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Radon Levels in Gloucester County, Virginia

EPA puts Gloucester County in Zone 3, its lowest radon zone, and only 8 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

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  • Highest bordering

    38.4%

    James City County

    James City
    38.4%

    1 of 5 neighbours have 30+ tests, 2006 to 2015

  • Nearest county

    38.4%

    James City County, 14 miles

    James City
    38.4%
    Virginia
    30.7%

    Share at 4+ pCi/L, 73 tests, 2006 to 2015

  • Ground above low

    None

    77.9 pts below Virginia

    Gloucester
    0.0%
    Virginia
    77.9%

    Share of land USGS rates moderate or high potential

  • Tests reported

    8

    Too few for a share

    Gloucester
    8
    Needed
    30

    2008 to 2017, laboratory

  • 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

Read a result for Gloucester County

Starts at EPA's action level

4.0pCi/L

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

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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.

Interpret this readingWhat a fix costs

The data

Gloucester County, At a glance

Gloucester County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Gloucester 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 87% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Gloucester County, 2008 to 2017, laboratory

CDC holds 8 reported tests for Gloucester County over the 2008 to 2017 laboratory totals, with a median of 2.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Gloucester County beside the counties around it is how this page reads it.

What these figures count

Only 8 tests were reported to CDC for Gloucester 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).

How to read these figures

Gloucester County, Compared

Gloucester County radon figures, compared

Calculated by Radon411

CDC's largest figure for Gloucester County rests on 8 tests over the 2008 to 2017 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 12.5 points and no rank or comparison is drawn from it. Results reached as high as 13.3 pCi/L, with a middle value of 2.0 pCi/L.

James City County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 38.4% of its tests at or above 4 pCi/L. Farther out, Newport News city (21 miles away) at 5.9%, Norfolk city (39 miles away) at 5.3% and Henrico County (48 miles away) at 25.7% have figures too. Pooled across 132 Virginia counties, 30.7% of reported tests reached that level; across every county in the country with a figure, 36.3%.

Statewide for the same period, Russell County reported the highest share (68.5%) and Norfolk city the lowest (5.3%). EPA's 1993 map puts Gloucester County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 87% of the county's land low radon potential.

Virginia, the United States and the counties around Gloucester County, 2006 to 2015, laboratory
AreaTestsAt or above 4 pCi/LMedian
Virginia, pooled132 counties, pooled44,81730.7%Not pooled
United States, pooled2,669 counties, pooled1,805,52836.3%Not pooled
Russell Countyhighest in the state5468.5%6.7 pCi/L
Norfolk citylowest in the state575.3%0.7 pCi/L
Mathews County, VAborders it366.7%4.0 pCi/L
James City County, VAborders it7338.4%2.4 pCi/L
King and Queen County, VAborders it728.6%2.4 pCi/L
York County, VAborders it2218.2%1.2 pCi/L
Middlesex County, VAborders it30.0%2.6 pCi/L
The nearest Virginia counties to Gloucester County with 30 or more tests, 2006 to 2015, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
James City County14 mi7338.4%2.4 pCi/L
Newport News city21 mi345.9%1.4 pCi/L
Norfolk city39 mi575.3%0.7 pCi/L
Henrico County48 mi57325.7%2.0 pCi/L
Westmoreland County50 mi3514.3%1.6 pCi/L
Richmond city52 mi44328.0%2.1 pCi/L
Chesapeake city53 mi437.0%0.1 pCi/L
Virginia Beach city55 mi547.4%0.6 pCi/L
Gloucester County ten-year laboratory totals, against Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestVirginia, pooledChange from the row before
2008 to 2017825.0%2.0 pCi/L13.3 pCi/L30.4%−3.6 points
2007 to 2016728.6%2.1 pCi/L13.3 pCi/L30.6%Level
2006 to 2015728.6%2.1 pCi/L13.3 pCi/L30.7%+11.9 points
2005 to 2014616.7%1.5 pCi/L13.3 pCi/L30.3%First on file

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

Gloucester County, Geology

The ground under Gloucester County

Predicted

USGS's geologic map puts all of Gloucester County's mapped land in one class: low radon potential. The map puts 71.4% of Gloucester County in the area it calls Tertiary Coastal Plain Sediments and 16.1% in Quaternary Coastal Plain Sediments. USGS gives the first a radon index of 8 and the second 6, both in the low band (5 to 8).

USGS's geologic areas under Gloucester County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Tertiary Coastal Plain SedimentsTertiary Coastal Plain sand, silt, clayLow871.4%
Quaternary Coastal Plain SedimentsQuaternary coastal sand and silt containing monazite.Low616.1%

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

Gloucester County beside the ground around it

Across Virginia 47.9% of the land is rated high; none of Gloucester County's is. None of the 5 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Gloucester County, the 5 counties bordering it and Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Gloucester CountyZone 387.5%NoneNone
Mathews CountyZone 381.4%NoneNone
York CountyZone 385.4%NoneNone
James City CountyZone 393.5%NoneNone
Middlesex CountyZone 393.8%NoneNone
King and Queen CountyZone 398.2%NoneNone
Virginia133 counties, pooled by land areaVaries20.6%30.0%47.9%

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

Local help

Gloucester County, Local resources

Radon testing and mitigation in Gloucester County

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

Gloucester County, Questions

Questions about radon in Gloucester County

Are radon levels high in Gloucester County?

Over the 2008 to 2017 laboratory totals, 25.0% of the radon tests reported to CDC for Gloucester County, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. James City County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 38.4% of its tests at or above 4 pCi/L.

Which counties border Gloucester County?

Gloucester County borders 5 counties: Mathews County, York County, James City County, Middlesex County and King and Queen County.

Products

Gloucester County, Products

Testing a home in Gloucester County

No CDC figure names Gloucester County; the nearest county with one, James City County (14 miles away), reported 38.4% of its tests at or above 4 pCi/L over the 2006 to 2015 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 Gloucester County.

Test kits and monitors3

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Best radon monitors for Gloucester County homes, compared

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Gloucester County, Bordering counties

Counties bordering Gloucester County

Calculated by Radon411

Gloucester County, Residents

Who lives in Gloucester County

The Census Bureau estimates 40,097 residents in Gloucester County for July 1, 2025, 1,374 more than in 2020 (+3.5%). That works out to 184 people per square mile of land. Reported testing is thin here: 8 tests over 2008 to 2017, or 0.2 for every 1,000 residents (2025 estimate), where Virginia as a whole comes to 6.0.

Census lists no incorporated place in Gloucester County: every home in it reads the county's figures.

Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Gloucester County, Homes

Homes in Gloucester County

Gloucester County is a place of houses on their own lots: 82% of its 17,204 homes are detached single-family houses, against 61% across Virginia. Half of its homes were built before 1986, close to Virginia's 1984: 18% date from before 1960 and 28% from 2000 or later. Owners live in 80% of the occupied homes (Virginia: 67%), so for most households a test and a fix are their own to order.

Homes in Gloucester County, Virginia, 2019 to 2023
HomesGloucester CountyVirginia
Housing units17,2043,654,784
Detached houses82%61%
In buildings of 5 or more4%19%
Mobile homes9%4%
Built before 196018%19%
Built since 200028%25%
Middle year built19861984
Owner-occupied80%67%

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