Toilet Bubbling When Washer Drains-Quick Troubleshooting

Toilet bubbling when washer drain is a common problem experienced by many people. On most occasions, the toilet bubbling when the washer drains result from air trapped in the toilet draining pipes and cannot get out of the pipes. As the air tries finding an escape path, it moves backward and forward, resulting in bubbles in the toilet washer drains.

Sometimes, toilet bubbling when washer drains can be caused by several reasons which need instant fixation. For instance, toilet vents may be clogged hence preventing air from escaping. The negative pressure built up by the clogged vents forces air to escape through the bowel resulting in the production of bubbling sound.

Causes of toilet bubbling when the washer drains and how to troubleshoot the problems

Several reasons can result in your toilet producing a bubbling sound. Before fixing the problems, ensure you inspect all toilet parts keenly. The reasons include the following;

  • Clogged draining pipe

Clogged draining pipes are the common cause of bubbling sound when the washer drains. Materials flushed down the toilet such as oil condense and block the pipes preventing the continuous flow of water and air out of the toilet.

Once the draining pipes are blocked, a negative pressure is created, which forces air spaces to get out of the bowl. As a result, the air spaces are forced to flow continuously, creating bubbles. After the bubbles have been created, a gurgling sound is produced accompanying the bubbles.

Draining pipes are fixed using an auger tool to pull all materials that have clogged the pipe. Sometimes your draining pipe may be damaged and requires replacement. Buy a draining pipe that fits your toilet perfectly, and try replacing the draining pipe by following the recommended steps. If the problem persists, consult a plumber to help you fix the problem.

  • The Toilet washer drain fails to function

First, check your toilet washer drain if it is working as required. When your toilet washer drain fails to function, negative pressure is created, resulting in the production of many air spaces, which produces a bubbling sound.

Once your toilet washer drain fails to function, inspect the washer carefully to identify why your toilet washer drain fails to function. Adjust the toilet washer drain to the correct size, length and diameter. After making the adjustments, test your toilet washer drain to see if the issue has been correctly solved. If the problem persists, consult a licensed plumber to help you fix the problem.

  • Damaged toilet tank

The toilet tank located on top of the toilet bowl can fail to work as required. If the toilet tank fails to function as required, air spaces get trapped in the toilet tank, resulting in a bubbling sound.

A faulty toilet tank equipment is only fixed by replacing the tank with the new one. Buy a toilet tank that suits your toilet and the sewer. Finally, but a toilet tank that is relatively cheap and affordable.

  • Sewer pipe clogged

Inspect your sewer pipe carefully and see if it is clogged. Clogging of the sewer pipelines prevents water from flowing to the sewer hence creating unnecessary pressure, which forces air spaces to get out of the sewer pipes. Air spaces trapped in the sewer pipe move continuously in the sewer pipelines to look for a place to move out, and in turn, they generate bubbles which produce bubbling sound. Sewer pipes are mostly blocked due to damaged pipes.

Sewer pipe blocked can be fixed by using the following steps. First, check the sewer pipes if they are damaged. If the sewer pipes are damaged beyond repair, consider replacing the sewer pipes. If you can fix the clogged pipes, it is advisable to use a plunging snake to pull out all materials that have clogged the sewer pipe.

Moreover, ensure you handle the sewer pipes slowly and correctly to avoid damaging the sewer pipes further. Also, ensure you follow the manufacturer’s instructions concerning sewer pipes. Finally, consult a professional plumber to help you fix the problem.

  • The whole toilet blocksThe whole toilet blocks

Sometimes, the toilet bubbling sound produced can be a result of a blocking toilet. First, inspect the whole toilet, especially the part consisting of the bowl. If it is blocked, try to unblock it and see if the problem is solved. Ensure you don’t flush large objects such as small animals down the toilet to avoid blocking the toilet.

To fix the blocked toilet, first, inspect all parts to ensure that they are sealed correctly. Sealing ensures that air is a force out of the toilet down the toilet drain pipes. It is advisable to use a plunge. But, if the plunger fails to function as required, you will need another method to unblock your toilet. For instance, you can use a drilling tool.

If using a drilling machine still fails to unblock the toilet, contact an experienced plumber to help you fix the problem by removing some parts of your toilet and reinstalling new parts back. Finally, ensure you follow the manufacturer’s instructions concerning the blocked toilet.

  • Blocked toilet vents

Inadequate toilet venting interferes with the flow of water. For instance, blocked vents can result in overflows creating more negative pressure. Negative pressure creates more air spaces which result in the production of bubbles.

Clear all materials from the vent openings and spray water into the vents using a gardening hose. Also, you can use a drilling machine or a plumbing auger to pull all dirt that has blocked the vents. If you fail to unblock the vents, contact a licensed plumber to check your vent lines and help you unblock the toilet vents.

Sometimes, the problem may not be your toilet drain but rather the neighbor. In this case, consider contacting a nearby local authority and report the problem instantly. Also, you can contact a nearby plumber to help you fix the problem.

Frequently asked questions:

  • What causes my toilet to drain water slowly?

Sometimes, your toilet can fail to drain water as required. Firstly, check the water level in your toilet tank. Lack of water in your tank can hinder water flow once you flush your toilet. Secondly, your toilet can drain water slowly due to the sewer and drain pipes blockage. Inspect the draining pipes and try to unblock the pipes using a plumbing auger.

Moreover, your toilet can drain slowly due to mineral accumulation in the pipes. Minerals such as magnesium, calcium, potassium can accumulate in your draining pipes leading to a blockage. Ensure you check the toilet pipes and try removing the accumulated minerals.

  • Why does my toilet overflow when the washer drains?

If your toilet is overflowing when the washer drains, it may be due to clogging of the sewer pipes and drain pipes. Check the pipes and try to remove all materials that have clogged the pipes.


Despite your toilet being the most important device in your house, it can be damaged at some point and may require some fixation. For instance, your toilet may start bubbling when the washer drains. Luckily, the information above will guide you to fix the problem successfully.

Finally, it is advisable to check your toilet frequently to identify any problems and try fixing them early enough before the damages worsen. In addition to that, ensure you follow the manufacturer’s instructions on caring for and maintaining your toilet.

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