Sewer Backup in Basement: Causes, Cleanup & Repair

Sewage backing up into your basement is a health emergency. Here’s what causes it, how to stop it, and how to prevent it from happening again.

Call 610-803-6851 or text 855-DONT-DIG

Why Sewage Backs Up Into Basements

1. Main Sewer Line Blockage (Most Common)

Tree roots, grease, or foreign objects block the main sewer line. When you flush upstairs, sewage has nowhere to go except the lowest point: your basement floor drain or toilet.

2. Collapsed Sewer Pipe

Old cast iron or clay pipes collapse, completely blocking flow. All drains back up into the basement.

3. Municipal Sewer Line Backup

City sewer main backs up during heavy rain, pushing sewage back into your house through the floor drain.

Immediate Steps When Sewage Backs Up

1. Stop using water — Don’t flush toilets, run sinks, or use washing machine
2. Turn off water to washing machine if it’s running
3. Call emergency plumber — 610-803-6851 (24/7)
4. Stay out of basement — Raw sewage contains bacteria (E. coli, hepatitis)
5. Ventilate — Open basement windows if safe to do so

How We Fix Basement Sewer Backups

Emergency Clearing ($350-650)

Hydro jetting or snaking to clear the blockage and restore flow immediately.

Permanent Repair ($3,500-$15,000)

• CIPP lining if pipe is cracked but not collapsed
• Pipe bursting if pipe is collapsed
• Backwater valve installation ($800-1,200) to prevent city sewer backups

Cleanup After Sewage Backup

DO NOT clean it yourself — Raw sewage requires professional cleanup:

• Remove contaminated materials (drywall, carpet, insulation)
• Disinfect all surfaces with antimicrobial solution
• Dry basement completely (prevent mold)
• Air quality testing

Cost: $2,000-$8,000 (often covered by homeowners insurance water backup rider)

Emergency sewer backup? Call 610-803-6851 NOW

Service Area

Havertown |
Upper Darby |
Springfield |
Media |
All Delaware County