By Elinor Romig Sewer systems are one of those things that most homeowners don't think about. After all, you are just happy that everything goes down the drain and you never have to see it again. Unfortunately, things can go wrong with your sewer system, and damaged pipes are a common repair. Since repairing the sewage line is critical for preventing the spread of illness, you should always be alert for these signs that your pipe has sustained damage that can only be fixed by your plumber. Age is the first thing to consider. A lot of cast iron pipes won't last beyond 30 years, which is something to think about if you have an older home. ...