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 Gregg County, Texas
EPA puts Gregg County in Zone 3, its lowest radon zone, and only 13 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
Highest bordering
9.1%
Smith County
- Smith
- 9.1%
1 of 4 neighbours have 30+ tests, 2007 to 2016
Nearest county
9.1%
Smith County, 27 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
- Gregg
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
14
Too few for a share
- Gregg
- 14
- Needed
- 30
2006 to 2015, 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 Gregg 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
Gregg County, At a glance
Gregg 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 Gregg County, 2008 to 2017, laboratory
CDC holds 13 reported tests for Gregg County over the 2008 to 2017 laboratory totals, with a median of 0.9 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Gregg County beside the counties around it is how this page reads it.
What these figures count
Only 13 tests were reported to CDC for Gregg 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).
Gregg County, Compared
Gregg County radon figures, compared
Calculated by Radon411CDC's largest figure for Gregg County rests on 14 tests over the 2006 to 2015 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 7.1 points and no rank or comparison is drawn from it. Results reached as high as 3.1 pCi/L, with a middle value of 0.9 pCi/L.
Smith County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 9.1% of its tests at or above 4 pCi/L. Farther out, Collin County (113 miles away) at 7.7%, Dallas County (116 miles away) at 8.7% and Denton County (143 miles away) at 7.2% have figures too. 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 Gregg 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.
Gregg County, Geology
The ground under Gregg County
PredictedUSGS's geologic map puts all of Gregg 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Gregg County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Gregg County's is. None of the 4 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Gregg County, Local resources
Radon testing and mitigation in Gregg 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
Gregg County, Questions
Questions about radon in Gregg County
Are radon levels high in Gregg County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Gregg County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Smith County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 9.1% of its tests at or above 4 pCi/L.
Which counties border Gregg County?
Gregg County borders 4 counties: Upshur County, Smith County, Rusk County and Harrison County.
Products
Gregg County, Products
Testing a home in Gregg County
No CDC figure names Gregg County; the nearest county with one, Smith County (27 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 Gregg 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
Gregg County, Bordering counties
Counties bordering Gregg County
Calculated by Radon411- Radon levels in Smith CountyEPA zone 3
9.1%at or above 4 pCi/L
Median 0.8 pCi/L · 33 tests
- Radon levels in Upshur CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.6 pCi/L · 4 tests
- Radon levels in Rusk CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.4 pCi/L · 2 tests
- Radon levels in Harrison CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.2 pCi/L · 4 tests
Gregg County, Cities and towns
Cities and towns in Gregg County
The Census Bureau estimates 126,095 residents in Gregg County for July 1, 2025, 1,780 more than in 2020 (+1.4%). That works out to 461 people per square mile of land. Longview, the largest place on its list (83,236 residents in all), extends beyond Gregg County, so no share of the total is worked out for it. CDC's 14 reported tests for 2006 to 2015 work out to 0.1 per 1,000 residents (2025 estimate), close to Texas' 0.1.
From Longview to Warren City, CDC publishes no figure by town: each reads Gregg County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Longviewextends beyond Gregg County | 83,236 | +1.8% | Counted whole |
| Kilgoreextends beyond Gregg County | 13,531 | +1.4% | Counted whole |
| Gladewaterextends beyond Gregg County | 6,306 | +2.7% | Counted whole |
| White Oak | 6,186 | −0.4% | 4.9% |
| Lakeport | 993 | +2.0% | 0.8% |
| East Mountainextends beyond Gregg County | 972 | +7.4% | Counted whole |
| Clarksville Cityextends beyond Gregg County | 779 | +2.2% | Counted whole |
| Eastonextends beyond Gregg County | 507 | +3.0% | Counted whole |
| Warren Cityextends beyond Gregg County | 321 | Level | Counted whole |
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 Gregg County is counted whole, so it has no share.
Gregg County, Homes
Homes in Gregg County
Of Gregg County's 53,590 homes, 64% are detached houses, against 65% across Texas; 15% are in buildings of five or more homes. The homes are older than Texas' as a whole: half were built before 1980 (1990 for Texas), and 16% date from before 1960. 59% 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 | Gregg County | Texas |
|---|---|---|
| Housing units | 53,590 | 11,890,808 |
| Detached houses | 64% | 65% |
| In buildings of 5 or more | 15% | 21% |
| Mobile homes | 8% | 7% |
| Built before 1960 | 16% | 13% |
| Built since 2000 | 21% | 37% |
| Middle year built | 1980 | 1990 |
| Owner-occupied | 59% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.