Enter any address in Portsmouth, New Hampshire to see its FEMA flood zone
Portsmouth has a population of 21,956 residents. Like many communities in New Hampshire, properties in Portsmouth may be located in various FEMA flood zones ranging from high-risk Special Flood Hazard Areas to low-risk zones.
Use the address lookup above to check the specific flood zone for any property in Portsmouth. Results come directly from FEMA's National Flood Hazard Layer (NFHL).
Statewide data from OpenFEMA. City-level breakdowns coming soon.
FEMA assigns flood zone designations to areas in Portsmouth, New Hampshire:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Portsmouth that are in FEMA Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
The average NFIP premium in New Hampshire is approximately $1,174 per year.
Even in low-risk zones, flood insurance is recommended — over 20% of NFIP claims come from outside high-risk areas. Visit FloodSmart.gov for quotes.