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 Moody County, South Dakota
EPA puts Moody County in Zone 1, its highest radon zone, and only 20 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
85.0%
Rock County
- Rock
- 85.0%
- Minnehaha
- 59.5%
6 of 6 neighbours have 30+ tests, 2006 to 2015
Nearest county
73.7%
Lake County, 23 miles
- Lake
- 73.7%
- SD
- 58.8%
Share at 4+ pCi/L, 38 tests, 2006 to 2015
Ground above low
99.9%
0.9 pts above SD
- Moody
- 99.9%
- SD
- 99.0%
Share of land USGS rates moderate or high potential
Tests reported
20
Too few for a share
- Moody
- 20
- 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 Moody 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
Moody County, At a glance
Moody County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Moody 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 Moody County, 2008 to 2017, laboratory
CDC holds 20 reported tests for Moody 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). Moody County beside the counties around it is how this page reads it.
What these figures count
Only 20 tests were reported to CDC for Moody 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).
Moody County, Compared
Moody County radon figures, compared
Calculated by Radon411CDC's largest figure for Moody County rests on 20 tests over the 2008 to 2017 laboratory totals, 14 of them at or above 4 pCi/L, so each test moves its share by 5.0 points and no rank or comparison is drawn from it. Results reached as high as 16.7 pCi/L, with a middle value of 6.2 pCi/L.
Of the counties bordering it, 6 have a figure over the 2006 to 2015 laboratory totals: Rock County, MN reported the largest share at or above 4 pCi/L, 85.0%, and Minnehaha County the smallest, 59.5%, with Lake County at 73.7%, Pipestone County, MN at 71.9% and Lincoln County, MN at 67.7% between. Farther out, Kingsbury County (47 miles away) at 68.8%, Lincoln County (51 miles away) at 55.4% and Turner County (55 miles away) at 53.3% 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 Moody 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.
Moody County, Geology
The ground under Moody County
PredictedUSGS's geologic map puts all of Moody County's mapped land in one class: high radon potential. 99.0% of it lies in the area the map calls Loess-Covered Drift Plains, to which USGS gives a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Loess-Covered Drift Plains | Pre-Illinoian and Illinoian glacial deposits, and loess. | High | 13 | 99.0% |
| Missouri Coteau/James River Lowland/Coteau des Prairies | Glacial drift derived largely from Cretaceous marine shale. | High | 14 | 0.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Moody County beside the ground around it
Moody County has more high-potential ground than South Dakota as a whole: 99.9% of its land against 56.7%. Of the 6 counties that border it, 5 have more high-potential ground, Brookings County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Moody County, Local resources
Radon testing and mitigation in Moody 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
Moody County, Questions
Questions about radon in Moody County
Are radon levels high in Moody County?
Over the 2008 to 2017 laboratory totals, 70.0% of the radon tests reported to CDC for Moody 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: Rock County, MN reported the largest share at or above 4 pCi/L, 85.0%, and Minnehaha County the smallest, 59.5%, with Lake County at 73.7%, Pipestone County, MN at 71.9% and Lincoln County, MN at 67.7% between.
Which counties border Moody County?
Moody County borders 6 counties: Pipestone County, MN, Lake County, SD, Brookings County, SD, Minnehaha County, SD, Lincoln County, MN and Rock County, MN.
Products
Moody County, Products
Testing a home in Moody County
No CDC figure names Moody County; the nearest county with one, Lake County (23 miles away), reported 73.7% 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 Moody 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
MonitorForensics Detectors
FD-65-RADON rechargeable radon detector with a color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Moody County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Moody County
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Moody County, Bordering counties
Counties bordering Moody County
Calculated by Radon411- Radon levels in Rock County, MNEPA zone 1
85.0%at or above 4 pCi/L
Median 8.2 pCi/L · 213 tests
- Radon levels in Lake County, SDEPA zone 1
73.7%at or above 4 pCi/L
Median 8.3 pCi/L · 38 tests
- Radon levels in Pipestone County, MNEPA zone 1
71.9%at or above 4 pCi/L
Median 5.8 pCi/L · 338 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 Minnehaha County, SDEPA zone 1
59.5%at or above 4 pCi/L
Median 5.0 pCi/L · 1,522 tests
Moody County, Cities and towns
Cities and towns in Moody County
The Census Bureau estimates 6,632 residents in Moody County for July 1, 2025, 286 more than in 2020 (+4.5%). That works out to 13 people per square mile of land. Its largest town, Flandreau, has 2,396 residents, 36.1% of the total. Together its 5 incorporated places hold 54.7% of those residents; the other 45.3% live outside any of them. Reported testing is thin here: 20 tests over 2008 to 2017, or 3.0 for every 1,000 residents (2025 estimate), where South Dakota as a whole comes to 6.7.
From Flandreau to Ward, CDC publishes no figure by town: each reads Moody County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Flandreau | 2,396 | +0.8% | 36.1% |
| Colman | 696 | +9.4% | 10.5% |
| Egan | 251 | +4.6% | 3.8% |
| Trent | 242 | +17.5% | 3.6% |
| Ward | 42 | +27.3% | 0.6% |
5 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).
Moody County, Homes
Homes in Moody County
Moody County is a place of houses on their own lots: 81% of its 2,752 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 1968 (1979 for South Dakota), and 41% date from before 1960. 71% 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 | Moody County | South Dakota |
|---|---|---|
| Housing units | 2,752 | 402,364 |
| Detached houses | 81% | 67% |
| In buildings of 5 or more | 7% | 16% |
| Mobile homes | 4% | 8% |
| Built before 1960 | 41% | 29% |
| Built since 2000 | 15% | 28% |
| Middle year built | 1968 | 1979 |
| Owner-occupied | 71% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.