FEMA Flood Zones

Zone A99

Areas subject to inundation by the 1-percent-annual-chance flood event, but which will ultimately be protected upon completion of an under-construction Federal flood protection system

Zone AR

Areas that result from the decertification of a previously accredited flood protection system that is determined to be in the process of being restored to provide base flood protection

Zone D

Area where there are possible but undetermined flood hazards and no analysis of flood hazards has been conducted.

Zone V

Areas along coasts subject to inundation by the 1-percent-annual-chance flood event with additional hazards associated with storm-induced waves

Zone B and X (shaded)

Areas of 0.2-percent-annual-chance floodplain, areas of 1-percent-annual-chance (base flood) sheet flow flooding with average depths of less than 1 foot, areas of base flood stream flooding with a contributing drainage area of less than 1 square mile, or areas protected from the base flood by levees

Zone AH

Areas subject to inundation by 1-percent-annual-chance shallow flooding (usually areas of ponding) where average depths are between one and three feet

Zone AO

Areas subject to inundation by 1-percent-annual-chance shallow flooding (usually sheet flow on sloping terrain) where average depths are between one and three feet

Zone AE and Zone A1-30

Areas subject to inundation by the 1-percent-annual-chance flood event determined by detailed methods

Zone A

Areas subject to inundation by the 1-percent-annual-chance flood event generally determined using approximate methodologies

Zone VE and Zone V1-30

Areas subject to inundation by the 1-percent-annual-chance flood event with additional hazards due to storm-induced velocity wave action

Zones C and X (unshaded)

Flood insurance rate zones used for areas outside the 0.2-percent-annual-chance floodplain