应该市里负责

 

http://tdn.com/news/local/damage-caused-by-city-trees-rarely-covered-by-city-s/article_5640da98-d341-11e4-82fa-a77c9d4d7909.html

起码这篇文章说，

“It’s basically case law in the state — it’s not just city tree owners, it goes for private owners too,” said Ann Bennett, executive director of the Washington Cities Insurance Authority. “Being the Evergreen State, there are lots of trees, but we’re not the insurer of God.”

She said tree owners are liable and potentially on the hook to pay for damages if they are aware of problems and do nothing about them.