Radon zones in New Hampshire
Zone 1: 1, Zone 2: 9, Zone 3: 0. A zone is an area estimate; EPA says all homes should be tested.
- Belknap County Zone 2
- Carroll County Zone 1
- Cheshire County Zone 2
- Coos County Zone 2
- Grafton County Zone 2
- Hillsborough County Zone 2
- Merrimack County Zone 2
- Rockingham County Zone 2
- Strafford County Zone 2
- Sullivan County Zone 2
County not listed? See what we left out and why. Leave your email to hear if this data changes.