Skip to content
RADON411

Locations and reports

Radon Levels in Falls Church city, Virginia

EPA puts Falls Church city in Zone 1, its highest radon zone, and 18.1% of its 83 reported radon tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    18.1%

    12.3 pts below VA

    Falls Church city
    18.1%
    Virginia
    30.4%

    83 tests, 2008 to 2017

  • Median result

    1.5pCi/L

    Below action level

    Falls Church city
    1.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    83

    63rd of 84 by tests

    Falls Church city
    83
    Fairfax
    8,657

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Virginia

    74 of 84

    Lowest quarter

    Falls Church city
    18.1%
    Russell
    67.3%

    By share, of 84 with 30+ tests

Read a result for Falls Church city

Starts at Falls Church city's median, 1.5 pCi/L

1.5pCi/L

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

EPA’s reading of 1.5 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. Falls Church city's median reported result, 2008 to 2017.

Interpret this reading

The data

Falls Church city, At a glance

Falls Church city at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Falls Church city in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Falls Church city, 2008 to 2017, laboratory

Reported results by concentration band, Falls Church city, 2008 to 2017, laboratory
Under 2 pCi/L: 63%2 to 4 pCi/L: 19%4 pCi/L and above: 18%

Of 83 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Falls Church city, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L5262.7%
2 to 4 pCi/L1619.3%
4 pCi/L and above1518.1%
What these figures count

These are the 83 tests reported to CDC for Falls Church city 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

Falls Church city, Compared

Falls Church city radon figures, compared

Calculated by Radon411

Falls Church city's 83 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.5 pCi/L and a maximum of 30.2 pCi/L, and 18.1% reached 4 pCi/L. Virginia as a whole (131 Virginia counties, pooled) comes to 30.4%: 12.3 points higher than here.

Among its state's counties it ranks 74th of 84 Virginia counties with 30 or more tests for the same period. Statewide for the same period, Russell County reported the highest share (67.3%) and Norfolk city the lowest (2.7%).

Below the action level, 52 tests (62.7%) came in under 2 pCi/L, against 44.7% statewide, and 16 tests (19.3%) fell between 2 and 4, against 24.9% statewide. CDC's ten-year totals for Falls Church city went from 56 tests (2005 to 2014) to 83 (2008 to 2017), the share going from 14.3% to 18.1%.

EPA's 1993 zone map puts Falls Church city in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.

Falls Church city against Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Falls Church city
Falls Church city8318.1%1.5 pCi/LThis county
Virginia, pooled131 counties, pooled53,19930.4%Not pooled+12.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+17.6 points
Russell Countyhighest in the state4967.3%6.7 pCi/L+49.2 points
Norfolk citylowest in the state732.7%0.5 pCi/L−15.4 points
Where Falls Church city's reported results fell, 2008 to 2017, laboratory, beside Virginia and the United States
ResultFalls Church city testsFalls Church city shareVirginia shareU.S. shareAgainst Virginia
Under 2 pCi/L5262.7%44.7%39.6%+18.0 points
2 to 4 pCi/L1619.3%24.9%24.7%−5.6 points
4 pCi/L and above1518.1%30.4%35.7%−12.3 points
Falls Church city ranked among the 84 Virginia counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Franklin County69 of 8457221.2%2.0 pCi/L
Charlottesville city70 of 8483421.0%1.8 pCi/L
Halifax County71 of 843718.9%2.2 pCi/L
Lexington city72 of 843218.8%1.6 pCi/L
Fairfax County73 of 848,65718.7%1.5 pCi/L
Falls Church city74 of 848318.1%1.5 pCi/L
Manassas city75 of 8414515.9%1.9 pCi/L
Fairfax city76 of 8412614.3%1.4 pCi/L
Arlington County77 of 841,10113.7%1.4 pCi/L
Westmoreland County78 of 845610.7%1.4 pCi/L
Appomattox County79 of 845010.0%2.1 pCi/L
Falls Church city ten-year laboratory totals, against Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestVirginia, pooledChange from the row before
2008 to 20178318.1%1.5 pCi/L30.2 pCi/L30.4%−3.0 points
2007 to 20167621.1%1.6 pCi/L7.9 pCi/L30.6%+0.3 points
2006 to 20157220.8%1.3 pCi/L7.9 pCi/L30.7%+6.5 points
2005 to 20145614.3%1.1 pCi/L6.3 pCi/L30.3%First on file

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

Falls Church city, Geology

The ground under Falls Church city

Predicted

USGS's geologic map puts all of Falls Church city's mapped land in one class: high radon potential. All of it lies in the area the map calls Inner Piedmont, to which USGS gives a radon index of 12, in the high band (12 to 17).

USGS's geologic areas under Falls Church city
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Inner PiedmontGranite, pegmatites, granitic gneiss, schist and gneiss, slate, and phyllite.High12100%

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

Falls Church city beside the ground around it

Falls Church city has more high-potential ground than Virginia as a whole: 100% of its land against 47.9%.

Share of land by USGS radon potential: Falls Church city and Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Falls Church cityZone 1NoneNone100%
Virginia133 counties, pooled by land areaVaries20.6%30.0%47.9%

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

Local help

Falls Church city, Local resources

Radon testing and mitigation in Falls Church city

What Virginia's program says
Phone
(804) 864-8161
Email
Radon@vdh.virginia.gov
Licensing of radon professionals
The Code of Virginia requires that Radon testers and mitigators be currently certified by either the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).

What it means

Falls Church city, Questions

Questions about radon in Falls Church city

Are radon levels high in Falls Church city?

Over the 2008 to 2017 laboratory totals, 18.1% of the radon tests reported to CDC for Falls Church city, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. Of 84 Virginia counties with 30 or more tests for the same period, 73 reported a higher share; pooled, the state comes to 30.4%.

Which counties border Falls Church city?

No county is recorded as sharing a land boundary with Falls Church city.

Products

Falls Church city, Products

Testing a home in Falls Church city

In Falls Church city, 18.1% of 83 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.4% pooled across Virginia. In Zone 1 the year-round level in Falls Church city is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Falls Church city is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Falls Church city

Explore

Falls Church city, Bordering counties

Counties bordering Falls Church city

Calculated by Radon411

No bordering counties on file

Falls Church city has no county recorded as sharing a land boundary with it. Island and coastal county equivalents legitimately have none.

Falls Church city, Cities and towns

Cities and towns in Falls Church city

The Census Bureau estimates 15,159 residents in Falls Church city for July 1, 2025, 482 more than in 2020 (+3.3%). Packed into its land, that is 7,407 people per square mile. Falls Church, its one incorporated place, has 15,159 residents, 100.0% of the total. CDC's 83 reported tests for 2008 to 2017 work out to 5.5 per 1,000 residents (2025 estimate), close to Virginia's 6.0.

Falls Church is the one incorporated place here; CDC publishes no figure by town, so it reads Falls Church city's.

Falls Church, Falls Church city: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Falls Church15,159+3.3%100.0%

One incorporated place, 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).

Falls Church city, Homes

Homes in Falls Church city

Falls Church city has 6,360 homes, and many share a building: 49% are in buildings of five or more, 36% are detached houses, against 61% across Virginia. The homes are older than Virginia's as a whole: half were built before 1971 (1984 for Virginia), and 33% date from before 1960. 50% of occupied homes are lived in by their owner (Virginia: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Falls Church city, Virginia, 2019 to 2023
HomesFalls Church cityVirginia
Housing units6,3603,654,784
Detached houses36%61%
In buildings of 5 or more49%19%
Mobile homesunder 1%4%
Built before 196033%19%
Built since 200029%25%
Middle year built19711984
Owner-occupied50%67%

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