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Natural hazards · Cohasset

Cohasset, MA natural hazards

Most of the natural-hazard damage FEMA expects in Cohasset comes from inland flooding, and overall the risk is low for a U.S. community. Flood insurance has paid 107 claims here since 1978. 12 federal disasters brought FEMA money into town.

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

How exposed is Cohasset?

31
Low
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Cohasset to be higher than in 31% of U.S. communities, mostly from inland flooding and coastal flooding.

Inland flooding50%Coastal flooding31%Hurricanes10%Everything else10%
By hazard

What Cohasset faces

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

Inland flooding

50% of expected damage
Well below average · higher than 21% of U.S. places
Recorded about 3 times a year in the area

Coastal flooding

31% of expected damage
Well above average · among the top 1% of U.S. places

Hurricanes

10% of expected damage
Well above average · higher than 79% of U.S. places
Recorded about once every 5 years in the area

Lower here

TornadoesHailIce stormsWinter weatherCold wavesHeat wavesWildfireEarthquakesLandslidesStrong windLightningDrought

Not a risk here

AvalanchesTsunamisVolcanic 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 Cohasset flood?

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

107paid claims since 1978
$1.4Mpaid to owners
10homes flooded more than once
19782026

Biggest named events

  • The “Halloween” storm: 28 claims, $631K
  • December Storm - Nor'easter: 6 claims, $69K
  • Not a named storm: 4 claims, $7K

Homes that flooded again and again

■ FEMA “severe repetitive loss” (2) ■ flooded 2+ times

of homes in flood zones
are insured
of all homes
are insured
No community discount. Cohasset isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Norfolk County.
Disasters that hit Cohasset

12 federal disasters brought FEMA money here

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

Brought FEMA money into CohassetDeclared for Norfolk County only
2022

Severe Winter Storm and Snowstorm

$70K to the Town of Cohasset for repairs
2018

Severe Winter Storm and Snowstorm

$43K to the Town of Cohasset for repairs
2018

Severe Winter Storm and Flooding

$12K to the Town of Cohasset for repairs
2015

Severe Winter Storm, Snowstorm, and Flooding

$79K to the Town of Cohasset for repairs
2013

Severe Winter Storm, Snowstorm, and Flooding

$103K to the Town of Cohasset for repairs
2011

Tropical Storm Irene

$58K to the Town of Cohasset for repairs
2011

Severe Winter Storm and Snowstorm

$27K to the Town of Cohasset for repairs
2010

Severe Storms and Flooding

12 households applied for aid $24K aid approved
2005

Record And/Or Near Record Snow

$54K to the Town of Cohasset for repairs
2004

Flooding

2 households applied for aid $3K aid approved
2003

Snow

$59K to the Town of Cohasset for repairs
2001

Snow

$26K to the Town of Cohasset for repairs
Norfolk County has had 31 natural disasters declared since 1953, most often hurricanes and winter storms.
Around Cohasset

Cohasset and the towns around it

Scituate: Low, mostly inland floodingHingham: Low, mostly inland floodingHull: Very high, mostly coastal floodingMarshfield: Moderate, mostly inland floodingNorwell: Very low, mostly inland floodingWeymouth Town: Low, mostly inland floodingQuincy: Moderate, mostly inland floodingBoston: Very low, mostly inland floodingCohasset: Low, mostly inland flooding CohassetScituateHinghamHull
Very lowLowModerateHighVery high
Hullmostly coastal floodingVery high
Scituatemostly inland floodingLow
Cohassetmostly inland floodingLow
Hinghammostly inland floodingLow
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. Cohasset covers 2 census tracts, combined by population.
Money that reached townFlood claims are matched to Cohasset’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Town of Cohasset. 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 Cohasset total about $2.8M 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.

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/15 · 2025-01-01
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