Why Is My Sink Not Draining?

Quick answer

Slow or stopped drains often involve food debris, grease buildup, a clogged P-trap, vent issues, or main line problems. If only one sink is affected, the clog may be local. If several fixtures drain poorly, the problem may be deeper in the plumbing system.

Common causes

• Grease, food particles, or soap scum buildup in the drain line.
• A clogged or misaligned P-trap under the sink.
• Garbage disposal jam or improper use pushing solids into the line.
• Vent or main drain issues when multiple fixtures are slow.

What you can check first

1. Step 1

   Remove standing water and clear visible debris from the strainer.

2. Step 2

   Run hot water for a minute if grease may be involved (avoid boiling water on fragile pipes).

3. Step 3

   Check whether other sinks, tubs, or toilets drain normally.

4. Step 4

   If you have a disposal, confirm it runs and is not jammed.

Do not mix drain chemicals blindly or force tools into pipes if you are unsure. Chemical reactions and damaged traps can make repairs more expensive.

When to ask an expert

Contact a qualified plumber or home repair professional if water backs up into other fixtures, you smell sewage, snaking does not help, or the clog returns quickly. Licensed help is especially important when walls, floors, or main lines may be involved.

Important disclaimer

This guide is general information only. Plumbing work can affect safety, property damage, and code compliance. When in doubt, stop and ask a qualified local professional.