Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Somervell County, Texas
EPA puts Somervell 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, 47 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
- Somervell
- 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 Somervell 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
Somervell County, At a glance
Somervell 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 Somervell County. Tarrant County, 47 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Somervell County, Compared
Somervell County radon figures, compared
Calculated by Radon411Somervell County has no radon test figure of its own from CDC, whose counts over the 2007 to 2016 laboratory totals name 140 other Texas counties and leave it out. 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 (47 miles away) at 10.6%, McLennan County (57 miles away) at 17.1% and Dallas County (69 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 Somervell 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.
Somervell County, Geology
The ground under Somervell County
PredictedUSGS's geologic map puts all of Somervell County's mapped land in one class: low radon potential. All of it lies in the area the map calls Central Texas/Gulf Coast Plain, to which USGS gives 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Somervell County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Somervell County's is. Of the 4 counties that border it, 1 has more moderate-potential ground, Johnson County the most at 54.0%.
The map rates the ground, not the air in any home.
Local help
Somervell County, Local resources
Radon testing and mitigation in Somervell 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
Somervell County, Questions
Questions about radon in Somervell County
Are radon levels high in Somervell County?
No CDC testing statistics are published here for Somervell County, Texas yet. Of the 8 nearest counties with a figure, within 130 miles, the share of tests at or above 4 pCi/L runs from 2.0% to 17.1%.
Which counties border Somervell County?
Somervell County borders 4 counties: Hood County, Bosque County, Erath County and Johnson County.
Products
Somervell County, Products
Testing a home in Somervell County
No CDC figure names Somervell County; the nearest county with one, Tarrant County (47 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 Somervell County.
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
RadonScan USB-powered radon monitor with a color screen
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Somervell County, Bordering counties
Counties bordering Somervell 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 Johnson CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 14 tests
- 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 Erath CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Somervell County, Cities and towns
Cities and towns in Somervell County
Somervell County is growing: the Census Bureau puts it at 10,261 residents on July 1, 2025, up 11.5% from 9,206 in 2020. That works out to 55 people per square mile of land. Glen Rose, its one incorporated place, has 3,148 residents, 30.7% of the total. CDC publishes no radon test count for Somervell County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
Glen Rose is the one incorporated place here; CDC publishes no figure by town, so it reads Somervell County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Glen Rose | 3,148 | +17.6% | 30.7% |
One incorporated place, 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).
Somervell County, Homes
Homes in Somervell County
Of Somervell County's 3,967 homes, 68% are detached houses, against 65% across Texas; 25% are mobile homes. Half of its homes were built before 1996, close to Texas' 1990: 14% date from before 1960 and 42% from 2000 or later. Owners live in 82% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.
| Homes | Somervell County | Texas |
|---|---|---|
| Housing units | 3,967 | 11,890,808 |
| Detached houses | 68% | 65% |
| In buildings of 5 or more | 5% | 21% |
| Mobile homes | 25% | 7% |
| Built before 1960 | 14% | 13% |
| Built since 2000 | 42% | 37% |
| Middle year built | 1996 | 1990 |
| Owner-occupied | 82% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.