In a city as large and densely populated as New York, urban flooding is a complex and frustrating issue for individuals and communities. It involves water management, city policy, housing law, insurance, building design, green infrastructure and more.
On July 24, 2026, Mayor Zohran Mamdani announced a $43 million investment to expand the citywide Bureau of Coastal Resilience, which oversees major flood-protection projects, including the East Side Coastal Resiliency system on the Lower East Side. While the investment is significant, large infrastructure improvements can take years to complete and cannot address every immediate need faced by residents.
Documented spoke with Nick Nyhan of The City Sponge, who has experienced repeated flooding and helped neighbors recover, to share practical advice for people whose homes have been affected.
Nyhan explained that flooding is often a recurring problem. If your home has flooded once, it may happen again, and nearby residents may face the same risk. Many New York City neighborhoods, Nyhan points out, including Southeast Queens, Greenpoint, Elmhurst and Kensington, are especially vulnerable due to low-lying terrain, aging or inadequate drainage infrastructure and heavy rainfall that can overwhelm local systems.
If you are a renter whose home has been affected by flooding, here is a checklist of steps and resources to consider during the first 24 hours.
Is it safe to return to my apartment after a flood?
New York City Emergency management recommends not to return to a damaged building until officials or qualified professionals have confirmed that it is safe. To make sure you can return:
- Look for signs of structural damage, gas leaks, exposed electrical wiring or live wires.
- If you smell gas, leave immediately and call 911 from a safe location.
- Do not enter standing water near electrical equipment or attempt to restore electricity yourself.
- Power should remain off until a licensed electrician confirms that the electrical system is safe.
- Flooded areas should be ventilated, and exterior gas lines should be shut off only when it can be done safely.
How do I document flood damage?
Before cleaning or throwing anything away:
- Take wide photographs and videos of every affected room.
- Photograph the highest point reached by the water.
- Record damage to walls, floors, appliances, furniture and personal belongings.
- Photograph sewage, mold, blocked drains or other unsafe living conditions.
- Make a written list of damaged items, including their approximate value, serial numbers from electronics and purchase date.
- Keep receipts for hotels, transportation, food, cleaning supplies, repairs and replacement items.
- Save damaged items when it is safe to do so. When contaminated items must be discarded, photograph them first.
- Save copies of all messages exchanged with your landlord, insurance company and government agencies.
These records may support an insurance claim, a landlord complaint or an application for future disaster assistance.
What do I do after flooding?
According to NYC Housing Preservation and Development, after flooding you should:
- Contact your landlord, who is responsible for addressing flood damage under the Housing Maintenance Code. Call 311 to report damage if your landlord does not respond.
- If the floodwater contained sewage, avoid direct contact and disinfect affected surfaces with a diluted bleach solution.
- Clean and dry affected areas and belongings as quickly and thoroughly as possible to prevent mold.
- If water reaches electrical or heating equipment, notify your landlord. Call 311 or 911 if unsafe conditions remain, and consider having an electrician or plumber inspect the equipment.
How can I report the damage?
Report the flooding in more than one place because each report serves a different purpose:
- Call 311 to report specific problems such as sewer backups, catch basin overflow, mold, electrical hazards, damaged walls or make a complaint against an unresponsive landlord.
- Save the 311 service-request number and follow up if the problem is not addressed.
- Report power outages, gas leaks or immediate safety risks to the appropriate utility company or emergency service.
- Submit a report through New York City’s Damage Reporting Portal. Tenants can report the water level, sewage, property damage and insurance information.
- To access the Damage Information Form, you must sign in through NYC.ID, the city’s secure login system for online applications.
- People who do not have an email or social media account, or do not want to use one, can report damage by calling the Housing Recovery Office at (212) 615-8329.
Before completing the form, gather the following information:
- The damaged property’s address
- Insurance information for the property
- The landlord’s or tenant’s contact information
- The measured depth of any water or sewage inside the property
- Photos showing the damage
The City’s damage report does not replace a 311 complaint or an insurance claim, and submitting one does not guarantee financial assistance. However, it helps the City measure the extent of the disaster and identify federal funds. Nyhan says: “A lot of people have lost faith in [reporting to 311], but I try to remind them it just takes enough of it to be reported to be prioritized.”
What is my landlord responsible for after a flood?
By law, your landlord should disclose any prior flood damage to the leased place. Ask the landlord to confirm in writing when the apartment will be inspected and repaired. Landlords are responsible for maintaining safe housing conditions and addressing building-related flood damage. If the landlord does not respond, tenants can file a complaint through 311.
When contacting your landlord, clearly describe:
- When the flooding began
- How much water entered the apartment
- Whether the water may contain sewage
- Which rooms and building systems were affected
- Whether electricity, heat, hot water or plumbing is unsafe
- What repairs and professional cleanup are needed
- Whether the apartment is currently safe to occupy
Will my landlord’s insurance cover the damage?
It’s important to know that your landlord may have flood insurance for the property, but their insurance will not cover damage to your personal belongings. You can read more about flood insurance here.
