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Posts tagged with environmentally critical areas Archives - Building Connections

Updating Information Related to Environmental Critical Areas

November 3, 2025

We’re in the process of updating outreach materials related to Environmental Critical Areas (ECAs) to clarify when a separate ECA exemption application is required per Seattle Municipal Code (SMC) 25.09.045. Approval of an ECA exemption allows for certain development activities within ECAs. A separate ECA exemption application in advance of a… [ Keep reading ]

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Updated Liquefaction-Prone Area Map

September 1, 2023

SDCI has updated the Environmentally Critical Areas (ECA) Map for Liquefaction-Prone areas. Liquefaction occurs when loose, saturated soils lose their strength due to strong ground shaking (usually from earthquakes). Details of the update are described in Director’s Rule 2-2023, Update of ECA Liquefaction-Prone Areas Map, which was effective August 30, 2023. You can view the new liquefaction-prone ECA layer on our GIS map. 

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