Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in DeWitt County, Texas
EPA puts DeWitt 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
6.6%
Bexar County, 75 miles
- Bexar
- 6.6%
- Texas
- 10.4%
Share at 4+ pCi/L, 197 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- DeWitt
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- DeWitt
- 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 DeWitt 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
DeWitt County, At a glance
DeWitt 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 DeWitt County, 2008 to 2017, laboratory
CDC holds 1 reported test for DeWitt County over the 2008 to 2017 laboratory totals, a result of 0.2 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). DeWitt County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for DeWitt 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).
DeWitt County, Compared
DeWitt County radon figures, compared
Calculated by Radon411CDC's largest figure for DeWitt 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 2.3 pCi/L, with a middle value of 1.3 pCi/L.
The nearest counties with a figure are Bexar County (75 miles away) at 6.6%, Travis County (90 miles away) at 9.3% and Nueces County (95 miles away) at 0.0%. 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 DeWitt 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.
DeWitt County, Geology
The ground under DeWitt County
PredictedUSGS's geologic map puts all of DeWitt 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.
DeWitt County beside the ground around it
Across Texas 0.5% of the land is rated high; none of DeWitt 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
DeWitt County, Local resources
Radon testing and mitigation in DeWitt 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
DeWitt County, Questions
Questions about radon in DeWitt County
Are radon levels high in DeWitt County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for DeWitt County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.2 pCi/L. Of the 8 nearest counties with a figure, within 130 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 9.3%.
Which counties border DeWitt County?
DeWitt County borders 5 counties: Gonzales County, Goliad County, Victoria County, Karnes County and Lavaca County.
Products
DeWitt County, Products
Testing a home in DeWitt County
No CDC figure names DeWitt County; the nearest county with one, Bexar County (75 miles away), reported 6.6% 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 DeWitt 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
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
DeWitt County, Bordering counties
Counties bordering DeWitt County
Calculated by Radon411- Radon levels in Gonzales CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 6 tests
- Radon levels in Goliad CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 6 tests
- Radon levels in Victoria CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 5 tests
- Radon levels in Lavaca CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 3 tests
- Radon levels in Karnes CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
DeWitt County, Cities and towns
Cities and towns in DeWitt County
The Census Bureau estimates 20,309 residents in DeWitt County for July 1, 2025, 468 more than in 2020 (+2.4%). That works out to 22 people per square mile of land. Its largest town, Cuero, has 8,264 residents, 40.7% of the total. CDC's 2 reported tests for 2007 to 2016 work out to 0.1 per 1,000 residents (2025 estimate), close to Texas' 0.1.
From Cuero to Nordheim, CDC publishes no figure by town: each reads DeWitt County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cuero | 8,264 | +1.1% | 40.7% |
| Yoakumextends beyond DeWitt County | 5,900 | −0.3% | Counted whole |
| Yorktown | 1,780 | −2.7% | 8.8% |
| Nordheim | 346 | +5.5% | 1.7% |
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). A place that extends beyond DeWitt County is counted whole, so it has no share.
DeWitt County, Homes
Homes in DeWitt County
DeWitt County is a place of houses on their own lots: 77% of its 9,222 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 33% date from before 1960. 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 | DeWitt County | Texas |
|---|---|---|
| Housing units | 9,222 | 11,890,808 |
| Detached houses | 77% | 65% |
| In buildings of 5 or more | 3% | 21% |
| Mobile homes | 17% | 7% |
| Built before 1960 | 33% | 13% |
| Built since 2000 | 22% | 37% |
| Middle year built | 1975 | 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.