This question has been brought to my attention several times while selling homes. I found this article and wanted to share it with you guys. It will explain the importance of including a sewer line scope inspection with your home inspection. Check out the video of one of my client's inspections.
Sewer Inspections for Older Homes
Sewer Line Inspections for Home Buyers
By Elizabeth Weintraub, About.com Guide
Very few first-time home buyers ask for a sewer inspection before buying a home. Sewer inspections are not something most buyers think about. They know to get a home inspection, but sewer lines are almost an after thought, if it crosses a buyer's mind at all. Yet it's one of the most important inspections a buyer of older homes should conduct. The time to find out if a sewer is faulty or needs replacement is before buying a home, not after the fact. I recommend to all my buyers that they obtain a sewer inspection if the home is older than 20 years. Although the sewer line may be fairly new as compared to homes built before 1950, for example, tree roots can still clog up a 20-year-old sewer line.
Reasons to Inspect the Sewer Line