Radon zones in New Hampshire
| Belknap County | New Hampshire | 2 |
| Carroll County | New Hampshire | 1 |
| Cheshire County | New Hampshire | 2 |
| Coos County | New Hampshire | 2 |
| Grafton County | New Hampshire | 2 |
| Hillsborough County | New Hampshire | 2 |
| Merrimack County | New Hampshire | 2 |
| Rockingham County | New Hampshire | 2 |
| Strafford County | New Hampshire | 2 |
| Sullivan County | New Hampshire | 2 |
Sources
- New Hampshire: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- New Hampshire: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- New Hampshire: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- New Hampshire: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- New Hampshire: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- New Hampshire: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
- EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
"Secondary" marks a source used only because the official page could not be read.