Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Willacy County, Texas
EPA puts Willacy 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
Nearest county
0.0%
Nueces County, 87 miles
- Nueces
- 0.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 45 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Willacy
- 0.0%
- 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 Willacy 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
Willacy County, At a glance
Willacy County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 93% 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 Willacy County. Nueces County, 87 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Willacy County, Compared
Willacy County radon figures, compared
Calculated by Radon411No CDC figure names Willacy County, in any year or ten-year total; over the 2007 to 2016 laboratory totals, the agency's counts reach 140 Texas counties without 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%.
The nearest counties with a figure are Nueces County (87 miles away) at 0.0%, Bexar County (212 miles away) at 6.6% and Brazoria County (231 miles away) at 6.3%. 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 Willacy County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 93% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Willacy County, Geology
The ground under Willacy County
PredictedUSGS's geologic map puts all of Willacy County's mapped land in one class: low radon potential. 92.8% of it lies in the area the map calls South Texas 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 |
|---|---|---|---|---|
| South Texas Plain | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 92.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Willacy County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Willacy County's is. None of the 3 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Willacy County, Local resources
Radon testing and mitigation in Willacy 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
Willacy County, Questions
Questions about radon in Willacy County
Are radon levels high in Willacy County?
No CDC testing statistics are published here for Willacy County, Texas yet. Of the 8 nearest counties with a figure, within 288 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 9.3%.
Which counties border Willacy County?
Willacy County borders 3 counties: Cameron County, Kenedy County and Hidalgo County.
Products
Willacy County, Products
Testing a home in Willacy County
No CDC figure names Willacy County; the nearest county with one, Nueces County (87 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 Willacy 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
EcoQube Flex battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 15 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Willacy County, Bordering counties
Counties bordering Willacy County
Calculated by Radon411- Radon levels in Cameron CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 27 tests
- Radon levels in Hidalgo CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 15 tests
- Radon levels in Kenedy CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Willacy County, Cities and towns
Cities and towns in Willacy County
About 19,971 people live in Willacy County by the Census Bureau's estimate for July 1, 2025, 154 fewer than in 2020 (−0.8%). That works out to 34 people per square mile of land. Raymondville alone is home to 10,082 of them, 50.5% of the total. Together its 3 incorporated places hold 64.3% of those residents; the other 35.7% live outside any of them. CDC publishes no radon test count for Willacy County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
From Raymondville to San Perlita, CDC publishes no figure by town: each reads Willacy County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Raymondville | 10,082 | −1.1% | 50.5% |
| Lyford | 2,210 | −2.7% | 11.1% |
| San Perlita | 545 | +0.9% | 2.7% |
3 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).
Willacy County, Homes
Homes in Willacy County
Willacy County is a place of houses on their own lots: 77% of its 6,854 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1981 (1990 for Texas), and 20% date from before 1960. 72% 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 | Willacy County | Texas |
|---|---|---|
| Housing units | 6,854 | 11,890,808 |
| Detached houses | 77% | 65% |
| In buildings of 5 or more | 3% | 21% |
| Mobile homes | 12% | 7% |
| Built before 1960 | 20% | 13% |
| Built since 2000 | 26% | 37% |
| Middle year built | 1981 | 1990 |
| Owner-occupied | 72% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.