Snohomish County, WA Environmental Rules: Flood Zones (2026)

65 SCC establishes and regulates Snohomish County's special flood hazard areas. 010 states its purpose to protect the public health, safety and welfare in those areas subject to periodic inundation due to flooding, and to minimize losses due to flood conditions. 040(1) adopts by reference the Federal Insurance Administrator's Flood Insurance Study for Snohomish County, Washington, and Incorporated Areas, dated June 19, 2020, along with the accompanying Flood Insurance Rate Maps (FIRMs) of the same date, on file at 3000 Rockefeller Avenue in Everett, as the areas this chapter governs.

250, a flood hazard permit shall be obtained. The county's Department of Planning and Development Services decides the permit as a Type 1 administrative decision, approving, conditioning, or denying it. 030. 65's floodproofing, floodway-encroachment, and density-fringe-area requirements, will not significantly increase flooding on other lands, and will not materially pollute or add turbidity to flood waters. 110, requiring new construction and substantial improvements to be anchored against flotation and lateral movement, built with flood-damage-resistant materials, and, where base flood elevation isn't otherwise available, elevated at least two feet above the highest adjacent grade in an Unnumbered A zone. 85 SCC.