What is a common cause of sewer line blockages?

Tree root intrusions or buildup of grease and debris is a common cause of sewer line blockages. Tree roots are naturally attracted to moisture and nutrients that can be found in sewer lines. When roots infiltrate the joints or cracks in the pipes, they can create a blockage by forming a dense mass that obstructs the flow of waste and water. This intrusion can be quite severe, leading to significant plumbing issues if not addressed.

Furthermore, grease and debris accumulation also plays a pivotal role in sewer line blockages. Grease can solidify as it cools, adhering to the walls of the pipes, while debris, such as food particles and other organic matter, can combine with the grease to form thicker blockages. Over time, these buildups can fully restrict water flow, resulting in backups and potentially causing serious plumbing emergencies.

The other options tend to contribute to sewer issues but are less common as direct causes of blockages compared to tree roots and the accumulation of grease and debris. Indentations or bends in the line may lead to issues but usually don't cause outright blockages, and while corrosion can affect pipe integrity, it's typically not a direct cause of immediate clogs in the way that roots and grease interference are. Insufficient slope in piping