Los Angeles County protects significant trees in unincorporated areas through its Oak Tree Ordinance (Title 22, Chapter 22.174) and related regulations. The ordinance requires permits for removal or relocation of oak trees and other protected species. Heritage trees receive enhanced protection. Mitigation including replacement planting is required when removal is approved.
Los Angeles County's Oak Tree Ordinance (Chapter 22.174 of the County Code) provides comprehensive protection for oak trees in unincorporated areas. The ordinance applies to native oak trees with trunks measuring 8 inches or more in diameter at breast height (4.5 feet above ground). A permit from the Department of Regional Planning is required before any oak tree can be removed, relocated, or significantly encroached upon. The permit process requires submission of an oak tree report prepared by a certified arborist. Heritage oaks and specimens of exceptional size or historical value receive the highest level of protection, and removal is generally discouraged. When removal is approved, mitigation is required including replacement planting at a ratio determined by the reviewing authority, typically 2:1 or higher. In-lieu fees may be accepted when on-site replacement is not feasible. The county also protects trees through its Significant Ecological Areas (SEA) program, which adds additional environmental review for development in sensitive habitats. Street trees in county-maintained rights-of-way are managed by the Department of Public Works.
Unauthorized removal of protected oak trees can result in significant penalties including fines up to $1,000 per tree, required replacement planting at enhanced ratios, and potential criminal prosecution. Development projects that damage protected trees without permits may face stop-work orders and additional mitigation requirements.
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