EPA radon zones
Maine radon map: every county's zone
12 of Maine's 16 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 4 are zone 2 and 0 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Androscoggin CountyZone 1
Aroostook CountyZone 1
Cumberland CountyZone 1
Franklin CountyZone 1
Hancock CountyZone 1
Kennebec CountyZone 1
Knox CountyZone 2
Lincoln CountyZone 1
Oxford CountyZone 1
Penobscot CountyZone 1
Piscataquis CountyZone 1
Sagadahoc CountyZone 2
Somerset CountyZone 1
Waldo CountyZone 2
Washington CountyZone 2
York CountyZone 1
How much does radon mitigation cost?
Most single-family systems cost $800 to $2,500 installed, depending on foundation type and how many suction points are needed. A follow-up test confirms the system works.
What do the zones mean?
EPA radon zones describe counties, not houses. Zone 1 counties have a predicted average indoor level above 4 picocuries per liter (pCi/L), Zone 2 between 2 and 4, Zone 3 below 2. Homes with high levels are found in every zone, which is why EPA recommends that every home be tested, and fixed at 4 pCi/L or above.
Source: EPA Map of Radon Zones.