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Repair guide · Easy · 20 minutes

Clogged Kitchen Sink: What to Try First

Most kitchen sink clogs sit within two feet of the drain: in the disposal or in the U-shaped trap under the sink. A plunger and a bucket clear them in about 20 minutes. Here is the order to try things in, why the bottle of drain cleaner should stay on the shelf, and how to tell when the clog is past your reach.

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Clogged Kitchen Sink: What to Try First

What You Need

Know These Before You Start

A double kitchen sink with one basin backed up
One side backed up: the clog is close
Plunging one basin while a wet rag seals the other drain
Plunge one side, seal the other
The P-trap under a kitchen sink with a bucket beneath it
The P-trap, with a bucket under it

The Fix, Step by Step

  1. Start with the disposal

    If one side has a disposal, run it with cold water for 30 seconds. A disposal packed with peels or rice is the most common kitchen clog, and running it often clears the sink on its own. If it hums instead of spinning, use our disposal guide first and come back.

  2. Plunge it the right way

    Seal the other basin's drain with a wet rag or stopper and hold it down, or the pressure escapes there. Leave an inch or two of water in the clogged side, set the cup plunger over the drain, and give it 15 to 20 firm strokes before pulling it off sharply. Try three rounds before moving on.

  3. Clean out the trap

    Put the bucket under the U-shaped trap, unscrew the two plastic slip nuts by hand, and drop the trap into the bucket. Clear it out, rinse it in the bucket (the sink is still clogged), and reinstall it hand-tight plus a quarter turn. Run water and watch the nuts for drips.

  4. Flush and keep it clear

    Once it drains, run hot tap water for a minute to carry the loosened grease down the line. From here on, wipe greasy pans into the trash and run cold water with the disposal. Grease poured down a drain hardens a few feet into the wall, which is where the next clog forms.

Why We Skip Chemical Drain Cleaners

Most kitchen clogs are grease and food packed together, and caustic cleaners rarely get through them. What usually happens is the chemical sits in the trap on top of the clog, heats up plastic pipe, and then splashes on whoever opens the trap next. If you have already poured some in, tell us when you call so the tech knows before taking anything apart. Boiling water is out too: it can soften PVC joints and crack a porcelain sink.

Stop and call us if: the trap is clean and the sink still backs up, both basins fill at once, the dishwasher backs up into the sink, or water comes up in another drain when you run the kitchen tap. Those mean the clog is in the line inside the wall or further down, past where a plunger reaches. A sink that clogs every few months has grease building up in that line, and clearing the full line fixes what plunging only postpones.

Plunged, cleaned the trap, and it's still slow?

Call and describe it. We will tell you what it likely is, what it usually involves, and how soon we can be there.

Related Guides & Services

What Customers Say About Paws Plumbing

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