Is the Home in a Flood Zone? How to Check Before You Buy

After Hurricane Sandy in 2012 and Hurricane Ida in 2021, many New York buyers now ask: will this home flood? The answer affects more than peace of mind. It determines whether you need flood insurance, what it costs each year and how easily you can resell.

Step One: Check the FEMA Flood Map

The Federal Emergency Management Agency’s Flood Insurance Rate Map (FIRM) is the starting point. Enter the address at FEMA’s Flood Map Service Center (msc.fema.gov). Common zones:

If the home is in a high-risk zone and your mortgage comes from a federally regulated or federally backed lender, the lender will require flood insurance.

New York City Buyers: Look at Two More Maps

New York City has its own wrinkles:

• The effective map dates from 2007, and flood insurance rates are still based on it;
• The 2015 Preliminary FIRMs. The City filed a technical appeal of these maps, FEMA agreed to revise them, and new maps have not yet taken effect. For building code purposes, however, new and substantially improved buildings must meet stricter standards;
• The NYC Flood Hazard Mapper, from the Department of City Planning, shows the effective map, the 2015 preliminary map and projections of future sea level rise together;
• The NYC Stormwater Flood Maps. Many of the deaths during Hurricane Ida occurred in basements far from the coast. Rainfall flooding does not necessarily show up on FEMA maps, and these maps fill that gap.

The FloodHelpNY website can also help New York City residents estimate flood risk and premiums.

Outside New York City, check your county’s GIS maps and the New York State Department of Environmental Conservation (DEC) floodplain and coastal erosion maps. Pay particular attention along the Long Island coast and the Hudson River.

Step Two: Read the Seller’s Disclosure Statement

Since March 20, 2024, sellers of one- to four-family homes must deliver a Property Condition Disclosure Statement (PCDS) before the buyer signs a contract. The new form adds several flood questions, such as:

• Whether the home is in a FEMA 100-year or 500-year floodplain;
• Whether federally required flood insurance is in place;
• Whether the home has flooded or had flood insurance claims;
• Whether FEMA or other federal disaster assistance was received.

That last question matters: if a prior owner received federal disaster assistance conditioned on maintaining flood insurance and let it lapse, future owners may be ineligible for federal disaster assistance.

Note: condo and co-op sellers do not complete a PCDS. For those purchases, your attorney should ask the building about its flood history, flood insurance, where mechanical equipment is located, and any repairs and assessments after Sandy or other storms.

Step Three: Get an Insurance Quote Before You Sign

• Quote first, sign second. Since FEMA’s Risk Rating 2.0 pricing took effect in 2021, flood premiums are based on each home’s specific risk, and they can be substantial in high-risk zones;
• Ask whether you can assume the seller’s policy. National Flood Insurance Program (NFIP) policies can, under certain conditions, be assigned to a buyer, which is sometimes cheaper than buying new;
• Mind the waiting period. A new NFIP policy generally has a 30-day waiting period, but a policy purchased in connection with a mortgage can usually take effect at closing;
• Coverage limits. NFIP residential policies cap building coverage at $250,000 and contents at $100,000, so higher-value homes may need supplemental private flood insurance;
• An Elevation Certificate can support a more accurate premium. If the structure actually sits above the base flood elevation, a Letter of Map Amendment (LOMA) may remove the mandatory insurance requirement.

Step Four: Look in Person and Bring in Professionals

During the inspection, look for water stains, white mineral deposits or musty odors in the basement, a sump pump, a backwater valve, yard grading, and whether mechanical equipment sits in the basement.

If You Rent It Out, You Must Disclose Too

If you plan to rent the home, New York law (Real Property Law §231-b) has required landlords since 2023 to disclose in residential leases whether the property is in a floodplain and its flood history.

Attorney’s Insight

Flood risk is one of the problems New York buyers most often discover only after closing. Three suggestions:

• Don’t rely on one map. A “low risk” FEMA zone does not mean the home won’t flood. In New York City, always check the stormwater maps as well, especially for homes with basements or basement rental units;
• Treat flood insurance as part of the purchase price. If the annual premium would strain your budget, you want to know before signing, not a week before your lender funds the loan;
• Be especially careful with basement living space. Since Ida, the legality and safety of basement units have drawn more attention. If you are buying a home with a basement rental, have your attorney check the Certificate of Occupancy to confirm whether that unit is legal.

Attorney’s perspective

Before you sign, we make sure you have checked the flood zone, insurance cost and disclosures, and that the contract keeps the contingencies you need.

For advice about your own situation, call +1 718-218-5805 or schedule a consultation. We meet clients in Flushing and Manhattan, in English or Chinese.

Series overview

This article is for general information only and is not legal advice. Reading it does not create an attorney-client relationship. For advice about your situation, please contact us.

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