Removing a tree (dead or alive) 9"+ in diameter at 4.5 ft anywhere in city limits needs a permit. Trees under 9" do not. Leaf or needle drop alone is not a valid reason for removal.
How to apply: Apply online in Accela (Engineering › Online Tree Removal). The City arborist visits before approval. Urgent removals: call Public Works, 925-943-5854.
How to measure: most Bay Area cities measure trunk diameter (or circumference) at 4.5 ft (54") above natural grade, but some measure elsewhere: Berkeley at 4 ft, Redwood City at the widest point between 6" and 36". Where a city sets its limit by circumference, we show the diameter (circumference ÷ 3.14).
Official sources: walnutcreekca.gov/government/public-works/engineering-servic · ecode360.com/48488057