Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Hartley County, Texas
EPA puts Hartley County in Zone 2, its middle radon zone, and only 2 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
Nearest county
20.0%
Potter County, 50 miles
- Potter
- 20.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 70 tests, 2007 to 2016
Ground above low
100.0%
72.7 pts above Texas
- Hartley
- 100.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Hartley
- 2
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Hartley 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
Hartley County, At a glance
Hartley County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Hartley County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Hartley County, 2008 to 2017, laboratory
CDC holds 2 reported tests for Hartley County over the 2008 to 2017 laboratory totals, with a median of 6.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Hartley County beside the counties around it is how this page reads it.
What these figures count
Only 2 tests were reported to CDC for Hartley 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).
Hartley County, Compared
Hartley County radon figures, compared
Calculated by Radon411CDC's largest figure for Hartley County rests on 2 tests over the 2008 to 2017 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 10.2 pCi/L, with a middle value of 6.1 pCi/L.
The nearest counties with a figure are Potter County (50 miles away) at 20.0%, Randall County (72 miles away) at 71.4% and Lubbock County (160 miles away) at 57.8%. Pooled across 140 Texas counties, 10.4% of reported tests reached that level; across every county in the country with a figure, 35.8%.
Statewide for the same period, Randall County reported the highest share (71.4%) and Nueces County the lowest (0.0%). EPA's 1993 map puts Hartley County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Hartley County, Geology
The ground under Hartley County
PredictedUSGS's geologic map puts all of Hartley County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Northern High Plains and Plateaus, to which USGS gives a radon index of 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Northern High Plains and Plateaus | Tertiary sandstone, siltstone, shale. | Moderate | 10 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Hartley County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Hartley County's is. Of the 6 counties that border it, 1 has more high-potential ground, Union County, NM the most at 33.0%.
The map rates the ground, not the air in any home.
Local help
Hartley County, Local resources
Radon testing and mitigation in Hartley County
- Texas Radon GroupTexas Radon Group, run by Texas Tech University, does not license radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Texas.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The Texas Radon Group offers free radon test kits for Texas individuals who qualify.
- Compare kits
- Professionals in Texas7 professionals are listed in Texas.
What Texas's program says
- Licensing of radon professionals
There are no radon certification requirements for the State of Texas at this time, but the National Radon Proficiency Program lists radon testers and mitigators within Texas that have passed a rigorous national certification program.
What it means
Hartley County, Questions
Questions about radon in Hartley County
Are radon levels high in Hartley County?
Over the 2008 to 2017 laboratory totals, 50.0% of the radon tests reported to CDC for Hartley County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.1 pCi/L. Of the 8 nearest counties with a figure, within 390 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 71.4%.
Which counties border Hartley County?
Hartley County borders 6 counties: Dallam County, TX, Oldham County, TX, Moore County, TX, Sherman County, TX, Union County, NM and Quay County, NM.
Products
Hartley County, Products
Testing a home in Hartley County
No CDC figure names Hartley County; the nearest county with one, Potter County (50 miles away), reported 20.0% of its tests at or above 4 pCi/L over the 2007 to 2016 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Hartley County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Hartley County, Bordering counties
Counties bordering Hartley County
Calculated by Radon411- Radon levels in Dallam County, TXEPA zone 2
100.0%at or above 4 pCi/L
Median 4.2 pCi/L · 1 test
- Radon levels in Moore County, TXEPA zone 2
100.0%at or above 4 pCi/L
Median 4.7 pCi/L · 2 tests
- Radon levels in Union County, NMEPA zone 2
100.0%at or above 4 pCi/L
Median 4.1 pCi/L · 1 test
- Radon levels in Quay County, NMEPA zone 2
100.0%at or above 4 pCi/L
Median 5.3 pCi/L · 2 tests
- Radon levels in Sherman County, TXEPA zone 2
0.0%at or above 4 pCi/L
Median 1.3 pCi/L · 1 test
- Radon levels in Oldham County, TXEPA zone 2
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Hartley County, Cities and towns
Cities and towns in Hartley County
Hartley County has been losing residents: from 5,337 in 2020 to 4,904 on July 1, 2025, a fall of 8.1% by the Census Bureau's estimates. Spread over its land, that is 3.4 people to the square mile. Dalhart, the largest place on its list (8,377 residents in all), extends beyond Hartley County, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 2 reported tests for 2008 to 2017 come to 0.4 for every 1,000 residents (2025 estimate), against 0.1 for Texas.
From Dalhart to Channing, CDC publishes no figure by town: each reads Hartley County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Dalhartextends beyond Hartley County | 8,377 | −0.4% | Counted whole |
| Channing | 252 | −9.0% | 5.1% |
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). A place that extends beyond Hartley County is counted whole, so it has no share.
Hartley County, Homes
Homes in Hartley County
Of Hartley County's 1,808 homes, 74% are detached houses, against 65% across Texas; 16% are mobile homes. The homes are older than Texas' as a whole: half were built before 1980 (1990 for Texas), and 30% date from before 1960. Owners live in 77% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.
| Homes | Hartley County | Texas |
|---|---|---|
| Housing units | 1,808 | 11,890,808 |
| Detached houses | 74% | 65% |
| In buildings of 5 or more | 7% | 21% |
| Mobile homes | 16% | 7% |
| Built before 1960 | 30% | 13% |
| Built since 2000 | 20% | 37% |
| Middle year built | 1980 | 1990 |
| Owner-occupied | 77% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.