Enter any address in Nassau County, New York to see its FEMA flood zone
Flash flooding from heavy rainfall events is the most frequent type of flooding recorded in Nassau County over the past 30 years, with 169 such events documented. This was evident in incidents such as the flash flooding on January 10, 2024, when a low-pressure system brought persistent rainfall, causing localized flooding and stranding vehicles. Another example occurred on July 31, 2025, where slow-moving thunderstorms resulted in similar conditions.
Coastal flooding and storm surge have also impacted the area, with 64 coastal flood events and 3 storm surge/tide events recorded in the same period. Tropical storms have also contributed, with 6 events resulting in 3 fatalities.
Homeowners in Zone A, which has the highest number of National Flood Insurance Program claims, should pay particular attention to flood risk. Properties in Zone X and Zone X_Shaded also experience significant claims, indicating a broader risk across different flood zones.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
104 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Nassau County, New York has recorded 263 flood-related events since 1996 according to NOAA's Storm Events Database, including 169 flash floods and 21 river or area floods. The county has received 31 federal disaster declarations, 4 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1965–2023)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Storm And Flooding | Flood | Sep 28, 2023 |
| Remnants Of Hurricane Ida | Hurricane | Sep 1, 2021 |
| Hurricane Henri | Hurricane | Aug 21, 2021 |
| Tropical Storm Isaias | Hurricane | Aug 4, 2020 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Hurricane Sandy | Hurricane | Oct 27, 2012 |
| Hurricane Irene | Hurricane | Aug 26, 2011 |
| Severe Winter Storm And Snowstorm | Severe Storm | Dec 26, 2010 |
| Severe Storms And Flooding | Severe Storm | Mar 13, 2010 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jul 31, 2025 | 0.00K |
| Flash Flood | Aug 18, 2024 | 0.00K |
| Coastal Flood | Jan 13, 2024 | 0.00K |
| Coastal Flood | Jan 10, 2024 | 0.00K |
| Flash Flood | Jan 10, 2024 | 0.00K |
| Flash Flood | Jan 9, 2024 | 0.00K |
| Flash Flood | Aug 6, 2024 | 0.00K |
| Flash Flood | Sep 29, 2023 | 0.00K |
| Coastal Flood | Dec 18, 2023 | — |
| Flash Flood | Jul 21, 2022 | 0.00K |
Flash Flood — Jul 31, 2025
A slow moving frontal boundary moved over the local area triggering heavy rainfall and thunderstorms across NJ and NYC causing flash flooding across the area resulting in vehicles being stranded and multiple road closures.
Flash Flood — Aug 18, 2024
A frontal system over the area on August 18th and into the early morning hours of August 19th allowed for the development of multiple rounds of slow moving heavy thunderstorms which resulted in widespread significant to catastrophic flash flooding for portions of Southeast New York, specifically for the north shore of Long Island. Several rounds of rain moved through during the day on August 18...
Coastal Flood — Jan 13, 2024
Strong low pressure shifted northeast through the eastern Great Lakes on January 13, 2024, sending a warm front through during the morning hours, followed quickly by a cold front. Strong winds produced by this system, combined with peaking high astronomical tides associated with a recent new moon, produced widespread moderate to major coastal flooding along the entire southeast New York coastli...
Coastal Flood — Jan 10, 2024
Strong low pressure moving northeast from the Mid Atlantic region to southern New England during the night of January 9, 2024 into the early morning hours of January 10, 2024 produced high winds, which combined with high astronomical tides associated with an upcoming new moon to produce widespread moderate to major coastal flooding along the south shore of Long Island and along the Hudson River...
Flash Flood — Jan 10, 2024
A large low pressure system impacted the area late on January 9th and into the 10th with long duration persistent moderate to heavy rainfall. In addition to widespread river flooding, some localized areas of flash flooding occurred as the heaviest rainfall associated with convection moved through. Precipitable water values of 1.2-1.4 inches were record levels for early January. The anomalous mo...
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Nassau County, New York:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Nassau County, New York that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.