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 Presidio County, Texas
EPA puts Presidio 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
0.0%
El Paso County, 170 miles
- El Paso
- 0.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 55 tests, 2007 to 2016
Ground above low
99.8%
72.6 pts above Texas
- Presidio
- 99.8%
- 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 Presidio 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
Presidio County, At a glance
Presidio County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Presidio County is a
USGS geologic potential: Moderate 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 Presidio County. El Paso County, 170 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Presidio County, Compared
Presidio County radon figures, compared
Calculated by Radon411CDC's county radon counts over the 2007 to 2016 laboratory totals cover 140 Texas counties, and Presidio 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 El Paso County (170 miles away) at 0.0%, Midland County (184 miles away) at 1.0% and Lubbock County (287 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 Presidio County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Presidio County, Geology
The ground under Presidio County
PredictedUSGS's geologic map puts all of Presidio County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Western Mountains and Basins, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Western Mountains and Basins | Precambrian igneous rocks, silicic volcanic rocks, and alluvium. | Moderate | 9 | 99.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Presidio County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Presidio County's is. Of the 3 counties that border it, 1 has more high-potential ground, Hudspeth County the most at 8.2%.
The map rates the ground, not the air in any home.
Local help
Presidio County, Local resources
Radon testing and mitigation in Presidio 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
Presidio County, Questions
Questions about radon in Presidio County
Are radon levels high in Presidio County?
No CDC testing statistics are published here for Presidio County, Texas yet. Of the 8 nearest counties with a figure, within 399 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 71.4%.
Which counties border Presidio County?
Presidio County borders 3 counties: Jeff Davis County, Brewster County and Hudspeth County.
Products
Presidio County, Products
Testing a home in Presidio County
No CDC figure names Presidio County; the nearest county with one, El Paso County (170 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. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Presidio County; a long-term test tells the year-round average.
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
MonitorX-Sense
XR0B-SR battery digital radon monitor with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Presidio County, Bordering counties
Counties bordering Presidio 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 Jeff Davis CountyEPA zone 2
28.6%at or above 4 pCi/L
Median 1.1 pCi/L · 7 tests
- Radon levels in Hudspeth CountyEPA zone 2
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Presidio County, Cities and towns
Cities and towns in Presidio County
Presidio County has been losing residents: from 6,105 in 2020 to 5,433 on July 1, 2025, a fall of 11.0% by the Census Bureau's estimates. Spread over its land, that is 1.4 people to the square mile. Presidio alone is home to 2,909 of them, 53.5% of the total. Together its 2 incorporated places hold 82.5% of those residents; the other 17.5% live outside any of them. CDC publishes no radon test count for Presidio County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
From Presidio to Marfa, CDC publishes no figure by town: each reads Presidio County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Presidio | 2,909 | −10.4% | 53.5% |
| Marfa | 1,574 | −11.8% | 29.0% |
2 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).
Presidio County, Homes
Homes in Presidio County
Of Presidio County's 3,380 homes, 67% are detached houses, against 65% across Texas; 18% are mobile homes. The homes are older than Texas' as a whole: half were built before 1977 (1990 for Texas), and 34% date from before 1960. 74% 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 | Presidio County | Texas |
|---|---|---|
| Housing units | 3,380 | 11,890,808 |
| Detached houses | 67% | 65% |
| In buildings of 5 or more | 3% | 21% |
| Mobile homes | 18% | 7% |
| Built before 1960 | 34% | 13% |
| Built since 2000 | 14% | 37% |
| Middle year built | 1977 | 1990 |
| Owner-occupied | 74% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.