EPA radon zones
Pennsylvania radon map: every county's zone
49 of Pennsylvania's 67 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 17 are zone 2 and 1 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Adams CountyZone 1
Allegheny CountyZone 1
Armstrong CountyZone 1
Beaver CountyZone 1
Bedford CountyZone 1
Berks CountyZone 1
Blair CountyZone 1
Bradford CountyZone 1
Bucks CountyZone 1
Butler CountyZone 1
Cambria CountyZone 2
Cameron CountyZone 1
Carbon CountyZone 1
Centre CountyZone 1
Chester CountyZone 1
Clarion CountyZone 1
Clearfield CountyZone 1
Clinton CountyZone 1
Columbia CountyZone 1
Crawford CountyZone 2
Cumberland CountyZone 1
Dauphin CountyZone 1
Delaware CountyZone 1
Elk CountyZone 2
Erie CountyZone 2
Fayette CountyZone 2
Forest CountyZone 2
Franklin CountyZone 1
Fulton CountyZone 1
Greene CountyZone 2
Huntingdon CountyZone 1
Indiana CountyZone 1
Jefferson CountyZone 2
Juniata CountyZone 1
Lackawanna CountyZone 1
Lancaster CountyZone 1
Lawrence CountyZone 2
Lebanon CountyZone 1
Lehigh CountyZone 1
Luzerne CountyZone 1
Lycoming CountyZone 1
McKean CountyZone 2
Mercer CountyZone 2
Mifflin CountyZone 1
Monroe CountyZone 1
Montgomery CountyZone 1
Montour CountyZone 1
Northampton CountyZone 1
Northumberland CountyZone 1
Perry CountyZone 1
Philadelphia CountyZone 3
Pike CountyZone 2
Potter CountyZone 2
Schuylkill CountyZone 1
Snyder CountyZone 1
Somerset CountyZone 2
Sullivan CountyZone 1
Susquehanna CountyZone 1
Tioga CountyZone 1
Union CountyZone 1
Venango CountyZone 1
Warren CountyZone 2
Washington CountyZone 2
Wayne CountyZone 2
Westmoreland CountyZone 1
Wyoming CountyZone 1
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.
Pennsylvania cities: water and radon
Source: EPA Map of Radon Zones.