Storm damage in NYC: after the rain, the wind and the surge

Flood Restoration NYC is an independent referral service, not a restoration company. When you send the form, your details go to an independent local restoration provider serving New York City, who can contact you, inspect and quote any work directly. You decide whether to hire them.

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What Sandy and Ida taught New York

Two storms set the reference points. NYC Health says Superstorm Sandy in 2012 and the rain from Hurricane Ida in 2021 both broke records in the city and resulted in injury and death, but they flooded it in very different ways.

Two kinds of storm flood, from NYC Health’s data story

	Superstorm Sandy, 2012	Hurricane Ida, 2021
Where the water came from	Mostly the sea: coastal flooding and surge	The sky: about nine inches of rain, up to 3.5 inches an hour
Who was hurt	Most of 52 injury deaths on the coasts of Staten Island (44%), Queens (25%) and Brooklyn (23%)	14 deaths; 10 drowned in unregulated basement apartments
What failed	Two million homes and facilities lost power	Rain exceeded the sewers’ 1.75 inches an hour; the first-ever flash flood emergency warning for NYC

The lesson NYC Health draws is that rainfall flooding can happen anywhere in the city, not just near the water, and that low-lying areas and basement apartments are at higher risk. It also reports a 200% increase in high tide flood days from 2000 to 2021.

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Safety after the storm

Storm damage often comes with no power, and that is when people take risks. The rules are the same as after any flood:

• Generators outside only. The EPA says use them only outdoors and at least 20 feet from buildings, never in a home, garage or shed. The carbon monoxide they make could kill you in minutes.
• Power off from a dry place. The CDC says turn off the main power only if you can reach it without standing in water; otherwise call an electrician. Never switch power on or off while standing in water, and have an electrician check the system before it goes back on.
• Gas. If you smell gas or suspect a leak, the CDC says turn off the main gas valve, open all windows and leave.
• Air it out. If the home was shut up for days, the CDC advises entering briefly to open doors and windows and letting it air for at least 30 minutes.
• Stay clear of damage you cannot judge. Sagging ceilings, leaning walls, downed wires and trees on a building are for professionals and the utility.

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Three kinds of storm water in a home

Rain from above

Wind-driven rain gets in around windows, through damaged flashing and walls, and down through the top floor of a building. It shows up as wet ceilings, stained plaster and water running down the inside of walls, sometimes several floors below where it entered. The source has to be stopped before drying can work, so in an apartment building tell the owner, board or managing agent at once.

Water from the street

The Department of Environmental Protection describes street flooding as rain that pools when catch basins are blocked. It runs down basement stairs, into garages and through window wells. When rain beats the sewers’ capacity, as during Ida, it also comes up through basement drains as a sewer backup, which the sewage cleanup guide covers.

Surge from the sea

On the shore, DEP’s coastal flooding is high tide plus storm surge. Seawater floods ground floors and basements and can also push back through the sewer system. NYC Emergency Management bases its hurricane plans on six evacuation zones ranked by the risk of storm surge, with zone 1 the most likely to flood.

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Is storm water Category 3?

Restorers classify water damage with the ANSI/IICRC S500 standard. Its Category 3 examples include all forms of flooding from seawater, rising water from rivers or streams, and “wind-driven rain from hurricanes, tropical storms, or other weather-related events.” Seawater surge is among the standard’s Category 3 examples.

Rain from above is less clear-cut, and the IICRC’s 2026 position statement says so directly: “Top-down water ingress, wind-driven rain and water from weather related events are not automatically considered Category 3 Water.” The category is set by the restorer’s inspection. The standard also notes that time and temperature affect the category, so rainwater left sitting in a ceiling or carpet can get worse. A provider will likely want to know where the water came in and how long it has been there.

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What storm damage restoration involves

1. Stop more water getting in: temporary covers over broken windows and openings, and the leak traced.
2. Remove standing water with pumps or extraction. See flood water pumping.
3. Take out what cannot be dried: soaked insulation, ceiling and wall boards, carpet and pad, depending on the category.
4. Dry the structure with air movers and dehumidifiers, aiming for the EPA’s 24 to 48 hours to prevent mold.
5. Repair: new drywall, plaster, floors and finishes once the building reads dry. See flood damage repair.

The flood cleanup guide covers the middle steps in detail, including what is usually thrown away.

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What to record for insurance

With storm damage, where the water came from matters to an insurer. FloodSmart says flood insurance covers losses directly caused by flooding, and defines a flood as an excess of water on land that is normally dry, affecting two or more acres of land or two or more properties. It also says most homeowners insurance does not cover flood damage. Whether damage that does not meet that definition is covered depends on each policy’s own terms. None of this is a promise for your case: check your own policy or agent.

• Photos of the outside: broken windows, damaged walls, fallen branches, water lines on the building.
• Photos and video of every wet room before anything is moved.
• Where the water came in, as far as you can tell: from above, from the street, from the drain or from the sea.
• The date and time, and any notice you gave a landlord, board or managing agent.

The flood insurance basics page explains the general NFIP rules, including the usual 30-day wait before a new policy takes effect.

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Who to tell

Storm problems and who handles them

Problem	Who to tell
Water on the street or sidewalk, flooding manholes	311, which takes these reports for DEP
A clogged catch basin	311; DEP maintains about 150,000 of them
Leaks in a rental, co-op or condo	The landlord, board or managing agent, in writing
Wet rooms, ceilings and floors in your home	A restoration provider, after the building is safe
Your evacuation zone before the next storm	NYC Emergency Management’s Zone Finder, or 311

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Storm damage in Brooklyn, the Bronx and the rest of the city

Brooklyn takes both kinds of storm: 23% of Sandy’s injury deaths were along its coast, and its inland row houses and brownstones flood from rain and sewer backups like the rest of the city. Much of the Bronx is inland, where the risk is rain and sewer flooding. Staten Island’s coast took the heaviest toll in Sandy. Lower Manhattan is on FloodHelpNY’s list of backwater valve program areas. The borough pages for Brooklyn, the Bronx, Manhattan and Staten Island go further.

Before the next storm, look up both of your zones: the FEMA flood zone (letters) and the NYC evacuation zone (numbers). NYC Emergency Management says hurricane evacuation zones should not be confused with flood insurance risk zones. The NYC flood zones guide explains both.

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Questions people ask