Edmonds, WA Environmental Rules: Flood Zones (2026)

07 to every special flood hazard area within Edmonds city limits, based on the Flood Insurance Study for Snohomish County dated June 19, 2020 and its accompanying Flood Insurance Rate Maps, both on file at the planning and development department at 121 5th Avenue North. 020 defines broadly to include buildings, mining, dredging, filling, grading, paving, excavation, drilling operations, and storage of equipment or materials. Applications must include site plans, an elevation certificate showing the lowest floor's elevation relative to mean sea level, floodproofing certification by a registered engineer or architect for nonresidential buildings, a description of any watercourse alteration, and a V-zone design certificate where applicable.

The building official, acting as floodplain administrator, reviews each permit to confirm chapter requirements are met, other state and federal permits are secured, and the site is reasonably safe from flooding, and must notify FEMA when annexations bring new territory into the special flood hazard area. 050 requires a habitat assessment with most development permit applications unless the work fits a listed exemption, such as normal maintenance under 50 percent of structure value, footprint expansions of 10 percent or less, or open space development that removes no more than five percent of native vegetation.