How to Unclog a Kitchen Sink Drain (and When to Call a Pro)

A kitchen sink that drains slowly — or not at all — is one of the most common calls we get in Calgary. The good news: most kitchen clogs sit in the first few feet of pipe and you can clear them yourself in under half an hour. Here's how, in the order a pro would actually try them.

Before you start, skip the chemical drain cleaner. It rarely clears a full grease clog, it can sit in the pipe and damage older fittings, and it makes the job hazardous for anyone who opens the trap afterward.

Start with the easy wins

1. Boiling water. Kitchen clogs are usually grease, soap, and food softened into a plug. Bring a kettle to a boil and pour it down in two or three stages, a few seconds apart, to let the heat work. If the water starts draining faster, you're on the right track — repeat once more.

2. Clear the basket and standing water. Pull out the sink strainer and scoop out any standing water so you're working on the clog, not a full basin. Check the strainer itself isn't the whole problem.

3. Plunge it. A flat-bottomed sink plunger works well here. If you have a double sink, stuff a wet rag tightly into the other drain first — otherwise you just push air back and forth. Cover the drain, add enough water to seal the cup, and give it 6–8 firm pumps.

Open the P-trap

If plunging doesn't do it, the clog is likely sitting in the P-trap — the U-shaped pipe under the sink that catches everything.

• Put a bucket and some towels underneath. It will hold dirty water.
• Unscrew the two slip nuts by hand (or with channel-lock pliers) and lower the trap.
• Clear out the gunk, rinse the trap, and check the arm that goes into the wall.
• Reassemble, then run warm water and watch the joints for drips.

Nine times out of ten in a kitchen, the clog is right here.

When it's time to call a pro in Calgary

A few signs mean the blockage is further down the line than a DIY fix can reach — and worth a professional with a proper drain auger:

• The clog comes back within a day or two of clearing it.
• More than one fixture backs up at once (sink and dishwasher, or a gurgle in another drain). That points to the main line.
• Water backs up out of another drain when you run the sink.
• You can smell sewer gas or see dark water rising.

Those are signals the issue is past the trap, and snaking it blind can pack the clog tighter or damage the pipe. In older Calgary homes — the established inner-city streets in particular — aging cast-iron lines scale up inside, so a clog that keeps returning often points to the pipe itself rather than what you put down it.

Quick tip to prevent the next one: wipe grease into the garbage before it goes down the sink, and run hot water for 10 seconds after washing oily pans. Grease is the number-one repeat offender in Calgary kitchens.

If you'd rather not pull the trap apart — or it's already come back — YOFF handles drain cleaning across Calgary and nearby communities. We clear it, test it, and you only pay if we fix it. Get a free quote or call us and we'll take a look.