The answer to 'lifespan of drain' is that the average lifespan of a residential drain can vary widely, typically ranging from 15 to 50 years depending on several factors. Drains made of durable materials like cast iron or PVC can last 40-50 years with proper maintenance, while older metal drains like galvanized steel may only last 15-20 years before needing replacement. The lifespan is impacted by factors like water quality, usage, and any clogs or backups that occur over time.
Proper maintenance through regular cleaning and prompt repairs when issues arise can help extend the life of your home's drains. Calling a professional plumber for periodic inspections is also recommended to catch any developing problems before they become major issues.