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 Trinity County, Texas
EPA puts Trinity 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
7.1%
Montgomery County, 59 miles
- Montgomery
- 7.1%
- Texas
- 10.4%
Share at 4+ pCi/L, 85 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Trinity
- 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 Trinity 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
Trinity County, At a glance
Trinity 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 Trinity County. Montgomery County, 59 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Trinity County, Compared
Trinity County radon figures, compared
Calculated by Radon411No CDC figure names Trinity 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 Montgomery County (59 miles away) at 7.1%, Brazos County (75 miles away) at 0.0% and Harris County (86 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 Trinity 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.
Trinity County, Geology
The ground under Trinity County
PredictedUSGS's geologic map puts all of Trinity County's mapped land in one class: low radon potential. The map puts 91.7% of Trinity County in the area it calls East Texas Province and 8.3% in Coastal Plain. USGS gives the first a radon index of 6 and the second 7, both 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 | 91.7% |
| Coastal Plain | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 8.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Trinity County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Trinity 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
Trinity County, Local resources
Radon testing and mitigation in Trinity 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
Trinity County, Questions
Questions about radon in Trinity County
Are radon levels high in Trinity County?
No CDC testing statistics are published here for Trinity County, Texas yet. Of the 8 nearest counties with a figure, within 132 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 17.1%.
Which counties border Trinity County?
Trinity County borders 5 counties: Houston County, Polk County, Angelina County, San Jacinto County and Walker County.
Products
Trinity County, Products
Testing a home in Trinity County
No CDC figure names Trinity County; the nearest county with one, Montgomery County (59 miles away), reported 7.1% 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 Trinity 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
MonitorPYZYCKYH
RD17 plug-in radon detector with a rechargeable battery and color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Trinity County, Bordering counties
Counties bordering Trinity County
Calculated by Radon411- Radon levels in Polk CountyEPA zone 3
100.0%at or above 4 pCi/L
Median 25.5 pCi/L · 1 test
- 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 Walker CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.5 pCi/L · 7 tests
- Radon levels in Houston CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in San Jacinto CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Trinity County, Cities and towns
Cities and towns in Trinity County
Trinity County is growing: the Census Bureau puts it at 14,384 residents on July 1, 2025, up 5.5% from 13,636 in 2020. That works out to 21 people per square mile of land. No town dominates: Trinity, the largest, has 2,450 residents, 17.0% of the total. Together its 2 incorporated places hold 23.4% of those residents; the other 76.6% live outside any of them. CDC publishes no radon test count for Trinity County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
From Trinity to Groveton, CDC publishes no figure by town: each reads Trinity County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Trinity | 2,450 | +4.5% | 17.0% |
| Groveton | 922 | +0.8% | 6.4% |
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).
Trinity County, Homes
Homes in Trinity County
Of Trinity County's 8,261 homes, 57% are detached houses, against 65% across Texas; 38% are mobile homes. Half of its homes were built before 1988, close to Texas' 1990: 11% date from before 1960 and 29% from 2000 or later. Owners live in 78% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.
| Homes | Trinity County | Texas |
|---|---|---|
| Housing units | 8,261 | 11,890,808 |
| Detached houses | 57% | 65% |
| In buildings of 5 or more | 1% | 21% |
| Mobile homes | 38% | 7% |
| Built before 1960 | 11% | 13% |
| Built since 2000 | 29% | 37% |
| Middle year built | 1988 | 1990 |
| Owner-occupied | 78% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.