Natural hazards · Groton

Groton, NH natural hazards

Most of the natural-hazard damage FEMA expects in Groton comes from inland flooding, and overall the risk is very high for a U.S. community. 8 federal disasters brought FEMA money into town.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations

Expected damage

How exposed is Groton?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Groton to be higher than in 81% of U.S. communities, mostly from inland flooding.

Inland flooding85%Everything else16%

By hazard

What Groton faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Inland flooding

85% of expected damage

Well above average · higher than 94% of U.S. places

Recorded about 4 times a year in the area

Lower here

HurricanesTornadoesHailIce stormsWinter weatherCold wavesHeat wavesWildfireEarthquakesLandslidesStrong windLightningAvalanches

Not a risk here

Coastal floodingDroughtTsunamisVolcanic activity

Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.

Flood insurance claims

Does Groton flood?

FEMA's records show no paid flood insurance claims in Groton.

of homes in flood zones
are insured

of all homes
are insured

No community discount. Groton isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.

Insurance rates: Grafton County.

Disasters that hit Groton

8 federal disasters brought FEMA money here

Disasters the President declared that paid out in Groton itself: aid to households, or repair grants to the Town of Groton.

Brought FEMA money into GrotonDeclared for Grafton County only

2022

Severe Storm and Flooding

$155K to the Town of Groton for repairs

2019

Severe Storm and Flooding

$174K to the Town of Groton for repairs

2017

Severe Storms and Flooding

$424K to the Town of Groton for repairs

2011

Tropical Storm Irene

$86K to the Town of Groton for repairs

2011

Severe Storms and Flooding

$11K to the Town of Groton for repairs

2010

Severe Winter Storm

$1K to the Town of Groton for repairs

2008

Severe Storms and Flooding

$11K to the Town of Groton for repairs

1999

Tropical Storm Floyd

$11K to the Town of Groton for repairs

Grafton County has had 32 natural disasters declared since 1953, most often severe storms and floods.

Around Groton

Groton and the towns around it

Very lowLowModerateHighVery high

Grotonmostly inland floodingVery high

Dorchestermostly inland floodingVery high

Hebronmostly inland floodingVery high

Orangemostly inland floodingVery high

Canaanmostly inland floodingVery high

Rumneymostly inland floodingHigh

Plymouthmostly inland floodingHigh

About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.

Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. Groton is smaller than a census tract, so it shares the figures of the tract around its center.

Money that reached townFlood claims are matched to Groton’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Town of Groton. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau.