EPA radon zones
Arizona radon map: every county's zone
0 of Arizona's 15 counties are EPA radon zone 1 (predicted average above 4 pCi/L), 15 are zone 2 and 0 are zone 3. High readings occur in every zone, so EPA recommends testing every home.
Apache CountyZone 2
Cochise CountyZone 2
Coconino CountyZone 2
Gila CountyZone 2
Graham CountyZone 2
Greenlee CountyZone 2
La Paz CountyZone 2
Maricopa CountyZone 2
Mohave CountyZone 2
Navajo CountyZone 2
Pima CountyZone 2
Pinal CountyZone 2
Santa Cruz CountyZone 2
Yavapai CountyZone 2
Yuma CountyZone 2
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.
Arizona cities: water and radon
- PhoenixMaricopa County · zone 2
- TucsonPima County · zone 2
- MesaMaricopa County · zone 2
- GilbertMaricopa County · zone 2
- ChandlerMaricopa County · zone 2
- GlendaleMaricopa County · zone 2
- ScottsdaleMaricopa County · zone 2
- PeoriaMaricopa County · zone 2
- TempeMaricopa County · zone 2
- SurpriseMaricopa County · zone 2
Source: EPA Map of Radon Zones.