1 appeal window open
Flood map changes in New Hampshire
Since November 2023, FEMA has published flood hazard notices covering 7 of New Hampshire's 10 counties.
| County | Notices | Most recent | Appeal window |
|---|---|---|---|
| Merrimack County | 3 | Aug 6, 2026 | — |
| Strafford County | 3 | Aug 6, 2026 | — |
| Sullivan County | 1 | Aug 6, 2026 | Open until Nov 4, 2026 |
| Hillsborough County | 2 | May 18, 2026 | — |
| Carroll County | 2 | Aug 20, 2025 | — |
| Belknap County | 1 | Jun 12, 2025 | — |
| Rockingham County | 1 | Nov 9, 2023 | — |
All counties in New Hampshire
What these notices mean
- Proposed
- FEMA has new draft flood maps. This starts a 90-day window when owners can appeal with technical data. It's the best time to act.
- Final
- Appeals are resolved. The new maps usually take effect about six months later, when lenders start applying the new zones.
- Map revision
- A Letter of Map Revision changes one stretch of the map, often after a levee, channel project or new survey.
Notices are organized by county and community, so a notice for your county doesn't mean your property is changing zones. What flood zones mean