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Natural hazards · Denville

Denville, NJ natural hazards

Most of the natural-hazard damage FEMA expects in Denville comes from inland flooding, and overall the risk is high for a U.S. community. Flood insurance has paid 778 claims here since 1978. 14 federal disasters brought FEMA money into town.

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

How exposed is Denville?

60
High
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Denville to be higher than in 60% of U.S. communities, mostly from inland flooding.

Inland flooding79%Cold waves6%Everything else15%
By hazard

What Denville faces

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

Inland flooding

79% of expected damage
Well above average · higher than 82% of U.S. places
Recorded about 4 times a year in the area

Cold waves

6% of expected damage
Below average · higher than 29% of U.S. places
Recorded about once a year in the area

Lower here

HurricanesTornadoesHailIce stormsWinter weatherHeat 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 Denville flood?

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

778paid claims since 1978
$19.1Mpaid to owners
94homes flooded more than once
19782026

Biggest named events

  • Hurricane Irene: 239 claims, $13.7M
  • Hurricane Floyd: 96 claims, $1.2M
  • March 2010 Nor'easter: 61 claims, $719K

Homes that flooded again and again

Each house = 2 homes. ■ FEMA “severe repetitive loss” (44) ■ flooded 2+ times

of all homes
are insured
🏷️ 15% off flood insurance. Denville is in FEMA’s Community Rating System (class 7) for its flood-proofing work.
Insurance rates: Morris County.

What’s been done with FEMA grants

11flood-prone properties bought out and cleared
1homes raised above flood level
Disasters that hit Denville

14 federal disasters brought FEMA money here

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

Brought FEMA money into DenvilleDeclared for Morris County only
2021

Remnants of Hurricane Ida

56 households applied for aid $55K aid approved $50K to the Township of Denville for repairs
2021

Severe Winter Storm and Snowstorm

$108K to the Township of Denville for repairs
2020

Tropical Storm Isaias

$131K to the Township of Denville for repairs
2018

Severe Winter Storm and Snowstorm

$28K to the Township of Denville for repairs
2016

Severe Winter Storm and Snowstorm

$82K to the Township of Denville for repairs
2012

Hurricane Sandy

168 households applied for aid $13K aid approved $179K to the Township of Denville for repairs
2011

Severe Storm

$122K to the Township of Denville for repairs
2011

Hurricane Irene

486 households applied for aid $1.7M aid approved $655K to the Township of Denville for repairs
2010

Severe Winter Storm and Snowstorm

$81K to the Township of Denville for repairs
2010

Severe Storms and Flooding

23 households applied for aid $8K aid approved $19K to the Township of Denville for repairs
2007

Severe Storms and Inland and Coastal Flooding

24 households applied for aid $11K aid approved
2005

Severe Storms and Flooding

5 households applied for aid $6K aid approved
2000

Severe Storms, Flooding and Mudslides

$5K to the Township of Denville for repairs
1999

Hurricane Floyd Major Disaster Declarations

$41K to the Township of Denville for repairs
Morris County has had 26 natural disasters declared since 1953, most often severe storms and hurricanes.
Around Denville

Denville and the towns around it

Rockaway: Low, mostly inland floodingRockaway: High, mostly inland floodingBoonton: Very high, mostly inland floodingParsippany-Troy Hills: High, mostly inland floodingMorris: Low, mostly inland floodingWest Milford: High, mostly inland floodingWharton: Low, mostly inland floodingDover: Very high, mostly inland floodingRandolph: Low, mostly inland floodingJefferson: Low, mostly inland floodingKinnelon: Moderate, mostly inland floodingMontville: Very high, mostly inland floodingBoonton: Very high, mostly inland floodingMountain Lakes: Low, mostly inland floodingEast Hanover: High, mostly inland floodingMorris Plains: Low, mostly inland floodingHanover: Low, mostly inland floodingHarding: Moderate, mostly inland floodingDenville: High, mostly inland flooding DenvilleRockawayRockawayBoontonParsippany-Troy HillsMorris
Very lowLowModerateHighVery high
Boontonmostly inland floodingVery high
Rockawaymostly inland floodingHigh
Parsippany-Troy Hillsmostly inland floodingHigh
Denvillemostly inland floodingHigh
Morrismostly inland floodingLow
Rockawaymostly 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. Denville covers 3 census tracts, combined by population.
Money that reached townFlood claims are matched to Denville’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Township of Denville. 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 Denville total about $8.0M 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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