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Discussion Paper
Flood Risk Outside Flood Zones — A Look at Mortgage Lending in Risky Areas
In support of the National Flood Insurance Program (NFIP), the Federal Emergency Management Agency (FEMA) creates flood maps that indicate areas with high flood risk, where mortgage applicants must buy flood insurance. The effects of flood insurance mandates were discussed in detail in a prior blog series. In 2021 alone, more than $200 billion worth of mortgages were originated in areas covered by a flood map. However, these maps are discrete, whereas the underlying flood risk may be continuous, and they are sometimes outdated. As a result, official flood maps may not fully capture the true ...
Report
Do Mortgage Lenders Respond to Flood Risk?
Using unique nationwide property-level mortgage, flood risk, and flood map data, we analyze whether lenders respond to flood risk that is not captured in FEMA flood maps. We find that lenders are less willing to originate mortgages and charge higher rates for lower LTV loans that face “un-mapped” flood risk. This effect is weaker for high income applicants, as well as non-banks and small local banks. However, we find evidence that non-banks and local banks are more likely to securitize/sell mortgages to borrowers prone to flood risk. Taken together, our results are indicative that ...
Discussion Paper
Flood Risk and Flood Insurance
Recent natural disasters have renewed concerns about insurance markets for natural disaster relief. In January 2025, wildfires wreaked havoc in residential areas outside of Los Angeles. Direct damage estimates for the Los Angeles wildfires range from $76 billion to $131 billion, with only up to $45 billion of insured losses (Li and Yu, 2025). In this post, we examine the state of another disaster insurance market: the flood insurance market. We review features of flood insurance mandates, flood insurance take-up, and connect this to work in a related Staff Report that explores how mortgage ...