Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Seward County, Kansas
EPA puts Seward County in Zone 2, its middle radon zone, and only 21 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
Share at 4+ pCi/L
52.2%
18.5 pts above KS
- Seward
- 52.2%
- Kansas
- 33.7%
92 tests, 2019
Median result
4.0pCi/L
Action level reached
- Seward
- 4.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2019
Tests reported
92
22nd of 43 by tests
- Seward
- 92
- Johnson
- 10,603
Reported to CDC before any fix, 2019
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Kansas
9 of 43
Top quarter
- Seward
- 52.2%
- Jewell
- 71.9%
By share, of 43 with 30+ tests
Read a result for Seward County
Starts at Seward County's median, 4.0 pCi/L
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. Seward County's median reported result, 2019.
The data
Seward County, At a glance
Seward County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Seward County is a
USGS geologic potential: Moderate across 75% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Seward County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 18.2% |
| 2017 | 40.0% |
| 2018 | 14.3% |
| 2019 | 52.2% |
| 2020 | 7.1% |
| 2021 | 18.2% |
| 2022 | 9.5% |
2022: 9.5%. Across these years the share ran from 7.1% to 52.2%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 21 tests were reported to CDC for Seward 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).
Seward County, Compared
Seward County radon figures, compared
Calculated by Radon411More than half: 52.2% of the 92 radon tests reported to CDC for Seward County in 2019 read at least 4 pCi/L. That places it 9th of 43 Kansas counties with 30 or more tests for the same period. That is 18.5 points above the 33.7% pooled from 102 Kansas counties.
The newest figure, in 2022, counts only 21 tests (9.5% at or above 4 pCi/L), too few to compare, so this reading uses the 92-test figure.
The median result, 4.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 20.2 pCi/L. The rest split 29.3% under 2 pCi/L and 18.5% from 2 to 4 (Kansas: 40.5% and 25.8%). The reported tests do not follow EPA's Zone 2 label for Seward County (predicted average between 2 and 4 pCi/L): 52.2% of them reached 4 pCi/L, fewer than that label suggests.
Statewide for the same period, Jewell County reported the highest share (71.9%) and Reno County the lowest (20.8%).
The busiest year on file was 2019, with 92 tests reported; the quietest, 2018, had 7.
Nationally, every county with a figure for the same period pools to 29.0%; Seward County sits 23.2 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Seward County, Geology
The ground under Seward County
PredictedUSGS's geologic map splits Seward County: 74.7% of its land is moderate radon potential and 25.3% high. The map puts 74.7% of Seward County in the area it calls Cimmaron River Valley and 25.3% in Ogallala Formation. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Cimmaron River Valley | Tertiary and Quaternary sandstone, siltstone, shale, and alluvium overlain by eolian sand and loess. | Moderate | 10 | 74.7% |
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 25.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Seward County beside the ground around it
Kansas as a whole has more high-potential ground than Seward County: 59.9% of its land, against 25.3% here. Of the 5 counties that border it, 2 have more high-potential ground, Haskell County the most at 91.7%.
The map rates the ground, not the air in any home.
Local help
Seward County, Local resources
Radon testing and mitigation in Seward 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
Seward County, Questions
Questions about radon in Seward County
Are radon levels high in Seward County?
In 2022, 9.5% of the radon tests reported to CDC for Seward County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.9 pCi/L. Of 43 Kansas counties with 30 or more tests for the same period, 8 reported a higher share; pooled, the state comes to 33.7%.
Which counties border Seward County?
Seward County borders 5 counties: Stevens County, KS, Meade County, KS, Haskell County, KS, Beaver County, OK and Texas County, OK.
Products
Seward County, Products
Testing a home in Seward County
In Seward County, 52.2% of 92 tests reported to CDC in 2019 reached 4 pCi/L, against 33.7% pooled across Kansas. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Seward County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
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
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
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Seward County, Bordering counties
Counties bordering Seward County
Calculated by Radon411- Radon levels in Haskell County, KSEPA zone 1
50.0%at or above 4 pCi/L
Median 5.5 pCi/L · 2 tests · 2.2 points below Seward County
- Radon levels in Stevens County, KSEPA zone 2
36.0%at or above 4 pCi/L
Median 2.6 pCi/L · 25 tests · 16.2 points below Seward County
- Radon levels in Meade County, KSEPA zone 1
33.3%at or above 4 pCi/L
Median 2.7 pCi/L · 6 tests · 18.9 points below Seward County
- Radon levels in Beaver County, OKEPA zone 2
No CDC figure for 2019; its page reads it against its own neighbours.
- Radon levels in Texas County, OKEPA zone 2
No CDC figure for 2019; its page reads it against its own neighbours.
Seward County, Cities and towns
Cities and towns in Seward County
About 21,073 people live in Seward County by the Census Bureau's estimate for July 1, 2025, 784 fewer than in 2020 (−3.6%). That works out to 33 people per square mile of land. Liberal alone is home to 19,010 of them, 90.2% of the total. Together its 2 incorporated places hold 91.8% of those residents; the other 8.2% live outside any of them. Reported testing is thin here: 92 tests over 2019, or 4.4 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 8.1.
From Liberal to Kismet, CDC publishes no figure by town: each reads Seward County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Liberal | 19,010 | −3.7% | 90.2% |
| Kismet | 332 | −2.1% | 1.6% |
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).
Seward County, Homes
Homes in Seward County
Of Seward County's 8,299 homes, 65% are detached houses, against 72% across Kansas; 13% are mobile homes. Half of its homes were built before 1972, close to Kansas' 1975: 29% date from before 1960 and 12% from 2000 or later. 61% 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 | Seward County | Kansas |
|---|---|---|
| Housing units | 8,299 | 1,285,221 |
| Detached houses | 65% | 72% |
| In buildings of 5 or more | 9% | 13% |
| Mobile homes | 13% | 4% |
| Built before 1960 | 29% | 33% |
| Built since 2000 | 12% | 20% |
| Middle year built | 1972 | 1975 |
| Owner-occupied | 61% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.