Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Spink County, South Dakota
EPA puts Spink County in Zone 1, its highest radon zone, and only 24 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
Highest bordering
63.0%
Beadle County
- Beadle
- 63.0%
- Brown
- 59.6%
2 of 6 neighbours have 30+ tests, 2006 to 2015
Nearest county
63.0%
Beadle County, 36 miles
- Beadle
- 63.0%
- SD
- 58.8%
Share at 4+ pCi/L, 46 tests, 2006 to 2015
Ground above low
100.0%
1.0 pts above SD
- Spink
- 100.0%
- SD
- 99.0%
Share of land USGS rates moderate or high potential
Tests reported
24
Too few for a share
- Spink
- 24
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Read a result for Spink County
Starts at EPA's action level
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
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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.
The data
Spink County, At a glance
Spink County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Spink County in
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 Spink County, 2008 to 2017, laboratory
CDC holds 24 reported tests for Spink County over the 2008 to 2017 laboratory totals, with a median of 3.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Spink County beside the counties around it is how this page reads it.
What these figures count
Only 24 tests were reported to CDC for Spink 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).
Spink County, Compared
Spink County radon figures, compared
Calculated by Radon411CDC's largest figure for Spink County rests on 24 tests over the 2008 to 2017 laboratory totals, 12 of them at or above 4 pCi/L, so each test moves its share by 4.2 points and no rank or comparison is drawn from it. Results reached as high as 19.6 pCi/L, with a middle value of 3.8 pCi/L.
Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Beadle County reported the largest share at or above 4 pCi/L, 63.0%, and Brown County the smallest, 59.6%. Farther out, Edmunds County (54 miles away) at 61.8%, Codington County (57 miles away) at 65.3% and Kingsbury County (58 miles away) at 68.8% 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 Spink County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Spink County, Geology
The ground under Spink County
PredictedUSGS's geologic map puts all of Spink County's mapped land in one class: high radon potential. The map puts 52.5% of Spink County in the area it calls Missouri Coteau/James River Lowland/Coteau des Prairies and 47.5% in Glacial Lake Dakota. USGS gives both a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Missouri Coteau/James River Lowland/Coteau des Prairies | Glacial drift derived largely from Cretaceous marine shale. | High | 14 | 52.5% |
| Glacial Lake Dakota | Silt and clay glacial lake deposits. | High | 14 | 47.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Spink County beside the ground around it
Spink County has more high-potential ground than South Dakota as a whole: 100% of its land against 56.7%. Of the 6 counties that border it, none has as large a share of high-potential ground; Beadle County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Spink County, Local resources
Radon testing and mitigation in Spink County
- South Dakota's radon programDepartment of Agriculture and Natural ResourcesSouth Dakota's radon program offers free or discounted test kits, and answers questions about testing and mitigation in South Dakota.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The Department of Agriculture and Natural Resources (DANR) will provide 500 free Radon test kits to South Dakota Residents.
- Compare kits
- Professionals in South Dakota5 professionals are listed in South Dakota.
What South Dakota's program says
- Phone
- 1-800-438-3367
What it means
Spink County, Questions
Questions about radon in Spink County
Are radon levels high in Spink County?
Over the 2008 to 2017 laboratory totals, 50.0% of the radon tests reported to CDC for Spink County, South Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.8 pCi/L. Of the counties bordering it, 2 have a figure over the 2006 to 2015 laboratory totals: Beadle County reported the largest share at or above 4 pCi/L, 63.0%, and Brown County the smallest, 59.6%.
Which counties border Spink County?
Spink County borders 6 counties: Clark County, Brown County, Faulk County, Beadle County, Day County and Hand County.
Products
Spink County, Products
Testing a home in Spink County
No CDC figure names Spink County; the nearest county with one, Beadle County (36 miles away), reported 63.0% 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 1 the year-round level in Spink County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
EcoQube Wi-Fi continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi
- App only
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Spink County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Spink County
Explore
Spink County, Bordering counties
Counties bordering Spink County
Calculated by Radon411- Radon levels in Faulk CountyEPA zone 1
100.0%at or above 4 pCi/L
Median 32.2 pCi/L · 1 test
- Radon levels in Hand CountyEPA zone 1
80.0%at or above 4 pCi/L
Median 4.8 pCi/L · 10 tests
- Radon levels in Clark CountyEPA zone 1
66.7%at or above 4 pCi/L
Median 6.2 pCi/L · 3 tests
- Radon levels in Beadle CountyEPA zone 1
63.0%at or above 4 pCi/L
Median 5.6 pCi/L · 46 tests
- Radon levels in Brown CountyEPA zone 1
59.6%at or above 4 pCi/L
Median 4.4 pCi/L · 52 tests
- Radon levels in Day CountyEPA zone 1
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 6 tests
Spink County, Cities and towns
Cities and towns in Spink County
About 6,155 people live in Spink County by the Census Bureau's estimate for July 1, 2025, 188 fewer than in 2020 (−3.0%). Spread over its land, that is 4.1 people to the square mile. Its largest town, Redfield, has 2,114 residents, 34.3% of the total. Together its 10 incorporated places hold 54.6% of those residents; the other 45.4% live outside any of them. Reported testing is thin here: 24 tests over 2008 to 2017, or 3.9 for every 1,000 residents (2025 estimate), where South Dakota as a whole comes to 6.7.
From Redfield to Turton, CDC publishes no figure by town: each reads Spink County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Redfield | 2,114 | −4.3% | 34.3% |
| Tulare | 206 | −1.9% | 3.3% |
| Doland | 196 | −2.5% | 3.2% |
| Mellette | 194 | −2.5% | 3.2% |
| Conde | 139 | −2.8% | 2.3% |
| Northville | 135 | −2.2% | 2.2% |
| Frankfort | 132 | −2.2% | 2.1% |
| Ashton | 104 | −1.9% | 1.7% |
| Brentford | 86 | −1.1% | 1.4% |
| Turton | 54 | −3.6% | 0.9% |
10 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).
Spink County, Homes
Homes in Spink County
Spink County is a place of houses on their own lots: 82% of its 2,989 homes are detached single-family houses, against 67% across South Dakota. The homes are older than South Dakota's as a whole: half were built before 1953 (1979 for South Dakota), and 55% date from before 1960. Owners live in 75% of the occupied homes (South Dakota: 69%), so for most households a test and a fix are their own to order.
| Homes | Spink County | South Dakota |
|---|---|---|
| Housing units | 2,989 | 402,364 |
| Detached houses | 82% | 67% |
| In buildings of 5 or more | 5% | 16% |
| Mobile homes | 8% | 8% |
| Built before 1960 | 55% | 29% |
| Built since 2000 | 13% | 28% |
| Middle year built | 1953 | 1979 |
| Owner-occupied | 75% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.