Florissant, MO Environmental Rules: Flood Zones (2026)

Chapter 415, adopted by Ordinance No. 020, governs all land within the City of Florissant identified on the FEMA Flood Insurance Rate Maps as numbered or unnumbered A Zones and AE Zones, covering eleven map panels for St. Louis County effective February 4, 2015. 020, no development, defined broadly to include new construction, substantial improvement, fill, and the placement of manufactured homes, may proceed in a mapped flood hazard area without a floodplain development permit issued by the City Council or its designated representative. 030 for reviewing every permit application to confirm the site is reasonably safe from flooding, verifying that all other required federal, state and local approvals have been obtained, notifying adjacent communities and the Missouri State Emergency Management Agency before any watercourse is altered or relocated, and maintaining permanent elevation records for every new or substantially improved structure.

An application must describe the parcel, the proposed work, the intended use, the assessed and market value of the improvement, whether the site sits in the floodway or the flood fringe, and the base flood elevation, and it must be accompanied by construction plans. Ordinance 8101 also repealed and replaced the City's earlier Flood Damage Prevention and Control chapter, Code 1980 Sections 6-38 through 6-42.