When Should You Call a Plumber for a Slow Drain?

Plenty of slow drains are solved with a plunger and ten minutes under the sink. The point of calling is when the symptom keeps returning or spreads beyond one fixture.

Worth trying yourself

Cleaning the stopper assembly, removing and clearing the trap, and plunging with the overflow covered address most single-fixture slowdowns caused by material near the opening.

Time to call

When flow does not return after those steps, when the same drain slows repeatedly, when a second fixture starts draining slowly, or when water backs up at a floor drain.

Call rather than wait

If water is rising onto a floor, or wastewater is appearing in a basement, that is not a slow drain any more — it is a drainage failure worth treating as urgent.