it is possible. I think it would probably take at least several hundred years.
I don't think it will happen though.
I got somthing you may find intersting. I'm not sure how this happened exactly. I'm not a plumbing expert. I also am not sure where this happened. I heard from someone else.
anyway, the city decided to put some pipe in underground. I don't quite understand why, but anyway this pipe had a dead end, and sombody decided to tap into this pipe, and use it for a sewer. Well, that worked for about a couple years. until one day the pipe got full, and backed up into his house.