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Radon Levels in Dinwiddie County, Virginia

EPA puts Dinwiddie County in Zone 1, its highest radon zone, and only 20 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    23.4%

    6.9 pts below VA

    Dinwiddie
    23.4%
    Virginia
    30.3%

    64 tests, 2005 to 2014

  • Median result

    2.7pCi/L

    Below action level

    Dinwiddie
    2.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2005 to 2014

  • Tests reported

    64

    65th of 80 by tests

    Dinwiddie
    64
    Fairfax
    6,409

    Reported to CDC before any fix, 2005 to 2014

  • 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

    62 of 80

    Lowest quarter

    Dinwiddie
    23.4%
    Russell
    67.9%

    By share, of 80 with 30+ tests

Read a result for Dinwiddie County

Starts at Dinwiddie County's median, 2.7 pCi/L

2.7pCi/L

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

EPA’s reading of 2.7 pCi/L

Between 2 and 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Dinwiddie County's median reported result, 2005 to 2014.

Interpret this readingWhat a fix costs

The data

Dinwiddie County, At a glance

Dinwiddie County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Dinwiddie County 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 67% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

CDC holds 20 reported tests for Dinwiddie County over the 2008 to 2017 laboratory totals, with a median of 1.9 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Dinwiddie County beside the counties around it is how this page reads it.

What these figures count

Only 20 tests were reported to CDC for Dinwiddie 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

Dinwiddie County, Compared

Dinwiddie County radon figures, compared

Calculated by Radon411

Dinwiddie County's 64 reported tests over the 2005 to 2014 laboratory totals had a middle value of 2.7 pCi/L and a maximum of 19.5 pCi/L, and 23.4% reached 4 pCi/L. Virginia as a whole (132 Virginia counties, pooled) comes to 30.3%: 6.9 points higher than here.

The newest figure, over the 2008 to 2017 laboratory totals, counts only 20 tests (35.0% at or above 4 pCi/L), too few to compare, so this reading uses the 64-test figure.

Among its state's counties it ranks 62nd of 80 Virginia counties with 30 or more tests for the same period. Statewide for the same period, Russell County reported the highest share (67.9%) and Norfolk city the lowest (1.9%).

Below the action level, 22 tests (34.4%) came in under 2 pCi/L, against 45.3% statewide, and 27 tests (42.2%) fell between 2 and 4, against 24.4% statewide. CDC's ten-year totals for Dinwiddie County went from 64 tests (2005 to 2014) to 20 (2008 to 2017), the share going from 23.4% to 35.0%.

EPA's 1993 zone map puts Dinwiddie County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 67% of the county's land high radon potential.

Next door, the shares run from 29.7% in Chesterfield County to 34.4% in Brunswick County.

Dinwiddie County against Virginia, the United States and nearby counties, 2005 to 2014, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Dinwiddie County
Dinwiddie County6423.4%2.7 pCi/LThis county
Virginia, pooled132 counties, pooled39,39130.3%Not pooled+6.9 points
United States, pooled2,655 counties, pooled1,669,35336.0%Not pooled+12.6 points
Russell Countyhighest in the state5367.9%6.7 pCi/L+44.5 points
Norfolk citylowest in the state521.9%0.6 pCi/L−21.5 points
Brunswick County, VAborders it3234.4%3.4 pCi/L+11.0 points
Chesterfield County, VAborders it57229.7%2.1 pCi/L+6.3 points
Amelia County, VAborders it1428.6%2.1 pCi/L+5.2 points
Nottoway County, VAborders it1827.8%1.4 pCi/L+4.4 points
Prince George County, VAborders it1020.0%2.4 pCi/L−3.4 points
Petersburg city, VAborders it70.0%0.7 pCi/L−23.4 points
Sussex County, VAborders it10.0%0.1 pCi/L−23.4 points
Greensville County, VAborders it20.0%0.7 pCi/L−23.4 points
Where Dinwiddie County's reported results fell, 2005 to 2014, laboratory, beside Virginia and the United States
ResultDinwiddie County testsDinwiddie County shareVirginia shareU.S. shareAgainst Virginia
Under 2 pCi/L2234.4%45.3%39.8%−10.9 points
2 to 4 pCi/L2742.2%24.4%24.2%+17.8 points
4 pCi/L and above1523.4%30.3%36.0%−6.9 points
Dinwiddie County ranked among the 80 Virginia counties with 30 or more tests, by share at or above 4 pCi/L, 2005 to 2014, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Lynchburg city57 of 8044526.7%2.1 pCi/L
Henrico County58 of 8047525.9%1.9 pCi/L
Roanoke city59 of 801,07625.7%2.1 pCi/L
Fredericksburg city60 of 8020924.9%2.3 pCi/L
Albemarle County61 of 801,59624.8%2.1 pCi/L
Dinwiddie County62 of 806423.4%2.7 pCi/L
Franklin County63 of 8047522.5%2.0 pCi/L
Charlottesville city64 of 8059122.0%1.8 pCi/L
Bedford County65 of 8057521.4%2.0 pCi/L
Roanoke County66 of 801,66319.8%1.8 pCi/L
Wise County67 of 804619.6%0.9 pCi/L
Dinwiddie County ten-year laboratory totals, against Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestVirginia, pooledChange from the row before
2008 to 20172035.0%1.9 pCi/L11.8 pCi/L30.4%+5.0 points
2007 to 20162030.0%2.1 pCi/L19.5 pCi/L30.6%−8.9 points
2006 to 20151838.9%2.9 pCi/L19.5 pCi/L30.7%+15.5 points
2005 to 20146423.4%2.7 pCi/L19.5 pCi/L30.3%First on file

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

Dinwiddie County, Geology

The ground under Dinwiddie County

Predicted

USGS's geologic map splits Dinwiddie County: 67.4% of its land is high radon potential and 32.6% low. The map puts 67.4% of Dinwiddie County in the area it calls Goochland Terrane and 32.6% in Tertiary Coastal Plain Sediments. USGS gives the first a radon index of 13, in the high band (12 to 17), and the second 8, in the low band (5 to 8).

USGS's geologic areas under Dinwiddie County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Goochland TerraneGranite, pegmatites, granitic gneiss, schist and gneiss, slate, and phyllite.High1367.4%
Tertiary Coastal Plain SedimentsTertiary Coastal Plain sand, silt, clayLow832.6%

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

Dinwiddie County beside the ground around it

Dinwiddie County has more high-potential ground than Virginia as a whole: 67.4% of its land against 47.9%. Of the 8 counties that border it, 3 have more high-potential ground, Nottoway County the most at 100%.

Share of land by USGS radon potential: Dinwiddie County, the 8 counties bordering it and Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Dinwiddie CountyZone 132.6%None67.4%
Petersburg cityZone 1100%NoneNone
Brunswick CountyZone 112.9%0.2%86.9%
Prince George CountyZone 395.4%NoneNone
Sussex CountyZone 3100%NoneNone
Chesterfield CountyZone 138.9%27.0%33.8%
Nottoway CountyZone 1NoneNone100%
Greensville CountyZone 399.5%None0.5%
Amelia CountyZone 1None7.2%92.8%
Virginia133 counties, pooled by land areaVaries20.6%30.0%47.9%

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

Local help

Dinwiddie County, Local resources

Radon testing and mitigation in Dinwiddie 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

Dinwiddie County, Questions

Questions about radon in Dinwiddie County

Are radon levels high in Dinwiddie County?

Over the 2008 to 2017 laboratory totals, 35.0% of the radon tests reported to CDC for Dinwiddie County, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.9 pCi/L. Of 80 Virginia counties with 30 or more tests for the same period, 61 reported a higher share; pooled, the state comes to 30.3%.

Which counties border Dinwiddie County?

Dinwiddie County borders 8 counties: Petersburg city, Brunswick County, Prince George County, Sussex County, Chesterfield County, Nottoway County, Greensville County and Amelia County.

Products

Dinwiddie County, Products

Testing a home in Dinwiddie County

In Dinwiddie County, 23.4% of 64 tests reported to CDC over the 2005 to 2014 laboratory totals reached 4 pCi/L, against 30.3% pooled across Virginia. In Zone 1 the year-round level in Dinwiddie County 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

Dinwiddie County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Dinwiddie County

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Dinwiddie County, Bordering counties

Counties bordering Dinwiddie County

Calculated by Radon411

Dinwiddie County, Cities and towns

Cities and towns in Dinwiddie County

The Census Bureau estimates 28,896 residents in Dinwiddie County for July 1, 2025, 1,010 more than in 2020 (+3.6%). That works out to 57 people per square mile of land. McKenney, its one incorporated place, has 469 residents, 1.6% of the total. Reported testing is thin here: 64 tests over 2005 to 2014, or 2.2 for every 1,000 residents (2025 estimate), where Virginia as a whole comes to 4.4.

McKenney is the one incorporated place here; CDC publishes no figure by town, so it reads Dinwiddie County's.

McKenney, Dinwiddie County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
McKenney469+3.3%1.6%

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).

Dinwiddie County, Homes

Homes in Dinwiddie County

Dinwiddie County is a place of houses on their own lots: 84% of its 11,896 homes are detached single-family houses, against 61% across Virginia. Half of its homes were built before 1986, close to Virginia's 1984: 14% date from before 1960 and 27% from 2000 or later. Owners live in 78% of the occupied homes (Virginia: 67%), so for most households a test and a fix are their own to order.

Homes in Dinwiddie County, Virginia, 2019 to 2023
HomesDinwiddie CountyVirginia
Housing units11,8963,654,784
Detached houses84%61%
In buildings of 5 or more2%19%
Mobile homes12%4%
Built before 196014%19%
Built since 200027%25%
Middle year built19861984
Owner-occupied78%67%

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