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Natural hazards · Green Brook

Green Brook, NJ natural hazards

Most of the natural-hazard damage FEMA expects in Green Brook comes from inland flooding, and overall the risk is high for a U.S. community. Flood insurance has paid 268 claims here since 1981. 9 federal disasters brought FEMA money into town.

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

How exposed is Green Brook?

78
High
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Green Brook to be higher than in 78% of U.S. communities, mostly from inland flooding.

Inland flooding87%Everything else13%
By hazard

What Green Brook faces

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

Inland flooding

87% of expected damage
Well above average · higher than 92% of U.S. places
Recorded about 6 times a year in the area

Lower here

Coastal floodingHurricanesTornadoesHailIce stormsWinter weatherCold wavesHeat wavesWildfireEarthquakesLandslidesStrong windLightning

Not a risk here

DroughtAvalanchesTsunamisVolcanic 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 Green Brook flood?

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

268paid claims since 1981
$8.6Mpaid to owners
0homes flooded more than once
19812026

Biggest named events

  • Hurricane Floyd: 49 claims, $932K
  • Hurricane Irene: 45 claims, $1.1M
  • 2025 July NYC Metro Area Flooding: 45 claims, $3.2M
of homes in flood zones
are insured
of all homes
are insured
No community discount. Green Brook isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Somerset County.

What’s been done with FEMA grants

9flood-prone properties bought out and cleared
1homes raised above flood level
Disasters that hit Green Brook

9 federal disasters brought FEMA money here

Disasters the President declared that paid out in Green Brook itself: aid to households, or repair grants to the Township of Green Brook.

Brought FEMA money into Green BrookDeclared for Somerset County only
2021

Remnants of Hurricane Ida

110 households applied for aid $522K aid approved $616K to the Township of Green Brook for repairs
2018

Severe Winter Storm and Snowstorm

$381K to the Township of Green Brook for repairs
2016

Severe Winter Storm and Snowstorm

$30K to the Township of Green Brook for repairs
2012

Hurricane Sandy

147 households applied for aid $25K aid approved $560K to the Township of Green Brook for repairs
2011

Hurricane Irene

128 households applied for aid $280K aid approved $225K to the Township of Green Brook for repairs
2010

Severe Winter Storm and Snowstorm

$17K to the Township of Green Brook for repairs
2010

Severe Storms and Flooding

19 households applied for aid $57K aid approved $240K to the Township of Green Brook for repairs
2007

Severe Storms and Inland and Coastal Flooding

6 households applied for aid $3K aid approved
1999

Hurricane Floyd Major Disaster Declarations

$72K to the Township of Green Brook for repairs
Somerset County has had 23 natural disasters declared since 1953, most often severe storms and hurricanes.
Around Green Brook

Green Brook and the towns around it

Middlesex: Very high, mostly inland floodingDunellen: Very high, mostly inland floodingWatchung: High, mostly inland floodingPlainfield: Very high, mostly inland floodingNorth Plainfield: Very high, mostly inland floodingWarren: Moderate, mostly inland floodingBridgewater: Moderate, mostly inland floodingBound Brook: Very high, mostly inland floodingPiscataway: High, mostly inland floodingSouth Bound Brook: Very high, mostly inland floodingBerkeley Heights: Moderate, mostly inland floodingScotch Plains: High, mostly inland floodingBernards: Moderate, mostly inland floodingLong Hill: High, mostly inland floodingBedminster: Moderate, mostly inland floodingBranchburg: Moderate, mostly inland floodingSomerville: High, mostly inland floodingManville: High, mostly inland floodingHillsborough: Moderate, mostly inland floodingRaritan: High, mostly inland floodingFranklin: Moderate, mostly inland floodingGreen Brook: High, mostly inland flooding Green BrookMiddlesexDunellenWatchungPlainfieldNorth PlainfieldWarrenBridgewater
Very lowLowModerateHighVery high
Middlesexmostly inland floodingVery high
Plainfieldmostly inland floodingVery high
North Plainfieldmostly inland floodingVery high
Dunellenmostly inland floodingVery high
Green Brookmostly inland floodingHigh
Watchungmostly inland floodingHigh
Bridgewatermostly inland floodingModerate
Warrenmostly inland floodingModerate
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. Green Brook covers 1 census tract, combined by population.
Money that reached townFlood claims are matched to Green Brook’s own flood-insurance community (here, the census tracts inside it); household aid to the registrant’s city; repair grants to the Township of Green Brook. 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 Green Brook total about $5.6M 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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You’re in Green Brook, NJSomerset CountyView boundary

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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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