Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Waller County, Texas
EPA puts Waller 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%
- Harris
- 3.1%
3 of 6 neighbours have 30+ tests, 2007 to 2016
Nearest county
7.1%
Montgomery County, 35 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
- Waller
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
7
Too few for a share
- Waller
- 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 Waller 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
Waller County, At a glance
Waller 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 Waller County, 2008 to 2017, laboratory
CDC holds 7 reported tests for Waller County over the 2008 to 2017 laboratory totals, with a median of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Waller County beside the counties around it is how this page reads it.
What these figures count
Only 7 tests were reported to CDC for Waller 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).
Waller County, Compared
Waller County radon figures, compared
Calculated by Radon411CDC's largest figure for Waller 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 0.8 pCi/L, with a middle value of 0.1 pCi/L.
Of the counties bordering it, 3 have a figure over the 2007 to 2016 laboratory totals: Montgomery County reported the largest share at or above 4 pCi/L, 7.1%, and Harris County the smallest, 3.1%, with Fort Bend County at 3.4% between. Farther out, Brazos County (49 miles away) at 0.0%, Brazoria County (65 miles away) at 6.3% and Galveston County (75 miles away) at 0.0% 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 Waller 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.
Waller County, Geology
The ground under Waller County
PredictedUSGS's geologic map puts all of Waller County's mapped land in one class: low radon potential. All of it lies in the area the map calls Coastal 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 |
|---|---|---|---|---|
| Coastal 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.
Waller County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Waller 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
Waller County, Local resources
Radon testing and mitigation in Waller 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.
Listed radon professionals by town: Houston
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
Waller County, Questions
Questions about radon in Waller County
Are radon levels high in Waller County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Waller County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the counties bordering it, 3 have a figure over the 2007 to 2016 laboratory totals: Montgomery County reported the largest share at or above 4 pCi/L, 7.1%, and Harris County the smallest, 3.1%, with Fort Bend County at 3.4% between.
Which counties border Waller County?
Waller County borders 6 counties: Austin County, Washington County, Fort Bend County, Montgomery County, Harris County and Grimes County.
Products
Waller County, Products
Testing a home in Waller County
No CDC figure names Waller County; the nearest county with one, Montgomery County (35 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 Waller 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
MonitorForensics Detectors
FD-65-RADON rechargeable radon detector with a 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
Waller County, Bordering counties
Counties bordering Waller 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 Fort Bend CountyEPA zone 3
3.4%at or above 4 pCi/L
Median 0.2 pCi/L · 117 tests
- Radon levels in Harris CountyEPA zone 3
3.1%at or above 4 pCi/L
Median 0.2 pCi/L · 775 tests
- Radon levels in Austin CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 2 tests
- 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 Washington CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Waller County, Cities and towns
Cities and towns in Waller County
Waller County is growing: the Census Bureau puts it at 69,858 residents on July 1, 2025, up 21.9% from 57,294 in 2020. That works out to 136 people per square mile of land. Houston, the largest place on its list (2,397,315 residents in all), extends beyond Waller County, so no share of the total is worked out for it. CDC's 7 reported tests for 2008 to 2017 work out to 0.1 per 1,000 residents (2025 estimate), close to Texas' 0.1.
From Houston to Pattison, CDC publishes no figure by town: each reads Waller County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Houstonextends beyond Waller County | 2,397,315 | +4.3% | Counted whole |
| Katyextends beyond Waller County | 28,373 | +26.5% | Counted whole |
| Prairie View | 8,969 | +9.4% | 12.8% |
| Hempstead | 7,194 | +30.9% | 10.3% |
| Brookshire | 6,090 | +19.1% | 8.7% |
| Wallerextends beyond Waller County | 5,380 | +99.0% | Counted whole |
| Pine Island | 1,271 | +16.9% | 1.8% |
| Pattison | 672 | +21.7% | 1.0% |
Places in Waller County with a city page: 1 of 1
8 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). A place that extends beyond Waller County is counted whole, so it has no share.
Waller County, Homes
Homes in Waller County
Of Waller County's 19,946 homes, 64% are detached houses, against 65% across Texas; 20% are mobile homes. Half of its homes were built before 1997, close to Texas' 1990: 6% date from before 1960 and 45% from 2000 or later. 71% 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 | Waller County | Texas |
|---|---|---|
| Housing units | 19,946 | 11,890,808 |
| Detached houses | 64% | 65% |
| In buildings of 5 or more | 7% | 21% |
| Mobile homes | 20% | 7% |
| Built before 1960 | 6% | 13% |
| Built since 2000 | 45% | 37% |
| Middle year built | 1997 | 1990 |
| Owner-occupied | 71% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.