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Natural hazards · Mendham

Mendham, NJ natural hazards

Most of the natural-hazard damage FEMA expects in Mendham comes from inland flooding, and overall the risk is moderate for a U.S. community. Flood insurance has paid 22 claims here since 1984. 11 federal disasters brought FEMA money into town.

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

How exposed is Mendham?

52
Moderate
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Mendham to be higher than in 52% of U.S. communities, mostly from inland flooding.

Inland flooding82%Everything else18%
By hazard

What Mendham faces

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

Inland flooding

82% of expected damage
Well above average · higher than 77% of U.S. places
Recorded about 4 times a year in the area

Lower here

HurricanesTornadoesHailIce stormsWinter weatherCold wavesHeat wavesWildfireEarthquakesLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic 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 Mendham flood?

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

22paid claims since 1984
$181Kpaid to owners
2homes flooded more than once
19842026

Biggest named events

  • Hurricane Floyd: 5 claims, $23K
  • Hurricane Irene: 2 claims, $16K
  • Hurricane Ida: 1 claim, $2K

Homes that flooded again and again

■ FEMA “severe repetitive loss” (0) ■ flooded 2+ times

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

11 federal disasters brought FEMA money here

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

Brought FEMA money into MendhamDeclared for Morris County only
2021

Remnants of Hurricane Ida

$67K to the Township of Mendham for repairs
2021

Severe Winter Storm and Snowstorm

$76K to the Township of Mendham for repairs
2020

Tropical Storm Isaias

$168K to the Township of Mendham for repairs
2018

Severe Winter Storm and Snowstorm

$248K to the Township of Mendham for repairs
2016

Severe Winter Storm and Snowstorm

$51K to the Township of Mendham for repairs
2012

Hurricane Sandy

$359K to the Township of Mendham for repairs
2011

Severe Storm

$235K to the Township of Mendham for repairs
2011

Hurricane Irene

$147K to the Township of Mendham for repairs
2010

Severe Winter Storm and Snowstorm

$20K to the Township of Mendham for repairs
2010

Severe Storms and Flooding

$63K to the Township of Mendham for repairs
1999

Hurricane Floyd Major Disaster Declarations

$26K to the Township of Mendham for repairs
Morris County has had 26 natural disasters declared since 1953, most often severe storms and hurricanes.
Around Mendham

Mendham and the towns around it

Chester: Moderate, mostly inland floodingMendham: Low, mostly inland floodingBernardsville: Low, mostly inland floodingRandolph: Low, mostly inland floodingWashington: Low, mostly inland floodingMount Olive: Low, mostly inland floodingBedminster: Moderate, mostly inland floodingTewksbury: Moderate, mostly inland floodingRoxbury: Low, mostly inland floodingBernards: Moderate, mostly inland floodingPeapack and Gladstone: High, mostly inland floodingHarding: Moderate, mostly inland floodingFar Hills: High, mostly inland floodingMine Hill: Low, mostly inland floodingVictory Gardens: Very low, mostly inland floodingRockaway: Low, mostly inland floodingDover: Very high, mostly inland floodingMendham: Moderate, mostly inland flooding MendhamChesterMendhamBernardsvilleRandolph
Very lowLowModerateHighVery high
Mendhammostly inland floodingModerate
Chestermostly inland floodingModerate
Bernardsvillemostly inland floodingLow
Mendhammostly inland floodingLow
Randolphmostly 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. Mendham covers 1 census tract, combined by population.
Money that reached townFlood claims are matched to Mendham’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Township of Mendham. 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 Mendham total about $3.6M 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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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/15 · 2025-01-01
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