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.