Heritage & Protected Trees: Altadena vs Topanga
How do heritage & protected trees rules compare between Altadena, CA and Topanga, CA?
Topanga has fewer restrictions than Altadena.
Altadena, CA
Los Angeles County
Oak trees ≥36 inches in diameter qualify as Heritage Oaks under LA County Code Chapter 22.174 and receive heightened review. Removal is rarely approved.
View full Altadena rules →Topanga, CA
Los Angeles County
LA County's Oak Tree Permit Ordinance (Chapter 22.174) protects oak trees in unincorporated areas. Heritage oak trees are recognized for their commemorative, horticultural, and historical significance. The ordinance aims to preserve and propagate the oak tree heritage. County forester reviews applications.
View full Topanga rules →Key Facts Comparison
| Fact | Altadena | Topanga |
|---|---|---|
| Heritage Threshold | ≥36 in DBH | - |
| Code Section | LA County Code Ch. 22.174 | - |
| Replacement Ratio | Up to 4:1 | - |
| Heritage Oaks | - | Recognized for significance |
| Ordinance | - | Chapter 22.174 |
| Review | - | County forester inspection |
| Purpose | - | Preserve threatened oak heritage |
Highlighted rows indicate differences between cities.
Altadena FAQ
What is a Heritage Oak in Altadena?
Any oak with a trunk 36 inches in diameter or larger under LA County Code Ch. 22.174 — these receive heightened protection.
Topanga FAQ
Are oak trees protected in LA County?
Yes. All native oaks with trunks 8+ inches in diameter (25+ inches circumference) are protected under the Oak Tree Permit Ordinance (Chapter 22.174). You need a permit before removing, relocating, or working near a protected oak.
What is the protected zone around an oak tree?
The drip line of the tree plus 5 feet in all directions. No grading, paving, trenching, or construction is allowed within this zone without an Oak Tree Permit. Root compaction from heavy equipment is also prohibited.
How do I get an Oak Tree Permit?
Apply through the LA County Department of Regional Planning at (213) 974-6411. An arborist report is typically required. The process includes review of alternatives to removal and may require replacement planting.
Compare other topics
See how Altadena and Topanga compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool