What usually causes it
- Tree roots filling the sewer lateral
- A collapsed, cracked or offset section of old pipe
- Grease and buildup narrowing the line until it closes
- Items flushed that do not break down
- A city main problem during heavy storms (less common, but possible)
What you can safely check
- Stop all water use in the house — no flushing, no laundry, no dishwasher
- Keep people and pets away from the affected water; treat it as contaminated
- If the backup followed heavy rain, note that — it helps the diagnosis
- Do not pour chemical drain cleaner into a backup
When to call a plumber
Call right away — sewer backups do not improve on their own, and the next fixture used makes it worse. We clear the line if it is intact, then run a camera to show you why it backed up. If the line is damaged, you will see the damage yourself and we will discuss repair options with the evidence on the screen.
The service that usually handles this: Sewer Repair. We handle sewer backup calls across White Plains and Westchester County — including White Plains, Scarsdale and Yonkers.
Questions about sewer backup
Is a sewer backup dangerous?
The water can carry bacteria and should be treated as a health hazard — keep contact minimal, ventilate, and plan on proper cleaning and disinfection of affected surfaces after the line is fixed.
Will it happen again after it is cleared?
If the cause was a one-time blockage, maybe not. If the cause is roots or a damaged pipe — which the camera will show — it will return on a schedule until the underlying problem is addressed. Jetting slows root regrowth; a damaged section needs repair.