Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Parker County, Texas
EPA puts Parker County in Zone 3, its lowest radon zone, and only 18 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
10.6%
Tarrant County
- Tarrant
- 10.6%
1 of 6 neighbours have 30+ tests, 2007 to 2016
Nearest county
10.6%
Tarrant County, 30 miles
- Tarrant
- 10.6%
- Texas
- 10.4%
Share at 4+ pCi/L, 312 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Parker
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
20
Too few for a share
- Parker
- 20
- Needed
- 30
2007 to 2016, 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 Parker 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
Parker County, At a glance
Parker 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 Parker County, 2008 to 2017, laboratory
CDC holds 18 reported tests for Parker County over the 2008 to 2017 laboratory totals, with a median of 1.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Parker County beside the counties around it is how this page reads it.
What these figures count
Only 18 tests were reported to CDC for Parker 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).
Parker County, Compared
Parker County radon figures, compared
Calculated by Radon411CDC's largest figure for Parker County rests on 20 tests over the 2007 to 2016 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 5.0 points and no rank or comparison is drawn from it. Results reached as high as 13.4 pCi/L, with a middle value of 1.0 pCi/L.
Tarrant County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 10.6% of its tests at or above 4 pCi/L. Farther out, Denton County (50 miles away) at 7.2%, Dallas County (60 miles away) at 8.7% and Collin County (77 miles away) at 7.7% 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 Parker 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.
Parker County, Geology
The ground under Parker County
PredictedUSGS's geologic map puts all of Parker County's mapped land in one class: low radon potential. The map puts 93.8% of Parker County in the area it calls Central Texas/Gulf Coast Plain and 6.2% in Central Texas. USGS gives both 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/Gulf Coast Plain | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 93.8% |
| Central Texas | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 6.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Parker County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Parker County's is. Of the 6 counties that border it, 2 have more moderate-potential ground, Johnson County the most at 54.0%.
The map rates the ground, not the air in any home.
Local help
Parker County, Local resources
Radon testing and mitigation in Parker 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
Parker County, Questions
Questions about radon in Parker County
Are radon levels high in Parker County?
Over the 2008 to 2017 laboratory totals, 11.1% of the radon tests reported to CDC for Parker County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.1 pCi/L. Tarrant County, the one bordering county with a figure over the 2007 to 2016 laboratory totals, reported 10.6% of its tests at or above 4 pCi/L.
Which counties border Parker County?
Parker County borders 6 counties: Hood County, Tarrant County, Palo Pinto County, Johnson County, Jack County and Wise County.
Products
Parker County, Products
Testing a home in Parker County
No CDC figure names Parker County; the nearest county with one, Tarrant County (30 miles away), reported 10.6% 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 Parker 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
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Parker County, Bordering counties
Counties bordering Parker County
Calculated by Radon411- Radon levels in Tarrant CountyEPA zone 3
10.6%at or above 4 pCi/L
Median 0.9 pCi/L · 312 tests
- Radon levels in Hood CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 5 tests
- Radon levels in Johnson CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 14 tests
- Radon levels in Wise CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 4 tests
- Radon levels in Palo Pinto CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
- Radon levels in Jack CountyEPA zone 3
No CDC figure for 2007 to 2016; its page reads it against its own neighbours.
Parker County, Cities and towns
Cities and towns in Parker County
Parker County is growing: the Census Bureau puts it at 184,767 residents on July 1, 2025, up 23.5% from 149,559 in 2020. That works out to 204 people per square mile of land. Fort Worth, the largest place on its list (1,028,117 residents in all), extends beyond Parker County, so no share of the total is worked out for it. CDC's 20 reported tests for 2007 to 2016 work out to 0.1 per 1,000 residents (2025 estimate), close to Texas' 0.1.
From Fort Worth to Cool, CDC publishes no figure by town: each reads Parker County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Fort Worthextends beyond Parker County | 1,028,117 | +11.3% | Counted whole |
| Weatherford | 40,634 | +30.4% | 22.0% |
| Mineral Wellsextends beyond Parker County | 15,983 | +7.8% | Counted whole |
| Azleextends beyond Parker County | 15,365 | +14.5% | Counted whole |
| Willow Park | 7,439 | +38.0% | 4.0% |
| Aledo | 7,122 | +44.2% | 3.9% |
| Springtownextends beyond Parker County | 5,204 | +68.4% | Counted whole |
| Renoextends beyond Parker County | 3,823 | +30.8% | Counted whole |
| Annetta | 3,546 | +15.5% | 1.9% |
| Hudson Oaks | 2,800 | +15.9% | 1.5% |
| Cressonextends beyond Parker County | 2,126 | +47.5% | Counted whole |
| Annetta South | 701 | +15.1% | 0.4% |
- Annetta North
- Millsap
- Sanctuary
- Cool
16 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 Parker County is counted whole, so it has no share.
Parker County, Homes
Homes in Parker County
Of Parker County's 58,786 homes, 75% are detached houses, against 65% across Texas; 15% are mobile homes. Much of Parker County is recent building: 52% of its homes have gone up since 2000 and the middle year built is 2001, against 1990 for Texas. Owners live in 82% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.
| Homes | Parker County | Texas |
|---|---|---|
| Housing units | 58,786 | 11,890,808 |
| Detached houses | 75% | 65% |
| In buildings of 5 or more | 4% | 21% |
| Mobile homes | 15% | 7% |
| Built before 1960 | 7% | 13% |
| Built since 2000 | 52% | 37% |
| Middle year built | 2001 | 1990 |
| Owner-occupied | 82% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.