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Significant Ecological Areas (SEA) – Existing/Adopted

Significant Ecological Areas (SEA) Significant Ecological Area (SEA) means an area that is determined to possess an example of biotic resources that cumulatively represent biological diversity for the purposes of protecting biotic diversity, as part of the Los Angeles County general plan or the city’s general plan. Additional regulations shall be applied based on Title 22 (Planning and Zoning) of the Los Angeles County Code (previously section – 22.56.215): Hillside management and significant ecological areas — Additional regulations.  More information about the County’s SEA Program can be found at:

Data can be downloaded here:

Download Shapefile / Layer File (.zip)

Update History:

  • 12/27/12 – for the updated Santa Clarita Valley Area Plan going into effect.
  • 9/5/13 – to take out insignificant parcel portions (slivers and portions of parcels less than 100 sq. feet) as decided on at a Project Review meeting on 8/5/13 – Management and County Counsel present. SEA numbers in newly adopted Santa Clarita Valley Area Plan also taken out.
  • 6/25/15 – updated to include expanded SEAs in the Antelope Valley following the Board of Supervisors’ adoption on 6/16/15.
  • 11/5/15 – updated to include the expanded SEAs in urban areas following the Board of Supervisors’ adoption of the General Plan 2035.
  • 11/26/18 – updated Cruzan Mesa Vernal Pools SEA following the Plum Canyon / Skyline Ranch / North Sand Canyon annexation to the city of Santa Clarita – a large portion of that SEA is now in the city’s jurisdiction.
Using GIS Data on this site

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GIS data available on this website is provided AS IS - please read the GIS Data Portal Terms of Use

Data Field Descriptions
  • SEA_NAME - name of SEA
  • SEA_TYPE - Type of SEA (eg. Coastal Area, SEA, Conceptual SEA
  • IMPLEMENTA - Identifies whether it is in unincorporated and under jurisdiction of the DRP SEA Ordinance

GIS Source Information
Feature Dataset Name (if applicable):
Reference Date: 2018
Accuracy: Other
Update Frequency: As Needed
Access Constraints:None

Contact Information
Nick Franchino
GIS Manager
County of Los Angeles
Regional Planning Department
320 W. Temple St.
Mailstop Room 1361
Los Angeles, CA 90012

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