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 Brooks County, Texas
EPA puts Brooks 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
0.0%
Nueces County, 61 miles
- Nueces
- 0.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 45 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Brooks
- 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 Brooks 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
Brooks County, At a glance
Brooks 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 Brooks County. Nueces County, 61 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Brooks County, Compared
Brooks County radon figures, compared
Calculated by Radon411Brooks 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 Nueces County (61 miles away) at 0.0%, Bexar County (167 miles away) at 6.6% and Brazoria County (225 miles away) at 6.3%. 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 Brooks 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.
Brooks County, Geology
The ground under Brooks County
PredictedUSGS's geologic map puts all of Brooks County's mapped land in one class: low radon potential. All of it lies in the area the map calls South Texas 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 |
|---|---|---|---|---|
| South Texas 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.
Brooks County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Brooks 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
Brooks County, Local resources
Radon testing and mitigation in Brooks 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
Brooks County, Questions
Questions about radon in Brooks County
Are radon levels high in Brooks County?
No CDC testing statistics are published here for Brooks County, Texas yet. Of the 8 nearest counties with a figure, within 260 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 9.3%.
Which counties border Brooks County?
Brooks County borders 7 counties: Kenedy County, Jim Hogg County, Hidalgo County, Kleberg County, Starr County, Jim Wells County and Duval County.
Products
Brooks County, Products
Testing a home in Brooks County
No CDC figure names Brooks County; the nearest county with one, Nueces County (61 miles away), reported 0.0% 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 Brooks 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
Brooks County, Bordering counties
Counties bordering Brooks County
Calculated by Radon411- Radon levels in Hidalgo CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 15 tests
- Radon levels in Starr CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 1 test
- Radon levels in Jim Wells CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Kenedy CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Jim Hogg CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Kleberg CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Duval CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Brooks County, Cities and towns
Cities and towns in Brooks County
Brooks County has been losing residents: from 7,095 in 2020 to 6,579 on July 1, 2025, a fall of 7.3% by the Census Bureau's estimates. Spread over its land, that is 7.0 people to the square mile. Falfurrias, its one incorporated place, has 4,248 residents, 64.6% of the total. CDC publishes no radon test count for Brooks County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
Falfurrias is the one incorporated place here; CDC publishes no figure by town, so it reads Brooks County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Falfurrias | 4,248 | −8.4% | 64.6% |
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).
Brooks County, Homes
Homes in Brooks County
Brooks County is a place of houses on their own lots: 76% of its 3,856 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1970 (1990 for Texas), and 41% date from before 1960. 53% 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 | Brooks County | Texas |
|---|---|---|
| Housing units | 3,856 | 11,890,808 |
| Detached houses | 76% | 65% |
| In buildings of 5 or more | 4% | 21% |
| Mobile homes | 11% | 7% |
| Built before 1960 | 41% | 13% |
| Built since 2000 | 19% | 37% |
| Middle year built | 1970 | 1990 |
| Owner-occupied | 53% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.