SFHA

A Special Flood Hazard Area is land that FEMA's flood maps place within the one-percent-annual-chance floodplain — the area with at least a one-in-a-hundred chance of flooding in any given year, colloquially the '100-year floodplain'. SFHA status is parcel-specific and legally consequential: federally backed mortgages on structures within an SFHA require flood insurance, and construction within one is subject to elevation and construction standards keyed to the mapped flood elevations.

The maps divide SFHAs into zones reflecting flood source and severity, and they are revised over time — so a lot's status can change with a map update. PearlAudit determines SFHA status by testing the lot's actual parcel geometry against the current mapped flood boundaries rather than approximating by ZIP code.