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Radon Levels in Fort Bend County, Texas

EPA puts Fort Bend County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 2.9% of 105 (2008 to 2017, laboratory totals) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    2.9%

    7.3 pts below TX

    Fort Bend
    2.9%
    Texas
    10.2%

    105 tests, 2008 to 2017

  • Median result

    0.2pCi/L

    Below action level

    Fort Bend
    0.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    105

    10th of 22 by tests

    Fort Bend
    105
    Harris
    733

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

  • Rank in Texas

    16 of 22

    Middle half

    Fort Bend
    2.9%
    Randall
    69.0%

    By share, of 22 with 30+ tests

Read a result for Fort Bend County

Starts at Fort Bend County's median, 0.2 pCi/L

0.2pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 0.2 pCi/L

Below 2 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Fort Bend County's median reported result, 2008 to 2017.

Interpret this reading

The data

Fort Bend County, At a glance

Fort Bend County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Fort Bend County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

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 Fort Bend County, 2008 to 2017, laboratory

Reported results by concentration band, Fort Bend County, 2008 to 2017, laboratory
Under 2 pCi/L: 97%2 to 4 pCi/L: 0%4 pCi/L and above: 3%

Of 105 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Fort Bend County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L10297.1%
2 to 4 pCi/L00.0%
4 pCi/L and above32.9%
What these figures count

These are the 105 tests reported to CDC for Fort Bend County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Fort Bend County, Compared

Fort Bend County radon figures, compared

Calculated by Radon411

Only 3 of 105 radon tests reported for Fort Bend County over the 2008 to 2017 laboratory totals reached 4 pCi/L (2.9%). The median result, 0.2 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 18.1 pCi/L.

Across 138 Texas counties pooled together, 10.2% of tests reached that level, so Fort Bend County runs 7.3 points below its state. Against the national pool of 35.7%, the gap is 32.8 points lower. Its place in the state: 16th of 22 Texas counties with 30 or more tests for the same period.

Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 2.9% share point the same way here. Of 2 neighbours with a figure, all 2 reported a larger share at or above 4 pCi/L; the spread is 2.9% (Harris County) to 6.3% (Brazoria County).

Below the action level, 102 tests (97.1%) came in under 2 pCi/L, against 80.3% statewide, and 0 tests (0.0%) fell between 2 and 4, against 9.6% statewide. USGS geology rates 100% of the county's land low radon potential.

CDC's ten-year totals for Fort Bend County went from 110 tests (2005 to 2014) to 105 (2008 to 2017), the share going from 3.6% to 2.9%.

Fort Bend County against Texas, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Fort Bend County
Fort Bend County1052.9%0.2 pCi/LThis county
Texas, pooled138 counties, pooled4,61510.2%Not pooled+7.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+32.8 points
Randall Countyhighest in the state8769.0%6.1 pCi/L+66.1 points
Nueces Countylowest in the state430.0%0.6 pCi/L−2.9 points
Brazoria County, TXborders it326.3%0.3 pCi/L+3.4 points
Harris County, TXborders it7332.9%0.4 pCi/LLevel
Austin County, TXborders it20.0%0.1 pCi/L−2.9 points
Wharton County, TXborders it90.0%0.5 pCi/L−2.9 points
Waller County, TXborders it70.0%0.1 pCi/L−2.9 points
Where Fort Bend County's reported results fell, 2008 to 2017, laboratory, beside Texas and the United States
ResultFort Bend County testsFort Bend County shareTexas shareU.S. shareAgainst Texas
Under 2 pCi/L10297.1%80.3%39.6%+16.8 points
2 to 4 pCi/L00.0%9.6%24.7%−9.6 points
4 pCi/L and above32.9%10.2%35.7%−7.3 points
Fort Bend County ranked among the 22 Texas counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Bexar County11 of 222016.5%0.6 pCi/L
Brazoria County12 of 22326.3%0.3 pCi/L
Smith County13 of 22525.8%0.8 pCi/L
Montgomery County14 of 221883.2%0.8 pCi/L
Harris County15 of 227332.9%0.4 pCi/L
Fort Bend County16 of 221052.9%0.2 pCi/L
Williamson County17 of 221031.9%0.7 pCi/L
Midland County18 of 221001.0%0.7 pCi/L
Galveston County19 of 22730.0%0.2 pCi/L
El Paso County19 of 22570.0%0.7 pCi/L
Brazos County19 of 22470.0%0.5 pCi/L
Fort Bend County ten-year laboratory totals, against Texas' pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTexas, pooledChange from the row before
2008 to 20171052.9%0.2 pCi/L18.1 pCi/L10.2%−0.5 points
2007 to 20161173.4%0.2 pCi/L18.1 pCi/L10.4%−0.2 points
2006 to 20151113.6%0.2 pCi/L18.1 pCi/L11.0%Level
2005 to 20141103.6%0.2 pCi/L18.1 pCi/L10.6%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Fort Bend County, Geology

The ground under Fort Bend County

Predicted

USGS's geologic map puts all of Fort Bend County's mapped land in one class: low radon potential. All 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).

USGS's geologic areas under Fort Bend County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Coastal PlainCretaceous through Quaternary marine sandstone, shale, chalk, limestone, siltstone, clay, and lignite.Low7100%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Fort Bend County beside the ground around it

Across Texas 0.5% of the land is rated high; none of Fort Bend County's is. None of the 5 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Fort Bend County, the 5 counties bordering it and Texas
AreaEPA zoneLow potentialModerate potentialHigh potential
Fort Bend CountyZone 3100%NoneNone
Brazoria CountyZone 398.0%NoneNone
Harris CountyZone 3100%NoneNone
Wharton CountyZone 3100%NoneNone
Waller CountyZone 3100%NoneNone
Austin CountyZone 3100%NoneNone
Texas254 counties, pooled by land areaVaries72.4%26.8%0.5%

The map rates the ground, not the air in any home.

Local help

Fort Bend County, Local resources

Radon testing and mitigation in Fort Bend County

Listed radon professionals by town: Houston

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

Fort Bend County, Questions

Questions about radon in Fort Bend County

Are radon levels high in Fort Bend County?

Over the 2008 to 2017 laboratory totals, 2.9% of the radon tests reported to CDC for Fort Bend County, Texas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.2 pCi/L. Of 22 Texas counties with 30 or more tests for the same period, 15 reported a higher share; pooled, the state comes to 10.2%.

Which counties border Fort Bend County?

Fort Bend County borders 5 counties: Brazoria County, Harris County, Wharton County, Waller County and Austin County.

Products

Fort Bend County, Products

Testing a home in Fort Bend County

In Fort Bend County, 2.9% of 105 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 10.2% pooled across Texas. 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 Fort Bend County.

Test kits and monitors3

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Best radon monitors for Fort Bend County homes, compared

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Fort Bend County, Bordering counties

Counties bordering Fort Bend County

Calculated by Radon411

Fort Bend County, Cities and towns

Cities and towns in Fort Bend County

Fort Bend County is growing: the Census Bureau puts it at 975,191 residents on July 1, 2025, up 17.4% from 830,347 in 2020. Packed into its land, that is 1,132 people per square mile. Houston, the largest place on its list (2,397,315 residents in all), extends beyond Fort Bend County, so no share of the total is worked out for it. CDC's 105 reported tests for 2008 to 2017 work out to 0.1 per 1,000 residents (2025 estimate), close to Texas' 0.1.

From Houston to Thompsons, CDC publishes no figure by town: each reads Fort Bend County's.

The 12 largest cities and towns in Fort Bend County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Houstonextends beyond Fort Bend County2,397,315+4.3%Counted whole
Pearlandextends beyond Fort Bend County129,930+1.7%Counted whole
Sugar Land107,726−2.8%11.0%
Missouri Cityextends beyond Fort Bend County77,327+3.9%Counted whole
Fulshear64,630+276.1%6.6%
Rosenberg42,701+10.9%4.4%
Katyextends beyond Fort Bend County28,373+26.5%Counted whole
Staffordextends beyond Fort Bend County18,043+3.8%Counted whole
Richmond13,389+15.2%1.4%
Weston Lakes4,570+17.5%0.5%
Meadows Place4,546−4.5%0.5%
Needville3,114+1.0%0.3%
  • Arcola
  • Pleak
  • Fairchilds
  • Beasley
  • Simonton
  • Kendleton
  • Orchard
  • Thompsons

20 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 Fort Bend County is counted whole, so it has no share.

Fort Bend County, Homes

Homes in Fort Bend County

Fort Bend County is a place of houses on their own lots: 84% of its 293,694 homes are detached single-family houses, against 65% across Texas. Much of Fort Bend County is recent building: 59% of its homes have gone up since 2000 and the middle year built is 2004, against 1990 for Texas. Owners live in 77% of the occupied homes (Texas: 63%), so for most households a test and a fix are their own to order.

Homes in Fort Bend County, Texas, 2019 to 2023
HomesFort Bend CountyTexas
Housing units293,69411,890,808
Detached houses84%65%
In buildings of 5 or more10%21%
Mobile homes3%7%
Built before 19602%13%
Built since 200059%37%
Middle year built20041990
Owner-occupied77%63%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.