Nassau County, New York: hazard history

FEMA declared 31 disasters that named Nassau County between 1965 and 2023.

Most recent declarations

• DR-4755 2023 · Flood · Severe Storm And Flooding
• EM-3572 2021 · Hurricane · Remnants Of Hurricane Ida
• DR-4615 2021 · Hurricane · Remnants Of Hurricane Ida
• EM-3565 2021 · Hurricane · Hurricane Henri
• DR-4567 2020 · Hurricane · Tropical Storm Isaias
• DR-4480 2020 · Biological · Covid-19 Pandemic
• EM-3434 2020 · Biological · Covid-19
• DR-4085 2012 · Hurricane · Hurricane Sandy
• EM-3351 2012 · Hurricane · Hurricane Sandy
• DR-4020 2011 · Hurricane · Hurricane Irene

Not counted above: 9 statewide declarations, which covered every county in New York. A declaration is a decision to send federal help, not a measure of how bad an event was. Records run from 1953. Source: FEMA OpenFEMA Disaster Declarations Summaries.

Records start in 1996. Damage is NOAA's estimate at the time, in nominal dollars, and is often rounded; it is not insurance claims data. A storm that crossed two NOAA zones in this county is recorded, and counted, once per zone.

NOAA storm event records in Nassau County each year. The busiest year was 2010, with 71 records.

Years with no record are left out of the table, not shown as zero.

Costliest records

1. Flash Flood · Oct 14, 2005$11.0M
   NOAA name: NASSAU · NOAA record 5481958
2. Flash Flood · Sep 1, 2021$8.0M
   NOAA name: NASSAU · NOAA record 995038
3. Coastal Flood · Oct 19, 1996$3.0M
   NOAA name: NASSAU · NOAA record 5583768
4. Thunderstorm Wind · Sep 7, 1998$2.5M
   NOAA name: NASSAU · NOAA record 5669623
5. Tornado · Sep 7, 1998$1.0M
   NOAA name: NASSAU · 6 injuries · NOAA record 5669683

Deadliest records

1. High Wind · Oct 29, 20126 deaths
   NOAA name: SOUTHERN NASSAU · $1.0M damage · NOAA record 415926
2. High Surf · Jun 15, 20024 deaths
   NOAA name: NASSAU · NOAA record 5309739
3. High Wind · Oct 29, 20124 deaths
   NOAA name: NORTHERN NASSAU · $1.0M damage · NOAA record 415925
4. Blizzard · Feb 23, 20263 deaths
   NOAA name: NORTHERN NASSAU · NOAA record 1310157
5. High Surf · Oct 1, 20012 deaths
   NOAA name: NASSAU · NOAA record 5270528

Each line is one NOAA record, linked to its page at NOAA. One large storm can appear more than once if NOAA recorded it in several zones of this county. Dollars are nominal.

The National Flood Insurance Program paid $2.3B on 51,448 claims in Nassau County from 1978 to 2024.

A count of claims, not a rate: NFIP publishes no count of insured homes beside it, and most flood damage is uninsured. Nominal dollars. Records run from 1978 to 2024; claims filed without a county code are not on any county page. Source: FEMA OpenFEMA FIMA NFIP Redacted Claims.

A hazard vulnerability analysis rates each hazard for probability, impact, preparedness and response. Probability is the one column the county’s federal record can fill — NCEI storm events from 1996 to 2026 and FEMA declarations naming the county — and this is what it says for a facility here, on the 0–3 scale of the all-hazards structure surveyors expect. The other six columns are the facility’s own judgment about its building, and Calchis leaves them blank.

A dash means the record does not speak to that hazard; it is not a zero. Whether a finished document satisfies the CMS Emergency Preparedness Rule is the facility’s finding and its surveyor’s. Complete the HVA for a facility in Nassau County — the technological, human and hazardous-materials rows, the six facility columns, the approval and the printed document — or read the sample analysis on that page first.

• Every figure is counted from public federal records held by Calchis: NOAA NCEI Storm Events, FEMA OpenFEMA Disaster Declarations, and FEMA NFIP claims. Nothing is modeled or estimated.
• NOAA files some events by county and others by forecast zone, and names both. Records are counted as Nassau County when their NOAA name is this county's name, alone or with a word like “Coastal” or “Inland” in front. The county codes NOAA also publishes have not been loaded for New York yet; when they are, this page will count by code instead, and some counties' records will grow. NOAA names counted here: NASSAU, NORTHERN NASSAU, SOUTHERN NASSAU. Zones named for something else, such as a mountain range or two counties at once, are left out: 0% of New York's NOAA records.
• Counts last rebuilt from the source records on Sep 15, 2026.