Main line replacement may be necessary when a sewer line has extensive cracks, collapsed sections, severe corrosion, persistent root intrusion, or recurring blockages that cannot be resolved with drain cleaning or hydro jetting. Frequent sewer backups, slow drainage throughout the property, sewage odors, and repeated sewer repairs can also indicate a failing main line. A sewer camera inspection and line locating can help identify the condition and location of the problem before replacement work begins.