EPA Zone Data 2026
MD Radon Levels
View EPA radon zone classifications for every county in MD. Select your county to see detailed risk data, testing recommendations, and mitigation cost estimates.
8
Zone 1
High Risk
High Risk
8
Zone 2
Moderate
Moderate
8
Zone 3
Low Risk
Low Risk
Allegany
Zone 2
Anne Arundel
Zone 2
Baltimore
Zone 2
Baltimore
Zone 1
Calvert
Zone 1
Caroline
Zone 3
Carroll
Zone 1
Cecil
Zone 2
Charles
Zone 2
Dorchester
Zone 3
Frederick
Zone 1
Garrett
Zone 2
Harford
Zone 1
Howard
Zone 1
Kent
Zone 3
Montgomery
Zone 1
Prince George's
Zone 2
Queen Anne's
Zone 3
Somerset
Zone 3
St. Mary's
Zone 2
Talbot
Zone 3
Washington
Zone 1
Wicomico
Zone 3
Worcester
Zone 3
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