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 Wallace County, Kansas
EPA puts Wallace County in Zone 1, its highest radon zone, and only 3 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
58.7%
Sherman County
- Sherman
- 58.7%
1 of 6 neighbours have 30+ tests, 2019
Nearest county
58.7%
Sherman County, 30 miles
- Sherman
- 58.7%
- Kansas
- 33.7%
Share at 4+ pCi/L, 63 tests, 2019
Ground above low
100.0%
Level with Kansas
- Wallace
- 100.0%
- Kansas
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
8
Too few for a share
- Wallace
- 8
- Needed
- 30
2017
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 Wallace 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
Wallace County, At a glance
Wallace County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Wallace 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 Wallace County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2017 | 62.5% |
| 2019 | 100.0% |
| 2020 | 100.0% |
| 2021 | 100.0% |
| 2022 | 66.7% |
2022: 66.7%. Across these years the share ran from 62.5% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 3 tests were reported to CDC for Wallace County over 2022, 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: 2022. Measured data period: 2016 to 2022 (every CDC figure on file).
Wallace County, Compared
Wallace County radon figures, compared
Calculated by Radon411CDC's largest figure for Wallace County rests on 8 tests in 2017, 5 of them at or above 4 pCi/L, so each test moves its share by 12.5 points and no rank or comparison is drawn from it. Results reached as high as 14.4 pCi/L, with a middle value of 4.4 pCi/L.
Sherman County, the one bordering county with a figure in 2019, reported 58.7% of its tests at or above 4 pCi/L. Farther out, Thomas County (48 miles away) at 45.5%, Scott County (55 miles away) at 61.5% and Finney County (82 miles away) at 30.1% have figures too. Pooled across 102 Kansas counties, 33.7% of reported tests reached that level; across every county in the country with a figure, 29.0%.
Statewide for the same period, Jewell County reported the highest share (71.9%) and Reno County the lowest (20.8%). EPA's 1993 map puts Wallace 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.
Wallace County, Geology
The ground under Wallace County
PredictedUSGS's geologic map puts all of Wallace County's mapped land in one class: high radon potential. The map puts 62.2% of Wallace County in the area it calls Ogallala Formation and 37.8% in Smoky Hills. USGS gives both a radon index of 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 62.2% |
| Smoky Hills | Cretaceous marine sandstone, shale, and siltstone covered by discontinuous loess deposits. | High | 12 | 37.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Wallace County beside the ground around it
Wallace County has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%. Of the 6 counties that border it, none has as large a share of high-potential ground; Cheyenne County, CO comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Wallace County, Local resources
Radon testing and mitigation in Wallace County
- Kansas Radon ProgramKansas Radon Program answers questions about testing, mitigation and the rules in Kansas.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Kansas178 professionals are listed in Kansas.
What Kansas's program says
- Phone
- (800) 693-5343
What it means
Wallace County, Questions
Questions about radon in Wallace County
Are radon levels high in Wallace County?
In 2022, 66.7% of the radon tests reported to CDC for Wallace County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 11.8 pCi/L. Sherman County, the one bordering county with a figure in 2019, reported 58.7% of its tests at or above 4 pCi/L.
Which counties border Wallace County?
Wallace County borders 6 counties: Greeley County, KS, Logan County, KS, Wichita County, KS, Sherman County, KS, Cheyenne County, CO and Kit Carson County, CO.
Products
Wallace County, Products
Testing a home in Wallace County
No CDC figure names Wallace County; the nearest county with one, Sherman County (30 miles away), reported 58.7% of its tests at or above 4 pCi/L in 2019, the only reading nearby until a test of this home. In Zone 1 the year-round level in Wallace 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
MonitorAEGTEST
HOUND-3786 rechargeable radon monitor with a 3.5-inch color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Ion chamber
First reading: Within 10 minutes
Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Wallace County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Wallace County
Explore
Wallace County, Bordering counties
Counties bordering Wallace County
Calculated by Radon411- Radon levels in Greeley County, KSEPA zone 1
100.0%at or above 4 pCi/L
Median 7.5 pCi/L · 1 test
- Radon levels in Kit Carson County, COEPA zone 1
84.6%at or above 4 pCi/L
Median 7.0 pCi/L · 13 tests
- Radon levels in Sherman County, KSEPA zone 1
58.7%at or above 4 pCi/L
Median 4.6 pCi/L · 63 tests
- Radon levels in Wichita County, KSEPA zone 1
33.3%at or above 4 pCi/L
Median 3.9 pCi/L · 3 tests
- Radon levels in Logan County, KSEPA zone 1
28.6%at or above 4 pCi/L
Median 3.5 pCi/L · 7 tests
- Radon levels in Cheyenne County, COEPA zone 1
0.0%at or above 4 pCi/L
Median 3.1 pCi/L · 1 test
Wallace County, Cities and towns
Cities and towns in Wallace County
About 1,441 people live in Wallace County by the Census Bureau's estimate for July 1, 2025, 71 fewer than in 2020 (−4.7%). Spread over its land, that is 1.6 people to the square mile. Its largest town, Sharon Springs, has 716 residents, 49.7% of the total. Together its 2 incorporated places hold 52.8% of those residents; the other 47.2% live outside any of them. CDC's 8 reported tests for 2017 work out to 5.6 per 1,000 residents (2025 estimate), close to Kansas' 8.0.
From Sharon Springs to Wallace, CDC publishes no figure by town: each reads Wallace County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Sharon Springs | 716 | −4.7% | 49.7% |
| Wallace | 45 | −4.3% | 3.1% |
2 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).
Wallace County, Homes
Homes in Wallace County
Wallace County is a place of houses on their own lots: 87% of its 757 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1964 (1975 for Kansas), and 44% date from before 1960. 72% of occupied homes are lived in by their owner (Kansas: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Wallace County | Kansas |
|---|---|---|
| Housing units | 757 | 1,285,221 |
| Detached houses | 87% | 72% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 4% | 4% |
| Built before 1960 | 44% | 33% |
| Built since 2000 | 4% | 20% |
| Middle year built | 1964 | 1975 |
| Owner-occupied | 72% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.