests were reported to CDC for Haakon County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Haakon County, Compared

Haakon County radon figures, compared

Calculated by Radon411

CDC's largest figure for Haakon County rests on 5 tests over the 2008 to 2017 laboratory totals, 4 of them at or above 4 pCi/L, so each test moves its share by 20.0 points and no rank or comparison is drawn from it. Results reached as high as 9.8 pCi/L, with a middle value of 8.0 pCi/L.

Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Meade County reported the largest share at or above 4 pCi/L, 54.5%, and Pennington County the smallest, 51.8%. Farther out, Hughes County (77 miles away) at 66.7%, Custer County (104 miles away) at 68.3% and Lawrence County (112 miles away) at 60.5% have figures too. Pooled across 63 South Dakota counties, 58.8% of reported tests reached that level; across every county in the country with a figure, 36.3%.

Statewide for the same period, Bon Homme County reported the highest share (79.5%) and Davison County the lowest (47.9%). EPA's 1993 map puts Haakon County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

South Dakota, the United States and the counties around Haakon County, 2006 to 2015, laboratory
AreaTestsAt or above 4 pCi/LMedian
South Dakota, pooled63 counties, pooled4,89358.8%Not pooled
United States, pooled2,669 counties, pooled1,805,52836.3%Not pooled
Bon Homme Countyhighest in the state3979.5%8.1 pCi/L
Davison Countylowest in the state7147.9%3.7 pCi/L
Jones County, SDborders it5100.0%26.4 pCi/L
Stanley County, SDborders it2100.0%5.2 pCi/L
Ziebach County, SDborders it3100.0%11.6 pCi/L
Meade County, SDborders it11254.5%4.1 pCi/L
Pennington County, SDborders it78651.8%4.3 pCi/L
Dewey County, SDborders it10.0%0.6 pCi/L
Jackson County, SDborders it10.0%1.1 pCi/L
The nearest South Dakota counties to Haakon County with 30 or more tests, 2006 to 2015, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Meade County61 mi11254.5%4.1 pCi/L
Pennington County67 mi78651.8%4.3 pCi/L
Hughes County77 mi3066.7%5.5 pCi/L
Custer County104 mi8268.3%7.2 pCi/L
Lawrence County112 mi12460.5%5.3 pCi/L
Brule County129 mi3262.5%6.3 pCi/L
Edmunds County138 mi6861.8%5.0 pCi/L
Beadle County162 mi4663.0%5.6 pCi/L
Haakon County ten-year laboratory totals, against South Dakota's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestSouth Dakota, pooledChange from the row before
2008 to 2017580.0%8.0 pCi/L9.8 pCi/L58.5%+30.0 points
2007 to 2016250.0%6.3 pCi/L9.8 pCi/L57.4%Level
2006 to 2015250.0%6.3 pCi/L9.8 pCi/L58.8%Level
2005 to 2014250.0%6.3 pCi/L9.8 pCi/L59.6%First on file

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

Haakon County, Geology

The ground under Haakon County

Predicted

USGS's geologic map puts all of Haakon County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Pierre Hills, to which USGS gives a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Haakon County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Pierre HillsPierre Shale and Fox Hills sandstone.Moderate10100%

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

Haakon County beside the ground around it

Across South Dakota 56.7% of the land is rated high; none of Haakon County's is. Of the 7 counties that border it, 5 have more high-potential ground, Stanley County the most at 54.0%.

Share of land by USGS radon potential: Haakon County, the 7 counties bordering it and South Dakota
AreaEPA zoneLow potentialModerate potentialHigh potential
Haakon CountyZone 2None100%None
Ziebach CountyZone 2None100%None
Stanley CountyZone 1None46.0%54.0%
Jackson CountyZone 2None100%None
Jones CountyZone 2None99.8%0.2%
Dewey CountyZone 2None54.2%45.8%
Meade CountyZone 2None91.1%8.9%
Pennington CountyZone 2None96.0%4.0%
South Dakota66 counties, pooled by land areaVaries1.0%42.3%56.7%

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

Local help

Haakon County, Local resources

Radon testing and mitigation in Haakon County

What South Dakota's program says
Phone
1-800-438-3367

What it means

Haakon County, Questions

Questions about radon in Haakon County

Are radon levels high in Haakon County?

Over the 2008 to 2017 laboratory totals, 80.0% of the radon tests reported to CDC for Haakon County, South Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 8.0 pCi/L. Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Meade County reported the largest share at or above 4 pCi/L, 54.5%, and Pennington County the smallest, 51.8%.

Which counties border Haakon County?

Haakon County borders 7 counties: Ziebach County, Stanley County, Jackson County, Jones County, Dewey County, Meade County and Pennington County.

Products

Haakon County, Products

Testing a home in Haakon County

No CDC figure names Haakon County; the nearest county with one, Meade County (61 miles away), reported 54.5% of its tests at or above 4 pCi/L over the 2006 to 2015 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Haakon County; a long-term test tells the year-round average.

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Best radon monitors for Haakon County homes, compared

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Haakon County, Bordering counties

Counties bordering Haakon County

Calculated by Radon411

Haakon County, Cities and towns

Cities and towns in Haakon County

About 1,802 people live in Haakon County by the Census Bureau's estimate for July 1, 2025, 67 fewer than in 2020 (−3.6%). Spread over its land, that is 1.0 people to the square mile. Its largest town, Philip, has 740 residents, 41.1% of the total. Together its 2 incorporated places hold 46.9% of those residents; the other 53.1% live outside any of them. Reported testing is thin here: 5 tests over 2008 to 2017, or 2.8 for every 1,000 residents (2025 estimate), where South Dakota as a whole comes to 6.7.

From Philip to Midland, CDC publishes no figure by town: each reads Haakon County's.

The cities and towns in Haakon County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Philip740−2.9%41.1%
Midland105−3.7%5.8%

2 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Haakon County, Homes

Homes in Haakon County

Of Haakon County's 872 homes, 74% are detached houses, against 67% across South Dakota; 20% are mobile homes. The homes are older than South Dakota's as a whole: half were built before 1971 (1979 for South Dakota), and 39% date from before 1960. Owners live in 82% of the occupied homes (South Dakota: 69%), so for most households a test and a fix are their own to order.

Homes in Haakon County, South Dakota, 2019 to 2023
HomesHaakon CountySouth Dakota
Housing units872402,364
Detached houses74%67%
In buildings of 5 or more4%16%
Mobile homes20%8%
Built before 196039%29%
Built since 200016%28%
Middle year built19711979
Owner-occupied82%69%

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