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 Chambers County, Texas
EPA puts Chambers County in Zone 3, its lowest radon zone, and only 3 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
3.1%
Harris County
- Harris
- 3.1%
- Galveston
- 0.0%
2 of 4 neighbours have 30+ tests, 2007 to 2016
Nearest county
0.0%
Galveston County, 32 miles
- Galveston
- 0.0%
- Texas
- 10.4%
Share at 4+ pCi/L, 83 tests, 2007 to 2016
Ground above low
None
27.3 pts below Texas
- Chambers
- 0.0%
- Texas
- 27.3%
Share of land USGS rates moderate or high potential
Tests reported
3
Too few for a share
- Chambers
- 3
- 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 Chambers 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
Chambers County, At a glance
Chambers County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 98% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Chambers County, 2008 to 2017, laboratory
CDC holds 3 reported tests for Chambers County over the 2008 to 2017 laboratory totals, with a median of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Chambers County beside the counties around it is how this page reads it.
What these figures count
Only 3 tests were reported to CDC for Chambers 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).
Chambers County, Compared
Chambers County radon figures, compared
Calculated by Radon411CDC's largest figure for Chambers County rests on 3 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 33.3 points and no rank or comparison is drawn from it. Results reached as high as 0.4 pCi/L, with a middle value of 0.1 pCi/L.
Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: Harris County reported the largest share at or above 4 pCi/L, 3.1%, and Galveston County the smallest, 0.0%. Farther out, Brazoria County (63 miles away) at 6.3%, Montgomery County (66 miles away) at 7.1% and Fort Bend County (71 miles away) at 3.4% 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 Chambers County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 98% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Chambers County, Geology
The ground under Chambers County
PredictedUSGS's geologic map puts all of Chambers County's mapped land in one class: low radon potential. 98.3% of it lies in the area the map calls Coastal Plain, 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 |
|---|---|---|---|---|
| Coastal Plain | Cretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite. | Low | 7 | 98.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Chambers County beside the ground around it
Across Texas 0.5% of the land is rated high; none of Chambers County's is. None of the 4 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Chambers County, Local resources
Radon testing and mitigation in Chambers 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
Chambers County, Questions
Questions about radon in Chambers County
Are radon levels high in Chambers County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Chambers County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the counties bordering it, 2 have a figure over the 2007 to 2016 laboratory totals: Harris County reported the largest share at or above 4 pCi/L, 3.1%, and Galveston County the smallest, 0.0%.
Which counties border Chambers County?
Chambers County borders 4 counties: Jefferson County, Galveston County, Liberty County and Harris County.
Products
Chambers County, Products
Testing a home in Chambers County
No CDC figure names Chambers County; the nearest county with one, Galveston County (32 miles away), reported 0.0% 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 Chambers 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
Chambers County, Bordering counties
Counties bordering Chambers County
Calculated by Radon411- Radon levels in Jefferson CountyEPA zone 3
4.8%at or above 4 pCi/L
Median 0.1 pCi/L · 21 tests
- Radon levels in Harris CountyEPA zone 3
3.1%at or above 4 pCi/L
Median 0.2 pCi/L · 775 tests
- Radon levels in Galveston CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.2 pCi/L · 83 tests
- Radon levels in Liberty CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 1 test
Chambers County, Cities and towns
Cities and towns in Chambers County
Chambers County is growing: the Census Bureau puts it at 57,594 residents on July 1, 2025, up 22.6% from 46,992 in 2020. That works out to 96 people per square mile of land. Baytown, the largest place on its list (86,561 residents in all), extends beyond Chambers County, so no share of the total is worked out for it. Reported testing is thin here: 3 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Texas as a whole comes to 0.1.
From Baytown to Morgan's Point, CDC publishes no figure by town: each reads Chambers County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Baytownextends beyond Chambers County | 86,561 | +1.4% | Counted whole |
| Texas Cityextends beyond Chambers County | 59,733 | +14.3% | Counted whole |
| Seabrookextends beyond Chambers County | 13,974 | +2.9% | Counted whole |
| Mont Belvieuextends beyond Chambers County | 10,673 | +35.6% | Counted whole |
| Beach City | 3,438 | +6.3% | 6.0% |
| Anahuac | 2,023 | +2.8% | 3.5% |
| Shoreacresextends beyond Chambers County | 1,535 | −1.3% | Counted whole |
| Old River-Winfreeextends beyond Chambers County | 1,495 | +12.5% | Counted whole |
| Cove | 705 | +27.5% | 1.2% |
| Morgan's Pointextends beyond Chambers County | 272 | +1.1% | Counted whole |
10 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 Chambers County is counted whole, so it has no share.
Chambers County, Homes
Homes in Chambers County
Chambers County is a place of houses on their own lots: 81% of its 18,144 homes are detached single-family houses, against 65% across Texas. Much of Chambers County is recent building: 54% 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 | Chambers County | Texas |
|---|---|---|
| Housing units | 18,144 | 11,890,808 |
| Detached houses | 81% | 65% |
| In buildings of 5 or more | 4% | 21% |
| Mobile homes | 13% | 7% |
| Built before 1960 | 8% | 13% |
| Built since 2000 | 54% | 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.