

When looking at this broader level of risk, the data identifies 21.8 million properties in the U.S. When adjusting for future environmental factors, the Foundation’s model finds the number of homes with substantial risk grows to 16.2 million by the year 2050.įinally, the First Street Foundation Flood Model also calculates the number of properties facing ANY risk of flooding. ( The First National Flood Risk Assessment, First Street Foundation, 2020) Therefore, while FEMA classifies about 8.7 million properties as having substantial risk, or within Special Flood Hazard Areas (SFHAs), the First Street Foundation Flood Model identifies about 70 percent more than that number, or 14.6 million properties with the same level of risk. Flood Factor™ was developed by First Street Foundation specifically to provide accurate, property-level, publicly available flood risk information and displays not only the current risk of property flooding, but also the likelihood of that property experiencing a flood event over the next 30 years. FEMA intends to incorporate future environmental changes into their model but has not yet started that effort.
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FEMA flood maps are used to determine insurance and building code requirements, whereas the Flood Factor can be used to help determine flood risk to the specific home today and into the future.įEMA flood maps were not created to define risk for individual properties and do not take into account changing environmental conditions 1 2. Your FEMA zone and Flood Factor are two independent risk assessments.


These zones have a 0.2% annual chance of flood being equaled or exceeded.Moderate-risk flood zones are labeled Zone B or Zone X (shaded) on the map

Flood insurance is mandatory for structures with mortgages from federally regulated or insured lenders.This is also referred to as a 100-year flood, meaning there is a 1 in 100 chance of flood in a given year, and 26% chance of flooding over 30 years.These zones have a 1% annual chance of flood being equaled or exceeded.High-risk floods zones are labeled on the Flood Insurance Rate Map as Zone A, Zone AO, Zone AH, Zones A1-A30, Zone AE, Zone A99, Zone AR, Zone AR/AE, Zone AR/AO, Zone AR/A1-A30, Zone AR/A, Zone V, Zone VE, and Zones V1-V30.
