EPA Zone Data 2026
MA Radon Levels
View EPA radon zone classifications for every county in MA. Select your county to see detailed risk data, testing recommendations, and mitigation cost estimates.
3
Zone 1
High Risk
High Risk
10
Zone 2
Moderate
Moderate
1
Zone 3
Low Risk
Low Risk
Barnstable
Zone 2
Berkshire
Zone 2
Bristol
Zone 2
Dukes
Zone 2
Essex
Zone 1
Franklin
Zone 2
Hampden
Zone 2
Hampshire
Zone 2
Middlesex
Zone 1
Nantucket
Zone 2
Norfolk
Zone 2
Plymouth
Zone 2
Suffolk
Zone 3
Worcester
Zone 1
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