What are the common causes of a sewer line backup?

The common causes of a sewer line backup are tree-root intrusion, grease and “flushable” wipes buildup, pipe breaks or bellies (low spots), and stormwater overloading the line. Most backups start with fats, oils, and wipes that harden and catch debris until flow stops. Camera inspections often expose a hidden belly where sludge sits and re-clogs after every quick snake.

In the Denver area, including Centennial, we frequently confirm issues with state-of-the-art video inspection and clear tough obstructions with hydro jetting or plan trenchless repair when excavation isn’t ideal.

Call a pro promptly if you notice any of these decision signals:

• More than one fixture backing up at the same time
• Gurgling at the lowest drain or toilet after using water
• Sewage odors indoors or overflow at the cleanout
• Backups that return soon after snaking

If sewage is present, stop water use and book a camera inspection before the next flush. <br/> Updated: 2026-04-26 <br/> Need help in Centennial, CO? Call (720) 577-4266 or book online.