Alachua County, FL Flood Zone & Flood Risk Data
Alachua County, FL: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Alachua County scores at the 88.6th percentile for flood hazard, rated "Relatively Moderate", a middling flood hazard by national standards. The hazard here is driven by inland rivers and flash flooding rather than the coast, FEMA's model puts a flood event here at about 1.2 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Alachua County
Homes with a federally backed mortgage inside Alachua County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 18.4% of them do, 744 active policies against 4,050 structures FEMA counts in that zone, leaving a real compliance gap. Looking beyond the mandated zone, 2.5% of all residential structures in Alachua County carry flood coverage voluntarily or otherwise, relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Alachua County ranks
Among the 3144 US counties FEMA scores for flood hazard, Alachua County ranks 374, 1 being the highest hazard nationally, and 252 by population among all 3144 counties covered here, where 1 is the largest. About 291,782 people live in Alachua County, Florida, spread over 875.668 square miles.
Checking a specific address in Alachua County
2,149 of Alachua County's 84,597 residential structures carry flood coverage of some kind, per FEMA's latest count, useful context, not a substitute for checking one parcel.
Where Alachua County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.