Millions of homeowners face flood risks without realizing it, and climate change is making it worse

A new report shows that nationally, there are at least 6 million households that are unaware they’re living in homes that have a 1 percent chance of flooding in each year — putting them within a “100-year” flood zone. This is nearly 70 percent more homes at substantial risk of flooding than are within the Federal Emergency Management Agency’s Special Flood Hazard Areas, a designation that determines eligibility for the National Flood Insurance Program.