Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in San Augustine County, Texas
EPA puts San Augustine 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
9.1%
Smith County, 94 miles
- Smith
- 9.1%
- Texas
- 10.4%
Share at 4+ pCi/L, 33 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- San Augustine
- 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 San Augustine 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
San Augustine County, At a glance
San Augustine 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 San Augustine County. Smith County, 94 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
San Augustine County, Compared
San Augustine County radon figures, compared
Calculated by Radon411No CDC figure names San Augustine County, in any year or ten-year total; over the 2007 to 2016 laboratory totals, the agency's counts reach 140 Texas counties without 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 Smith County (94 miles away) at 9.1%, Montgomery County (109 miles away) at 7.1% and Harris County (129 miles away) at 3.1%. 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 San Augustine 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.
San Augustine County, Geology
The ground under San Augustine County
PredictedUSGS's geologic map puts all of San Augustine County's mapped land in one class: low radon potential. All of it lies in the area the map calls East Texas Province, to which USGS gives a radon index of 6, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| East Texas Province | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 6 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
San Augustine County beside the ground around it
Across Texas 0.5% of the land is rated high; none of San Augustine County's is. None of the 5 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
San Augustine County, Local resources
Radon testing and mitigation in San Augustine 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
San Augustine County, Questions
Questions about radon in San Augustine County
Are radon levels high in San Augustine County?
No CDC testing statistics are published here for San Augustine County, Texas yet. Of the 8 nearest counties with a figure, within 179 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 17.1%.
Which counties border San Augustine County?
San Augustine County borders 5 counties: Sabine County, Nacogdoches County, Angelina County, Shelby County and Jasper County.
Products
San Augustine County, Products
Testing a home in San Augustine County
No CDC figure names San Augustine County; the nearest county with one, Smith County (94 miles away), reported 9.1% 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 San Augustine 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
EcoQube Flex battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 15 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Best radon monitors for San Augustine County homes, compared
Explore
San Augustine County, Bordering counties
Counties bordering San Augustine County
Calculated by Radon411- Radon levels in Nacogdoches CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.0 pCi/L · 6 tests
- Radon levels in Angelina CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 3 tests
- Radon levels in Jasper CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 2 tests
- Radon levels in Sabine CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Shelby CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
San Augustine County, Cities and towns
Cities and towns in San Augustine County
About 7,722 people live in San Augustine County by the Census Bureau's estimate for July 1, 2025, 201 fewer than in 2020 (−2.5%). That works out to 15 people per square mile of land. Its largest town, San Augustine, has 1,839 residents, 23.8% of the total. Together its 2 incorporated places hold 26.1% of those residents; the other 73.9% live outside any of them. CDC publishes no radon test count for San Augustine County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
From San Augustine to Broaddus, CDC publishes no figure by town: each reads San Augustine County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| San Augustine | 1,839 | −3.9% | 23.8% |
| Broaddus | 178 | −4.3% | 2.3% |
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).
San Augustine County, Homes
Homes in San Augustine County
Of San Augustine County's 4,799 homes, 59% are detached houses, against 65% across Texas; 35% are mobile homes. Half of its homes were built before 1985, close to Texas' 1990: 14% date from before 1960 and 17% from 2000 or later. 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 | San Augustine County | Texas |
|---|---|---|
| Housing units | 4,799 | 11,890,808 |
| Detached houses | 59% | 65% |
| In buildings of 5 or more | 2% | 21% |
| Mobile homes | 35% | 7% |
| Built before 1960 | 14% | 13% |
| Built since 2000 | 17% | 37% |
| Middle year built | 1985 | 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.