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
Locations and reports
Radon Levels in Terrell County, Texas
EPA puts Terrell County in Zone 2, its middle radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Nearest county
1.0%
Midland County, 113 miles
- Midland
- 1.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 100 tests, 2007 to 2016
Ground above low
46.8%
19.5 pts above Texas
- Terrell
- 46.8%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
0
None published
A home here needs its own test
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 Terrell 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
Terrell County, At a glance
Terrell County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Terrell County is a
USGS geologic potential: Low across 53% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
No CDC test figures here
CDC has published no radon test figures for Terrell County. Midland County, 113 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Terrell County, Compared
Terrell County radon figures, compared
Calculated by Radon411No CDC figure names Terrell County, in any year or ten-year total; over the 2007 to 2016 laboratory totals, the agency's counts reach 140 Texas counties without it. Pooled across 140 Texas counties, 10.4% of reported tests reached that level; across every county in the country with a figure, 35.8%.
The nearest counties with a figure are Midland County (113 miles away) at 1.0%, Bexar County (220 miles away) at 6.6% and Lubbock County (234 miles away) at 57.8%. 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 Terrell County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 53% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Terrell County, Geology
The ground under Terrell County
PredictedUSGS's geologic map splits Terrell County: 53.2% of its land is low radon potential and 46.8% moderate. The map puts 53.2% of Terrell County in the area it calls Southern High Plains and Plateaus and 46.8% in Northern High Plains and Plateaus. USGS gives the first a radon index of 7, in the low band (5 to 8), and the second 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Southern High Plains and Plateaus | Paleozoic and Mesozoic sandstone, limestone, shale. | Low | 7 | 53.2% |
| Northern High Plains and Plateaus | Tertiary sandstone, siltstone, shale. | Moderate | 10 | 46.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Terrell County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Terrell County's is. Of the 4 counties that border it, 1 has more moderate-potential ground, Brewster County the most at 87.2%.
The map rates the ground, not the air in any home.
Local help
Terrell County, Local resources
Radon testing and mitigation in Terrell 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
Terrell County, Questions
Questions about radon in Terrell County
Are radon levels high in Terrell County?
No CDC testing statistics are published here for Terrell County, Texas yet. Of the 8 nearest counties with a figure, within 304 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 57.8%.
Which counties border Terrell County?
Terrell County borders 4 counties: Pecos County, Crockett County, Brewster County and Val Verde County.
Products
Terrell County, Products
Testing a home in Terrell County
No CDC figure names Terrell County; the nearest county with one, Midland County (113 miles away), reported 1.0% 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 Terrell 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
MonitorAEGTEST
HOUND-1011 rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Terrell County, Bordering counties
Counties bordering Terrell County
Calculated by Radon411- Radon levels in Brewster CountyEPA zone 2
50.0%at or above 4 pCi/L
Median 3.0 pCi/L · 4 tests
- Radon levels in Pecos CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Crockett CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Val Verde CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Terrell County, Residents
Who lives in Terrell County
Terrell County has been losing residents: from 752 in 2020 to 702 on July 1, 2025, a fall of 6.6% by the Census Bureau's estimates. Spread over its land, that is 0.3 people to the square mile. CDC publishes no radon test count for Terrell County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
Census lists no incorporated place in Terrell County: every home in it reads the county's figures.
Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Terrell County, Homes
Homes in Terrell County
Terrell County is a place of houses on their own lots: 95% of its 663 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1948 (1990 for Texas), and 73% date from before 1960. Owners live in 89% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.
| Homes | Terrell County | Texas |
|---|---|---|
| Housing units | 663 | 11,890,808 |
| Detached houses | 95% | 65% |
| In buildings of 5 or more | 1% | 21% |
| Mobile homes | 3% | 7% |
| Built before 1960 | 73% | 13% |
| Built since 2000 | 1% | 37% |
| Middle year built | 1948 | 1990 |
| Owner-occupied | 89% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.