Why Your Sink Is Draining Slowly and How to Fix It

The bathroom sink is a plumbing fixture that sees a lot of wear and tear. Every day, we use it in some way. This makes it a real problem when it suddenly starts draining slowly. It can be a sign of big plumbing issues bubbling under the surface, and at the very least, is just a real hassle.

If left alone, things can worsen and even result in smelly odours, mould growth, and staining.

Figure out what might be causing this issue so you can try to remedy it. If the problem is too severe or complicated, it may be time to call a licensed plumber. Here are some of the common reasons and fixes for a sink that drains too slowly.

1. Clogging

Clogs are one of the most common causes of a slow-draining sink. If you don’t regularly clear the drain of hair, soap, and other debris, it can get tangled in the trap. This will block the opening and increase the amount of water you will need to pour down. 

Flush out the clog by pouring a pot of boiling water down the drain. You can also pour a mixture of water and vinegar. Once the clog has been removed, the sink should flow freely again. However, you should make sure to clean out the drain regularly so that it doesn’t clog up again.

2. Worn Out P-Trap

The P-trap is a U-shaped pipe that is used to prevent smells from leaking out of the sink. This can also lead to a slow-draining sink because it can wear out over time and capture debris. Luckily, it’s easy to replace a worn-out one. 

In some cases, you don’t even need to get a replacement. You just need to take it out and clean it thoroughly.

3. Root Growth

If you have a slow-draining sink, you may have a tree root problem. This can happen if the drain line runs through the area where roots can get in. Over time, they can grow into the drain and cause a blockage.

This can happen in the floor drain, as well. Roots can also get in through cracks and move through the line to the sink. If you notice that the drain is slow, you can try cleaning it out.

Roots that cause big blockages can be costly if you try to fix the issue on your own, so it’s best to consult a professional.

4. Broken or Worn Pipes

Some of the plumbing in your home may be older and could be the cause of a slow-draining sink. If you notice that the drain is clogged, you may want to check the pipes. One leak or a broken pipe can cause water to back up into the sink and make it very slow to drain.

You may also be facing build-up because the plumbing isn’t as efficient anymore. Get it checked to see if a minor fix can do the trick or if you need more thorough repairs.


It can be very frustrating when your sink begins to drain slowly. Sometimes, all it may take is a quick fix to get it to drain normally again. However, you may need to call a licensed plumber if you don’t know what is causing the problem. The next time you notice that your sink is draining slowly, try to determine what is causing the problem so that you don’t have a bigger headache. 

For quick and reliable plumbing services near Abbotsford, BC, Bromac Mechanical has you covered. We are open 24 hours and go above and beyond to serve our customers. Contact us today!

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