Bathtub Gurgles When The Toilet Flushes: How To Fix It

Have you ever experienced a sound like a bubbling potion coming from your bathtub after flushing the toilet?

This mysterious gurgling can be more than just an annoyance – it can be a sign of a larger plumbing issue that needs to be addressed.

It’s like a warning sign from your bathtub, alerting you to take action before it’s too late.

In this article, we’ll explore the causes of gurgling bathtubs and provide steps to take to fix the problem.

Understanding the Cause of Gurgling Bathtubs

If your sink’s making strange, gurgling noises every time you flush the loo, it’s time to get to the bottom of the cause! To understand what the gurgling is, it’s important first to identify possible causes.

One of the most common causes of gurgling noises is an issue with the water pressure of the plumbing system. Testing the water pressure of the plumbing system is a good first step in diagnosing the issue. If the water pressure is too low, it can cause a sucking action in the pipes and result in a gurgling sound.

Another potential cause of gurgling noises could be the age of the plumbing system. If it is an older system, it may need to be upgraded to ensure that it can handle the pressure of the water. Upgrading the plumbing system can help to reduce the gurgling noises and ensure that they don’t occur in the future.

Checking the Toilet’s Vent Stack

As the water rushes through the vent stack, the sound of its turbulence echoes off the walls like a rumbling thunder.

Examining the connections and clearing any debris can help diagnose the potential cause of the gurgling. If a blockage is found, it may be necessary to remove the blockage before the problem can be resolved.

Begin by examining the connections between the toilet and the vent stack to ensure that they’re securely fastened. If the connections appear to be loose, tighten them to ensure a tight seal.

Next, check for any debris that may be blocking the pipe. If blockage is found, it can be removed with a plumber’s snake or other appropriate tool. If the blockage is not easily accessible, contact a professional plumber to assess the situation and help clear the obstruction.

Once the connections and blockage have been cleared, flush the toilet again to see if the gurgling has been eliminated.

Inspecting the Plumbing System

After examining the toilet’s vent stack, it’s important to inspect the entire plumbing system to ensure all pipes and connections are in good condition and not leaking.

To do this, you should start by testing the drains and cleaning the pipes, checking for any clogs or blockages. If the drains are clear, then check all of the pipes and connections for any signs of damage or wear.

This can include looking for cracks, holes, or corrosion. It’s also important to check for any loose connections, as they can cause leaks. If any damage or wear is found, it’s important to replace the pipes or connections to avoid any further problems.

Finally, check for any leaks in the system, as these can cause gurgling sounds when the toilet flushes. If any leaks are found, it’s essential to repair them as soon as possible.

Replacing the Vent Stack

Replacing the vent stack is a crucial step in ensuring the plumbing system runs smoothly and without any issues. This means increasing the airflow and boosting the pressure in the plumbing system.

The vent stack is a pipe that connects the drain lines to the roof, and it plays a critical role in regulating air pressure in the drainage system. It is important to inspect the vent stack regularly to make sure that it is not blocked, corroded, or damaged in any way.

If the vent stack is found to be faulty, it should be replaced as soon as possible. Replacing the vent stack is not an easy task and requires a professional plumber to ensure that the job is done correctly.

The plumber will first measure the size and type of vent stack that is needed for your plumbing system. Then, they will remove the old vent stack and replace it with a new one. After the installation is complete, they will check to make sure that the air pressure is balanced, and that the vent stack is securely in place.

With a properly working vent stack, you can be sure that your bathtub gurgles will be resolved.

Adding a Ventilation Fan

Installing a ventilation fan is a great way to improve air flow and reduce humidity in your home, and it doesn’t require a lot of time or effort to do so – and you won’t have to worry about it breaking down like you would with other fixtures.

To properly install a ventilation fan, you’ll need to find the right location for it. The fan should be installed close to where the gurgling is occurring so it can be most effective. It’s important to ensure that the fan is installed in an area that won’t be affected by water or other elements.

The fan should be installed with the proper ventilation ducts and registers as well, so that air can flow freely.

After the fan is installed, it’s important to maintain it regularly. This includes cleaning the fan blades, checking the fan motor, and ensuring that the fan is in good working condition. It’s also important to check the fan itself to make sure it’s properly connected to the ductwork and that all connections are sealed to prevent air leaks.

With regular maintenance, a ventilation fan can provide a great solution to bathtub gurgles when the toilet flushes.

Installing a New Toilet

Upgrading your toilet can be a great way to modernize your bathroom, and it’s a fairly simple task that won’t take up too much of your time.

To do this, you’ll need a few tools, like a screwdriver, pliers, and a hacksaw. You’ll also need to buy a new toilet, and you may want to consider hiring a professional plumber to help with the installation if you’re not confident in your abilities. Professional help can be especially helpful if you’re replacing a toilet in an older home since the plumbing may be more difficult to work with.

Once you have the right tools and help in place, you can start installing the new toilet. First, you’ll want to turn off the water supply, then remove the old toilet. Next, you’ll need to prepare the floor and install the new wax seal.

Finally, you can attach the new toilet, turn the water supply back on, and make sure everything is working properly.

Sealing Leaks in the Drain Pipes

If you’re hearing an unwelcome sound coming from your drains, it might be time to seal those pesky leaks.

Inspecting the seals of your drain pipes is the first step to finding out where the leak is coming from. Look closely for any cracks or loose connections that might be causing the leak. You can also test the valves to make sure they’re functioning properly. If they’re not, you may need to replace them.

Once you’ve identified where the leaks are coming from, you can seal them with plumber’s putty, caulk, or a special adhesive. Make sure to read the instructions on the packaging before applying the sealant.

Additionally, it’s important to apply the sealant evenly and clean off any excess with a damp cloth. With a few simple steps, you can quickly address the issue and keep your bathtub from gurgling when the toilet flushes.

Frequently Asked Questions

How long does it take to fix a gurgling bathtub?

If your bathtub is gurgling when the toilet is flushed, it could be due to a drain blockage or a problem with air pressure.

Fixing the problem typically takes several hours and requires professional help. To start, a plumber will run a drain snake through the pipes to clear any blockages.

If the problem is air pressure related, the plumber will likely need to adjust the pressure relief valve. Whichever the cause, the plumber will inspect the system to ensure that the plumbing is functioning properly and make any necessary adjustments.

What are the potential dangers of a gurgling bathtub?

When your bathtub gurgles, it’s typically a sign of clogged drains or a lack of water pressure.

If left unaddressed, this can be dangerous as the blockage can lead to water backing up, potentially causing water damage to your home or the growth of harmful bacteria.

To avoid potential hazards, it’s important to take the necessary steps to ensure your drains are clear and that the water pressure is adequate.

Is it necessary to hire a plumber for the repair process?

When it comes to fixing a gurgling bathtub, the answer to whether or not you need to hire a plumber depends on the severity of the situation.

If the issue is minor and you feel confident in your plumbing skills, you may be able to do it yourself with the right tools.

However, if the problem is more serious, it’s highly recommended that you seek professional help. Attempting to fix it yourself could result in further damage and cost you more money in the long run.

How much does it cost to replace a toilet?

The cost of replacing a toilet is determined by a number of factors, such as the type of toilet you choose and the installation costs.

If you’re handy and have some experience with DIY repairs, you could save some money by doing the job yourself. However, it’s important to note that if you don’t have the right tools and experience, you may end up spending more money in the long run.

It’s best to consult a professional plumber to discuss the cost factors associated with replacing the toilet, and decide whether it’s more cost-effective to do the job yourself or hire a professional.

Is it possible to prevent gurgling in the future?

Identifying the cause of a bathtub gurgling when the toilet flushes and stopping any leaks is the best way to prevent similar issues in the future.

To start, you’ll want to check the toilet’s flapper valve to make sure that it’s still working properly and that it isn’t leaking.

If the valve is in good condition, you’ll want to check the drain line for any obstructions or blockages that may be causing the gurgling.

You may also want to check the sink and shower drains to make sure they’re clear and unobstructed as well.

If you find any blockages or leaks, you should take the necessary steps to repair them as soon as possible.


Your bathtub gurgling when the toilet flushes isn’t an uncommon issue. In fact, it’s estimated that nearly 75% of households experience this issue at least once.

Now that you know the causes and possible solutions, you can fix this problem yourself. Start by inspecting your toilet’s vent stack, plumbing system, and drain pipes. If necessary, replace the vent stack and consider adding a ventilation fan.

Finally, if all else fails, consider a new toilet installation. With these steps, you can easily solve your bathtub gurgling issue and have peace of mind.