When should I call a plumber for a clogged drain?
By the Drain Guru team · Updated September 27, 2026
Quick answer
Call a plumber when more than one drain is clogged at once, water backs up into the tub or shower when you flush, drains gurgle together, you smell sewage, or a floor drain or cleanout overflows. Those point to a main sewer line blockage (often roots or a collapsed pipe), which household tools can't reach.
Signs it's the main line
- Several drains are slow or clogged at the same time.
- Flushing the toilet makes water rise in the tub or shower.
- Drains gurgle when a different fixture runs.
- Sewage smell in the house or yard.
- Water comes up out of a basement floor drain.
- Your sewer cleanout cap is leaking or overflowing.
- The clog comes back within days of clearing it.
Signs it's a DIY job
- One fixture only: a single sink, tub or toilet.
- It drains slowly rather than not at all.
- You can point to a likely cause: hair, paper, grease.
For single-fixture clogs, a plunger, a drain snake or an air-pressure drain opener fixes most of them, usually in minutes.
More questions
What does a plumber do for a main line clog?
Usually a motorized drain auger or hydro-jetting through the cleanout, often with a camera inspection to check for roots or damaged pipe.
Related answers
General information only. Plumbing codes, prices and landlord-tenant laws vary by location. For gas, electrical, sewer-line or structural problems, contact a licensed professional.