Skip to content
RADON411

Locations and reports

Radon Levels in Ziebach County, South Dakota

EPA puts Ziebach County in Zone 2, its middle radon zone, and only 3 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

How to test this homeFind a certified tester

  • Highest bordering

    54.5%

    Meade County

    Meade
    54.5%

    1 of 6 neighbours have 30+ tests, 2006 to 2015

  • Nearest county

    54.5%

    Meade County, 59 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

    Ziebach
    100.0%
    SD
    99.0%

    Share of land USGS rates moderate or high potential

  • Tests reported

    3

    Too few for a share

    Ziebach
    3
    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 Ziebach 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

Ziebach County, At a glance

Ziebach County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Ziebach 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 Ziebach County, 2008 to 2017, laboratory

CDC holds 3 reported tests for Ziebach County over the 2008 to 2017 laboratory totals, with a median of 11.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Ziebach County beside the counties around it is how this page reads it.

What these figures count

Only 3 tests were reported to CDC for Ziebach 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

Ziebach County, Compared

Ziebach County radon figures, compared

Calculated by Radon411

CDC's largest figure for Ziebach County rests on 3 tests over the 2008 to 2017 laboratory totals, 3 of them at or above 4 pCi/L, so each test moves its share by 33.3 points and no rank or comparison is drawn from it. Results reached as high as 13.2 pCi/L, with a middle value of 11.6 pCi/L.

Meade County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 54.5% of its tests at or above 4 pCi/L. Farther out, Pennington County (88 miles away) at 51.8%, Hughes County (92 miles away) at 66.7% and Lawrence County (113 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 Ziebach 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 Ziebach 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
Stanley County, SDborders it2100.0%5.2 pCi/L
Perkins County, SDborders it1662.5%7.9 pCi/L
Meade County, SDborders it11254.5%4.1 pCi/L
Corson County, SDborders it250.0%8.0 pCi/L
Haakon County, SDborders it250.0%6.3 pCi/L
Dewey County, SDborders it10.0%0.6 pCi/L
The nearest South Dakota counties to Ziebach County with 30 or more tests, 2006 to 2015, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Meade County59 mi11254.5%4.1 pCi/L
Pennington County88 mi78651.8%4.3 pCi/L
Hughes County92 mi3066.7%5.5 pCi/L
Lawrence County113 mi12460.5%5.3 pCi/L
Edmunds County123 mi6861.8%5.0 pCi/L
Custer County126 mi8268.3%7.2 pCi/L
Brule County155 mi3262.5%6.3 pCi/L
Brown County167 mi5259.6%4.4 pCi/L
Ziebach 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 20173100.0%11.6 pCi/L13.2 pCi/L58.5%Level
2007 to 20163100.0%11.6 pCi/L13.2 pCi/L57.4%Level
2006 to 20153100.0%11.6 pCi/L13.2 pCi/L58.8%Level
2005 to 20143100.0%11.6 pCi/L13.2 pCi/L59.6%First on file

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

Ziebach County, Geology

The ground under Ziebach County

Predicted

USGS's geologic map puts all of Ziebach 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 Ziebach 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.

Ziebach County beside the ground around it

Across South Dakota 56.7% of the land is rated high; none of Ziebach County's is. Of the 6 counties that border it, 5 have more high-potential ground, Corson County the most at 56.2%.

Share of land by USGS radon potential: Ziebach County, the 6 counties bordering it and South Dakota
AreaEPA zoneLow potentialModerate potentialHigh potential
Ziebach CountyZone 2None100%None
Haakon CountyZone 2None100%None
Dewey CountyZone 2None54.2%45.8%
Stanley CountyZone 1None46.0%54.0%
Meade CountyZone 2None91.1%8.9%
Corson CountyZone 1None43.8%56.2%
Perkins CountyZone 1None46.2%53.8%
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

Ziebach County, Local resources

Radon testing and mitigation in Ziebach County

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

What it means

Ziebach County, Questions

Questions about radon in Ziebach County

Are radon levels high in Ziebach County?

Over the 2008 to 2017 laboratory totals, 100.0% of the radon tests reported to CDC for Ziebach County, South Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 11.6 pCi/L. Meade County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 54.5% of its tests at or above 4 pCi/L.

Which counties border Ziebach County?

Ziebach County borders 6 counties: Haakon County, Dewey County, Stanley County, Meade County, Corson County and Perkins County.

Products

Ziebach County, Products

Testing a home in Ziebach County

No CDC figure names Ziebach County; the nearest county with one, Meade County (59 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 Ziebach County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Ziebach County homes, compared

Explore

Ziebach County, Bordering counties

Counties bordering Ziebach County

Calculated by Radon411

Ziebach County, Cities and towns

Cities and towns in Ziebach County

Ziebach County's population has barely moved since 2020: 2,389 residents on July 1, 2025 against 2,391 then, by the Census Bureau's estimates. Spread over its land, that is 1.2 people to the square mile. Eagle Butte, the largest place on its list (1,269 residents in all), extends beyond Ziebach County, so no share of the total is worked out for it. Reported testing is thin here: 3 tests over 2008 to 2017, or 1.3 for every 1,000 residents (2025 estimate), where South Dakota as a whole comes to 6.7.

From Eagle Butte to Dupree, CDC publishes no figure by town: each reads Ziebach County's.

The cities and towns in Ziebach County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Eagle Butteextends beyond Ziebach County1,269+1.8%Counted whole
Dupree492+0.2%20.6%

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). A place that extends beyond Ziebach County is counted whole, so it has no share.

Ziebach County, Homes

Homes in Ziebach County

Of Ziebach County's 895 homes, 61% are detached houses, against 67% across South Dakota; 23% are mobile homes. Much of Ziebach County is recent building: 17% of its homes have gone up since 2000 and the middle year built is 1987, against 1979 for South Dakota. 54% of occupied homes are lived in by their owner (South Dakota: 69%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Ziebach County, South Dakota, 2019 to 2023
HomesZiebach CountySouth Dakota
Housing units895402,364
Detached houses61%67%
In buildings of 5 or more9%16%
Mobile homes23%8%
Built before 196015%29%
Built since 200017%28%
Middle year built19871979
Owner-occupied54%69%

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