Thread: Loud gurlging noises - sink/tub drainage

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I think gurgling is a sign of air being sucked into the drain which is a good thing. A drain that sits there and does not gurgle is stopped up.

When I hear gurgling, I think improper venting and that the weir is being sucked out of the trap. I recommend that a plumbing contractor should confirm venting or make the necessary corrections/repairs.

That's an indication of inadequate venting. That's not a good thing.

Ditto Gunnar and Bruce.

Venting issue, call the plumber. A properly venting system should be gurgle-free.