How to Fix a Gurgling Bathroom Sink?

Ever heard a gurgling sound coming from your bathroom sink? You hear one of those sounds while looking into the drain hole and wonder what’s going on. Then, before you know it, the sound has turned into a waterfall of bubbles — and the last thing you want to see is an overflowing sink with water drenching your floor.

If you’re interested in getting your plumbing to be quieter and more efficient, this article will go through some methods to fix a gurgling bathroom sinks.

How to Fix a Gurgling Bathroom Sink

Most likely, the gurgling is caused by your sink trap being filled with water. Unfortunately, this water cannot drain out of the sink, so you risk having a waterfall or a flooded bathroom.

If this is the case, try this fix:

  1. Simply turn off the faucet and let your water drain out – it will probably take 5-10 minutes. 
  2. When no more stream is coming from your faucet, take a wrench and disconnect your P-trap from your drain pipe (this may take some twisting/turning/removing).  
  3. To fix a gurgling sink drain, you must figure out exactly where the water is coming from. To do so, follow the instructions below: 
  4. Turn off your faucet. Turn on your bathroom light and grab a flashlight. Shine the light down into your sink drain pipe and look for any hair or other types of debris that may be obstructing the water flow. If you see anything causing a clog, try using some Krazy Glue (available in any hardware store) to close up any small openings you find.

Is A Gurgling Sink Dangerous?

If you have a gurgling or rumbling sink, it’s not unusual.

Many people seem to think it’s a sign of something more serious, but that’s not always the case.

ix a Gurgling Bathroom Sink

But if you have an old house, then chances were some time ago, someone put in a cold water pipe that extends down from the faucet supply line below your sink and hooks up with your drainpipe (in other words, no matter what you do with your hot water supply, it will still pour out at least some cold water).

Rumbling sinks are solved in many ways.

You can purchase a sink pipe gasket, which will let the water still at least fifty degrees below freezing out of your hot water supply line and fill it with a bucket of boiling water to freeze. Or you can work on the drainpipe under your sink—it’s not that hard to fix.

Can a Sink Drain Get Air Locked?

Did you know that a sink can get air locked? This can happen when a drainpipe clog causes trapped water to back into the sink. As water levels rise, so does the pressure- it will eventually get so high that it forces air out of the pipe and up into your house’s drains, causing them to overflow too. 

What does a gurgling sink mean

It sounds like a hypothetical problem, but it can happen anytime a sink fills with water faster than our drainage pipes can accommodate- for example, when someone flushes their toilet and sends gallons of dirty sludge into your home’s plumbing pipes.

For those of you who haven’t heard of this problem, or for the few of you who think it’s unbelievable, here’s what happened to me. Let me tell you how.

Why is My Bathroom Sink Drain Gurgling?

When you open a drain or flush a toilet, water usually enters the waste pipe and, as it fills the pipe, pushes air in front of it to create a vacuum effect.

The vacuum effect pushes the water into and out of the trap. You can hear air moving through the water that is still in the sink or the bottom of the trap. The gurgling sound is made when air and water combine.

How Much Does It Cost To Clear A Plumbing Vent?

Cleaning plumbing vents often costs between $100 and $200.

Bad odors, poor drainage, gurgling noises, or when someone flushes one sink and another makes noise are indications that stacks aren’t venting. Debris won’t clog the vent pipe if there is an open cover or screen.

What Causes Drain Gurgling? 

When a blockage forms in the pipes or drains, some air is trapped around it, creating an air pocket.

The air pockets or bubbles that are forcing their way up through the pipe along with the water are what is causing the gurgling sound.

sink gurgles but drains fine

Below are all possible causes in detail. 

1- Blocked Drain Line 

A clog in your drain pipe can cause a loud gurgling sound. By counting the number of gurgling drains, you can determine exactly where the blockage is located.

When the noise originates from a single drain, the cause is immediately apparent. However, the issue is in the main sewer line if the kitchen sink gurgles when you open a bathroom faucet.

All drain systems have roof-mounted ventilation pipes separate from the water pipeline. The gasses and extra air in the sewage line escape the vents through these airways.

Sometimes rats or birds build nests in ventilation pipes, which they then obstruct with twigs and feathers. As a result, the air from the airway cannot exit and becomes stuck inside the pipes, leaving through your drains.

We discovered that different gurgling sounds could be associated with partial or complete blockages in drain lines. By distinguishing between the two, you can proceed with the appropriate action.

2- Blocked Or Damaged P-Trap 

A P-trap keeps the gas from escaping through the drains and rids your home of unpleasant odors.

But, first, let me explain what a P-trap is for those unfamiliar with it:

A P-trap is a U-shaped pipe found underneath the sink and holds water. It produces a water seal that acts as a wall against foul gasses.

Have you ever noticed how your toilet or sink occasionally emits a foul ammonia odor? When the P-trap is destroyed or improperly placed, this occurs.

If your drain is gurgling, pay attention to odors when using the sink or flushing the toilet. If it is unusually foul, then consider checking or replacing your P-trap.

3- Clogged Vent System 

Your home has a vent system connecting all fixtures, allowing for smooth airflow without disturbing the drain pipes.

The vents are narrow constructions that protrude from the ceiling near your kitchen or bathroom, making them easy to differentiate from the usual drain pipes.

They frequently induce gurgling since they are open-ended and collect detritus. In addition, the air will rush back through the water outlets if the vent pipe becomes blocked, making it impossible to exit the system completely.

Therefore, before calling a plumber if your drain makes any strange noises, check the vents for any obvious indicators of obstruction. You’ll save a tonne of time and money this way.

4- Partially Blocked Drain 

The water will flow slowly and with low pressure when there is a partial obstruction, and the drain will begin to gurgle.

By quickly utilizing a drain cleaner to clean the drain, you can prevent it from being completely blocked.


How do you clean a foul p-trap?

Pour half a gallon of water into a dry p-trap to repair the barrier and eliminate aromas from it. In addition, it will stop the smells from leaking down the drain. Using a cup of white vinegar bleach is another useful technique to get rid of larvae and slow the evaporation.

Why does the dishwasher empty while my sink gurgles?

Gurgling in the drains indicates that there is a partial or complete blockage in one of the pipes, either in the secondary lines or the main sewer line. In either case, this obstruction may stop water from your drains from freely flowing through your pipes.

Is it okay to dump bleach down the drain?

Your septic system could sustain long-lasting harm. When cleaning agents and bleach are combined, hazardous fumes are produced. If you pour bleach and other cleaning products down your sink drains and combine them in your pipes, the gas produced may contaminate the air in your home.

Why do my sinks have a sewer-like odor?

If your sink drain smells like a sewer, it generally has venting issues. However, a rancid stench could also be the result of debris in the P.trap. Flushing a toilet can generate enough vacuum to draw water out of the trap and release sewer gasses into your home when the vents are clogged.


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