Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in King County, Texas
EPA puts King 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, 90 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
- King
- 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 King 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
King County, At a glance
King 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 King County. Lubbock County, 90 miles away, is the nearest county with a figure over the 2007 to 2016 laboratory totals.
King County, Compared
King County radon figures, compared
Calculated by Radon411No CDC figure names King 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 (90 miles away) at 57.8%, Randall County (132 miles away) at 71.4% and Potter County (154 miles away) at 20.0%. 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 King 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.
King County, Geology
The ground under King County
PredictedUSGS's geologic map puts all of King 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.
King County beside the ground around it
Across Texas 0.5% of the land is rated high; none of King County's is. Of the 8 counties that border it, 3 have more moderate-potential ground, Kent County the most at 58.1%.
The map rates the ground, not the air in any home.
Local help
King County, Local resources
Radon testing and mitigation in King 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
King County, Questions
Questions about radon in King County
Are radon levels high in King County?
No CDC testing statistics are published here for King County, Texas yet. Of the 8 nearest counties with a figure, within 215 miles, the share of tests at or above 4 pCi/L runs from 1.0% to 71.4%.
Which counties border King County?
King County borders 8 counties: Cottle County, Stonewall County, Dickens County, Knox County, Foard County, Kent County, Haskell County and Motley County.
Products
King County, Products
Testing a home in King County
No CDC figure names King County; the nearest county with one, Lubbock County (90 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 King 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-3699 radon monitor with a 2.1-inch touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
First reading: Within 1 hour
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
King County, Bordering counties
Counties bordering King County
Calculated by Radon411counties bordering King County: 1 of 8
King County, Residents
Who lives in King County
King County has been losing residents: from 267 in 2020 to 192 on July 1, 2025, a fall of 28.1% by the Census Bureau's estimates. Spread over its land, that is 0.2 people to the square mile. CDC publishes no radon test count for King County; across Texas its counts for 2007 to 2016 come to 0.1 tests for every 1,000 residents (2025 estimate).
Census lists no incorporated place in King County: every home in it reads the county's figures.
Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
King County, Homes
Homes in King County
Of King County's 148 homes, 61% are detached houses, against 65% across Texas; 28% are mobile homes. The homes are older than Texas' as a whole: half were built before 1979 (1990 for Texas), and 24% date from before 1960. Most occupied homes here are rented: owners live in 42% (Texas: 63%). A tenant can run a test; a fix is the landlord's to make.
| Homes | King County | Texas |
|---|---|---|
| Housing units | 148 | 11,890,808 |
| Detached houses | 61% | 65% |
| In buildings of 5 or more | 0% | 21% |
| Mobile homes | 28% | 7% |
| Built before 1960 | 24% | 13% |
| Built since 2000 | 38% | 37% |
| Middle year built | 1979 | 1990 |
| Owner-occupied | 42% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.