Tree Roots in Sewer Lines: Signs, Inspections, Repairs Tree roots are a common cause of sewer line problems in older homes and neighborhoods, especially where mature trees sit near buried pipes. While roots may initially enter through tiny cracks or weak joints, they can grow over time, forming blockages that restrict flow. When a sewer line is affected, homeowners often notice symptoms first—sometimes long before a complete blockage occurs. Early recognition can reduce the risk of sewage backups, odors, and emergency repairs. Warning signs of root intrusion Clues that tree roots may be invading a sewer line include recurring or persistent clogs, especially in the same location. You may also notice slow drains across multiple fixtures, gurgling sounds from toilets or sinks, or foul odors near drains or cleanouts. In some cases, toilets back up during heavy rainfall or after water use spikes, suggesting the line is partially restricted. ... Read more »