Pets in a Basement Apartment During a Flash Flood: The Plan Has to Be Finished Before the Rain

If you live below grade and there is water in the forecast, the plan is this: you and the animals are already upstairs before any water arrives, and nobody goes back down. Stage the carriers, leashes and a lightweight kit on an upper floor on a dry day. Decide the order you will move the animals in, so there is only one trip. If water is already entering the unit, call 911 and go up.

A below-grade home in a flash flood is not a slower version of a ground-floor flood. It is the room the water reaches first, through the same openings you would use to leave, and the time to act is measured in minutes. So this page is mostly about staging and about a few physical facts of your unit that are worth knowing on a dry afternoon.

Nothing on this page is legal advice, engineering advice, or a substitute for calling 911.

Go up before the water arrives

New York City Emergency Management’s press release of April 3, 2026 gives the clearest version for residents of that city: “If you live in a basement apartment, go to a higher floor when it rains. Do not wait for water to enter your unit.” The first half sets the trigger at rain, not at flooding. The second names the mistake, which is waiting to see. The city’s flooding hazard page says the same more softly: be prepared to move to a higher floor during heavy rain, and be prepared to evacuate if needed.

That is New York City guidance, written by that city’s emergency management office. What travels to other places is the physics, not the jurisdiction. FEMA’s own recommendation on this point is addressed to one city: its Hurricane Ida egress report says New York City should develop guidance for owners of buildings with floodprone basements, and that for one- and two-family homes the guidance should advise occupants to evacuate to safe locations when warnings are issued. That is FEMA telling New York what its guidance should say, not a rule for the rest of the country. Your own county or city emergency management office may publish something for below-grade units. Find it before hurricane or monsoon season, and ask for it by name if you cannot.

The National Weather Service’s general guidance points the same way without singling out below-grade homes: if your home is likely to flood, do not wait to be ordered to leave. In the same section it says: “If you have pets, take them with you or make arrangements to board them at a facility well away from the flooding danger.”

What a flash flood does to a below-grade home

The clock. The National Weather Service defines a flash flood as a flood caused by heavy or excessive rainfall in a short period of time, generally less than 6 hours, and says they can occur within minutes or a few hours of excessive rainfall. Its safety guidance adds: “Oftentimes flash floods can occur within minutes and sometimes without any sign of rain.” Its warning page says a flash flood can take from minutes to hours to develop and that it is even possible to experience one in areas not immediately receiving rain. Ready.gov’s flood page (last updated August 27, 2026) says floods may develop slowly or quickly, and that flash floods can come without warning.

The building. FEMA sent a Mitigation Assessment Team to New York City after the remnants of Hurricane Ida in September 2021 and published its findings as FEMA P-2333. Technical Report 2, Building Performance: Egress from Floodprone Basements (June 2023, revised May 2025), says runoff entered basements at the lowest point of entry. In multi-story buildings that was typically loading docks, exterior stairwells, access ramps, street-level windows and vents. In some one- and two-family homes it was below-grade garages once street flooding reached the crest of the driveway. In others it was down exterior basement stairs.

The report also says basement flooding may start with little warning, and that water keeps flowing in as long as the level stays high outside the building, so basements and below-grade areas may fill.

One observation here is our own reading, not a FEMA finding: a below-grade floor sits under street level, so water standing at street level is that much deeper indoors than it would be on a first floor. NYC Emergency Management’s April 2026 release makes the related point for its city: basement apartments and below-ground spaces are especially vulnerable, since they are typically the first places water enters and can fill rapidly.

The exits, and how water takes them away

FEMA’s egress report lists three ways a below-grade exit gets blocked:

• Doors that swing outward. Water pressing against the door of an exterior stairwell or driveway ramp can make it “difficult, if not impossible, to open doors that swing outward.” Water flowing through or against basement windows means “people cannot escape through windows even if the windows are large enough to climb through.”
• Windows that are too small, too high, or barred. Windows may be too small or too high above the floor to escape through, or may have security bars, which matters when water against a door prevents it from opening.
• No defined path out. Some basement areas have no direct path to the exterior and limited access to upper floors. In converted one- and two-family homes, the door at the top of the interior stairs may be locked or secured, so occupants cannot leave that way.

Technical Report 1 of the same study says the overlap plainly: during Ida the water often came in through windows and down entry stairways, and “Sometimes those windows and stairways are the only ways that people can get out of basements.”

The door problem is easy to get backwards. FEMA’s finding is about doors that swing outward, into an exterior stairwell or ramp that has filled with runoff: standing water presses the door shut against its frame. A door that swings inward has different geometry, and a different failure. No agency publishes a water depth at which a below-grade door of either swing becomes unopenable. FEMA’s qualitative finding is enough to plan on: the door can stop being an exit while the water is still shallow enough that you would have walked through it without thinking.

Walk your unit on a dry day and answer four questions in writing:

1. Which way does each exterior door swing, and does it open into a below-grade stairwell or ramp?
2. Is there a window you could actually get out of, at your size, wearing what you sleep in?
3. Does that window have bars, a grille, a screen, an air conditioner, a lock or a security film, and can you release it from the inside without a key or a tool?
4. Is there an interior stair to the floor above, and is the door at the top of it locked, blocked or controlled by someone else?

If any answer is uncomfortable, that is the pre-event fix, and it is worth more than any product on this website.

The standard your window can be measured against

The 2024 International Residential Code (IRC) covers emergency escape and rescue openings in Section R319. Basements and every sleeping room must have at least one operable opening (R319.1). The opening must be operable from the inside “without the use of keys, tools or special knowledge” (R319.1.1).

The bars provision is R319.4.4. Where bars, grilles, covers, screens or similar devices sit over an escape opening, the required net clear opening size still applies, and the devices must be releasable or removable from the inside “without the use of a key or tool” or force greater than the normal operation of the opening requires.

The sections R319.4.4 points to set these dimensions:

• Net clear opening of not less than 5.7 square feet, with an exception of 5 square feet for grade-floor openings (R319.2.1).
• Net clear opening height of at least 24 inches and width of at least 20 inches, measured with the opening in normal operation (R319.2.2).
• For an area well, a horizontal area of not less than 9 square feet with a horizontal projection and width of not less than 36 inches, and enough room for the opening to be fully opened (R319.4.1).
• Bottom of the clear opening no more than 44 inches above the floor (R319.2.3). R319.4.4 does not cross-reference this one, but in a below-grade room it often decides whether a window is an exit or a view.

The scoping matters more than the numbers. The IRC is a model code published by a private organization. It has no legal force until a state or local jurisdiction adopts it. Jurisdictions amend it, different ones use different editions, and the code that applies to an existing building is often not the current one. New York City is governed by its own set: FEMA’s egress report attributes its requirements to the NYC Building Code, Fire Code and Housing Maintenance Code. For example, FEMA’s summary notes that the NYC Building Code requires permanently affixed ladders or steps in below-grade window wells deeper than 44 inches.

So do not quote the IRC at your landlord. Call your local building department, ask which code and edition your unit is held to, and ask whether the escape opening requirements apply to it. A permit counter answers that routinely.

What the record shows about when this happens

Official counts of the Hurricane Ida deaths in New York City differ, because each source counts a different group of people:

• FEMA’s Hurricane Ida NYC MAT Fact Sheet 4: New York City reported 13 fatalities attributed to the flooding, including 11 people trapped in flooded basements.
• The New York City Department of Health and Mental Hygiene (DOHMH), in a data story published June 11, 2024: 14 people died from causes related to Ida, and 10 of them (71%) drowned in unregulated (illegal) basement apartments. The National Weather Service issued its first-ever flash flood emergency warning for New York City during the storm.

The DOHMH death-records review behind those figures (Yuan et al., Disaster Medicine and Public Health Preparedness, 2024, CC BY 4.0) reports both counts. Of the 14 Ida-related injury deaths, 13 were direct and 1 was indirect. Of the 13 direct deaths, 11 were drownings due to basement apartment flooding, 1 was a drowning outdoors after falling into a body of water, and 1 was asphyxiation from a fire started by flooding in a motor vehicle. The one indirect death “was caused by a fall that occurred while the decedent was moving a large item out of a flooded basement.”

On timing, the paper reports that most of the drowning deaths in basement apartments (8) occurred between 12 am and 3 am. The records hold time of death, “which could be when decedent was found,” and time of injury was available in only 2 of the 14 records. The paper also says the records show how quickly flooding overtook people, and that in several cases the decedents were actively trying to evacuate and could not escape.

Two cases in the paper match what FEMA’s engineers described. In one, the decedent could not open the door because of water pressure, household members could not help because the stairway exit was impassable, and the decedent was pronounced dead less than an hour later. In another, “responders had to remove metal bars from the only window to access the decedents.”

Unregulated units. In the study, 5 of the 6 basement apartments involved were unregulated according to the NYC Department of Buildings, and the paper notes estimates of at least 100,000 New Yorkers living in unregulated basements. A unit that was never reviewed for egress may lack the window size, window operability or clear path a reviewed unit would have, so the survey above matters more, not less. Going up early costs nothing and does not depend on whether your unit is legal. The part that needs arranging is the destination. Staging a carrier or kit in a neighbor’s unit or a shared hallway needs that neighbor’s agreement and has to fit what your building allows in a common corridor.

These are New York City figures from one storm, reviewed by one city’s health department. They are not a national rate. What generalizes is the mechanism: the middle of the night, an exit that stopped working, and less than an hour. After Superstorm Sandy in October 2012, DOHMH reports that at least one third of those who drowned at home (9 people) were found in the basement or lived in a basement apartment. The Ida study also notes that four people drowned in basement apartments in Seoul, South Korea, after extreme rainfall in 2022.

Why the pet plan has to be finished before the rain

Put the clock and the mechanism together. The interval in which animals can be moved is the interval before water is entering. That may be minutes, and it may fall at 2 am. Anything that uses up that interval is the enemy: finding the carrier, finding the second carrier, finding the cat, assembling a crate stored flat, locating a leash, deciding which animal goes first. Each of these can be finished on a dry Sunday and cannot reliably be finished during a flash flood.

Ready.gov’s pet page (last updated March 20, 2026) gives the structure without mentioning basements: “Have two kits, one larger kit if you are sheltering in place and one lightweight version for if you need to evacuate.” For a below-grade household that split has a physical meaning. The lightweight kit is the one that lives upstairs, not a smaller copy of the same bag in the same closet.

Staging: the carrier lives upstairs

This is our own recommendation for below-grade units. No agency source on this page publishes a staging rule for below-grade pet households. It rests on FEMA’s finding that water often comes in through the same windows and stairways that are sometimes the only way out: anything you would need to carry out is stored in the room that fails first, unless you move it.

• The evacuation carrier for each animal lives above grade, at the top of the interior stairs, or just inside the door you would leave by. Ready.gov’s kit list calls for a “Traveling bag, crate or sturdy carrier, ideally one for each pet.” That last phrase matters in a one-trip scenario.
• The carrier is assembled, latch-checked and lined, not flat-packed. A hard carrier stored in two halves is a five-minute task at the worst moment.
• The animal already likes it. Ready.gov advises leaving the carrier out in places your pet frequently visits, leaving it open, feeding treats near and inside it, and adding a favorite blanket or small bed so it smells familiar. Do that upstairs (in the neighbor’s hallway, if that is where it lives and the neighbor and building rules allow) so the destination is familiar too.
• A spare leash and a slip lead hang by the upstairs door, not on a hook in the below-grade unit.
• A backup collar and ID tag ride in the upstairs kit. Ready.gov’s kit list includes a collar with ID tag and a harness or leash, plus a backup leash, collar and ID tag.

If the carrier truly cannot live upstairs, the next best place is the highest shelf in the unit closest to your exit. That is a compromise, not a plan.

Our carrier backpack versus sling comparison covers which format keeps your hands free on stairs. For a cat that hides, see getting a hiding or scared cat into a carrier. Nothing here replaces having practiced it.

Know where each animal hides

Ready.gov’s pet page says: “Make note of where your pets hide, so you can easily find them in case you have to leave your house quickly.” In a below-grade unit, do the survey with a flood in mind:

• Under the bed and behind the couch are floor-level. They are the first places to become unusable and the first places a frightened animal goes.
• Inside a box spring, behind a washer or dryer, inside a cabinet toe-kick. All floor-level, hard to reach quickly, and worse in the dark.
• On top of the wardrobe or the fridge. A cat that goes up is easier to reach than one that goes under, but may be harder to persuade down.

Write the list down and keep it with the upstairs kit, so it is legible to anyone who might move the animals for you. Ready.gov also says: “Always bring pets indoors at the first sign or warning of a storm or disaster.” In a below-grade household, extend that one floor: at the first sign, the animals come indoors and then upstairs.

The safe-room advice that points the wrong way

The ASPCA’s disaster preparedness page tells owners to work out safe havens in advance, described as rooms free of hazards such as windows and flying debris, and advises: “Choose easy-to-clean areas such as utility rooms, bathrooms and basements as safe zones”. That bullet is written around windows and flying debris, the wind case, and for wind it is reasonable.

The ASPCA gives the flood instruction a few lines later, and it points the other way: in a flood, get to the highest location in the home, or a room with counters or high shelves the animals can get onto. Our flood pet preparedness guide carries that instruction in full. If your written household plan names a basement as the pet safe zone, write the hazard beside it, so the plan says which room for wind and which direction for water.

One trip, decided in advance

Here is our position: plan for a single trip up the stairs, and decide the loading order on a dry day. A decision made under time pressure, in the dark, tends to become a second trip, and the second trip is the one this page exists to prevent. Write the order down. One workable order:

1. Yourself, and any person who needs help. A person who does not get out helps nobody.
2. The animal that takes longest to catch, usually the cat, goes into its carrier first, because that step is the most likely to overrun.
3. The animal that walks on a leash goes on the leash and comes with you.
4. The lightweight kit, if it is not already upstairs. If you staged it correctly, it is.

If you cannot carry every animal in one trip, the answer is not a faster second trip. It is a second person, arranged in advance. Ready.gov advises a buddy system: plan with neighbors, friends or relatives so someone can care for or evacuate your pets if you cannot. NYC Emergency Management’s April 2026 guidance names the below-grade version: speak with neighbors on higher floors ahead of time so you have a safe place to go.

Our apartment building pet buddy system page covers how to set that up, including who holds keys and what a workable written arrangement contains. Our multi-pet go-bag math page covers what a single-trip load weighs, which is usually more than people expect.

Animals you cannot carry up a flight of stairs

A page that only talks about cats and dogs abandons the reader with a 40-gallon tank, a large reptile enclosure or a coop. Split the problem into the animal and the habitat. The habitat is generally not going anywhere in a flash flood, and pretending otherwise leads to the second trip.

For an animal in a fixed enclosure below grade, the portable container lives upstairs, not next to the tank: the transport tub with a latching lid, the net, the towel, the pillowcase or the travel carrier, whichever the species needs. The thing you would move the animal into should not be stored in the room that floods.

For a habitat that cannot be evacuated, we will not make the decision for you. Make it now, in writing, rather than at 2 am on the stairs. Our aquarium and reptile power outage guide covers the equipment side of moving those animals, and transporting fish during a hurricane evacuation covers the container problem. For backyard poultry at or below grade, see backyard chicken emergency evacuation. Catching birds is slow, so the timing lesson applies doubly.

Alerts, because the deaths cluster in the middle of the night

In the NYC review, most of the drowning deaths in basement apartments (8) were recorded between 12 am and 3 am, with the time-of-death caveat above. The authors drew the operational conclusion themselves: early weather and basement-specific warnings in multiple languages, and basement flood alarms, for residents who are sleeping or have not yet noticed signs of flooding.

Turn on the alert that will wake you. NYC Emergency Management publishes phone steps for its residents. On iPhone: Settings, Notifications, Government Alerts, then turn on Emergency Alerts and Severe Alerts. On Android: Settings, Safety and Emergency or Notifications and Advanced Settings, Wireless Emergency Alerts, turn on Allow alerts, and make sure Extreme threats and Severe threats are enabled. Menus differ by phone, so confirm the setting exists on yours. Whether your area sends a below-grade-specific alert is a local question. New York City runs a Notify NYC Basement Alert Group; ask your own emergency management office whether an equivalent exists.

Consider a water sensor. NYC Emergency Management’s preparedness list includes: “Install a water sensor or flood alarm in your basement or ground floor.” FEMA’s egress report recommends the building-scale version, water sensors integrated with sump pump systems, with backup battery power and annual testing, for owners to consider. A device that wakes you at 1 am is the difference between the interval described on this page and no interval at all.

Keep the phone charged and audible where you sleep. The NYC April 2026 release says monitoring alerts, especially overnight, and keeping phones nearby with alerts on and volume up can help people act early.

The second trip

The argument is one sentence: once water is entering, there is no second trip, for any animal or any object. That is this site’s instruction. Here is what it rests on.

• FEMA’s egress findings say the door may already be unopenable and the window unusable while the water is still shallow. FEMA’s summary to occupants warns: “Building occupants, especially those who live in basements, must not assume that measures to keep water out mean the buildings are safe when flooding occurs.”
• NYC Emergency Management says: “No one should ever walk or drive through flooded streets, stairwells, subway stations, or underpasses.” In our reading, an exterior basement stairway is a stairwell, and it is the descent a second trip requires.
• FEMA’s Fact Sheet 1 says: “Flooded basements can trap, drown, and electrocute people, and damage buildings and their contents.” It also asks owners whether basement occupants know to heed storm warnings, watch for water coming in, and leave immediately.
• The NYC death-records review records one indirect death, from a fall while moving a large item out of a flooded basement. Neither the FEMA reports nor the NYC review documents a death of someone going back for an animal.

The instruction is not that your animals do not matter. It is that the moment you can act for them is before, and a person who drowns on a staircase has not helped an animal. Staging carriers upstairs, catching the slow animal first and arranging a second pair of hands exist so that you never have to follow this instruction.

If the water is already in

Call 911. Then follow the published instructions, which are short. Ready.gov’s flood page (last updated August 27, 2026) says: “Find safe shelter right away.” “Move to higher ground or a higher floor.” If trapped in a building, get to the highest level. It says to get on the roof only if necessary and signal for help there, and adds: “Do not climb into a closed attic to avoid getting trapped by rising floodwater.”

The National Weather Service adds the hazard below-grade rooms concentrate: “Don’t go into a basement, or any room, if water covers the electrical outlets or if cords are submerged.” It also says: “Avoid flood waters at all costs and evacuate immediately when water starts to rise.” Ready.gov’s flood page says failing to evacuate flooded areas or entering flood waters can lead to injury or death.

If the animals are with you, they come up with you. If they are not, this page has already said what it will say about going back. If you are ever trapped in a vehicle rather than a building, that is a different sequence; our floodwater car escape with a dog page covers it.

After you are upstairs

Getting to a higher floor is the safety step, not the destination. You will soon need a place that takes you and the animals, and that goes better if it was decided in advance.

• The neighbor upstairs is a landing, not a plan. It buys you the flood, not the week after. NYC Emergency Management frames the arrangement as planning ahead with neighbors for a safe place to go during possible flooding.
• Leaving the building. NYC Emergency Management says that if it is safe to evacuate, leave and take your Go Bag. The National Weather Service says you may be evacuated, so pack in advance and do not wait until the last moment to gather essentials for yourself, your family or your pets.
• Lodging. Ready.gov says: “Many public shelters and hotels do not allow pets inside.” It advises knowing a safe place to take your pets before disasters happen. Our pet-friendly hotel evacuation checklist is the last-minute booking playbook, including the weight and count rules that turn people away at the desk.
• Boarding. If the animal is going somewhere you are not, our emergency pet boarding checklist covers what a facility asks for at intake, and board or evacuate together covers when boarding is a legitimate branch.
• Flying out. Carrier eligibility is decided by published airline size limits, not by what fits in your car. Our airline-approved pet carriers guide has the comparison. Worth knowing before you buy the carrier that will live upstairs.
• Documents. A below-grade unit is a bad place to keep the only copy of anything. Our pet emergency wallet card tool prints a fill-in card, and our pet travel document organizer covers what a boarding facility or receiving vet asks for.
• Rescue stickers. The ASPCA recommends a rescue alert sticker where responders will see it, listing the types and number of pets inside and your veterinarian’s contact information, and says that if you must evacuate with your pets and time allows, you write EVACUATED across the stickers. For a unit with its own street entrance, the sticker belongs at that entrance. Our letting firefighters know pets are inside page covers placement and limits, and our pet rescue alert sticker tool prints one.

The fixes, sorted by who controls them

Yours, as an occupant, whatever your lease says:

• Where the carriers, leashes and lightweight kit are stored. This is the single highest-value change on this page.
• Whether you have practiced getting each animal into its carrier.
• Whether you know where each animal hides.
• Whether phone alerts are on and audible overnight.
• Whether a neighbor on a higher floor has agreed in advance and knows how many animals are coming.
• Whether the path from your bed to your exit is clear. The NYC review describes one Ida case in which “the only door was blocked by household items.”
• Whether you keep a plug-in or battery water alarm on the floor.

The owner’s, or shared:

• Window size, operability and sill height, and whether bars or grilles release from the inside.
• Which way exterior doors swing, and whether the door at the top of an interior stair is locked or secured against you.
• Permanently affixed ladders or steps in a deep window well, where the code your jurisdiction has adopted calls for them.
• Structural or drainage work. FEMA’s Ida reports recommend that owners evaluate mitigation options, and its recommendation to modify outward-swinging doors with lightly attached blow-out panels is directed at owners working with design professionals, not tenants with a utility knife. Do not improvise on a door.

If you rent, put the request in writing, keep a copy, and ask your local building department what applies. Our pet emergency kit for renters page covers where a renter can store a kit and what a flood policy does and does not reach in a below-grade space.

After the water goes down

Do not rush the pump. NYC Emergency Management says pumping flood water out of a building too quickly could cause serious structural damage, and that “The water must be drained slowly to equalize pressure on both sides of building walls.” FEMA’s basement building performance report describes the failure this protects against: a Queens home whose unreinforced masonry basement wall collapsed under lateral soil pressure plus increased hydrostatic pressure on the exterior of the wall caused by the surface flooding.

Keep the animals out until it is cleaned. NYC Emergency Management says: “Keep children, pets and people with compromised immune systems away until the area has been cleaned and disinfected.” Ready.gov’s after-a-flood guidance adds the electrical and mold hazards and a line pet owners should read twice: “Be aware that snakes and other animals may be in your house.”

Our flood pet preparedness guide covers floodwater contamination and rinsing an animal that contacted it, and returning home with pets after a disaster covers re-entry. Neither is below-grade-specific, and both apply.

What the sources do not cover

• No source cited here addresses pets in below-grade homes specifically. FEMA’s four Ida documents describe below-grade risk to people and do not mention animals. Ready.gov’s pets page does not mention basements. The one crossover, the ASPCA safe-room advice, points the wrong way for floods. The carrier-upstairs rule and the one-trip rule are this site’s reasoning from these sources.
• No agency publishes a water depth at which a below-grade door becomes unopenable. FEMA states the qualitative finding, and one case in the NYC study describes a decedent who could not open a door because of water pressure.
• The figures are local. The Ida and Sandy death figures are New York City figures from one storm each, and the egress requirements FEMA summarizes are New York City requirements. The IRC sections bind nobody until a jurisdiction adopts them. Your building department is the authority on your unit, and your emergency management office is the authority on what your area publishes for below-grade residents.

If you take one thing from this page, take the storage change. The carrier that lives upstairs is the difference between the night where everyone is on a higher floor at the first warning, and the night where somebody goes back down.