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New Hampshire Environment & Hazard Risk

0 counties rated high or very high risk. 8,253 storm events since 1996, #47 among states.

Expected yearly loss
$463M
$336 per person
Storm events since 1996
8,253
Most often thunderstorm wind
Flood insurance policies
4,490
$67.2M in claims paid
Superfund sites
22
113 toxic release facilities

Risk by county

FEMA National Risk Index rating, highest risk first

CountyOverall riskTop hazardFlood policiesFlood claims paid
Hillsborough CountyModerateIce storm751$10.44M
Rockingham CountyModerateCoastal flooding2,047$31.06M
Grafton CountyModerateLandslide330$4.72M
Merrimack CountyLowIce storm333$6.33M
Coos CountyLowAvalanche84$669K
Carroll CountyLowWinter weather272$2.8M
Strafford CountyLowIce storm198$2.3M
Cheshire CountyLowLandslide227$6.69M
Belknap CountyLowLightning156$924K
Sullivan CountyVery LowLandslide92$1.27M

Costliest hazards

Expected annual loss in New Hampshire, all counties combined

  • Hurricane$40.88M/yr
  • Earthquake$17.37M/yr
  • Tornado$17.02M/yr
  • Cold wave$16.34M/yr
  • Coastal flooding$12.14M/yr · 1 county high
  • Lightning$10.16M/yr · 3 counties high
  • Ice storm$8.82M/yr · 6 counties high
  • Strong wind$7.53M/yr · 1 county high
  • Heat wave$6.16M/yr
  • Avalanche$4.58M/yr · 1 county high

Storm events by type

Since 1996: 41 deaths, $384M in property and crop damage

  • Thunderstorm Wind2,094 · 7 deaths
  • Heavy Snow1,616 · 2 deaths
  • Hail893
  • Flood552 · 2 deaths
  • Winter Storm551 · 1 death
  • Flash Flood430 · 5 deaths
  • Strong Wind408 · 5 deaths
  • Winter Weather386 · 4 deaths
  • Drought275
  • High Wind261 · 2 deaths
  • Lightning208
  • Cold/Wind Chill171 · 2 deaths

Events per year

Storm events per year in New Hampshire

Most damaging storms

Since 2017, ranked by deaths, injuries and damage

  • Coastal Flood01/13/2024

    Coastal Rockingham

    $30M damage

    What happened

    In the Portsmouth region at the Seavey Island gauge, the tide reached 13.17 feet MLLW at 1212 pm. The storm surge was recorded at 3.33 feet. The Hampton, New Hampshire gage topped out at 14.20 feet MLLW with a storm surge of 4.20 feet. The water level at the Seavey Island and Hampton Tide gages were the highest ever recorded for their period of record. ||In Hampton, New Hampshire, flooding occurred off Ashworth Ave and Island Path. Winnacunnet Road was closed in Hampton as well as Route 101 along the Beach. Water reached a depth of up to three feet in places with water rescues required of residents. Business restaurants were flooded up to two feet deep along Route One in Portsmouth near the Sagamore Creek and Prescott Park as well as the Gardner Street area. Prescott Park was flooded one to two feet in the town. A home on Glade Path was surrounded by water in Hampton along with Brown and Highland Avenue. Great Island Common was closed in New Castle as well as the New Castle Common due to coastal flooding. Squmamscott Road was closed due to coastal flooding in the Newfield area of the Great Bay Estuary. In Seabrook, New Hampshire Route 286 was closed due to flooding. U.S....

  • Rip Current08/19/2018

    Coastal Rockingham

    2 deaths

    What happened

    A man and woman from Massachusetts died and 6 others had to be rescued when a strong rip current developed along the beach in Seabrook, New Hampshire. Both victims were administered CPR at the scene and taken to a nearby hospital. The 49-year-old man was pronounced dead shortly after arriving at the hospital. His 47-year-old wife died the following day.

  • Coastal Flood01/10/2024

    Coastal Rockingham

    $15M damage

    What happened

    An intense and rapidly deepening area of low pressure over the Great Lakes region (975 mb) combined with modestly high astronomical tides to produce the third highest storm tide ever in Portland (records 1912-present). In the Portsmouth region at the relatively new Seavey Island gauge, the tide reached 12.46 feet (MLLW) at 9:36 am. The storm surge was recorded at 3.17 feet. The Hampton tide gage amazingly remained above flood stage for over four hours (from 805 am to 1215 pm), topping out at 13.56 feet (MLLW) with a storm surge of 4.16 feet near the time of high tide. This tide gage didn't have a long period record but the water level was the highest recorded since the install in 2012. Storm to hurricane force southeasterly winds occurred along the coast with nearshore waves of 15 to 20 feet. Major flooding was recorded from Seabrook to Rye with numerous roads closed due to flooding including Rt 1A. Over wash with debris and erosion was reported along the seashore due to large waves overtopping coastal infrastructure. Major inundation of homes, especially in the back bay area of Hampton Beach was observed with hundreds of homes being cut-off and surrounded by water at the...

  • Rip Current08/25/2025

    Coastal Rockingham

    1 death, 1 injured

    What happened

    High surf and rip currents impacted the New Hampshire Seacoast all weekend long as Hurricane Erin passed well off to the east with multiple rescues being recorded. A farther and son were caught in a rip current on the evening of August 24th at Hampton Beach. There were no lifeguards on duty at the time. Emergency personal were able to rescue them from the water, but were not able to resuscitate the son.

  • Tropical Storm08/04/2020

    Northern Carroll

    1 death, $50K damage

    What happened

    Tropical Storm Isaias brought the greatest impacts to the state of New Hampshire in Carroll County. Numerous snapped and uprooted trees along with broken branches caused downed power lines throughout the county. Carroll County was the hardest hit for outages with 30% of customers losing power, the majority of power was restored within 24 hours. An enhanced region of tree damage, with estimated wind speeds of 70 mph, occurred in North Conway causing 100s of trees to fall. One large Eastern White Pine tree fell on a house, killing one person. Additional enhanced tree damage was reported in Bartlett. No flooding was reported.

  • Strong Wind48 kt wind12/01/2022

    Sullivan

    1 death, $15K damage

    What happened

    State police reported that a tree fell on a vehicle while traveling on State Rte. 11 in Sunapee New Hampshire. The collision caused a single fatality of the vehicle driver.

Hurricanes and tropical storms

Storms whose track crossed the state, newest first

Flood insurance

National Flood Insurance Program policies and claims

4,490 homes in New Hampshire have flood insurance, about 1.1% of residential buildings. In high-risk flood zones, 3,006 of 11,554 homes (26%) are insured.

Flood claims paid per year in New Hampshire
  • Hurricane Irene$3.26M · 143 claims
  • Flooding$3.06M · 442 claims
  • The "Halloween" Storm$1.82M · 239 claims
  • March 2010 Nor'easter$1.33M · 132 claims
  • December Nor'easter$1.06M · 59 claims

Drinking water

706 community water systems serve about 922,880 people

Since 2021, 125 systems reported 342 health-based violations. 15 systems had a violation of any kind still open at last report. These had the most:

  • New Hampton Village PctServes 600 · Surface water · Local government33 health violations+9 monitoring or reporting
  • Contoocook Village PctServes 1,600 · Surface water · Local government21 health violations+1 monitoring or reporting
  • Rolling RidgeServes 58 · Groundwater · Private16 health violations+5 monitoring or reporting
  • Lamington HillServes 35 · Groundwater · Private9 health violations+7 monitoring or reporting
  • Highland PlaceServes 30 · Groundwater · Private9 health violations+2 monitoring or reporting
  • Freedom Hill/Pine Ridge EstServes 370 · Groundwater · Private8 health violations+2 monitoring or reporting
  • Montrose CondosServes 210 · Groundwater · Private8 health violations
  • Village District of EidelweissServes 1,200 · Groundwater · Local government7 health violations+4 monitoring or reporting

Select a county above to see every system that serves it.

Climate in the largest cities

1991-2020 normals from the nearest NOAA weather station

CityJuly highJan lowRainSnow
Manchester81°F13°F42.5 in52.8 in
Nashua85°F14°F46.3 in-
Concord83°F13°F42.0 in67.7 in
Dover81°F15°F47.8 in-
Rochester82°F15°F41.2 in-
Keene82°F10°F46.1 in59.8 in
Portsmouth81°F16°F50.6 in65.0 in
Derry82°F15°F46.7 in75.5 in

Pollution sites

22 Superfund sites and 113 toxic release facilities

Superfund sites

All 22 in New Hampshire

Largest toxic releases

All 113 in New Hampshire

Facilities in New Hampshire reported 404,197 lbs of toxic releases in 2024, 118,756 lbs of it into the air.

Frequently asked questions

What is the biggest natural hazard in New Hampshire?
By expected annual loss, hurricane costs the most in New Hampshire ($40.88M a year), according to FEMA's National Risk Index.
How many storms hit New Hampshire each year?
NOAA recorded 8,253 storm events in New Hampshire since 1996, about 266 a year. The most common type is thunderstorm wind.
How many homes in New Hampshire have flood insurance?
4,490 residential flood insurance policies are in force in New Hampshire. Since 1978 the National Flood Insurance Program has paid $67.2M on 4,395 claims here.
How many Superfund sites are in New Hampshire?
New Hampshire has 22 Superfund sites on or deleted from EPA's National Priorities List.

Source: FEMA, NOAA, EPA · Last updated 08/01/2026 · Storm counts include events in forecast zones that touch each county. This product uses the FEMA OpenFEMA API, but is not endorsed by FEMA.