Clogged Drain or Sewer Problem? How to Tell

Signs it’s a single-fixture clog

• Only one sink, tub, or shower drains slowly — everything else runs fine.
• The problem started gradually (hair, soap scum, and grease build up over weeks).
• Plunging or clearing the trap under the sink helps, at least temporarily.

Signs it’s the main sewer line

• Multiple drains back up at the same time — especially the lowest ones in the house.
• Water backs up in a tub or shower when you flush the toilet.
• You hear gurgling from other fixtures when one is draining.
• There’s a sewer smell indoors or standing water near a cleanout outside.

What NOT to do

Skip the chemical drain openers on a suspected sewer problem. They can’t clear roots or a collapsed line, they sit in the pipe as a caustic hazard for whoever works on it next, and repeated use damages older pipes.

What a pro does differently

A plumber clears a fixture clog mechanically with an auger, and diagnoses a main-line problem with a camera inspection — actually seeing whether it’s roots, grease, a sag, or a break before recommending anything. That’s the difference between guessing and knowing.