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 Deuel County, South Dakota
EPA puts Deuel County in Zone 1, its highest radon zone, and only 25 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
70.9%
Yellow Medicine County
- Yellow Medicine
- 70.9%
- Grant
- 64.6%
6 of 7 neighbours have 30+ tests, 2006 to 2015
Nearest county
67.4%
Brookings County, 28 miles
- Brookings
- 67.4%
- SD
- 58.8%
Share at 4+ pCi/L, 328 tests, 2006 to 2015
Ground above low
100.0%
1.0 pts above SD
- Deuel
- 100.0%
- SD
- 99.0%
Share of land USGS rates moderate or high potential
Tests reported
27
Too few for a share
- Deuel
- 27
- Needed
- 30
2006 to 2015, 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 Deuel 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
Deuel County, At a glance
Deuel County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Deuel 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 Deuel County, 2008 to 2017, laboratory
CDC holds 25 reported tests for Deuel County over the 2008 to 2017 laboratory totals, with a median of 6.2 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Deuel County beside the counties around it is how this page reads it.
What these figures count
Only 25 tests were reported to CDC for Deuel 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).
Deuel County, Compared
Deuel County radon figures, compared
Calculated by Radon411CDC's largest figure for Deuel County rests on 27 tests over the 2006 to 2015 laboratory totals, 19 of them at or above 4 pCi/L, so each test moves its share by 3.7 points and no rank or comparison is drawn from it. Results reached as high as 79.0 pCi/L, with a middle value of 5.9 pCi/L.
Of the counties bordering it, 6 have a figure over the 2006 to 2015 laboratory totals: Yellow Medicine County, MN reported the largest share at or above 4 pCi/L, 70.9%, and Grant County the smallest, 64.6%, with Lincoln County, MN at 67.7%, Brookings County at 67.4% and Lac qui Parle County, MN at 66.1% between. Farther out, Kingsbury County (49 miles away) at 68.8%, Lake County (56 miles away) at 73.7% and Minnehaha County (75 miles away) at 59.5% 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 Deuel 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.
Deuel County, Geology
The ground under Deuel County
PredictedUSGS's geologic map puts all of Deuel County's mapped land in one class: high radon potential. The map puts 94.3% of Deuel County in the area it calls Missouri Coteau/James River Lowland/Coteau des Prairies and 5.4% in Loess-Covered Drift Plains. USGS gives the first a radon index of 14 and the second 13, both 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 | 94.3% |
| Loess-Covered Drift Plains | Pre-Illinoian and Illinoian glacial deposits, and loess. | High | 13 | 5.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Deuel County beside the ground around it
Deuel County has more high-potential ground than South Dakota as a whole: 100% of its land against 56.7%. Of the 7 counties that border it, none has as large a share of high-potential ground; Brookings County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Deuel County, Local resources
Radon testing and mitigation in Deuel 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
Deuel County, Questions
Questions about radon in Deuel County
Are radon levels high in Deuel County?
Over the 2008 to 2017 laboratory totals, 76.0% of the radon tests reported to CDC for Deuel County, South Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.2 pCi/L. Of the counties bordering it, 6 have a figure over the 2006 to 2015 laboratory totals: Yellow Medicine County, MN reported the largest share at or above 4 pCi/L, 70.9%, and Grant County the smallest, 64.6%, with Lincoln County, MN at 67.7%, Brookings County at 67.4% and Lac qui Parle County, MN at 66.1% between.
Which counties border Deuel County?
Deuel County borders 7 counties: Brookings County, SD, Hamlin County, SD, Grant County, SD, Lincoln County, MN, Lac qui Parle County, MN, Codington County, SD and Yellow Medicine County, MN.
Products
Deuel County, Products
Testing a home in Deuel County
No CDC figure names Deuel County; the nearest county with one, Brookings County (28 miles away), reported 67.4% 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 Deuel 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
RadonScan-Plus USB-powered radon monitor with Wi-Fi
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Deuel County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Deuel County
Explore
Deuel County, Bordering counties
Counties bordering Deuel County
Calculated by Radon41170.9%at or above 4 pCi/L
Median 6.2 pCi/L · 234 tests
- Radon levels in Hamlin County, SDEPA zone 1
70.6%at or above 4 pCi/L
Median 4.8 pCi/L · 17 tests
- Radon levels in Lincoln County, MNEPA zone 1
67.7%at or above 4 pCi/L
Median 7.3 pCi/L · 130 tests
- Radon levels in Brookings County, SDEPA zone 1
67.4%at or above 4 pCi/L
Median 6.4 pCi/L · 328 tests
- Radon levels in Lac qui Parle County, MNEPA zone 1
66.1%at or above 4 pCi/L
Median 5.5 pCi/L · 274 tests
- Radon levels in Codington County, SDEPA zone 1
65.3%at or above 4 pCi/L
Median 6.0 pCi/L · 72 tests
- Radon levels in Grant County, SDEPA zone 1
64.6%at or above 4 pCi/L
Median 6.0 pCi/L · 82 tests
Deuel County, Cities and towns
Cities and towns in Deuel County
The Census Bureau estimates 4,408 residents in Deuel County for July 1, 2025, 112 more than in 2020 (+2.6%). Spread over its land, that is 7.1 people to the square mile. Its largest town, Clear Lake, has 1,220 residents, 27.7% of the total. Together its 7 incorporated places hold 47.5% of those residents; the other 52.5% live outside any of them. CDC's 27 reported tests for 2006 to 2015 work out to 6.1 per 1,000 residents (2025 estimate), close to South Dakota's 5.2.
From Clear Lake to Altamont, CDC publishes no figure by town: each reads Deuel County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Clear Lake | 1,220 | −0.1% | 27.7% |
| Gary | 238 | +1.3% | 5.4% |
| Toronto | 198 | −0.5% | 4.5% |
| Goodwin | 154 | +5.5% | 3.5% |
| Astoria | 131 | −2.2% | 3.0% |
| Brandt | 119 | +3.5% | 2.7% |
| Altamont | 36 | +5.9% | 0.8% |
7 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).
Deuel County, Homes
Homes in Deuel County
Deuel County is a place of houses on their own lots: 86% of its 2,147 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 1967 (1979 for South Dakota), and 44% date from before 1960. Owners live in 81% of the occupied homes (South Dakota: 69%), so for most households a test and a fix are their own to order.
| Homes | Deuel County | South Dakota |
|---|---|---|
| Housing units | 2,147 | 402,364 |
| Detached houses | 86% | 67% |
| In buildings of 5 or more | 6% | 16% |
| Mobile homes | 3% | 8% |
| Built before 1960 | 44% | 29% |
| Built since 2000 | 16% | 28% |
| Middle year built | 1967 | 1979 |
| Owner-occupied | 81% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.