Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Walker County, Texas
EPA puts Walker County in Zone 3, its lowest radon zone, and only 7 radon tests from it are 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
Highest bordering
7.1%
Montgomery County
- Montgomery
- 7.1%
1 of 6 neighbours have 30+ tests, 2007 to 2016
Nearest county
7.1%
Montgomery County, 31 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
- Walker
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
7
Too few for a share
- Walker
- 7
- 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 Walker 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
Walker County, At a glance
Walker 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 Walker County, 2008 to 2017, laboratory
CDC holds 7 reported tests for Walker County over the 2008 to 2017 laboratory totals, with a median of 0.5 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Walker County beside the counties around it is how this page reads it.
What these figures count
Only 7 tests were reported to CDC for Walker 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).
Walker County, Compared
Walker County radon figures, compared
Calculated by Radon411CDC's largest figure for Walker County rests on 7 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 14.3 points and no rank or comparison is drawn from it. Results reached as high as 0.7 pCi/L, with a middle value of 0.5 pCi/L.
Montgomery County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 7.1% of its tests at or above 4 pCi/L. Farther out, Brazos County (44 miles away) at 0.0%, Harris County (62 miles away) at 3.1% and Fort Bend County (84 miles away) at 3.4% have figures too. 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 Walker 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.
Walker County, Geology
The ground under Walker County
PredictedUSGS's geologic map puts all of Walker County's mapped land in one class: low radon potential. The map puts 64.9% of Walker County in the area it calls Coastal Plain and 35.1% in East Texas Province. USGS gives the first a radon index of 7 and the second 6, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coastal Plain | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 64.9% |
| East Texas Province | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 6 | 35.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Walker County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Walker County's is. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Walker County, Local resources
Radon testing and mitigation in Walker 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
Walker County, Questions
Questions about radon in Walker County
Are radon levels high in Walker County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Walker County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.5 pCi/L. Montgomery County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 7.1% of its tests at or above 4 pCi/L.
Which counties border Walker County?
Walker County borders 6 counties: Madison County, San Jacinto County, Grimes County, Montgomery County, Houston County and Trinity County.
Products
Walker County, Products
Testing a home in Walker County
No CDC figure names Walker County; the nearest county with one, Montgomery County (31 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 Walker 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
RadonScan-Plus USB-powered radon monitor with Wi-Fi
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Walker County, Bordering counties
Counties bordering Walker County
Calculated by Radon411- Radon levels in Montgomery CountyEPA zone 3
7.1%at or above 4 pCi/L
Median 0.6 pCi/L · 85 tests
- Radon levels in Madison CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.5 pCi/L · 1 test
- Radon levels in Grimes CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in San Jacinto CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- 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 Trinity CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Walker County, Cities and towns
Cities and towns in Walker County
Walker County is growing: the Census Bureau puts it at 83,842 residents on July 1, 2025, up 9.5% from 76,562 in 2020. That works out to 107 people per square mile of land. Huntsville alone is home to 49,088 of them, 58.5% of the total. Together its 3 incorporated places hold 60.5% of those residents; the other 39.5% live outside any of them. Reported testing is thin here: 7 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Texas as a whole comes to 0.1.
From Huntsville to Riverside, CDC publishes no figure by town: each reads Walker County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Huntsville | 49,088 | +7.0% | 58.5% |
| New Waverly | 1,031 | +12.8% | 1.2% |
| Riverside | 612 | +16.6% | 0.7% |
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).
Walker County, Homes
Homes in Walker County
Fewer than six in ten of Walker County's 29,626 homes are detached houses (51%, against 65% across Texas); the rest are attached, in shared buildings or mobile. Half of its homes were built before 1989, close to Texas' 1990: 5% date from before 1960 and 31% from 2000 or later. 57% 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 | Walker County | Texas |
|---|---|---|
| Housing units | 29,626 | 11,890,808 |
| Detached houses | 51% | 65% |
| In buildings of 5 or more | 21% | 21% |
| Mobile homes | 19% | 7% |
| Built before 1960 | 5% | 13% |
| Built since 2000 | 31% | 37% |
| Middle year built | 1989 | 1990 |
| Owner-occupied | 57% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.