EPA radon zones
New Jersey radon map: every county's zone
7 of New Jersey's 21 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 11 are zone 2 and 3 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Atlantic CountyZone 3
Bergen CountyZone 2
Burlington CountyZone 2
Camden CountyZone 2
Cape May CountyZone 3
Cumberland CountyZone 2
Essex CountyZone 2
Gloucester CountyZone 2
Hudson CountyZone 2
Hunterdon CountyZone 1
Mercer CountyZone 1
Middlesex CountyZone 2
Monmouth CountyZone 1
Morris CountyZone 1
Ocean CountyZone 3
Passaic CountyZone 2
Salem CountyZone 2
Somerset CountyZone 1
Sussex CountyZone 1
Union CountyZone 2
Warren 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.
New Jersey cities: water and radon
Source: EPA Map of Radon Zones.