Kitchen Sink Clogged? What to Do Before You Call a Plumber

Of all the drains in a house, the kitchen sink takes the most abuse. Cooking oil, coffee grounds, rice, pasta and small food scraps all end up in the same pipe, and over time they build a clog that holds water in the basin. The good news is that kitchen clogs are among the easiest to clear. This guide shows you how, and explains when to hand the job to a pro.

Why Kitchen Sinks Clog

Grease is the main cause. Hot cooking oil is liquid in the sink, then cools in the pipe and sticks to the wall, where it catches food particles. Over weeks, the layer thickens. Garbage disposals grind scraps small, but they do not stop the particles from settling in the line.

Step 1: Figure Out Whether You Have a Single or Double Sink Clog

If water backs up into the second basin when you drain the first, the blockage is past the Y-fitting under the sink, in the shared line. If only one basin is blocked, the problem is in that basin's trap or tailpiece. This shortcut saves time and tells you where to work.

Step 2: Try a Plunger

Use a cup plunger, not the flange type used for toilets. If you have a double sink, block the second drain with a wet rag so pressure goes to the clog. Fill the basin with enough water to cover the plunger cup, then push and pull firmly for twenty to thirty seconds. If the sink starts to drain, run hot water to flush the remainder.

Step 3: Use Hot Water and Dish Soap on Grease Clogs

Pour a generous squirt of dish soap into the drain, then add a kettle of very hot water in two or three batches. The soap helps break the grease and the hot water carries it away. This works best on partial clogs, where water still moves slowly.

Step 4: Clean the P-Trap

The P-trap is the U-shaped pipe under the sink. It is the most common spot for a kitchen clog. Place a bucket underneath, loosen the slip nuts by hand or with pliers and remove the trap. Empty it into the bucket, rinse it, check that the rubber washers are seated and put it back. Run water and check for leaks.

Step 5: Snake the Line

If the trap is clear and the sink still holds water, feed a small drain snake into the wall pipe. Turn the handle as you push and pull to break up or hook the clog. A snake clears the section of line between the trap and the main stack.

Garbage Disposal Clogs

If the disposal hums but does not spin, switch it off and use the hex socket at the bottom to free it. Then press the reset button on the underside. Never put your hand in the disposal. If the sink drains slowly even with a working disposal, the blockage is beyond it.

What Not to Put Down a Kitchen Drain

• Cooking oil, bacon grease and fat.
• Coffee grounds.
• Eggshells.
• Rice, pasta and other starches that swell in water.
• Fibrous vegetable scraps such as celery or corn husks.
• Flour and baking mixes.

When to Call a Professional

Call a plumber if the clog returns within days, if more than one fixture is affected, if you smell sewage or if you have tried plunging, trap cleaning and snaking without success. A professional can clear the line with a motorized cable or hydro jetter and check the pipe with a camera. See our kitchen sink drain clog service for same-day help across Texas.

Frequently Asked Questions

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