SEA STUDIES
2025 SEA Update Study
- 2025 SEA Study Final Report
- Appendix A – Species Lists Used in Analysis
- Appendix B – Methodology and Workflow
- Appendix C – Threatened and Endangered Species of Los Angeles County
- Appendix D – Inventory of Geographic Data Reviewed and Analyzed
- Appendix E – Field Visits and Verification
- Appendix F – Technical Advisory Committee Process and Summary of Input
2000 SEA Update Studies
- Los Angeles County Significant Ecological Area Update Study – 2000 Executive Summary
- Los Angeles County Significant Ecological Area Update Study 2000 – Background Report
- Los Angeles County Significant Ecological Areas Update Study 2000 – SEA Criteria
- Biological resources Assessment of the Proposed Antelope Valley SEA
- Biological Resources Assessment of the Proposed Cruzan Mesa Vernal Pools SEA (Nov 2000)
- Biological Resources Assessment of the Proposed East San Gabriel Valley SEA (Nov 2000)
- Biological Resources Assessment of the Proposed Joshua Tree Woodland SEA (Nov 2000)
- Biological Resources Assessment of the Proposed Puente Hills SEA (Nov 2000)
- Biological Resources Assessment of the Proposed San Andreas Rift Zone SEA (Nov 2000)
- Biological Resources Assessment of the Proposed San Dimas Canyon/San Antonio Wash SEA (Nov 2000)
- Biological Resources Assessment of the Proposed San Gabriel Canyon SEA (Nov 2000)
- Biological Resources Assessment of the Proposed Santa Catalina Island SEA (Nov 2000)
- Biological Resources Assessment of the Proposed Santa Clara River SEA (Nov 2000)
- Biological Resources Assessment of the Proposed Santa Monica Mountains SEA (Nov 2000)
- Biological Resources Assessment of the Proposed Santa Susana Mountains/Simi Hills SEA (Nov 2000)
- Sensitive Species Compendium January 2006
- Additional Study Sources 2005-2006
1991 Supplemental Studies
- Phase I Study for the Cold Creek Significant Ecological Area No.9
- Phase I Report for the San Fransciquito Canyon Significant Ecological Area No.19
- Phase I Study for the Dudleya Densiflora Population Significant Ecological Area No.45
- Phase I Study for the Kentucky Springs: Significant Ecological Area No.61
- Phase I Study for the Las Virgenes: Significant Ecological Area No.6
- Phase I Study for the Tonner Canyon/Chino Hills SEA No. 15
- Phase I Study for the Tuna Canyon SEA No. 10
1970-1980s
- 1970 Environmental Development Guide
- 1973 General Plan of Los Angeles County
- 1976 Land Capability/Suitability Study, Los Angeles County General Plan Revision Program – Significant Ecological Areas Report
- 1980 County of Los Angeles General Plan Technical Supplement E (SEA Descriptions)
- 1982 Significant Ecological Areas of the Santa Monica Mountains Report
1982 SEA ORDINANCE
Older SEA Ordinance only applicable to projects in Santa Catalina Island.