Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Robertson County, Texas
EPA puts Robertson 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
0.0%
Brazos County
- Brazos
- 0.0%
1 of 7 neighbours have 30+ tests, 2007 to 2016
Nearest county
0.0%
Brazos County, 28 miles
- Brazos
- 0.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 49 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Robertson
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
10
Too few for a share
- Robertson
- 10
- Needed
- 30
2005 to 2014, 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 Robertson 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
Robertson County, At a glance
Robertson 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 Robertson County, 2008 to 2017, laboratory
CDC holds 7 reported tests for Robertson County over the 2008 to 2017 laboratory totals, with a median of 0.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Robertson County beside the counties around it is how this page reads it.
What these figures count
Only 7 tests were reported to CDC for Robertson 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).
Robertson County, Compared
Robertson County radon figures, compared
Calculated by Radon411CDC's largest figure for Robertson County rests on 10 tests over the 2005 to 2014 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 10.0 points and no rank or comparison is drawn from it. Results reached as high as 1.6 pCi/L, with a middle value of 0.8 pCi/L.
Brazos County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 0.0% of its tests at or above 4 pCi/L. Farther out, McLennan County (55 miles away) at 17.1%, Bell County (57 miles away) at 14.3% and Williamson County (70 miles away) at 2.0% 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 Robertson 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.
Robertson County, Geology
The ground under Robertson County
PredictedUSGS's geologic map puts all of Robertson 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.
Robertson County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Robertson County's is. Of the 7 counties that border it, 1 has more moderate-potential ground, Falls County the most at 0.4%.
The map rates the ground, not the air in any home.
Local help
Robertson County, Local resources
Radon testing and mitigation in Robertson 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
Robertson County, Questions
Questions about radon in Robertson County
Are radon levels high in Robertson County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Robertson County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.8 pCi/L. Brazos County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 0.0% of its tests at or above 4 pCi/L.
Which counties border Robertson County?
Robertson County borders 7 counties: Brazos County, Falls County, Limestone County, Milam County, Madison County, Leon County and Burleson County.
Products
Robertson County, Products
Testing a home in Robertson County
No CDC figure names Robertson County; the nearest county with one, Brazos County (28 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. 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 Robertson 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
RadonEye RD200 plug-in continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Robertson County, Bordering counties
Counties bordering Robertson County
Calculated by Radon411- Radon levels in Brazos CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.2 pCi/L · 49 tests
- Radon levels in Limestone CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 2 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 Falls CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Milam CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Leon CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Burleson CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Robertson County, Cities and towns
Cities and towns in Robertson County
Robertson County is growing: the Census Bureau puts it at 17,839 residents on July 1, 2025, up 6.4% from 16,767 in 2020. That works out to 21 people per square mile of land. Its largest town, Hearne, has 4,719 residents, 26.5% of the total. Together its 4 incorporated places hold 47.1% of those residents; the other 52.9% live outside any of them. Testing is reported here more often than across the state: CDC's 10 reported tests for 2005 to 2014 come to 0.6 for every 1,000 residents (2025 estimate), against 0.1 for Texas.
From Hearne to Bremond, CDC publishes no figure by town: each reads Robertson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Hearne | 4,719 | +4.1% | 26.5% |
| Franklin | 1,805 | +12.1% | 10.1% |
| Calvert | 985 | +3.2% | 5.5% |
| Bremond | 894 | +4.0% | 5.0% |
4 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).
Robertson County, Homes
Homes in Robertson County
Of Robertson County's 8,559 homes, 69% are detached houses, against 65% across Texas; 19% are mobile homes. The homes are older than Texas' as a whole: half were built before 1982 (1990 for Texas), and 19% date from before 1960. 73% 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 | Robertson County | Texas |
|---|---|---|
| Housing units | 8,559 | 11,890,808 |
| Detached houses | 69% | 65% |
| In buildings of 5 or more | 1% | 21% |
| Mobile homes | 19% | 7% |
| Built before 1960 | 19% | 13% |
| Built since 2000 | 28% | 37% |
| Middle year built | 1982 | 1990 |
| Owner-occupied | 73% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.