Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Limestone County, Texas
EPA puts Limestone County in Zone 3, its lowest radon zone, and only 2 radon tests from it are on file with CDC (2007 to 2016, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
17.1%
McLennan County
- McLennan
- 17.1%
1 of 7 neighbours have 30+ tests, 2007 to 2016
Nearest county
17.1%
McLennan County, 37 miles
- McLennan
- 17.1%
- Texas
- 10.4%
Share at 4+ pCi/L, 41 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Limestone
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Limestone
- 2
- Needed
- 30
2007 to 2016, 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 Limestone 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
Limestone County, At a glance
Limestone 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 Limestone County, 2007 to 2016, laboratory
CDC holds 2 reported tests for Limestone County over the 2007 to 2016 laboratory totals, with a median of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Limestone County beside the counties around it is how this page reads it.
What these figures count
Only 2 tests were reported to CDC for Limestone County over 2007 to 2016 (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: 2007 to 2016, laboratory. Measured data period: 2005 to 2016 (every CDC figure on file).
Limestone County, Compared
Limestone County radon figures, compared
Calculated by Radon411CDC's largest figure for Limestone County rests on 2 tests over the 2007 to 2016 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 0.1 pCi/L, with a middle value of 0.1 pCi/L.
McLennan County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 17.1% of its tests at or above 4 pCi/L. Farther out, Brazos County (63 miles away) at 0.0%, Bell County (64 miles away) at 14.3% and Dallas County (85 miles away) at 8.7% 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 Limestone 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.
Limestone County, Geology
The ground under Limestone County
PredictedUSGS's geologic map puts all of Limestone 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.
Limestone County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Limestone County's is. Of the 7 counties that border it, 3 have more moderate-potential ground, Hill County the most at 54.9%.
The map rates the ground, not the air in any home.
Local help
Limestone County, Local resources
Radon testing and mitigation in Limestone 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
Limestone County, Questions
Questions about radon in Limestone County
Are radon levels high in Limestone County?
Over the 2007 to 2016 laboratory totals, 0.0% of the radon tests reported to CDC for Limestone County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. McLennan County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 17.1% of its tests at or above 4 pCi/L.
Which counties border Limestone County?
Limestone County borders 7 counties: Freestone County, Falls County, Robertson County, Leon County, Navarro County, McLennan County and Hill County.
Products
Limestone County, Products
Testing a home in Limestone County
No CDC figure names Limestone County; the nearest county with one, McLennan County (37 miles away), reported 17.1% 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 Limestone 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
EcoQube Wi-Fi continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi
- App only
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
Limestone County, Bordering counties
Counties bordering Limestone County
Calculated by Radon411- Radon levels in McLennan CountyEPA zone 3
17.1%at or above 4 pCi/L
Median 1.0 pCi/L · 41 tests
- Radon levels in Freestone CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 10 tests
- Radon levels in Robertson CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 7 tests
- Radon levels in Navarro CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 6 tests
- Radon levels in Hill CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 5 tests
- 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 Leon CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Limestone County, Cities and towns
Cities and towns in Limestone County
The Census Bureau estimates 22,849 residents in Limestone County for July 1, 2025, 708 more than in 2020 (+3.2%). That works out to 25 people per square mile of land. Its largest town, Mexia, has 7,091 residents, 31.0% of the total. Reported testing is thin here: 2 tests over 2007 to 2016, or 0.1 for every 1,000 residents (2025 estimate), where Texas as a whole comes to 0.1.
From Mexia to Tehuacana, CDC publishes no figure by town: each reads Limestone County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Mexia | 7,091 | +3.5% | 31.0% |
| Groesbeck | 3,995 | +2.5% | 17.5% |
| Martextends beyond Limestone County | 1,847 | +3.4% | Counted whole |
| Coolidge | 805 | +2.9% | 3.5% |
| Kosse | 462 | +1.3% | 2.0% |
| Thornton | 429 | +2.9% | 1.9% |
| Tehuacana | 230 | +1.3% | 1.0% |
7 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 Limestone County is counted whole, so it has no share.
Limestone County, Homes
Homes in Limestone County
Of Limestone County's 10,430 homes, 71% are detached houses, against 65% across Texas; 18% are mobile homes. Half of its homes were built before 1983, close to Texas' 1990: 19% date from before 1960 and 26% from 2000 or later. 74% 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 | Limestone County | Texas |
|---|---|---|
| Housing units | 10,430 | 11,890,808 |
| Detached houses | 71% | 65% |
| In buildings of 5 or more | 5% | 21% |
| Mobile homes | 18% | 7% |
| Built before 1960 | 19% | 13% |
| Built since 2000 | 26% | 37% |
| Middle year built | 1983 | 1990 |
| Owner-occupied | 74% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.