The answer to 'when to replace sewer line' is that homeowners should consider replacing their sewer line if it is over 40-50 years old, shows signs of damage or deterioration, or is experiencing frequent clogs or backups. Older sewer lines made of materials like clay or cast iron can become cracked, corroded, or collapsed over time, leading to leaks, clogs, and even sinkholes.
Replacing a sewer line is a major project, but it's often necessary to prevent further damage and costly repairs down the line. Homeowners should watch for warning signs like slow draining, gurgling sounds, and sewage backups, and call a professional plumber to inspect the line and recommend the best course of action.