Tree Trimming: Altadena vs Castaic
How do tree trimming rules compare between Altadena, CA and Castaic, CA?
Altadena and Castaic have similar restriction levels.
Altadena, CA
Los Angeles County
Trimming protected oak trees (≥8 in DBH) requires an Oak Tree Permit if the work enters the protected zone or removes >25% of crown. Street trees in the public right-of-way are maintained by LA County Public Works.
View full Altadena rules →Castaic, CA
Los Angeles County
Tree trimming in unincorporated LA County is generally unrestricted for private property, except for protected oak trees. Any cutting or pruning of oak trees 8+ inches diameter requires an Oak Tree Permit under Chapter 22.174. Street trees are managed by county public works.
View full Castaic rules →Key Facts Comparison
| Fact | Altadena | Castaic |
|---|---|---|
| Oak Permit Required | Yes if entering protected zone | - |
| Code Section | LA County 22.174.040 | - |
| Parkway Trees | Maintained by LA County DPW | - |
| Utility Pruning | Allowed with notice (PUC 911) | - |
| Private Trees | - | Generally no permit needed |
| Oak Trees | - | Permit required for 8+ inch diameter |
| Street Trees | - | County public works manages |
| Reference | - | Chapter 22.174 (Oaks) |
Highlighted rows indicate differences between cities.
Altadena FAQ
Can I trim the oak in my Altadena backyard?
Light pruning of dead wood is generally fine, but anything entering the protected zone or removing >25% of crown needs an Oak Tree Permit under LA County Code 22.174.040.
Castaic FAQ
Do I need a permit to trim trees on my property in LA County?
No permit is needed for general trimming of most species. However, oak trees are protected under the Oak Tree Ordinance (Chapter 22.174) and trimming that could harm the tree's health may require a permit. Contact the Department of Regional Planning at (213) 974-6411.
Can I trim my neighbor's tree branches that hang over my property?
Yes. Under California law, you can trim branches that overhang your property line back to the property line. However, you cannot trim in a way that kills the tree or you may be liable for its replacement value.
Who trims trees near power lines?
Utility companies (Southern California Edison, LADWP) have the right and responsibility to trim trees near power lines. Contact your utility provider to request trimming. Do not attempt to trim near power lines yourself.
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