Bathtub Gurgles When Toilet Flushes? Understand Why & How to Fix It

Are you tired of the annoying gurgling sound that occurs in your bathtub every time you flush the toilet? If so, you’re not alone. This common household phenomenon, known as “bathtub gurgles when toilet flushes,” can be both frustrating and perplexing.

In this article, we will delve into the reasons behind why your bathtub gurgles when you flush the toilet and provide you with some practical solutions to fix the issue. Whether you’re a homeowner or a renter, understanding the potential causes and remedies for “bathtub gurgles when toilet flushes” can help you maintain a peaceful and functional bathroom. So, if you’re ready to bid farewell to the gurgling symphony of “bathtub gurgles when toilet flushes,” let’s dive right in.

Briefly explained: what you need to know about the subject

  • The gurgling sound in a bathtub when flushing the toilet is caused by trapped air in the vent or issues with the P-trap.
  • To fix a gurgling bathtub drain, you can try plunging the toilet, clearing the ventilation system, checking if the pipe is too small, or identifying blocked sewer lines.
  • If the issue persists, it is recommended to call a plumber for further assistance.

bathtub gurgles when toilet flushes

Trapped Air in Vent

When your bathtub echoes with peculiar, enigmatic gurgles following the flush of your toilet, it can be a disconcerting experience. However, fear not, for the root of this conundrum may lie in trapped air within the vent. The significance of proper ventilation cannot be overstated, as it serves as a safeguard against these vexatious noises.

To rectify this perplexing issue, it is imperative to ascertain that your vents remain unobstructed and free from any impediments. Consistent maintenance serves as the key to evading ventilation predicaments . Should you suspect the vent to be the culprit behind the gurgles, embark on an investigation and eliminate any potential blockades.

Optimal venting not only quells the gurgling symphony, but also ensures the vitality of your plumbing system. Hence, carve out a moment to guarantee the harmonious functionality of your vents. In doing so, bid farewell to those irksome sounds and revel in the tranquility of your bath.

If you’re dealing with a clogged toilet filled with poop, check out our article on how to unclog a toilet with poop for helpful tips and tricks to get your toilet back in working order.

Issues with the P-Trap

The Mysterious Symphony: Unraveling the Enigma of Bathtub Gurgling In the depths of your plumbing system, there lies a hidden culprit that orchestrates the perplexing gurgling sound when you dare to flush your toilet. Enter the notorious P-Trap, a seemingly innocuous component that, when plagued by clogs or damage, unleashes unwanted cacophonies in your bathtub. Lamentably, improper installation or injury to the P-Trap can hinder its noble duty of trapping water and thwarting the invasion of foul sewer gases into the sanctity of your home.

As a consequence, the delicate harmony of your bathroom is disrupted by the disconcerting symphony of gurgling sounds each time you flush. Occasionally, the gurgling may arise from a different source – a parched P-Trap. This unfortunate condition occurs when there is a leak or when the water level in the trap reaches an alarmingly low state.

In this parched state, the trap allows air to infiltrate the system, giving birth to an ensemble of exasperating gurgles. Should the disconcerting chorus of bathtub gurgling reach your ears, heed the call to inspect your P-Trap. Seek telltale signs of clogs such as sluggish drainage or wafting odors.

Should you suspect a faltering P-Trap, do not hesitate to summon the expertise of a skilled plumber who can diagnose and remedy the affliction. Remember, a harmonious plumbing system hinges upon the proper functioning of the P-Trap. Do not turn a deaf ear to the symphony of gurgles – promptly address the issue for a tranquil bathroom experience.

bathtub gurgles when toilet flushes

Possible Heading: “Common Causes and Solutions for Gurgling Sounds in Bathtub Drain: A Tabelle”

Cause Description Solution
Trapped Air in Vent When air becomes trapped in the plumbing vent, it can create pressure imbalances in the system, leading to gurgling sounds in the bathtub drain when the toilet is flushed. To clear the vent, use a plumbing snake or call a professional plumber to remove any obstructions and allow proper airflow.
Issues with the P-Trap A malfunctioning or poorly installed P-trap can cause gurgling noises in the bathtub drain when flushing the toilet. The P-trap is designed to prevent sewer gases from entering the living space. Inspect the P-trap for damage, looseness, or incorrect installation. Repair or replace the P-trap as necessary to ensure a proper seal.
Blocked Sewer Lines Main sewer lines can become clogged or obstructed, resulting in improper drainage and gurgling sounds in the bathtub drain. Identify and clear any blockages in the sewer lines using a plumbing snake or hydro-jetting. If necessary, seek professional assistance to resolve the issue.
Pipe Size Inadequacy If the plumbing pipes are too small or poorly designed, the water flow from flushing the toilet may create pressure fluctuations, causing the bathtub drain to gurgle. Check if the pipe size meets plumbing requirements. Consult with a plumber to reconfigure or replace the pipes to ensure proper drainage if necessary.
Improper Ventilation System Inadequate or malfunctioning ventilation systems can result in air pressure imbalances, leading to gurgling sounds in the bathtub drain when flushing the toilet. Clear any obstructions in the ventilation system, such as debris or bird nests. Ensure proper installation and functionality of the vent pipes.

Plunging the Toilet

Bid Farewell to Bathtub Gurgles with the Mighty Plunge Say adieu to the irksome gurgling symphony that accompanies every toilet flush in your bathtub, for the plunge shall be your valiant savior. Yet, my dear comrade, do not plunge haphazardly. There exists an art, a finesse, that can rescue you from those bothersome gurgles.

Let us first delve into the correct method of plunging. Create a tight seal with the plunger and employ short, sharp plunges instead of forceful ones. This shall dislodge any obstructions and restore the gentle flow of water.

Remember, it is a delicate yet resolute dance, not a grueling wrestling match. How does one ascertain if plunging can vanquish the gurgles? If the sound solely emerges when you flush the toilet, rather than with other fixtures, then plunging may prove efficacious.

However , should the gurgling persist or manifest alongside other fixtures, summon the aid of a plumber . Before embarking on your plunging endeavor, steer clear of common blunders. Avoid exerting excessive force, as it may inflict harm upon your pipes or result in an overflow.

Additionally, ensure a proper seal with the plunger to maximize the efficacy of your efforts. Thus, be gentle yet unyielding, and seal the deal with that trusty plunger. Equipped with the correct technique, knowledge of when to plunge, and an awareness of missteps to avoid, you can bid farewell to the gurgles and revel in a serene bathtub experience.

If you’re tired of the incessant gurgling in your bathtub, fear not, for there are solutions to this vexing problem. However, it is crucial to recognize when your ventilation system requires attention. Look for warning signs such as sluggish drainage or unpleasant odors emanating from the drain, as these may indicate a blockage.

So, how does one go about clearing a clogged ventilation system? One effective method involves employing a plumbing snake or auger to dislodge any obstructions within the vent pipe. Alternatively, a high-pressure water jet can be utilized to forcefully eliminate debris.

Regular maintenance is also essential in preventing ventilation issues. Ensure that your vents are cleaned and free from any accumulated leaves or debris. Clearing the ventilation system should not be underestimated, as a blocked vent can lead to a host of other plumbing complications, including slow drainage and irritating gurgling sounds.

In some cases, it can even result in sewer backups. By diligently maintaining and clearing your ventilation system, you can guarantee optimal airflow and avert these troublesome issues. Do not ignore the signs and take prompt action for a peaceful, gurgle-free bathtub experience.

If you’re wondering why your toilet bubbles when your washer drains, check out our article “Toilet Bubbles When Washer Drains” for some helpful insights and solutions.

bathtub gurgles when toilet flushes

How to Stop Bathtub Gurgling When You Flush the Toilet

  1. Start by plunging the toilet to ensure there are no blockages in the pipes.
  2. Check the ventilation system for any clogs or obstructions that may be causing the gurgling.
  3. Inspect the P-trap underneath the bathtub to make sure it is properly installed and functioning correctly.
  4. If you suspect that the pipe connecting the toilet and the bathtub is too small, consider replacing it with a larger diameter pipe.
  5. Look for any signs of blocked sewer lines, such as slow draining or foul odors, and address the issue accordingly.
  6. If you are unsure or uncomfortable with performing these tasks, it is recommended to call a professional plumber for assistance.
  7. Regularly maintain your plumbing system by flushing it with hot water and vinegar to prevent future gurgling issues.
  8. Engage in discussions and seek advice from others who have experienced similar bathtub gurgling when flushing the toilet.

Checking If Pipe Is Too Small

When the toilet is flushed, a peculiar gurgling sound emanates from your bathtub, leaving you perplexed. The culprit behind this enigmatic noise could very well be the size of the pipe. A small pipe can disrupt the harmonious flow of air and water, resulting in trapped air and imbalanced pressure, thus causing the gurgling sound.

To determine whether the pipe is indeed too small, it is advisable to seek the assistance of a professional plumber. Their expertise and specialized tools can accurately measure the pipe and detect any restrictions in flow. Resolving this bothersome gurgling issue may involve replacing the pipe with a larger one, thereby enhancing both airflow and water flow.

By addressing the issue of pipe size, you can bid farewell to the irksome gurgling sound and embrace a serene and tranquil bathroom experience. Remember, in the realm of gurgling bathtubs, size holds great significance!

bathtub gurgles when toilet flushes

Did you know that the sound of a gurgling bathtub when you flush the toilet is actually caused by trapped air in the ventilation system?


My name is Warren and I am a professional plumber licensed and insured in the State of California. I have been in the business for over 10 years and have undertaken small and large projects including bathroom renovation, toilets, garbage disposals, faucets, sinks and kitchen plumbing jobs. This site is based on my experience with toilets. I have installed the best brands and models in all sizes and shapes. I hope this helps you with the unbiased information that you need to make the right decision. …weiterlesen

Identifying Blocked Sewer Lines

As the water in your bathtub gurgles and drains sluggishly, it is an ominous indication that your sewer line may be obstructed. Typically, this occurs as a result of debris accumulating or tree roots infiltrating the pipes. To ascertain the presence of a blockage, attempt to dislodge it using a plunger initially.

However, if this proves futile, it is imperative to enlist the expertise of a skilled plumber equipped with specialized tools, such as a camera, to examine your sewer line. Swiftly resolving a blocked sewer line is crucial to prevent the escalation of grave issues like sewage backups and consequential water damage.

Are you experiencing gurgling sounds in your bathtub drain when you flush the toilet? This could be a sign of a larger plumbing issue. Learn more about how this can allow sewage gas to release into your bathroom in this informative DIY video.

YouTube video

1/3 When to Call a Plumber

Indications that it’s time to summon a plumber When your bathtub drain refuses to cooperate and all your DIY attempts have been in vain, it’s time to bring in the experts. Plumbers possess the necessary skills and tools to tackle the root cause of the gurgling. Furthermore, a foul odor emanating from the drain is a clear signal that a plumber is needed.

This could indicate a clogged sewer line, a problem that requires immediate attention to avoid further harm. Why entrust the job to a professional plumber ? Professional plumbers possess the expertise to accurately diagnose and resolve the issue behind the gurgling bathtub drain.

They can also inspect for any additional problems that may need to be addressed, such as blocked vents or damaged P-traps. Equipped with specialized tools and equipment, they can efficiently tackle complex plumbing problems, ensuring an effective solution to the gurgling issue. Consequences of delaying the call Neglecting the warning signs and procrastinating in calling a plumber can lead to graver consequences.

While a gurgling drain might appear trivial, it could be an indication of larger plumbing issues that could result in water damage or sewer backups. Delaying the necessary repairs can also cause further harm to your plumbing system, resulting in expensive fixes. It is advisable to promptly address plumbing issues as they arise, to prevent any potential repercussions.

If you notice persistent gurgling in your bathtub drain, do not hesitate to call a plumber .

bathtub gurgles when toilet flushes

Why Does Your Bathtub Gurgle When You Flush the Toilet? Possible Causes and Solutions

  • Trapped Air in Vent: One possible reason why your bathtub gurgles when you flush the toilet is due to trapped air in the vent system. As water flows down the drain, it creates a vacuum, which can suck air from other parts of the plumbing system, including the bathtub drain.
  • Issues with the P-Trap: Another common cause of gurgling in the bathtub drain is a problem with the P-trap. The P-trap is a U-shaped pipe that traps water, preventing sewer gases from entering your home. If the P-trap is damaged or clogged, it can cause air bubbles and gurgling noises when water is flushed down the toilet.
  • Plunging the Toilet: In some cases, a gurgling bathtub drain can be resolved by plunging the toilet. This can help to clear any blockages or air pockets in the plumbing system, allowing water to flow more smoothly and reducing the gurgling noise.
  • Clearing the Ventilation System: If the gurgling persists, it may be necessary to clear the ventilation system. The vent pipe allows air to enter the plumbing system and equalize the pressure, preventing gurgling and other issues. A clogged or blocked vent pipe can cause air to be trapped and result in gurgling sounds.
  • Checking If Pipe Is Too Small: Sometimes, a gurgling bathtub drain can be caused by a pipe that is too small to handle the volume of water being flushed down the toilet. This can lead to air being forced back up through the drain and causing the gurgling noise. Consulting a plumber can help determine if pipe replacement or resizing is necessary.
  • Identifying Blocked Sewer Lines: If none of the previous solutions work, it is possible that the gurgling is being caused by blocked sewer lines. Tree roots, debris, or other obstructions can cause backups and gurgling in the plumbing system. A professional plumber can use specialized tools to locate and clear the blockage.
  • When to Call a Plumber: While some gurgling issues can be resolved with DIY solutions, it’s important to know when to call a plumber. If you’ve tried plunging, clearing the vent, and checking for pipe issues without success, it’s best to seek professional help. A plumber can accurately diagnose the problem and provide the necessary repairs or maintenance.

2/3 Comments and Discussions

Imagine a world where your cozy bath time is disrupted by an unexpected gurgle. Frustrating, isn’t it? Well, fear not, for fellow readers have come to the rescue with their ingenious solutions.

One such suggestion is to inspect the vent pipe for any pesky blockages and clear them out, allowing the precious air to flow freely once again. Another brilliant tip involves creating a magical concoction of vinegar and baking soda, which, when poured down the drain, works its powerful charm to break down any stubborn clogs lurking in the P-Trap. And let’s not forget the importance of regular maintenance – using a trusty drain cleaner or enzyme-based product can keep those gurgles at bay in the future.

Of course, prevention is key – be mindful of what goes down the drain to avoid those dreaded clogs. While some valiant souls have successfully conquered this battle on their own, it’s worth mentioning that for others, calling upon the expertise of a plumber may be necessary. Remember, dear reader, there is hope and a plethora of options available to vanquish the gurgle and restore tranquility to your beloved bathroom sanctuary.

If you’re wondering whether it’s possible to bury PEX underground, check out our article “Can You Bury PEX Underground?” for all the information you need.


In conclusion, understanding the reasons behind why a bathtub gurgles when the toilet is flushed can help homeowners troubleshoot and resolve this common plumbing issue. By addressing trapped air in the vent, issues with the P-trap, and other potential problems such as blocked sewer lines or small pipe sizes, individuals can effectively fix a gurgling bathtub drain. However, it is important to know when to call a plumber for more complex issues.

This article has provided valuable insights and solutions for readers experiencing this phenomenon, and we encourage them to explore our other informative articles on plumbing maintenance and troubleshooting for further guidance.


How do you fix a gurgling bathtub?

To address the problem, you can try cleaning the vent cover or using a handheld vacuum to remove any blockages in the pipe. Another option is to use a garden hose to flush water down the vent pipe, effectively clearing the obstruction.

Why is my toilet backing up and bath gurgling?

Your shower and toilet are connected to the same drain line and vent stack. This is known as wet venting. When there is a clog or blockage in either the drain line or vent stack, it can cause air to be pushed in either direction, resulting in the gurgling noise you hear in your toilet.

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