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 Jefferson County, Texas
EPA puts Jefferson County in Zone 3, its lowest radon zone, and only 23 radon tests from it are 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
0.0%
Galveston County, 59 miles
- Galveston
- 0.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 83 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Jefferson
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
23
Too few for a share
- Jefferson
- 23
- 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 Jefferson 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
Jefferson County, At a glance
Jefferson 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 Jefferson County, 2008 to 2017, laboratory
CDC holds 23 reported tests for Jefferson County over the 2008 to 2017 laboratory totals, with a median of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Jefferson County beside the counties around it is how this page reads it.
What these figures count
Only 23 tests were reported to CDC for Jefferson 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).
Jefferson County, Compared
Jefferson County radon figures, compared
Calculated by Radon411CDC's largest figure for Jefferson County rests on 23 tests over the 2008 to 2017 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 4.3 points and no rank or comparison is drawn from it. Results reached as high as 25.0 pCi/L, with a middle value of 0.1 pCi/L.
The nearest counties with a figure are Galveston County (59 miles away) at 0.0%, Harris County (74 miles away) at 3.1% and Montgomery County (85 miles away) at 7.1%. 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 Jefferson 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.
Jefferson County, Geology
The ground under Jefferson County
PredictedUSGS's geologic map puts all of Jefferson County's mapped land in one class: low radon potential. The map puts 80.0% of Jefferson County in the area it calls Coastal Plain and 20.0% in Delta. USGS gives the first a radon index of 7 and the second 6, both 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 | 80.0% |
| Delta | Alluvium and marsh. | Low | 6 | 20.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Jefferson County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Jefferson 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
Jefferson County, Local resources
Radon testing and mitigation in Jefferson 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
Jefferson County, Questions
Questions about radon in Jefferson County
Are radon levels high in Jefferson County?
Over the 2008 to 2017 laboratory totals, 4.3% of the radon tests reported to CDC for Jefferson County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the 8 nearest counties with a figure, within 212 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 9.1%.
Which counties border Jefferson County?
Jefferson County borders 5 counties: Orange County, TX, Chambers County, TX, Hardin County, TX, Cameron Parish, LA and Liberty County, TX.
Products
Jefferson County, Products
Testing a home in Jefferson County
No CDC figure names Jefferson County; the nearest county with one, Galveston County (59 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 Jefferson 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
Jefferson County, Bordering counties
Counties bordering Jefferson County
Calculated by Radon411- Radon levels in Orange County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 11 tests
- Radon levels in Chambers County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 3 tests
- Radon levels in Hardin County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 7 tests
- Radon levels in Cameron Parish, LAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Liberty County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 1 test
Jefferson County, Cities and towns
Cities and towns in Jefferson County
About 254,321 people live in Jefferson County by the Census Bureau's estimate for July 1, 2025, 1,820 fewer than in 2020 (−0.7%). That works out to 290 people per square mile of land. Its largest town, Beaumont, has 112,967 residents, 44.4% of the total. Reported testing is thin here: 23 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Texas as a whole comes to 0.1.
From Beaumont to Taylor Landing, CDC publishes no figure by town: each reads Jefferson County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Beaumont | 112,967 | −1.6% | 44.4% |
| Port Arthurextends beyond Jefferson County | 55,804 | −0.4% | Counted whole |
| Nederland | 18,108 | −3.6% | 7.1% |
| Groves | 16,907 | −2.2% | 6.6% |
| Port Neches | 13,768 | +0.6% | 5.4% |
| China | 1,343 | +0.8% | 0.5% |
| Bevil Oaks | 1,042 | −4.1% | 0.4% |
| Nome | 472 | −0.4% | 0.2% |
| Taylor Landing | 285 | +2.5% | 0.1% |
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 Jefferson County is counted whole, so it has no share.
Jefferson County, Homes
Homes in Jefferson County
Of Jefferson County's 109,351 homes, 71% are detached houses, against 65% across Texas; 17% are in buildings of five or more homes. The homes are older than Texas' as a whole: half were built before 1976 (1990 for Texas), and 19% date from before 1960. 62% 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 | Jefferson County | Texas |
|---|---|---|
| Housing units | 109,351 | 11,890,808 |
| Detached houses | 71% | 65% |
| In buildings of 5 or more | 17% | 21% |
| Mobile homes | 4% | 7% |
| Built before 1960 | 19% | 13% |
| Built since 2000 | 23% | 37% |
| Middle year built | 1976 | 1990 |
| Owner-occupied | 62% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.