A sewer backup happens when wastewater can’t flow out of the home and comes back up through drains, toilets, or tubs. It is often first noticed in the lowest drains, such as a basement floor drain.
Because sewage can carry bacteria and other germs, a backup is both a plumbing problem and a sanitation concern. Avoid contact with the wastewater, keep children and pets away, and stop using fixtures that drain into the system.
Common Causes of Sewer Backups
Backups can be caused by blockages in the main sewer line, tree root intrusion, damaged or collapsed pipes, and heavy rain that overwhelms drainage systems. Finding the cause helps determine the right repair.
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