What are the common causes of a sewer line backup?

The common causes of a sewer line backup are blockages from waste and grease, tree-root intrusion, pipe damage or sagging, and heavy inflow that overwhelms the line. Most backups start with non-dissolving items and fats that coat the pipe, then trap more debris until flow stops. A quick video camera inspection identifies whether you’re dealing with a clog, roots, or a broken or bellied section. Technicians in our area regularly solve these issues using non-invasive diagnostics before deciding on cleaning, spot repair, or replacement. If sewage is coming up through drains or toilets, treat it as an urgent situation.

Typical triggers we find during inspections:

• Wipes, paper towels, hygiene products, or cat litter that don’t break down
• Grease, oils, and food scraps that harden and narrow the pipe
• Tree roots entering through joints or small cracks
• Bellied, sagging, or offset sections from soil movement
• Collapsed or deteriorated pipe materials causing obstructions
• Rain or groundwater infiltrating through defects, overloading the line

If you notice gurgling fixtures or repeat clogs, limit water use and schedule a camera inspection before more damage occurs. <br/> Updated: 2026-05-07 <br/> Need help in West Lafayette, IN? Call (765) 262-5364 or book online.