Greenvale is calmer than 94% of U.S. communities
Most of the natural-hazard damage FEMA expects in Greenvale comes from inland flooding, and overall the risk is very low for a U.S. community.
What stands out about Greenvale’s weather risks
Read from FEMA’s records below. The page puts what stands out first.
How exposed is Greenvale?
FEMA expects yearly storm and flood damage to homes and buildings here to be higher than in 6% of U.S. communities, mostly from inland flooding.
Calmer than 1,449 of the 1,524 New York towns we cover.
Greenvale is smaller than a census tract, so it shares the figures of the tract around its center.
Greenvale and its neighbors
Greenvale has the lowest rating of the 6 towns around it. Tap a town to see its hazards.
| Town | Rating | Mostly | Flood claims |
|---|---|---|---|
| Oyster Bay | Very low | inland flooding | 4,654 |
| Roslyn Harbor | Very low | inland flooding | 17 |
| Old Brookville | Very low | inland flooding | 0 |
| North Hempstead | Very low | inland flooding | 189 |
| East Hills | Very low | inland flooding | 14 |
| Greenvale | Very low | inland flooding | 0 |
Rating = expected yearly storm and flood damage as a share of what’s there, vs. U.S. communities. Flood claims = paid federal flood insurance claims on record.
Does Greenvale flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Greenvale. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Greenvale isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Nassau County.What Greenvale faces
Each hazard’s share of the damage FEMA expects here, and how it compares with the rest of the country.
Inland flooding
Hurricanes
Earthquakes
Federal disasters declared here
None of the disasters declared for Nassau County shows FEMA aid or repair money reaching Greenvale itself in FEMA’s records.
Nassau County has had 24 natural disasters declared since 1953, most often hurricanes and severe storms.
Get ready for what Greenvale actually faces
A short kit for its top hazards, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- The season runs June through November and peaks from mid-August to mid-October.
- Bring in porch furniture and anything the wind can throw.
- Fill the gas tank and charge phones before the storm arrives.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Most disasters here begin in August–October
The month each of Nassau County’s 24 declared disasters began, since 1953.
What these numbers can and can’t tell you
- An average, not a forecast. FEMA’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 there, so a big city isn’t rated riskier just for having more buildings.
- Money that reached town. Flood claims are matched to Greenvale’s own flood-insurance community; household aid to the registrant’s city; repair grants to Greenvale.
- It follows property value. FEMA’s model weighs damage to buildings, so a place that recently lost many homes can rate lower than it feels.
Storm stories
Memories, warnings and help from neighbors in Greenvale.
Your answer becomes a post in Town Square.
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. Weather alerts: National Weather Service. Preparedness tips: Ready.gov. An average of past damage, not a forecast.