I have not had a problem, but several of my neighbors have had problems in recent years with roots growing into their sewer line that runs from the house to the street. They have dealt with backups in the basement, ruined things in the basement, etc. The problem seems to be that in front of everyone's house, in the easement, everyone has a large maple or similar tree. Anyway, like I said, I haven't had a problem, but I was wondering what sort of preventive action I could take to avoid similar problems (other than cutting down the tree).