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 Phillips County, Kansas
EPA puts Phillips County in Zone 1, its highest radon zone, and only 11 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
71.4%
37.7 pts above KS
- Phillips
- 71.4%
- Kansas
- 33.7%
35 tests, 2019
Median result
6.0pCi/L
Action level reached
- Phillips
- 6.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2019
Tests reported
35
38th of 43 by tests
- Phillips
- 35
- Johnson
- 10,603
Reported to CDC before any fix, 2019
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Kansas
2 of 43
Top quarter
- Phillips
- 71.4%
- Jewell
- 71.9%
By share, of 43 with 30+ tests
Read a result for Phillips County
Starts at Phillips County's median, 6.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 6.0 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. Phillips County's median reported result, 2019.
The data
Phillips County, At a glance
Phillips County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Phillips 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 Phillips County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 66.7% |
| 2017 | 68.4% |
| 2018 | 40.0% |
| 2019 | 71.4% |
| 2020 | 60.0% |
| 2021 | 72.7% |
| 2022 | 54.5% |
2022: 54.5%. Across these years the share ran from 40.0% to 72.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 11 tests were reported to CDC for Phillips 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).
Phillips County, Compared
Phillips County radon figures, compared
Calculated by Radon411More than half: 71.4% of the 35 radon tests reported to CDC for Phillips County in 2019 read at least 4 pCi/L. That places it 2nd of 43 Kansas counties with 30 or more tests for the same period. That is 37.7 points above the 33.7% pooled from 102 Kansas counties.
The newest figure, in 2022, counts only 11 tests (54.5% at or above 4 pCi/L), too few to compare, so this reading uses the 35-test figure.
The median result, 6.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 25.0 pCi/L. The rest split 5.7% under 2 pCi/L and 22.9% from 2 to 4 (Kansas: 40.5% and 25.8%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 71.4% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Franklin County, NE at 65.6%, the lowest Harlan County, NE at 40.0%. 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 35 tests reported; the quietest, 2016, had 6.
Nationally, every county with a figure for the same period pools to 29.0%; Phillips County sits 42.4 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Phillips County, Geology
The ground under Phillips County
PredictedUSGS's geologic map puts all of Phillips County's mapped land in one class: high radon potential. The map puts 58.7% of Phillips County in the area it calls Smoky Hills and 41.3% in Ogallala Formation. 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 |
|---|---|---|---|---|
| Smoky Hills | Cretaceous marine sandstone, shale, and siltstone covered by discontinuous loess deposits. | High | 12 | 58.7% |
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 41.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Phillips County beside the ground around it
Phillips County has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%. Of the 7 counties that border it, none has as large a share of high-potential ground; Graham County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Phillips County, Local resources
Radon testing and mitigation in Phillips 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
Phillips County, Questions
Questions about radon in Phillips County
Are radon levels high in Phillips County?
In 2022, 54.5% of the radon tests reported to CDC for Phillips County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.1 pCi/L. Of 43 Kansas counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 33.7%.
Which counties border Phillips County?
Phillips County borders 7 counties: Harlan County, NE, Norton County, KS, Smith County, KS, Rooks County, KS, Franklin County, NE, Furnas County, NE and Graham County, KS.
Products
Phillips County, Products
Testing a home in Phillips County
In Phillips County, 71.4% of 35 tests reported to CDC in 2019 reached 4 pCi/L, against 33.7% pooled across Kansas. In Zone 1 the year-round level in Phillips 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
MonitorAranet
Radon Plus battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Approved
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
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
Phillips County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Phillips County
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Phillips County, Bordering counties
Counties bordering Phillips County
Calculated by Radon411- Radon levels in Norton County, KSEPA zone 1
90.0%at or above 4 pCi/L
Median 7.9 pCi/L · 10 tests · 18.6 points above Phillips County
- Radon levels in Rooks County, KSEPA zone 1
77.8%at or above 4 pCi/L
Median 6.0 pCi/L · 9 tests · 6.4 points above Phillips County
- Radon levels in Smith County, KSEPA zone 1
75.0%at or above 4 pCi/L
Median 7.8 pCi/L · 12 tests · 3.6 points above Phillips County
- Radon levels in Franklin County, NEEPA zone 1
65.6%at or above 4 pCi/L
Median 5.6 pCi/L · 96 tests · 5.8 points below Phillips County
- Radon levels in Furnas County, NEEPA zone 1
62.5%at or above 4 pCi/L
Median 5.5 pCi/L · 24 tests · 8.9 points below Phillips County
- Radon levels in Harlan County, NEEPA zone 1
40.0%at or above 4 pCi/L
Median 3.7 pCi/L · 60 tests · 31.4 points below Phillips County
- Radon levels in Graham County, KSEPA zone 1
No CDC figure for 2019; its page reads it against its own neighbours.
Phillips County, Cities and towns
Cities and towns in Phillips County
About 4,728 people live in Phillips County by the Census Bureau's estimate for July 1, 2025, 241 fewer than in 2020 (−4.9%). Spread over its land, that is 5.3 people to the square mile. Its largest town, Phillipsburg, has 2,225 residents, 47.1% of the total. Together its 8 incorporated places hold 69.7% of those residents; the other 30.3% live outside any of them. CDC's 35 reported tests for 2019 work out to 7.4 per 1,000 residents (2025 estimate), close to Kansas' 8.1.
From Phillipsburg to Speed, CDC publishes no figure by town: each reads Phillips County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Phillipsburg | 2,225 | −4.8% | 47.1% |
| Logan | 431 | −5.1% | 9.1% |
| Agra | 193 | −4.9% | 4.1% |
| Long Island | 132 | −5.0% | 2.8% |
| Kirwin | 129 | −4.4% | 2.7% |
| Prairie View | 99 | −5.7% | 2.1% |
| Glade | 51 | −3.8% | 1.1% |
| Speed | 36 | −5.3% | 0.8% |
8 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).
Phillips County, Homes
Homes in Phillips County
Phillips County is a place of houses on their own lots: 89% of its 2,797 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1958 (1975 for Kansas), and 53% date from before 1960. 75% 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 | Phillips County | Kansas |
|---|---|---|
| Housing units | 2,797 | 1,285,221 |
| Detached houses | 89% | 72% |
| In buildings of 5 or more | 5% | 13% |
| Mobile homes | 3% | 4% |
| Built before 1960 | 53% | 33% |
| Built since 2000 | 4% | 20% |
| Middle year built | 1958 | 1975 |
| Owner-occupied | 75% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.