Summary: Under Seattle Municipal Code (SMC) Chapter 25.9, the City of Seattle regulates activities on sites that include environmentally critical areas (ECAs) such as landslide-prone areas, flood-prone areas, riparian corridors, wetlands, wetland buffers, steep slope erosion hazard areas, and steep slope erosion hazard area buffers. The application and review process of development proposals on parcels affected by ECAs requires a surveyed site plan and the submittal of additional information relating to ECAs and their buffers. This information is required in addition to technical reports described in SMC Sections 25.09.060 and 25.09.330 and site plan requirements outlined in Tip 103, Site Plan Requirements.

Date Revised: 01/29/2019

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