City of Seattle ArcGIS OnlinePeat-settlement-prone areas (sites containing peat and organic soils that may settle when the area is developed or the water table is lowered). Peat settlement-prone areas. Peat settlement-prone areas consist of Category I and Category II peat settlement-prone areas that are delineated on Maps A1 through A26, Peat Settlement-prone Area Boundaries Maps, codified at the end of this Chapter 25.09 . This parcel-specific delineation is based on the location of the relevant bog or bogs identified in City of Seattle Identified Bogs (Troost 2007) plus a buffer of 50 feet for Category I peat settlement-prone areas or a buffer of 25 feet for Category II peat settlement-prone areas. On parcels larger than 50,000 square feet, the Director may consider a parcel-specific delineation, provided by the applicant, of the peat settlement-prone area boundary on a parcel. Where a parcel-specific delineation conflicts with the Peat Settlement-prone Area Boundaries Maps, the parcel-specific delineation shall apply. For more information about the definition of peat settlement prone areas, see Seattle Municipal Code section 25.09.012 , Environmentally Critical Areas (ECA) definitions. Updated as needed.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/f5cfa9978a494cd7878a7efd3d3e1526_6engSeattle GeoDataPublicECA - Peat Settlement Prone Area [Washington (State)--Seattle]Web servicesWashington (State)--SeattleWashington (State)Last Modified: 2026-02-17