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 Runnels County, Texas
EPA puts Runnels County in Zone 3, its lowest radon zone, and only 1 radon test from it is 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
1.0%
Midland County, 121 miles
- Midland
- 1.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 100 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Runnels
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Runnels
- 1
- Needed
- 30
2008 to 2017, laboratory
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 Runnels 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
Runnels County, At a glance
Runnels 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
Radon tests reported for Runnels County, 2008 to 2017, laboratory
CDC holds 1 reported test for Runnels County over the 2008 to 2017 laboratory totals, a result of 0.7 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Runnels County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Runnels 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).
Runnels County, Compared
Runnels County radon figures, compared
Calculated by Radon411CDC's largest figure for Runnels County rests on 1 test over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 0.7 pCi/L, with a middle value of 0.7 pCi/L.
The nearest counties with a figure are Midland County (121 miles away) at 1.0%, Bell County (157 miles away) at 14.3% and Williamson County (163 miles away) at 2.0%. 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 Runnels 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.
Runnels County, Geology
The ground under Runnels County
PredictedUSGS's geologic map puts all of Runnels County's mapped land in one class: low radon potential. 98.8% of it lies in the area the map calls Central Texas, 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 | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 98.8% |
| Southern High Plains and Plateaus | Paleozoic and Mesozoic sandstone, limestone, shale. | Low | 7 | 1.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Runnels County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Runnels County's is. Of the 6 counties that border it, 1 has more moderate-potential ground, Tom Green County the most at 0.1%.
The map rates the ground, not the air in any home.
Local help
Runnels County, Local resources
Radon testing and mitigation in Runnels 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
Runnels County, Questions
Questions about radon in Runnels County
Are radon levels high in Runnels County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Runnels County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.7 pCi/L. Of the 8 nearest counties with a figure, within 186 miles, the share of tests at or above 4 pCi/L runs from 1.0% to 57.8%.
Which counties border Runnels County?
Runnels County borders 6 counties: Taylor County, Coleman County, Coke County, Nolan County, Concho County and Tom Green County.
Products
Runnels County, Products
Testing a home in Runnels County
No CDC figure names Runnels County; the nearest county with one, Midland County (121 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. 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 Runnels 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
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Runnels County, Bordering counties
Counties bordering Runnels County
Calculated by Radon411- Radon levels in Tom Green CountyEPA zone 3
33.3%at or above 4 pCi/L
Median 2.0 pCi/L · 6 tests
- Radon levels in Taylor CountyEPA zone 3
11.1%at or above 4 pCi/L
Median 0.6 pCi/L · 18 tests
- Radon levels in Nolan CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 3 tests
- Radon levels in Coleman CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Coke CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Concho CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Runnels County, Cities and towns
Cities and towns in Runnels County
About 9,693 people live in Runnels County by the Census Bureau's estimate for July 1, 2025, 223 fewer than in 2020 (−2.2%). Spread over its land, that is 9.2 people to the square mile. Its largest town, Ballinger, has 3,499 residents, 36.1% of the total. Together its 3 incorporated places hold 69.0% of those residents; the other 31.0% live outside any of them. CDC's 1 reported test for 2008 to 2017 work out to 0.1 per 1,000 residents (2025 estimate), close to Texas' 0.1.
From Ballinger to Miles, CDC publishes no figure by town: each reads Runnels County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Ballinger | 3,499 | −3.7% | 36.1% |
| Winters | 2,263 | −3.7% | 23.3% |
| Miles | 931 | +6.2% | 9.6% |
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).
Runnels County, Homes
Homes in Runnels County
Runnels County is a place of houses on their own lots: 89% of its 4,989 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1958 (1990 for Texas), and 55% date from before 1960. 75% 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 | Runnels County | Texas |
|---|---|---|
| Housing units | 4,989 | 11,890,808 |
| Detached houses | 89% | 65% |
| In buildings of 5 or more | under 1% | 21% |
| Mobile homes | 6% | 7% |
| Built before 1960 | 55% | 13% |
| Built since 2000 | 8% | 37% |
| Middle year built | 1958 | 1990 |
| Owner-occupied | 75% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.