Collier County, FL Environmental Rules: Flood Zones (2026)

Collier County's Floodplain Management Ordinance, adopted at Code §§ 62-26 through 62-86, applies to all of the unincorporated county's flood hazard areas as mapped on the federal Flood Insurance Rate Maps, currently based on the Flood Insurance Study dated February 8, 2024. Section 62-71(B) defines the ordinance's scope broadly: it covers subdivision of land, filling, grading, and utility installation; construction, alteration, or demolition of any building or structure exempt from the Florida Building Code; placement of manufactured homes; installation or replacement of tanks; placement of recreational vehicles; installation of swimming pools; and any other development, whether inside a mapped special flood hazard area or in the lower-risk Zone X and Zone X-500 areas where the county still sets minimum floor elevations.

Under § 62-74(A), any owner or authorized agent who intends any of that activity in a flood hazard area must first apply to the Floodplain Administrator, a role Collier County assigns to the County Manager or designee, and obtain a floodplain development permit before beginning work; a building permit alone does not substitute for it. The Administrator reviews site plans and construction documents, can require additional elevation data from a Florida-licensed engineer, and coordinates with the Building Official on substantial-improvement and substantial-damage determinations. A floodplain permit expires if work does not start within 180 days of issuance, or is suspended for 180 days once started, though the Administrator can grant written extensions for justified cause.