Yes, untreated infested trees have to be removed or treated or they will become a safety hazard. If you see a tree that appears infested or hazardous, let us know by reporting a tree concern or calling 763-572-3566. Under City Code Chapter 104. the city forester will prescribe whether the tree can be treated or should be removed. If the tree is not removed within the timeline established by the letter, the tree will be abated and costs assessed to the property owner.