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 Erath County, Texas
EPA puts Erath County in Zone 3, its lowest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Nearest county
10.6%
Tarrant County, 65 miles
- Tarrant
- 10.6%
- Texas
- 10.4%
Share at 4+ pCi/L, 312 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Erath
- 0.0%
- 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 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Erath 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
Erath County, At a glance
Erath County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% 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 Erath County. Tarrant County, 65 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Erath County, Compared
Erath County radon figures, compared
Calculated by Radon411CDC's county radon counts over the 2007 to 2016 laboratory totals cover 140 Texas counties, and Erath County is not among them: no year's figure and no ten-year laboratory total names 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 Tarrant County (65 miles away) at 10.6%, McLennan County (76 miles away) at 17.1% and Dallas County (92 miles away) at 8.7%. 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 Erath County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Erath County, Geology
The ground under Erath County
PredictedUSGS's geologic map puts all of Erath County's mapped land in one class: low radon potential. The map puts 91.6% of Erath County in the area it calls Central Texas/Gulf Coast Plain and 8.4% in Central Texas. USGS gives both a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Texas/Gulf Coast Plain | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 91.6% |
| Central Texas | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 8.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Erath County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Erath County's is. None of the 7 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Erath County, Local resources
Radon testing and mitigation in Erath 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
Erath County, Questions
Questions about radon in Erath County
Are radon levels high in Erath County?
No CDC testing statistics are published here for Erath County, Texas yet. Of the 8 nearest counties with a figure, within 134 miles, the share of tests at or above 4 pCi/L runs from 2.0% to 17.1%.
Which counties border Erath County?
Erath County borders 7 counties: Somervell County, Comanche County, Hood County, Hamilton County, Bosque County, Eastland County and Palo Pinto County.
Products
Erath County, Products
Testing a home in Erath County
No CDC figure names Erath County; the nearest county with one, Tarrant County (65 miles away), reported 10.6% 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. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Erath County.
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
Corentium Home 2 battery digital radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Screen, app
Method: Alpha spectrometry
Readings: Every 60 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Erath County, Bordering counties
Counties bordering Erath County
Calculated by Radon411- Radon levels in Hood CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 5 tests
- Radon levels in Hamilton CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Eastland CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 3 tests
- Radon levels in Somervell CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Comanche CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Bosque CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Palo Pinto CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Erath County, Cities and towns
Cities and towns in Erath County
The Census Bureau estimates 43,911 residents in Erath County for July 1, 2025, 1,201 more than in 2020 (+2.8%). That works out to 41 people per square mile of land. Its largest town, Stephenville, has 21,793 residents, 49.6% of the total. CDC publishes no radon test count for Erath County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
From Stephenville to Hico, CDC publishes no figure by town: each reads Erath County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Stephenville | 21,793 | +3.2% | 49.6% |
| Dublin | 3,400 | +1.0% | 7.7% |
| Hicoextends beyond Erath County | 1,496 | +12.3% | Counted whole |
3 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 Erath County is counted whole, so it has no share.
Erath County, Homes
Homes in Erath County
Of Erath County's 18,515 homes, 66% are detached houses, against 65% across Texas; 14% are mobile homes. Half of its homes were built before 1989, close to Texas' 1990: 15% date from before 1960 and 34% from 2000 or later. 64% of occupied homes are lived in by their owner (Texas: 63%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Erath County | Texas |
|---|---|---|
| Housing units | 18,515 | 11,890,808 |
| Detached houses | 66% | 65% |
| In buildings of 5 or more | 12% | 21% |
| Mobile homes | 14% | 7% |
| Built before 1960 | 15% | 13% |
| Built since 2000 | 34% | 37% |
| Middle year built | 1989 | 1990 |
| Owner-occupied | 64% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.