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Map of Radon Zones in Maryland based on Environmental Protection Agency (EPA) data

Back to Radon Zones in the United States




Radon zones
 Zone 3 (9 counties)
 Zone 2 (9 counties)
 Zone 1 (9 counties)
  Highest Potential: counties have a predicted average indoor radon screening level greater than 4 pCi/L (pico curies per liter) (red zones)
  Moderate Potential: counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones)
  Low Potential: counties have a predicted average indoor radon screening level less than 2 pCi/L (yellow zones)
Allegany County
Radon zone : 2

Anne Arundel County
Radon zone : 2

Baltimore County
Radon zone : 1

Baltimore County
Radon zone : 1

Calvert County
Radon zone : 1

Caroline County
Radon zone : 3

Carroll County
Radon zone : 1

Cecil County
Radon zone : 2

Charles County
Radon zone : 2

Dorchester County
Radon zone : 3

Frederick County
Radon zone : 1

Garrett County
Radon zone : 2

Harford County
Radon zone : 1

Howard County
Radon zone : 1

Kent County
Radon zone : 3

Montgomery County
Radon zone : 1

Prince George's County
Radon zone : 2

Queen Anne's County
Radon zone : 3

Somerset County
Radon zone : 2

St. Mary's County
Radon zone : 3

Talbot County
Radon zone : 3

Washington County
Radon zone : 1

Wicomico County
Radon zone : 3

Worcester County
Radon zone : 3


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