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Flood Form

Understand Your Property’s Flood Exposure

Enter your NYC address to generate your Flood Form — a personalized compound flood exposure report for your property.

Free. Takes about 60 seconds.

What your free Flood Form covers

Every NYC property gets a rating for four kinds of flooding, on a Minimal to High scale, built from parcel records, elevation, sewer infrastructure, and flood exposure data for your specific lot.

  • Stormwater

    Rainfall runoff from your roof, your lot, and the blocks uphill — the most common reason NYC yards and basements take on water.

  • Sewer Backup

    During moderate-to-heavy rain, combined sewers can exceed capacity and push water back up through floor drains and fixtures.

  • Groundwater

    High water tables and buried historic streams and ponds that let water seep through foundations, even far from the coast.

  • Coastal

    FEMA flood zones, Hurricane Sandy inundation, and tidal wetlands for properties near the shoreline.

Your report also recommends measures suited to your lot, such as downspout diversion, on-site infiltration, detention, drain improvements, and backflow preventers.

How it works

  1. Step 1

    Free Flood Form

    Enter your address for a free report in about 60 seconds, plus a free 15-minute consultation call if you want one.

  2. Step 2

    Flood Form+ or a site visit

    Flood Form+ ($249) adds an advanced diagnostic, infiltration capacity, and funding programs. A site visit ($599) adds an on-site assessment and includes Flood Form+.

  3. Step 3

    Flood Form Strategy

    A mitigation plan for your property, starting at $3000, then contractor bidding, construction verification, and ongoing maintenance.

Read the FAQ →

Flood exposure by NYC neighborhood

How stormwater, sewer backup, groundwater, and coastal exposure break down across each of the city’s combined sewer areas.

All NYC sewersheds →