The pipe material you choose for your sewer line affects its longevity, performance, and cost. Common sewer pipe materials in NYC include PVC (polyvinyl chloride), cast iron, ductile iron, vitrified clay, and HDPE (high-density polyethylene). PVC is the most popular choice for residential sewer lines due to its durability, smooth interior, resistance to root intrusion, and affordability. Cast iron is still used in many NYC buildings and offers excellent sound dampening. Ductile iron is preferred for larger commercial and municipal sewer lines. Your choice should consider the pipe diameter needed, soil conditions, local code requirements, and budget.