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 Cooke County, Texas
EPA puts Cooke 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
Highest bordering
7.2%
Denton County
- Denton
- 7.2%
1 of 5 neighbours have 30+ tests, 2007 to 2016
Nearest county
7.2%
Denton County, 30 miles
- Denton
- 7.2%
- Texas
- 10.4%
Share at 4+ pCi/L, 181 tests, 2007 to 2016
Ground above low
24.4%
2.9 pts below Texas
- Cooke
- 24.4%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Cooke
- 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 Cooke 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
Cooke County, At a glance
Cooke County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 76% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Cooke County, 2008 to 2017, laboratory
CDC holds 1 reported test for Cooke 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). Cooke County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Cooke 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. Measured data period: 2008 to 2017.
Cooke County, Compared
Cooke County radon figures, compared
Calculated by Radon411CDC's largest figure for Cooke 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.
Denton County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 7.2% of its tests at or above 4 pCi/L. Farther out, Collin County (48 miles away) at 7.7%, Tarrant County (60 miles away) at 10.6% and Dallas County (65 miles away) at 8.7% 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 Cooke County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 76% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Cooke County, Geology
The ground under Cooke County
PredictedMost of the ground under Cooke County is one class on USGS's geologic map: 75.6% of its land is low radon potential, with 24.4% moderate. The map puts 75.1% of Cooke County in the area it calls Central Texas/Gulf Coast Plain and 24.4% in Cretaceous Gulfian series. USGS gives the first a radon index of 7, in the low band (5 to 8), and the second 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Texas/Gulf Coast Plain | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 75.1% |
| Cretaceous Gulfian series | Cretaceous sandstone, shale, limestone, siltstone. | Moderate | 10 | 24.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cooke County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Cooke County's is. Of the 5 counties that border it, 2 have more moderate-potential ground, Grayson County the most at 85.4%.
The map rates the ground, not the air in any home.
Local help
Cooke County, Local resources
Radon testing and mitigation in Cooke 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
Cooke County, Questions
Questions about radon in Cooke County
Are radon levels high in Cooke County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Cooke County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Denton County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 7.2% of its tests at or above 4 pCi/L.
Which counties border Cooke County?
Cooke County borders 5 counties: Denton County, TX, Love County, OK, Montague County, TX, Wise County, TX and Grayson County, TX.
Products
Cooke County, Products
Testing a home in Cooke County
No CDC figure names Cooke County; the nearest county with one, Denton County (30 miles away), reported 7.2% 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 Cooke 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
MonitorAEGTEST
HOUND-1011S rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Cooke County, Bordering counties
Counties bordering Cooke County
Calculated by Radon411- Radon levels in Montague County, TXEPA zone 3
12.5%at or above 4 pCi/L
Median 0.1 pCi/L · 16 tests
- Radon levels in Denton County, TXEPA zone 3
7.2%at or above 4 pCi/L
Median 0.9 pCi/L · 181 tests
- Radon levels in Grayson County, TXEPA zone 3
5.0%at or above 4 pCi/L
Median 1.1 pCi/L · 20 tests
- Radon levels in Wise County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 4 tests
- Radon levels in Love County, OKEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Cooke County, Cities and towns
Cities and towns in Cooke County
Cooke County is growing: the Census Bureau puts it at 44,461 residents on July 1, 2025, up 6.5% from 41,751 in 2020. That works out to 51 people per square mile of land. Its largest town, Gainesville, has 18,528 residents, 41.7% 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 Gainesville to Oak Ridge, CDC publishes no figure by town: each reads Cooke County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Gainesville | 18,528 | +6.5% | 41.7% |
| Sangerextends beyond Cooke County | 10,238 | +14.6% | Counted whole |
| Pilot Pointextends beyond Cooke County | 8,052 | +82.2% | Counted whole |
| Muenster | 1,742 | +13.0% | 3.9% |
| Lindsay | 1,261 | +20.4% | 2.8% |
| Valley View | 887 | +19.1% | 2.0% |
| Road Runner | 863 | +12.2% | 1.9% |
| Callisburg | 375 | +19.0% | 0.8% |
| Oak Ridge | 312 | +24.8% | 0.7% |
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 Cooke County is counted whole, so it has no share.
Cooke County, Homes
Homes in Cooke County
Cooke County is a place of houses on their own lots: 76% of its 17,841 homes are detached single-family houses, against 65% across Texas. Half of its homes were built before 1984, close to Texas' 1990: 20% date from before 1960 and 31% from 2000 or later. 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 | Cooke County | Texas |
|---|---|---|
| Housing units | 17,841 | 11,890,808 |
| Detached houses | 76% | 65% |
| In buildings of 5 or more | 6% | 21% |
| Mobile homes | 12% | 7% |
| Built before 1960 | 20% | 13% |
| Built since 2000 | 31% | 37% |
| Middle year built | 1984 | 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.