FEMA flood maps may understate risk for many homeowners
Homes outside FEMA flood zones face underestimated risks, leaving owners financially vulnerable and facing greater damage than neighbors.
Floodwater from Hurricane Beryl affected Houston neighbors in different ways in July 2024. Brandon Bell/Getty Images) (Photo via The Conversation)
Many homeowners living outside federally designated flood zones may face a higher risk of property damage than official maps suggest. According to an article published on Nov. 2, 2026, in The Conversation, FEMA’s 100-year flood maps do not fully capture the complexity of flood hazards, leaving some residents with a false sense of security regarding their vulnerability.
The report, authored by Yilei Yu of Rice University, Dylan Connor of Arizona State University and James R. Elliott of Rice University, notes that significantly more homes are at risk of flooding than those currently identified by federal agencies. Because these properties are not in designated zones, owners are often not required to purchase flood insurance, which can leave them financially exposed when disaster strikes.
The authors emphasize that flood risk does not adhere to static lines on a map and that impacts vary significantly even within the same neighborhood. They state that floods do not hit every house on a street the same way, suggesting that current mapping methods may be insufficient for individual property assessments.
To address these limitations, the researchers propose that local communities integrate local data on infrastructure and insurance with existing address-level flood scores. This approach is intended to help officials identify vulnerable housing more accurately and guide future investments in flood-proofing and disaster recovery efforts.