The answer to 'how to maintain sewer line' is to regularly inspect, clean, and repair your sewer line to prevent clogs, backups, and damage. This includes using a sewer snake or hydro-jetting to clear blockages, addressing tree root intrusion, and repairing cracks or breaks in the pipe.
It's recommended to have your sewer line inspected and cleaned every 1-2 years, or more frequently if you have recurring issues. Signs that your sewer line needs attention include slow drains, gurgling sounds, or sewage backups. If you experience a major blockage or damage, it's best to call a professional plumber to properly diagnose and fix the problem.