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 Cass County, Texas
EPA puts Cass County in Zone 3, its lowest radon zone, and only 1 radon test from it is 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
Nearest county
9.1%
Smith County, 72 miles
- Smith
- 9.1%
- Texas
- 10.4%
Share at 4+ pCi/L, 33 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Cass
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Cass
- 1
- 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 Cass 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
Cass County, At a glance
Cass 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 Cass County, 2008 to 2017, laboratory
CDC holds 1 reported test for Cass County over the 2008 to 2017 laboratory totals, a result of 1.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Cass County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Cass 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).
Cass County, Compared
Cass County radon figures, compared
Calculated by Radon411CDC's largest figure for Cass County rests on 1 test over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 1.6 pCi/L, with a middle value of 1.6 pCi/L.
The nearest counties with a figure are Smith County (72 miles away) at 9.1%, Collin County (129 miles away) at 7.7% and Dallas County (143 miles away) at 8.7%. 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 Cass 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.
Cass County, Geology
The ground under Cass County
PredictedUSGS's geologic map puts all of Cass 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 | 99.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cass County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Cass County's is. None of the 5 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Cass County, Local resources
Radon testing and mitigation in Cass 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
Cass County, Questions
Questions about radon in Cass County
Are radon levels high in Cass County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Cass County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Of the 8 nearest counties with a figure, within 203 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 17.1%.
Which counties border Cass County?
Cass County borders 5 counties: Bowie County, TX, Morris County, TX, Marion County, TX, Miller County, AR and Caddo Parish, LA.
Products
Cass County, Products
Testing a home in Cass County
No CDC figure names Cass County; the nearest county with one, Smith County (72 miles away), reported 9.1% 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 Cass 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
Cass County, Bordering counties
Counties bordering Cass County
Calculated by Radon411- Radon levels in Miller County, AREPA zone 3
100.0%at or above 4 pCi/L
Median 4.8 pCi/L · 1 test
- Radon levels in Caddo Parish, LAEPA zone 3
16.7%at or above 4 pCi/L
Median 1.2 pCi/L · 24 tests
- Radon levels in Morris County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 3 tests
- Radon levels in Bowie County, TXEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Marion County, TXEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Cass County, Cities and towns
Cities and towns in Cass County
The Census Bureau estimates 28,651 residents in Cass County for July 1, 2025, 210 more than in 2020 (+0.7%). That works out to 31 people per square mile of land. No town dominates: Atlanta, the largest, has 5,478 residents, 19.1% of the total. Reported testing is thin here: 1 test over 2008 to 2017, or under 0.1 for every 1,000 residents (2025 estimate), where Texas as a whole comes to 0.1.
From Atlanta to Domino, CDC publishes no figure by town: each reads Cass County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Atlanta | 5,478 | +0.8% | 19.1% |
| Linden | 1,809 | −0.7% | 6.3% |
| Hughes Springsextends beyond Cass County | 1,531 | −3.6% | Counted whole |
| Queen City | 1,393 | −0.9% | 4.9% |
| Avinger | 379 | +0.3% | 1.3% |
| Bloomburg | 328 | +3.1% | 1.1% |
| Douglassville | 214 | +0.9% | 0.7% |
| Marietta | 115 | Level | 0.4% |
| Domino | 83 | +12.2% | 0.3% |
9 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 Cass County is counted whole, so it has no share.
Cass County, Homes
Homes in Cass County
Of Cass County's 13,963 homes, 72% are detached houses, against 65% across Texas; 19% are mobile homes. The homes are older than Texas' as a whole: half were built before 1980 (1990 for Texas), and 18% date from before 1960. Owners live in 77% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.
| Homes | Cass County | Texas |
|---|---|---|
| Housing units | 13,963 | 11,890,808 |
| Detached houses | 72% | 65% |
| In buildings of 5 or more | 2% | 21% |
| Mobile homes | 19% | 7% |
| Built before 1960 | 18% | 13% |
| Built since 2000 | 21% | 37% |
| Middle year built | 1980 | 1990 |
| Owner-occupied | 77% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.