The answer to 'types of sewer line' is that there are several common types of sewer lines used in residential plumbing. The most common are:
Vitrified Clay Pipes - These are traditional clay pipes that have been glazed and fired in a kiln. They are durable and resistant to corrosion, but can crack or collapse over time.
PVC (Polyvinyl Chloride) Pipes - Modern plastic pipes made from PVC are a popular choice for new construction and sewer line replacements. They are lightweight, corrosion-resistant, and relatively inexpensive.
Cast Iron Pipes - Older homes may have cast iron sewer lines, which are heavy-duty but can rust and deteriorate over decades of use.