Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Edmunds County, South Dakota
EPA puts Edmunds County in Zone 1, its highest radon zone, and only 12 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
Share at 4+ pCi/L
61.8%
3.0 pts above SD
- Edmunds
- 61.8%
- SD
- 58.8%
68 tests, 2006 to 2015
Median result
5.0pCi/L
Action level reached
- Edmunds
- 5.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2006 to 2015
Tests reported
68
13th of 22 by tests
- Edmunds
- 68
- Minnehaha
- 1,522
Reported to CDC before any fix, 2006 to 2015
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in SD
12 of 22
Middle half
- Edmunds
- 61.8%
- Bon Homme
- 79.5%
By share, of 22 with 30+ tests
Read a result for Edmunds County
Starts at Edmunds County's median, 5.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 5.0 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. Edmunds County's median reported result, 2006 to 2015.
The data
Edmunds County, At a glance
Edmunds County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Edmunds 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 Edmunds County, 2008 to 2017, laboratory
CDC holds 12 reported tests for Edmunds County over the 2008 to 2017 laboratory totals, with a median of 5.9 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Edmunds County beside the counties around it is how this page reads it.
What these figures count
Only 12 tests were reported to CDC for Edmunds 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).
Edmunds County, Compared
Edmunds County radon figures, compared
Calculated by Radon411More than half: 61.8% of the 68 radon tests reported to CDC for Edmunds County over the 2006 to 2015 laboratory totals read at least 4 pCi/L. That places it 12th of 22 South Dakota counties with 30 or more tests for the same period. That is 3.0 points above the 58.8% pooled from 63 South Dakota counties.
The newest figure, over the 2008 to 2017 laboratory totals, counts only 12 tests (66.7% at or above 4 pCi/L), too few to compare, so this reading uses the 68-test figure.
The median result, 5.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 17.9 pCi/L. The rest split 13.2% under 2 pCi/L and 25.0% from 2 to 4 (South Dakota: 23.0% and 18.2%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 61.8% share point the same way here.
Brown County, the one bordering county with a figure for the same period, reported 59.6%. Statewide for the same period, Bon Homme County reported the highest share (79.5%) and Davison County the lowest (47.9%).
CDC's ten-year totals for Edmunds County went from 67 tests (2005 to 2014) to 12 (2008 to 2017), the share going from 61.2% to 66.7%.
Nationally, every county with a figure for the same period pools to 36.3%; Edmunds County sits 25.5 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Edmunds County, Geology
The ground under Edmunds County
PredictedUSGS's geologic map puts all of Edmunds County's mapped land in one class: high radon potential. All of it lies in the area the map calls Missouri Coteau/James River Lowland/Coteau des Prairies, to which USGS gives 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Edmunds County beside the ground around it
Edmunds County has more high-potential ground than South Dakota as a whole: 100% of its land against 56.7%. Of the 5 counties that border it, none has as large a share of high-potential ground; Faulk County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Edmunds County, Local resources
Radon testing and mitigation in Edmunds 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
Edmunds County, Questions
Questions about radon in Edmunds County
Are radon levels high in Edmunds County?
Over the 2008 to 2017 laboratory totals, 66.7% of the radon tests reported to CDC for Edmunds County, South Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.9 pCi/L. Of 22 South Dakota counties with 30 or more tests for the same period, 11 reported a higher share; pooled, the state comes to 58.8%.
Which counties border Edmunds County?
Edmunds County borders 5 counties: Faulk County, McPherson County, Walworth County, Potter County and Brown County.
Products
Edmunds County, Products
Testing a home in Edmunds County
In Edmunds County, 61.8% of 68 tests reported to CDC over the 2006 to 2015 laboratory totals reached 4 pCi/L, against 58.8% pooled across South Dakota. In Zone 1 the year-round level in Edmunds 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
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
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
Edmunds County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Edmunds County
Explore
Edmunds County, Bordering counties
Counties bordering Edmunds 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 · 38.2 points above Edmunds County
- Radon levels in Walworth CountyEPA zone 1
81.3%at or above 4 pCi/L
Median 6.1 pCi/L · 16 tests · 19.5 points above Edmunds County
- Radon levels in Brown CountyEPA zone 1
59.6%at or above 4 pCi/L
Median 4.4 pCi/L · 52 tests · 2.2 points below Edmunds County
- Radon levels in McPherson CountyEPA zone 1
52.9%at or above 4 pCi/L
Median 4.3 pCi/L · 17 tests · 8.9 points below Edmunds County
- Radon levels in Potter CountyEPA zone 1
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 1 test · 61.8 points below Edmunds County
Edmunds County, Cities and towns
Cities and towns in Edmunds County
The Census Bureau estimates 4,022 residents in Edmunds County for July 1, 2025, 40 more than in 2020 (+1.0%). Spread over its land, that is 3.6 people to the square mile. Its largest town, Ipswich, has 935 residents, 23.2% of the total. Together its 4 incorporated places hold 45.9% of those residents; the other 54.1% live outside any of them. Testing is reported here more often than across the state: CDC's 68 reported tests for 2006 to 2015 come to 16.9 for every 1,000 residents (2025 estimate), against 5.2 for South Dakota.
From Ipswich to Hosmer, CDC publishes no figure by town: each reads Edmunds County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Ipswich | 935 | +0.8% | 23.2% |
| Bowdle | 474 | +1.5% | 11.8% |
| Roscoe | 281 | +1.1% | 7.0% |
| Hosmer | 157 | Level | 3.9% |
4 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).
Edmunds County, Homes
Homes in Edmunds County
Edmunds County is a place of houses on their own lots: 87% of its 1,892 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 1966 (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 | Edmunds County | South Dakota |
|---|---|---|
| Housing units | 1,892 | 402,364 |
| Detached houses | 87% | 67% |
| In buildings of 5 or more | 1% | 16% |
| Mobile homes | 8% | 8% |
| Built before 1960 | 44% | 29% |
| Built since 2000 | 12% | 28% |
| Middle year built | 1966 | 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.