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 Knox County, Texas
EPA puts Knox 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
57.8%
Lubbock County, 120 miles
- Lubbock
- 57.8%
- Texas
- 10.4%
Share at 4+ pCi/L, 128 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Knox
- 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 Knox 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
Knox County, At a glance
Knox 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
No CDC test figures here
CDC has published no radon test figures for Knox County. Lubbock County, 120 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
Knox County, Compared
Knox County radon figures, compared
Calculated by Radon411No CDC figure names Knox 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 Lubbock County (120 miles away) at 57.8%, Tarrant County (153 miles away) at 10.6% and Denton County (154 miles away) at 7.2%. 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 Knox 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.
Knox County, Geology
The ground under Knox County
PredictedUSGS's geologic map puts all of Knox County's mapped land in one class: low radon potential. All of it lies in the area the map calls Central Texas, 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 |
|---|---|---|---|---|
| Central Texas | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Knox County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Knox County's is. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Knox County, Local resources
Radon testing and mitigation in Knox 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
Knox County, Questions
Questions about radon in Knox County
Are radon levels high in Knox County?
No CDC testing statistics are published here for Knox County, Texas yet. Of the 8 nearest counties with a figure, within 185 miles, the share of tests at or above 4 pCi/L runs from 1.0% to 71.4%.
Which counties border Knox County?
Knox County borders 6 counties: Foard County, Haskell County, Baylor County, King County, Stonewall County and Throckmorton County.
Products
Knox County, Products
Testing a home in Knox County
No CDC figure names Knox County; the nearest county with one, Lubbock County (120 miles away), reported 57.8% 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 Knox 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
MonitorSafetySiren
Pro4 plug-in radon detector with a display and alarm
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 48 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Knox County, Bordering counties
Counties bordering Knox County
Calculated by Radon411counties bordering Knox County: 1 of 6
Knox County, Cities and towns
Cities and towns in Knox County
About 3,192 people live in Knox County by the Census Bureau's estimate for July 1, 2025, 154 fewer than in 2020 (−4.6%). Spread over its land, that is 3.8 people to the square mile. Its largest town, Munday, has 1,190 residents, 37.3% of the total. Together its 4 incorporated places hold 79.6% of those residents; the other 20.4% live outside any of them. CDC publishes no radon test count for Knox County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
From Munday to Goree, CDC publishes no figure by town: each reads Knox County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Munday | 1,190 | −4.6% | 37.3% |
| Knox City | 1,009 | −5.0% | 31.6% |
| Benjamin | 189 | −4.1% | 5.9% |
| Goree | 152 | −5.0% | 4.8% |
4 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).
Knox County, Homes
Homes in Knox County
Knox County is a place of houses on their own lots: 88% of its 1,802 homes are detached single-family houses, against 65% across Texas. The homes are older than Texas' as a whole: half were built before 1967 (1990 for Texas), and 38% date from before 1960. Owners live in 78% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.
| Homes | Knox County | Texas |
|---|---|---|
| Housing units | 1,802 | 11,890,808 |
| Detached houses | 88% | 65% |
| In buildings of 5 or more | 2% | 21% |
| Mobile homes | 4% | 7% |
| Built before 1960 | 38% | 13% |
| Built since 2000 | 5% | 37% |
| Middle year built | 1967 | 1990 |
| Owner-occupied | 78% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.