In general, bathroom sinks are easy to clean and maintain. All that homeowners need to do is ensure that they will not get anything flushed down the sink drain no matter what happens. However, there are instances where hair strands, scum buildup, or other materials get stuck in the pipes. As a result, clogging occurs, resulting in an overflowing sink. But what are the common reasons why a bathroom sink clogs? Here are some examples.

1. It Lacks a Stopper

If you do not have a stopper in your sink, the water in it can overflow once the water gets too much, or if you let the water run while the plug is not in place. To prevent clogging, you need to make sure that you place a stopper in the sink whenever you are not using it. If you have a sink that does not have a plug, use a rubber stopper or a wooden one.

2. A Curved Drain Pipe 

If you use a toilet, shower, or bathroom sink with a curved drain pipe and small bends and curves, the drain pipe can get clogged over time. The reason clogging happens is that the inner curves and arches of the line cannot be cleaned thoroughly.

A curved drain pipe is a common problem in a bathroom sink because the line is harder to clean and maintain. In effect, hair strands and other materials often get stuck in the pipe and clog it. As a result, it overflows. The best solution for the issue is to switch to a straight line. If not, the best option is to clean the curved pipe regularly.

3. Low Water Pressure

Another common problem with bathroom sinks is weak water pressure. It can also cause the sink to overflow. Usually, water pressure is low if you have an older water system or pipes located far from the water supply. To avoid this problem, you can purchase a water pressure regulator and install it in the lines to ensure that water flow will go smoothly. 

4. Wet Hair

Wet hair is a common reason why bathroom sinks overflow. The wet strands of hair get stuck on the sink, and they clog it. Once the sink gets clogged, the water cannot go down the drain. A way to prevent this problem is to make sure that you use a rubber drain stopper to avoid hair strands and other materials from getting into the drain. You also need to use chemical drain cleaners to remove hair strands and gunk.

5. Clogged Sewer Line 

If you have a bathroom sink and shower that share the same drainpipe, the drainpipe may eventually get clogged and cause an overflow. The problem stems from the sink and shower drainpipe going through the sewer line instead of directly to the sewer line. If a clog happens in the drainpipe, the water cannot go through, back up into the bathroom sink.


It is never fun when your bathroom sink overflows and results in floods on the floor. Therefore, it is essential to know the common causes of bathroom sink clogging to prevent future problems. But the best solution is to make sure that you will use the proper drain stopper to avoid bathroom sink clogging. It will also be best to clean the pipe regularly or have an expert check it out.

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