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Radon Levels in Queen Anne's County, Maryland

EPA puts Queen Anne's County in Zone 3, its lowest radon zone, and 16.9% of its 65 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

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  • Share at 4+ pCi/L

    16.9%

    7.0 pts below MD

    Queen Anne's
    16.9%
    Maryland
    23.9%

    65 tests, 2008 to 2017

  • Median result

    1.3pCi/L

    Below action level

    Queen Anne's
    1.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    65

    17th of 19 by tests

    Queen Anne's
    65
    Montgomery
    10,969

    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 Maryland

    17 of 19

    Lowest quarter

    Queen Anne's
    16.9%
    Washington
    56.0%

    By share, of 19 with 30+ tests

Read a result for Queen Anne's County

Starts at Queen Anne's County's median, 1.3 pCi/L

1.3pCi/L

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

EPA’s reading of 1.3 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. Queen Anne's County's median reported result, 2008 to 2017.

Interpret this reading

The data

Queen Anne's County, At a glance

Queen Anne's County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Queen Anne's 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 83% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Queen Anne's County, 2008 to 2017, laboratory

Reported results by concentration band, Queen Anne's County, 2008 to 2017, laboratory
Under 2 pCi/L: 63%2 to 4 pCi/L: 20%4 pCi/L and above: 17%

Of 65 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Queen Anne's County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L4163.1%
2 to 4 pCi/L1320.0%
4 pCi/L and above1116.9%
What these figures count

These are the 65 tests reported to CDC for Queen Anne's 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

Queen Anne's County, Compared

Queen Anne's County radon figures, compared

Calculated by Radon411

Queen Anne's County's 65 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.3 pCi/L and a maximum of 30.4 pCi/L, and 16.9% reached 4 pCi/L. Maryland as a whole (24 Maryland counties, pooled) comes to 23.9%: 7.0 points higher than here.

Among its state's counties it ranks 17th of 19 Maryland counties with 30 or more tests for the same period. Statewide for the same period, Washington County reported the highest share (56.0%) and Wicomico County the lowest (0.0%).

Below the action level, 41 tests (63.1%) came in under 2 pCi/L, against 56.6% statewide, and 13 tests (20.0%) fell between 2 and 4, against 19.5% statewide. CDC's ten-year totals for Queen Anne's County went from 36 tests (2005 to 2014) to 65 (2008 to 2017), the share going from 16.7% to 16.9%.

EPA's 1993 zone map puts Queen Anne's County in Zone 3, a predicted county average under 2 pCi/L. USGS geology rates 83% of the county's land low radon potential.

Next door, the shares run from 16.9% in Kent County, DE to 52.6% in Kent County.

CDC also counts 5 tests taken after mitigation in Queen Anne's County for the same period: tests in homes where a fix was already in.

Queen Anne's County against Maryland, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Queen Anne's County
Queen Anne's County6516.9%1.3 pCi/LThis county
Maryland, pooled24 counties, pooled47,94123.9%Not pooled+7.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+18.8 points
Washington Countyhighest in the state1,25956.0%5.2 pCi/L+39.1 points
Wicomico Countylowest in the state320.0%0.9 pCi/L−16.9 points
Kent County, MDborders it5752.6%4.4 pCi/L+35.7 points
Kent County, DEborders it1,51616.9%1.6 pCi/LLevel
Talbot County, MDborders it267.7%1.1 pCi/L−9.2 points
Caroline County, MDborders it120.0%0.8 pCi/L−16.9 points
Where Queen Anne's County's reported results fell, 2008 to 2017, laboratory, beside Maryland and the United States
ResultQueen Anne's County testsQueen Anne's County shareMaryland shareU.S. shareAgainst Maryland
Under 2 pCi/L4163.1%56.6%39.6%+6.5 points
2 to 4 pCi/L1320.0%19.5%24.7%+0.5 points
4 pCi/L and above1116.9%23.9%35.7%−7.0 points
Queen Anne's County ranked among the 19 Maryland counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Cecil County9 of 191,07124.9%1.9 pCi/L
Charles County10 of 1947724.1%1.8 pCi/L
Harford County11 of 195,28322.6%1.7 pCi/L
St. Mary's County12 of 1963620.9%1.8 pCi/L
Baltimore County13 of 197,70619.1%1.4 pCi/L
Prince George's County14 of 191,60319.0%1.4 pCi/L
Montgomery County15 of 1910,96918.0%1.3 pCi/L
Anne Arundel County16 of 194,08817.4%1.4 pCi/L
Queen Anne's County17 of 196516.9%1.3 pCi/L
Baltimore city18 of 191,1487.9%0.8 pCi/L
Wicomico County19 of 19320.0%0.9 pCi/L
Queen Anne's County ten-year laboratory totals, against Maryland's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMaryland, pooledChange from the row before
2008 to 20176516.9%1.3 pCi/L30.4 pCi/L23.9%−3.9 points
2007 to 20165320.8%1.3 pCi/L30.4 pCi/L24.4%+3.0 points
2006 to 20154517.8%1.3 pCi/L30.4 pCi/L24.9%+1.1 points
2005 to 20143616.7%1.4 pCi/L6.8 pCi/L24.6%First on file

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

Queen Anne's County, Geology

The ground under Queen Anne's County

Predicted

USGS's geologic map puts all of Queen Anne's County's mapped land in one class: low radon potential. 82.7% of it lies in the area the map calls Eastern Shore, to which USGS gives a radon index of 7, in the low band (5 to 8).

USGS's geologic areas under Queen Anne's County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Eastern ShoreQuaternary coastal sand, silt.Low782.7%

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

Queen Anne's County beside the ground around it

Across Maryland 36.7% of the land is rated high; none of Queen Anne's County's is. None of the 4 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Queen Anne's County, the 4 counties bordering it and Maryland
AreaEPA zoneLow potentialModerate potentialHigh potential
Queen Anne's CountyZone 382.7%NoneNone
Kent CountyZone 389.4%NoneNone
Caroline CountyZone 398.7%NoneNone
Talbot CountyZone 381.4%NoneNone
Kent County, DEZone 399.8%NoneNone
Maryland24 counties, pooled by land areaVaries29.9%27.6%36.7%

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

Local help

Queen Anne's County, Local resources

Radon testing and mitigation in Queen Anne's County

What Maryland's program says
Phone
1-866-703-3266

What it means

Queen Anne's County, Questions

Questions about radon in Queen Anne's County

Are radon levels high in Queen Anne's County?

Over the 2008 to 2017 laboratory totals, 16.9% of the radon tests reported to CDC for Queen Anne's County, Maryland were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.3 pCi/L. Of 19 Maryland counties with 30 or more tests for the same period, 16 reported a higher share; pooled, the state comes to 23.9%.

Which counties border Queen Anne's County?

Queen Anne's County borders 4 counties: Kent County, MD, Caroline County, MD, Talbot County, MD and Kent County, DE.

Products

Queen Anne's County, Products

Testing a home in Queen Anne's County

In Queen Anne's County, 16.9% of 65 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 23.9% pooled across Maryland. 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 Queen Anne's County.

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Best radon monitors for Queen Anne's County homes, compared

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Queen Anne's County, Bordering counties

Counties bordering Queen Anne's County

Calculated by Radon411

Queen Anne's County, Cities and towns

Cities and towns in Queen Anne's County

Queen Anne's County is growing: the Census Bureau puts it at 54,448 residents on July 1, 2025, up 8.8% from 50,039 in 2020. That works out to 146 people per square mile of land. No town dominates: Centreville, the largest, has 4,782 residents, 8.8% of the total. Reported testing is thin here: 65 tests over 2008 to 2017, or 1.2 for every 1,000 residents (2025 estimate), where Maryland as a whole comes to 7.7.

From Centreville to Templeville, CDC publishes no figure by town: each reads Queen Anne's County's.

The cities and towns in Queen Anne's County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Centreville4,782+1.2%8.8%
Church Hill817+1.1%1.5%
Queenstown711+0.9%1.3%
Millingtonextends beyond Queen Anne's County544−0.4%Counted whole
Sudlersville515+1.0%0.9%
Queen Anneextends beyond Queen Anne's County190−1.0%Counted whole
Barclay187+1.6%0.3%
Templevilleextends beyond Queen Anne's County117+1.7%Counted whole

8 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 Queen Anne's County is counted whole, so it has no share.

Queen Anne's County, Homes

Homes in Queen Anne's County

Queen Anne's County is a place of houses on their own lots: 82% of its 21,703 homes are detached single-family houses, against 51% across Maryland. Much of Queen Anne's County is recent building: 30% of its homes have gone up since 2000 and the middle year built is 1988, against 1979 for Maryland. Owners live in 81% of the occupied homes (Maryland: 67%), so for most households a test and a fix are their own to order.

Homes in Queen Anne's County, Maryland, 2019 to 2023
HomesQueen Anne's CountyMaryland
Housing units21,7032,545,532
Detached houses82%51%
In buildings of 5 or more7%23%
Mobile homes3%1%
Built before 196013%27%
Built since 200030%20%
Middle year built19881979
Owner-occupied81%67%

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