Flooding is the most widespread and destructive natural disaster in the United States, threatening homes from coastlines to river valleys, and everywhere in between. This in-depth, state-by-state guide breaks down FEMA-designated flood zones, local flood hazards, and historical flood events across all 50 states. Created to support SewerAlarm’s mission of protecting properties from sewer backup damage, this resource is essential for homeowners, plumbers, insurers, and real estate professionals seeking to understand and mitigate flood-related risk.