Natural hazards · Clarkstown

Clarkstown, NY natural hazards

Most of the natural-hazard damage FEMA expects in Clarkstown comes from inland flooding, and overall the risk is very low for a U.S. community. Flood insurance has paid 724 claims here since 1978. 10 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Clarkstown?

Very low

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Clarkstown to be higher than in 11% of U.S. communities, mostly from inland flooding.

Inland flooding59%Hurricanes8%Cold waves8%Earthquakes7%Strong wind5%Tornadoes5%Everything else8%

By hazard

What Clarkstown faces

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

Inland flooding

59% of expected damage

Well below average · higher than 23% of U.S. places

Recorded about 3 times a year in the area

Hurricanes

8% of expected damage

Above average · higher than 71% of U.S. places

Recorded about once every 7 years in the area

Cold waves

8% of expected damage

Below average · higher than 30% of U.S. places

Recorded about once a year in the area

Earthquakes

7% of expected damage

Above average · higher than 61% of U.S. places

Strong wind

5% of expected damage

Above average · higher than 60% of U.S. places

Recorded about 5 times a year in the area

Tornadoes

5% of expected damage

Below average · higher than 39% of U.S. places

Lower here

Coastal floodingHailIce stormsWinter weatherHeat wavesWildfireLandslidesLightning

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 Clarkstown flood?

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

724paid claims since 1978

$9.7Mpaid to owners

103homes flooded more than once

19782026

Biggest named events

Hurricane Irene: 94 claims, $2.6M
Not a named storm: 82 claims, $135K
Hurricane Floyd: 67 claims, $1.1M

Homes that flooded again and again

Each house = 2 homes. ■ FEMA “severe repetitive loss” (18) ■ flooded 2+ times

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Rockland County.

Disasters that hit Clarkstown

10 federal disasters brought FEMA money here

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

Brought FEMA money into ClarkstownDeclared for Rockland County only

2023

Severe Storms and Flooding

$53K to the Town of Clarkstown for repairs

2021

Remnants of Hurricane Ida

$296K to the Town of Clarkstown for repairs

2020

Tropical Storm Isaias

$607K to the Town of Clarkstown for repairs

2012

Hurricane Sandy

$3.6M to the Town of Clarkstown for repairs

2011

Hurricane Irene

$1.5M to the Town of Clarkstown for repairs

2010

Severe Winter Storm and Snowstorm

$216K to the Town of Clarkstown for repairs

2010

Severe Storms and Flooding

$232K to the Town of Clarkstown for repairs

2007

Severe Storms and Inland and Coastal Flooding

$1.3M to the Town of Clarkstown for repairs

2003

Snow

$208K to the Town of Clarkstown for repairs

1999

Hurricane Floyd Major Disaster Declarations

$2.2M to the Town of Clarkstown for repairs

Rockland County has had 22 natural disasters declared since 1953, most often hurricanes and severe storms.

Around Clarkstown

Clarkstown and the towns around it

Very lowLowModerateHighVery high

Haverstrawmostly inland floodingModerate

Ramapomostly inland floodingLow

Croton-on-Hudsonmostly inland floodingVery low

Orangetownmostly inland floodingVery low

Clarkstownmostly inland floodingVery low

Chestnut Ridgemostly inland floodingVery low

Mount Pleasantmostly inland floodingVery low

Briarcliff Manormostly inland floodingVery low

Ossiningmostly inland floodingVery low

Nyackmostly inland floodingVery low

Upper Nyackmostly inland floodingVery low

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. Clarkstown covers 18 census tracts, combined by population.

Money that reached townFlood claims are matched to Clarkstown’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Town of Clarkstown. 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 Clarkstown total about $15.2M 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.