Natural hazards · Grantham

Grantham, NH natural hazards

Most of the natural-hazard damage FEMA expects in Grantham comes from inland flooding, and overall the risk is high for a U.S. community. Flood insurance has paid 4 claims here since 2006. 5 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Grantham?

High

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Grantham to be higher than in 67% of U.S. communities, mostly from inland flooding.

Inland flooding81%Everything else20%

By hazard

What Grantham faces

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

Inland flooding

81% of expected damage

Well above average · higher than 86% of U.S. places

Recorded about once 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 Grantham flood?

Every paid claim on a federal flood insurance policy in Grantham, from FEMA’s records.

4paid claims since 2006

$10Kpaid to owners

0homes flooded more than once

20062026

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Sullivan County.

Disasters that hit Grantham

5 federal disasters brought FEMA money here

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

Brought FEMA money into GranthamDeclared for Sullivan County only

2013

Severe Winter Storm and Snowstorm

$6K to the Town of Grantham for repairs

2012

Hurricane Sandy

$4K to the Town of Grantham for repairs

2011

Tropical Storm Irene

$39K to the Town of Grantham for repairs

2010

Severe Winter Storm

$15K to the Town of Grantham for repairs

2005

Severe Storms and Flooding

1 household applied for aid $2K aid approved

Sullivan County has had 27 natural disasters declared since 1953, most often severe storms and floods.

Around Grantham

Grantham and the towns around it

Very lowLowModerateHighVery high

Enfieldmostly inland floodingHigh

Granthammostly inland floodingHigh

Croydonmostly inland floodingHigh

Springfieldmostly inland floodingHigh

Plainfieldmostly 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. Grantham covers 1 census tract, combined by population.

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

FEMA’s expected losses across Grantham total about $1.9M a year, counting buildings, people and crops.

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.