The Wildland Urban InterfaceThis layer represents the Washington Wildland Urban Interface (WUI) as mapped in 2019 by  WA State Dept. of Natural Resources - Wildfire and Forest Health & Resiliency divisions under consultation from the USFS Rocky Mtn Research Station. The Dept. was prompted by ESSB 6109 to map the WUI in WA State for the purpose of county-based building code adoptions. The WUI depicts areas of WA where structures and wildland meet or intermingle. Specific structure densities and wildland cover are necessary to meet the definitions for WA State's WUI. For more information about the WUI, please contact: ashley.blazina@dnr.wa.gov