On FEMA’s figures, Old Brookville faces less hazard damage per building than 91% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Old Brookville gets an A for hazard risk: lower expected damage per building than 91% of U.S. towns. Most of that expected damage is river and rain flooding (74%), then hurricanes (13%). FEMA’s files show no paid flood insurance claims here.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What Old Brookville faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
River and rain flooding
Hurricanes
Earthquakes
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
What’s behind Old Brookville’s grade
River and rain flooding is 74% of the building damage FEMA expects in Old Brookville, and Old Brookville’s rate of river and rain flooding damage is lower than 79% of U.S. census tracts. Next is hurricanes at 13% (higher than 79% of U.S. census tracts).
A lower expected damage per building than 91% of U.S. towns (21,298).
All of Old Brookville’s residents live in one census tract; the figures are that tract’s.
In dollars, FEMA expects about $825K a year in losses across Old Brookville: $769K to buildings, the rest to people and crops.
Does Old Brookville flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Old Brookville. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Old Brookville 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.1 federal disaster brought FEMA money to Old Brookville
Disasters that paid out in Old Brookville itself (aid to households or repair grants to the Village of Old Brookville), newest first, with that year’s flood claims.
- 2021Remnants of Hurricane Ida1 households applied for aid$7K aid approved
Nassau County has had 22 natural disasters declared by the President since 1953, most often hurricanes and tropical storms, then severe storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees; the 2001 World Trade Center declarations.
Old photos of Old Brookville after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Old Brookville archive →Old Brookville and its neighbors
Old Brookville is 3rd of the 4 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Brookville | A+among the lowest damage | river and rain flooding | 4 |
| Upper Brookville | Aless damage than 91% | river and rain flooding | — |
| Old Brookville | Aless damage than 91% | river and rain flooding | 0 |
| Roslyn Harbor | Aless damage than 91% | river and rain flooding | 17 |
| Glen Head | — | a Census area inside a town; graded with the town | |
| Greenvale | — | a Census area inside a town; graded with the town | |
| Glenwood Landing | — | a Census area inside a town; graded with the town | |
| Matinecock | — | 867 residents; we grade 1,000+ | |
Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.
Get ready for what Old Brookville faces
A short kit for the hazards that drive the building damage here, 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.
Questions about natural hazards in Old Brookville
Is Old Brookville at risk for natural disasters?
On FEMA’s National Risk Index, Old Brookville has lower expected damage per building than 91% of U.S. towns: A for hazard risk. Most of the expected damage is river and rain flooding (74%) and hurricanes (13%). The figures are for the one census tract the town shares with its neighbors. This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Old Brookville in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Nassau County, 76% of homes in mapped flood zones carry federal flood insurance, and 9.6% of all homes do.
How much is flood insurance in Old Brookville?
FEMA’s Community Rating System list shows no discount for Old Brookville’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Old Brookville?
By FEMA money that reached Old Brookville, Remnants of Hurricane Ida (2021): 1 households applied for aid, $7K approved.
Is Old Brookville at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (74%), and Old Brookville’s rate for it is lower than 79% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Old Brookville.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Old Brookville’s residents lived in the 2020 census; 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. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.