Sink overflowing

PlumbingUpdated March 2026

The answer to a sink overflowing is that there is likely a clog or blockage in the sink drain or the drain pipe. This can cause water to back up and overflow the sink.

Common causes of a sink overflowing include food debris, hair, soap scum, and other materials building up in the drain. Symptoms include the sink filling up with water slowly when draining, gurgling sounds, or water overflowing the sink basin. Solutions can include using a plunger, a drain snake or auger, or chemical drain cleaners to clear the clog. If the clog is severe or the issue persists, it's best to call a professional plumber to inspect and fix the problem.

Sources

Plumbing & Mechanical Magazine— authority

International Association of Plumbing and Mechanical Officials (IAPMO)— authority

This Old House— guide

Step-by-Step Guide

1
Use a Plunger
Place the plunger over the drain opening and plunge up and down firmly several times to try to dislodge the clog.
2
Use a Drain Snake
If the plunger doesn't work, use a drain snake or auger to manually remove the clog from the drain pipe.

Frequently Asked Questions

How do I prevent my sink from overflowing?

To prevent sink overflows, be sure to regularly clean and maintain the sink drain by removing hair, food, and other debris. Use a drain cover or strainer to catch larger items.

What should I do if my sink starts overflowing?

If your sink starts overflowing, first try using a plunger to dislodge the clog. If that doesn't work, you may need to use a drain snake or call a professional plumber to inspect and clear the drain.

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