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Fix a kitchen sink drain that is clogged

We'll clean the P-trap, snake the drain, and clear the disposal if present—to remove grease and food—or tell you when to call a plumber.

Troubleshooting · Home plumbing
15–30 min
What you'll need
  • Cup plunger (not flange—for flat drains)
  • Bucket, channel-lock pliers (for P-trap)
  • Drain snake (hand-crank)
  • Baking soda and white vinegar
  • Hex key (if you have a disposal—usually included)
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Steps

Goal: Confirm the kitchen sink drain is clogged, then clear grease and food buildup.

  • Run the faucet at full flow for 30 seconds. Check that water pools in the sink or drains very slowly.
  • Good: Water pools or drains slowly—clogged. Proceed to Clean the P-trap.
  • Bad: Water drains freely—no clog. Check another fixture or see How to unclog a drain for general drain clearing.

Plunger and hot water

Goal: Try a plunger and hot water before cleaning the P-trap.

  • Use a cup plunger—not a flange plunger—for the flat sink drain. If you have a double sink, block the other drain with a wet cloth.
  • Fill the sink with enough water to cover the rubber cup. Press the plunger down to form a seal and pump firmly 10–15 times.
  • Or pour very hot tap water into the drain (for PVC pipes, do not use boiling). Or pour half a cup of baking soda, then half a cup of vinegar, wait 15–20 minutes, flush with hot water.
  • Good: Drain clears. Proceed to Verification.
  • Bad: No change—proceed to Clean the P-trap.

Clean the P-trap

Goal: Clear grease and food from the P-trap (the U-shaped pipe under the sink).

  • Place a bucket under the P-trap. Unscrew the slip nuts on both ends by hand or with channel-lock pliers.
  • When the trap drops free, dump its contents into the bucket. Look through the trap and pipe stubs—you should see daylight or light from the other end.
  • Reassemble finger-tight, then snug a quarter turn with pliers. Run water and verify the drain flows.
  • Good: Water drains; no drips at the slip nuts. Proceed to Verification.
  • Bad: Water still pools—proceed to Snake the drain.

Snake the drain

Goal: Break through clogs deeper in the pipe with a drain snake.

  • Feed a hand-crank drain snake into the drain opening—past the disposal if present—until you feel resistance.
  • Crank the handle clockwise to bore through or hook the clog. When the snake moves freely, pull it back slowly. Run water and verify the drain flows at full speed.
  • Good: Drain flows at full speed. Proceed to Verification.
  • Bad: Snake hits a hard stop—stop. That could be a pipe fitting. See When to get help.

Clear the disposal

Goal: If you have a disposal that hums but does not grind, clear the jam before or after drain work.

  • Shut off power to the disposal. Press the red reset button on the bottom.
  • Insert the hex key into the hole on the bottom and turn it back and forth to rotate the impellers and clear any jam.
  • Restore power. Run cold water and the disposal to flush debris. Check that water drains when the disposal runs.
  • Good: Disposal grinds and drains freely. Proceed to Verification.
  • Bad: Disposal still hums or does not respond—see Fix a garbage disposal that is clogged or Fix a garbage disposal that hums.

When to get help

Call a plumber if:

  • The snake hits a hard stop that will not budge (could be a pipe fitting or main-line blockage).
  • Water backs up from multiple fixtures (e.g. bathroom sink, toilet) when you run the kitchen sink.
  • You smell sewage (possible main-line or vent issue).

A plumber has longer snakes and can scope the pipe to locate the problem. For disposal issues, see Fix a garbage disposal that is clogged. For other plumbing fixes, see Fix a leaking faucet or Fix a toilet that runs.

Verification

  • Run the faucet at full flow for 60 seconds. Water should drain without pooling.
  • If you have a disposal, run it with cold water and confirm water drains.
  • Check for drips at the P-trap connections. Repeat the flow test after 24 hours to confirm the clog has not reformed.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Verify the kitchen sink drain is blocked or drains slowly; rule out a disposal jam.
  2. Plunger and hot water Try a plunger, then hot water or baking soda and vinegar.
  3. Clean the P-trap Remove the P-trap and clear grease and food.
  4. Snake and disposal Snake the drain; if disposal present, clear any jam and run it with cold water.
  5. Call a plumber Snake hits hard stop, multiple fixtures back up, or sewage smell—call a plumber.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Whether you have a disposal
  • Whether cleaning the P-trap helped
  • Snake results (debris pulled out or hard stop)
  • Steps already tried

Is the kitchen sink drain blocked or draining slowly?

Run the faucet for 30 seconds. If water pools or drains very slowly, the drain is clogged.

Run the faucet at full flow for 30 seconds. If you have a disposal, run it with cold water. Good: water pools or drains slowly—clogged. Bad: water drains freely—no clog.

Yes No

You can change your answer later.

Do you have a disposal that hums but does not grind?

A jam can block the drain. Clear it with the hex key before working on the drain.

If the disposal hums but does not grind, shut off power and press the reset button. Use the hex key to turn the impellers and clear the jam. If it runs normally after that, run cold water and check the drain. Good: disposal runs and drain clears—or no disposal. Bad: disposal still jammed—see fix-garbage-disposal-is-clogged or fix-garbage-disposal-hums.
Question

Is the disposal jammed?

Continue

You can change your answer later.

Did cleaning the P-trap clear the drain?

Place a bucket under the P-trap. Unscrew slip nuts, remove trap, clear debris.

Place a bucket under the P-trap. Unscrew the slip nuts and remove the trap. Dump contents, check that pipes are clear. Reassemble. Run water. Good: drain flows. Bad: still clogged—try plunger, then snake.

Yes No

You can change your answer later.

Did the drain snake clear the clog?

Feed the snake past the disposal if present until resistance.

Feed a drain snake into the drain opening until you feel resistance. Crank clockwise to bore through or hook the clog. Pull back slowly. Run water. Good: drain flows at full speed. Bad: snake hits hard stop or still clogged—call a plumber.

Yes No

You can change your answer later.

Drain is clear

Water drains freely. Run cold water when using the disposal. Avoid pouring grease down the drain. Install a mesh strainer to catch food.

Done

Call a plumber

Call a plumber if: the snake hits a hard stop; water backs up from multiple fixtures; or you smell sewage. Those suggest a main-line blockage.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why do kitchen sink drains clog?
Grease and food are the main causes. Grease solidifies in the pipes; food particles stick to it. The P-trap and the pipe just past it often collect the buildup. Cleaning the P-trap and snaking usually clears it.
Can I use chemical drain cleaner in a kitchen sink?
Avoid harsh chemical drain cleaners—they can damage PVC pipes and disposal seals. Use baking soda and vinegar, a plunger, or a drain snake instead. Never pour bleach or harsh chemicals into a disposal.
When should I call a plumber for a clogged kitchen sink?
Call a plumber if the snake hits a hard stop that will not budge, water backs up from multiple fixtures, or you smell sewage. Those suggest a main-line blockage.

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