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 Falls County, Texas
EPA puts Falls 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
Highest bordering
17.1%
McLennan County
- McLennan
- 17.1%
- Bell
- 14.3%
2 of 5 neighbours have 30+ tests, 2007 to 2016
Nearest county
17.1%
McLennan County, 26 miles
- McLennan
- 17.1%
- Texas
- 10.4%
Share at 4+ pCi/L, 41 tests, 2007 to 2016
Ground above low
0.4%
26.9 pts below Texas
- Falls
- 0.4%
- 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 Falls 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
Falls County, At a glance
Falls 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 Falls County. Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: McLennan County reported the largest share at or above 4 pCi/L, 17.1%, and Bell County the smallest, 14.3%.
Falls County, Compared
Falls County radon figures, compared
Calculated by Radon411CDC's county radon counts over the 2007 to 2016 laboratory totals cover 140 Texas counties, and Falls County is not among them: no year's figure and no ten-year laboratory total names 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%.
Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: McLennan County reported the largest share at or above 4 pCi/L, 17.1%, and Bell County the smallest, 14.3%. Farther out, Brazos County (56 miles away) at 0.0%, Williamson County (57 miles away) at 2.0% and Travis County (81 miles away) at 9.3% have figures too. 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 Falls 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.
Falls County, Geology
The ground under Falls County
PredictedMost of the ground under Falls County is one class on USGS's geologic map: 99.6% of its land is low radon potential, with 0.4% moderate. 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 | 99.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Falls County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Falls County's is. Of the 5 counties that border it, 2 have more moderate-potential ground, McLennan County the most at 28.0%.
The map rates the ground, not the air in any home.
Local help
Falls County, Local resources
Radon testing and mitigation in Falls 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
Falls County, Questions
Questions about radon in Falls County
Are radon levels high in Falls County?
No CDC testing statistics are published here for Falls County, Texas yet. Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: McLennan County reported the largest share at or above 4 pCi/L, 17.1%, and Bell County the smallest, 14.3%.
Which counties border Falls County?
Falls County borders 5 counties: McLennan County, Limestone County, Robertson County, Milam County and Bell County.
Products
Falls County, Products
Testing a home in Falls County
No CDC figure names Falls County; the nearest county with one, McLennan County (26 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 Falls 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
MonitorAEGTEST
HOUND-1011 rechargeable radon detector with a 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
Falls County, Bordering counties
Counties bordering Falls 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 Bell CountyEPA zone 3
14.3%at or above 4 pCi/L
Median 1.1 pCi/L · 35 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 Robertson CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 7 tests
- Radon levels in Milam CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Falls County, Cities and towns
Cities and towns in Falls County
Falls County is growing: the Census Bureau puts it at 17,869 residents on July 1, 2025, up 5.5% from 16,942 in 2020. That works out to 23 people per square mile of land. Its largest town, Marlin, has 5,599 residents, 31.3% of the total. CDC publishes no radon test count for Falls County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
From Marlin to Lott, CDC publishes no figure by town: each reads Falls County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Marlin | 5,599 | +3.0% | 31.3% |
| Bruceville-Eddyextends beyond Falls County | 1,483 | +3.2% | Counted whole |
| Rosebud | 1,344 | +3.5% | 7.5% |
| Golindaextends beyond Falls County | 704 | +13.7% | Counted whole |
| Lott | 686 | +6.9% | 3.8% |
5 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 Falls County is counted whole, so it has no share.
Falls County, Homes
Homes in Falls County
Falls County is a place of houses on their own lots: 79% of its 7,449 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1975 (1990 for Texas), and 31% date from before 1960. 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 | Falls County | Texas |
|---|---|---|
| Housing units | 7,449 | 11,890,808 |
| Detached houses | 79% | 65% |
| In buildings of 5 or more | 4% | 21% |
| Mobile homes | 12% | 7% |
| Built before 1960 | 31% | 13% |
| Built since 2000 | 18% | 37% |
| Middle year built | 1975 | 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.