Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Fannin County, Texas
EPA puts Fannin 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
7.7%
Collin County
- Collin
- 7.7%
1 of 6 neighbours have 30+ tests, 2007 to 2016
Nearest county
7.7%
Collin County, 39 miles
- Collin
- 7.7%
- Texas
- 10.4%
Share at 4+ pCi/L, 284 tests, 2007 to 2016
Ground above low
82.5%
55.2 pts above Texas
- Fannin
- 82.5%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Fannin
- 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 Fannin 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
Fannin County, At a glance
Fannin County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Moderate across 82% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Fannin County, 2008 to 2017, laboratory
CDC holds 1 reported test for Fannin County over the 2008 to 2017 laboratory totals, a result of 0.9 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Fannin County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Fannin 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).
Fannin County, Compared
Fannin County radon figures, compared
Calculated by Radon411CDC's largest figure for Fannin 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 0.9 pCi/L, with a middle value of 0.9 pCi/L.
Collin County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 7.7% of its tests at or above 4 pCi/L. Farther out, Denton County (64 miles away) at 7.2%, Dallas County (69 miles away) at 8.7% and Tarrant County (89 miles away) at 10.6% 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 Fannin County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 82% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Fannin County, Geology
The ground under Fannin County
PredictedMost of the ground under Fannin County is one class on USGS's geologic map: 82.5% of its land is moderate radon potential, with 17.5% low. The map puts 82.5% of Fannin County in the area it calls Cretaceous Gulfian series and 17.5% in East Texas Province. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 6, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Cretaceous Gulfian series | Cretaceous sandstone, shale, limestone, siltstone. | Moderate | 10 | 82.5% |
| East Texas Province | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 6 | 17.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Fannin County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Fannin County's is. Of the 6 counties that border it, 1 has more moderate-potential ground, Grayson County the most at 85.4%.
The map rates the ground, not the air in any home.
Local help
Fannin County, Local resources
Radon testing and mitigation in Fannin 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
Fannin County, Questions
Questions about radon in Fannin County
Are radon levels high in Fannin County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Fannin County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Collin County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 7.7% of its tests at or above 4 pCi/L.
Which counties border Fannin County?
Fannin County borders 6 counties: Bryan County, OK, Delta County, TX, Grayson County, TX, Lamar County, TX, Hunt County, TX and Collin County, TX.
Products
Fannin County, Products
Testing a home in Fannin County
No CDC figure names Fannin County; the nearest county with one, Collin County (39 miles away), reported 7.7% 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 Fannin 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-1085 palm-sized rechargeable radon detector
- 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
Fannin County, Bordering counties
Counties bordering Fannin County
Calculated by Radon411- Radon levels in Hunt County, TXEPA zone 3
25.0%at or above 4 pCi/L
Median 2.0 pCi/L · 4 tests
- Radon levels in Collin County, TXEPA zone 3
7.7%at or above 4 pCi/L
Median 1.0 pCi/L · 284 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 Bryan County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 1 test
- Radon levels in Lamar County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 0.3 pCi/L · 6 tests
- Radon levels in Delta County, TXEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Fannin County, Cities and towns
Cities and towns in Fannin County
Fannin County is growing: the Census Bureau puts it at 39,265 residents on July 1, 2025, up 9.1% from 35,974 in 2020. That works out to 44 people per square mile of land. Its largest town, Bonham, has 11,263 residents, 28.7% 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 Bonham to Pecan Gap, CDC publishes no figure by town: each reads Fannin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Bonham | 11,263 | +8.7% | 28.7% |
| Leonard | 2,212 | +8.2% | 5.6% |
| Honey Grove | 1,806 | +5.1% | 4.6% |
| Whitewrightextends beyond Fannin County | 1,749 | +1.0% | Counted whole |
| Trentonextends beyond Fannin County | 894 | +23.5% | Counted whole |
| Savoy | 836 | +3.6% | 2.1% |
| Ector | 817 | +10.6% | 2.1% |
| Ladonia | 635 | +5.7% | 1.6% |
| Dodd City | 410 | +10.2% | 1.0% |
| Bailey | 241 | +8.6% | 0.6% |
| Windom | 205 | +6.2% | 0.5% |
| Ravenna | 196 | +12.6% | 0.5% |
- Pecan Gap (part)
13 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Fannin County is counted whole, so it has no share.
Fannin County, Homes
Homes in Fannin County
Fannin County is a place of houses on their own lots: 78% of its 14,743 homes are detached single-family houses, against 65% across Texas. Half of its homes were built before 1987, close to Texas' 1990: 20% date from before 1960 and 31% from 2000 or later. Owners live in 75% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.
| Homes | Fannin County | Texas |
|---|---|---|
| Housing units | 14,743 | 11,890,808 |
| Detached houses | 78% | 65% |
| In buildings of 5 or more | 4% | 21% |
| Mobile homes | 13% | 7% |
| Built before 1960 | 20% | 13% |
| Built since 2000 | 31% | 37% |
| Middle year built | 1987 | 1990 |
| Owner-occupied | 75% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.