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 Hyde County, South Dakota
EPA puts Hyde County in Zone 1, its highest radon zone, and only 7 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
66.7%
Hughes County
- Hughes
- 66.7%
1 of 7 neighbours have 30+ tests, 2006 to 2015
Nearest county
66.7%
Hughes County, 27 miles
- Hughes
- 66.7%
- SD
- 58.8%
Share at 4+ pCi/L, 30 tests, 2006 to 2015
Ground above low
100.0%
1.0 pts above SD
- Hyde
- 100.0%
- SD
- 99.0%
Share of land USGS rates moderate or high potential
Tests reported
7
Too few for a share
- Hyde
- 7
- 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 Hyde 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
Hyde County, At a glance
Hyde County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Hyde 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 Hyde County, 2008 to 2017, laboratory
CDC holds 7 reported tests for Hyde County over the 2008 to 2017 laboratory totals, with a median of 4.9 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Hyde County beside the counties around it is how this page reads it.
What these figures count
Only 7 tests were reported to CDC for Hyde 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).
Hyde County, Compared
Hyde County radon figures, compared
Calculated by Radon411CDC's largest figure for Hyde County rests on 7 tests over the 2008 to 2017 laboratory totals, 4 of them at or above 4 pCi/L, so each test moves its share by 14.3 points and no rank or comparison is drawn from it. Results reached as high as 8.8 pCi/L, with a middle value of 4.9 pCi/L.
Hughes County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 66.7% of its tests at or above 4 pCi/L. Farther out, Beadle County (60 miles away) at 63.0%, Brule County (61 miles away) at 62.5% and Edmunds County (62 miles away) at 61.8% 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 Hyde 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.
Hyde County, Geology
The ground under Hyde County
PredictedUSGS's geologic map puts all of Hyde 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.
Hyde County beside the ground around it
Hyde 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; Buffalo County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Hyde County, Local resources
Radon testing and mitigation in Hyde 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
Hyde County, Questions
Questions about radon in Hyde County
Are radon levels high in Hyde County?
Over the 2008 to 2017 laboratory totals, 57.1% of the radon tests reported to CDC for Hyde County, South Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.9 pCi/L. Hughes County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 66.7% of its tests at or above 4 pCi/L.
Which counties border Hyde County?
Hyde County borders 7 counties: Hughes County, Hand County, Buffalo County, Sully County, Lyman County, Faulk County and Potter County.
Products
Hyde County, Products
Testing a home in Hyde County
No CDC figure names Hyde County; the nearest county with one, Hughes County (27 miles away), reported 66.7% 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 Hyde 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
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
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
Hyde County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Hyde County
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Hyde County, Bordering counties
Counties bordering Hyde County
Calculated by Radon411- Radon levels in Buffalo CountyEPA zone 1
100.0%at or above 4 pCi/L
Median 10.9 pCi/L · 1 test
- Radon levels in Sully CountyEPA zone 1
100.0%at or above 4 pCi/L
Median 4.1 pCi/L · 1 test
- Radon levels in Lyman CountyEPA zone 1
100.0%at or above 4 pCi/L
Median 20.0 pCi/L · 5 tests
- 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 Hughes CountyEPA zone 1
66.7%at or above 4 pCi/L
Median 5.5 pCi/L · 30 tests
- Radon levels in Potter CountyEPA zone 1
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 1 test
Hyde County, Cities and towns
Cities and towns in Hyde County
About 1,191 people live in Hyde County by the Census Bureau's estimate for July 1, 2025, 57 fewer than in 2020 (−4.6%). Spread over its land, that is 1.4 people to the square mile. Highmore, its one incorporated place, has 634 residents, 53.2% of the total. CDC's 7 reported tests for 2008 to 2017 work out to 5.9 per 1,000 residents (2025 estimate), close to South Dakota's 6.7.
Highmore is the one incorporated place here; CDC publishes no figure by town, so it reads Hyde County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Highmore | 634 | −5.2% | 53.2% |
One incorporated place, 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).
Hyde County, Homes
Homes in Hyde County
Hyde County is a place of houses on their own lots: 89% of its 632 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 1958 (1979 for South Dakota), and 52% date from before 1960. Owners live in 82% of the occupied homes (South Dakota: 69%), so for most households a test and a fix are their own to order.
| Homes | Hyde County | South Dakota |
|---|---|---|
| Housing units | 632 | 402,364 |
| Detached houses | 89% | 67% |
| In buildings of 5 or more | 1% | 16% |
| Mobile homes | 8% | 8% |
| Built before 1960 | 52% | 29% |
| Built since 2000 | 6% | 28% |
| Middle year built | 1958 | 1979 |
| Owner-occupied | 82% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.