Tree Removal & Heritage Trees: Altadena vs Norwalk
How do tree removal & heritage trees rules compare between Altadena, CA and Norwalk, CA?
Norwalk has fewer restrictions than Altadena.
Altadena, CA
Los Angeles County
Oak trees (genus Quercus) with a trunk circumference of 25 inches or more (8-inch diameter at 4.5 ft above grade) are protected — removal, damage, or encroachment into the protected zone requires an Oak Tree Permit under LA County Code Chapter 22.174.
View full Altadena rules →Norwalk, CA
Los Angeles County
Norwalk regulates tree removal on private property through permits and size thresholds. Street trees are city-managed and cannot be removed by residents.
View full Norwalk rules →Key Facts Comparison
| Fact | Altadena | Norwalk |
|---|---|---|
| Code Section | LA County Code Ch. 22.174 | - |
| Protected Size | ≥8 in DBH / 25 in circumference | - |
| Protected Zone | 5 ft outside dripline | - |
| Replacement | 2:1 typical | Required for removed trees |
| Heritage Oak | ≥36 in diameter | - |
| Permit Threshold | - | 6 to 12 inch trunk diameter |
| Street Trees | - | City-managed only |
| Hazardous Trees | - | Expedited process |
Highlighted rows indicate differences between cities.
Altadena FAQ
Do I need a permit to remove an oak in Altadena?
Yes if the oak is 8 inches in diameter or larger at 4.5 feet above grade — LA County Code Ch. 22.174 (Oak Tree Permits) applies.
Norwalk FAQ
Do I need a permit to remove a tree?
If the trunk exceeds the size threshold (typically 6 to 12 inches), yes. Check Norwalk tree ordinance for details.
Who handles street trees?
Norwalk public works or urban forestry manages all trees in the public right-of-way.
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