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Radon Levels in Somerset County, Maryland

EPA puts Somerset County in Zone 2, its middle radon zone, and only 2 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

    0.0%

    Wicomico County

    Wicomico
    0.0%

    1 of 4 neighbours have 30+ tests, 2008 to 2017

  • Nearest county

    0.0%

    Wicomico County, 19 miles

    Wicomico
    0.0%
    Maryland
    23.9%

    Share at 4+ pCi/L, 32 tests, 2008 to 2017

  • Ground above low

    None

    64.3 pts below Maryland

    Somerset
    0.0%
    Maryland
    64.3%

    Share of land USGS rates moderate or high potential

  • Tests reported

    2

    Too few for a share

    Somerset
    2
    Needed
    30

    2008 to 2017, laboratory

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

Read a result for Somerset 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

Somerset County, At a glance

Somerset County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Somerset County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

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 Somerset County, 2008 to 2017, laboratory

CDC holds 2 reported tests for Somerset County over the 2008 to 2017 laboratory totals, with a median of 0.3 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Somerset County beside the counties around it is how this page reads it.

What these figures count

Only 2 tests were reported to CDC for Somerset 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

Somerset County, Compared

Somerset County radon figures, compared

Calculated by Radon411

CDC's largest figure for Somerset County rests on 2 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 0.5 pCi/L, with a middle value of 0.3 pCi/L.

Wicomico County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 0.0% of its tests at or above 4 pCi/L. Farther out, St. Mary's County (48 miles away) at 20.9%, Calvert County (53 miles away) at 30.2% and Queen Anne's County (67 miles away) at 16.9% have figures too. Pooled across 24 Maryland counties, 23.9% of reported tests reached that level; across every county in the country with a figure, 35.7%.

Statewide for the same period, Washington County reported the highest share (56.0%) and Wicomico County the lowest (0.0%). EPA's 1993 map puts Somerset County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 87% of the county's land low radon potential.

Maryland, the United States and the counties around Somerset County, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedian
Maryland, pooled24 counties, pooled47,94123.9%Not pooled
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled
Washington Countyhighest in the state1,25956.0%5.2 pCi/L
Baltimore citylowest in the state1,1487.9%0.8 pCi/L
Dorchester County, MDborders it616.7%1.6 pCi/L
Wicomico County, MDborders it320.0%0.9 pCi/L
Accomack County, VAborders it90.0%0.1 pCi/L
Worcester County, MDborders it70.0%0.6 pCi/L
The nearest Maryland counties to Somerset County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Wicomico County19 mi320.0%0.9 pCi/L
St. Mary's County48 mi63620.9%1.8 pCi/L
Calvert County53 mi1,20530.2%2.0 pCi/L
Queen Anne's County67 mi6516.9%1.3 pCi/L
Charles County73 mi47724.1%1.8 pCi/L
Anne Arundel County77 mi4,08817.4%1.4 pCi/L
Prince George's County77 mi1,60319.0%1.4 pCi/L
Kent County80 mi5752.6%4.4 pCi/L
Somerset County ten-year laboratory totals, against Maryland's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMaryland, pooledChange from the row before
2008 to 201720.0%0.3 pCi/L0.5 pCi/L23.9%Level
2007 to 201610.0%0.1 pCi/L0.1 pCi/L24.4%Level
2006 to 201510.0%0.1 pCi/L0.1 pCi/L24.9%Level
2005 to 201410.0%0.1 pCi/L0.1 pCi/L24.6%First on file

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

Somerset County, Geology

The ground under Somerset County

Predicted

USGS's geologic map puts all of Somerset County's mapped land in one class: low radon potential. 86.5% 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 Somerset County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Eastern ShoreQuaternary coastal sand, silt.Low786.5%

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

Somerset County beside the ground around it

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

Share of land by USGS radon potential: Somerset County, the 4 counties bordering it and Maryland
AreaEPA zoneLow potentialModerate potentialHigh potential
Somerset CountyZone 286.6%NoneNone
Worcester CountyZone 378.1%NoneNone
Wicomico CountyZone 398.3%NoneNone
Accomack County, VAZone 367.7%NoneNone
Dorchester CountyZone 391.0%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

Somerset County, Local resources

Radon testing and mitigation in Somerset County

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

What it means

Somerset County, Questions

Questions about radon in Somerset County

Are radon levels high in Somerset County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Somerset County, Maryland were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.3 pCi/L. Wicomico County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 0.0% of its tests at or above 4 pCi/L.

Which counties border Somerset County?

Somerset County borders 4 counties: Worcester County, MD, Wicomico County, MD, Accomack County, VA and Dorchester County, MD.

Products

Somerset County, Products

Testing a home in Somerset County

No CDC figure names Somerset County; the nearest county with one, Wicomico County (19 miles away), reported 0.0% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Somerset County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Somerset County homes, compared

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Somerset County, Bordering counties

Counties bordering Somerset County

Calculated by Radon411

Somerset County, Cities and towns

Cities and towns in Somerset County

The Census Bureau estimates 24,973 residents in Somerset County for July 1, 2025, 416 more than in 2020 (+1.7%). That works out to 78 people per square mile of land. No town dominates: Princess Anne, the largest, has 3,642 residents, 14.6% of the total. Together its 2 incorporated places hold 24.8% of those residents; the other 75.2% live outside any of them. Reported testing is thin here: 2 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Maryland as a whole comes to 7.7.

From Princess Anne to Crisfield, CDC publishes no figure by town: each reads Somerset County's.

The cities and towns in Somerset County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Princess Anne3,642+4.5%14.6%
Crisfield2,555+1.8%10.2%

2 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).

Somerset County, Homes

Homes in Somerset County

Of Somerset County's 10,916 homes, 69% are detached houses, against 51% across Maryland; 13% are in buildings of five or more homes. Half of its homes were built before 1984, close to Maryland's 1979: 25% date from before 1960 and 26% from 2000 or later. 69% of occupied homes are lived in by their owner (Maryland: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Somerset County, Maryland, 2019 to 2023
HomesSomerset CountyMaryland
Housing units10,9162,545,532
Detached houses69%51%
In buildings of 5 or more13%23%
Mobile homes10%1%
Built before 196025%27%
Built since 200026%20%
Middle year built19841979
Owner-occupied69%67%

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