Why Does My Toilet Gurgle When I Shower? (Best Fix!)

My toilet doesn’t seem to have any visible issues, but why does my toilet gurgle when I shower?

When a toilet gurgles while you are taking a shower, it is often caused by a problem with the plumbing vent system.

The plumbing vent system is responsible for allowing air to enter the drain pipes. This helps to prevent a vacuum from forming and allows water to freely flow through the pipe.

The gurgling sound in your toilet during showering likely indicates a ventilation issue within the plumbing system. It occurs when the draining water creates a vacuum in the plumbing pipes, causing air to be drawn in through the toilet trap, resulting in the gurgling sound.

Why Does My Toilet Gurgle When I Shower?

I’m sure you’re wondering; why does my toilet gurgle when I take a shower?

There are several reasons why your toilet gurgles when taking a shower, some of those reasons are explained below.

Reason #1: Clogged Drain

A clogged drain is a common reason for a toilet to gurgle when you shower.

The shower and toilet share the same drain line, and if it becomes clogged, they can cause gurgling in the toilet when you shower.

The clog can be caused by a buildup of hair, soap scum, or other debris in the drain line.

If you suspect a clogged drain is causing the gurgling, you can try using a plunger to clear the blockage.

If that doesn’t work, you can use a drain snake or a plumbing auger to try and remove the obstruction. If the clog is too far down the line, you may need to contact a plumber.

It’s also important to note that regular maintenance of the drains can help prevent clogs from forming in the first place.

Tip: You can use a mixture of vinegar & baking soda to clean the drain on a regular basis, and avoid pouring grease or oil down the drain, as they can solidify and cause clogs.

Reason #2: Venting Issue

Proper venting is crucial for the proper function of a toilet.

The vent pipe allows air to enter the drain line, which helps to prevent a vacuum from forming when water flows down the drain.

If the vent is blocked, it can cause gurgling in the toilet when you shower. A common cause of a blocked vent is a bird’s nest or debris built up in the vent pipe.

The blockage can also be caused by a malfunctioning vent fan or by a vent pipe that is too small.

If the blockage is in the vent pipe, it would need to be removed by a professional plumber.

If the blockage is caused by a malfunctioning vent fan, the fan should be replaced or repaired.

Tip: If the blockage is caused by a vent pipe that is too small, the pipe may need to be replaced with a larger one.

Reason #3: Low Water Pressure

Low water pressure can cause a vacuum effect in the drain lines, which can cause toilet gurgling when the shower is running.

✅ When the water pressure is low, it can create a suction in the drain pipes, drawing air from the sewer line into the drain pipes.

This can cause a gurgling sound in the toilet as the air bubbles pass through the pipes.

Low water pressure can be caused by a variety of factors, including:

1. Leaks in the Pipes

A leak can cause water to escape from the system, reducing the overall water pressure.

Clogged water supply line: Mineral buildup or debris can restrict the flow of water and decrease pressure.

2. Water Supply Main Issue

If the water supply main that feeds your house is damaged or not functioning properly, it can cause low pressure.

3. Water Pressure Regulator

A malfunctioning water pressure regulator can cause low water pressure.

If you suspect low water pressure is causing the gurgling in your toilet, you should contact a plumber to diagnose the problem and make the necessary repairs.

It’s important to have a regular check-up of the water pressure to ensure that it’s working properly, as the low water pressure can also cause damage to appliances and fixtures.

It can also affect your daily activities like showering and washing dishes.

Reason #4: Leak In Pipes

A leak in the pipes can cause water to seep into the sewer line, which can cause gurgling in the toilet when you shower.

Leaks can occur in various places in the plumbing system, including in the supply lines that bring water into the house, in the drain lines that carry waste water away, and in the joints that connect different sections of pipe.

Signs of a leak in the pipes include:

• Water stains on walls or ceilings
• The sound of running water even when no water is being used
• A musty odor
• High water bills
• A decrease in water pressure

If you suspect a leak in your pipes, it’s important to have a professional plumber inspect your plumbing system and locate the leak.

It’s important to address leaks as soon as possible because leaks can cause damage to your property, increase water bills and lead to health hazards if not fixed.

Note: Leaks can cause the gurgling sound in the toilet, as well as other issues.

Reason #5: Sewer Line Blockage

A blockage in the sewer line can cause gurgling in the toilet when you shower.

The blockage can be caused by a variety of factors, including:

• Buildup of grease, hair, and other debris in the sewer line
• Tree roots growing into the sewer line
• Collapsed or broken pipes
• Foreign objects getting stuck in the sewer line

Sewer line blockages can cause a variety of problems, including:

• Slow draining toilets and sinks
• Gurgling noises in the plumbing system
• Backup of sewage into the home
• Unpleasant odors
• Flooding in the basement

If you suspect a blockage in the sewer line is causing the gurgling in your toilet, it’s important to contact a plumber to diagnose the problem and make the necessary repairs.

How To Fix Toilet Gurgle Issue

To fix a toilet gurgle issue, you need to follow the below steps in order to get it done correctly.

Step 1: Check For A Clog

The first step in fixing a toilet gurgle issue is to check if the toilet is clogged. If the toilet is clogged, use a plunger to clear the blockage.

If the water level in the toilet bowl is very low, it may indicate that there is a blockage in the pipes.

Also, If the toilet takes a long time to drain after being flushed, it may be a sign of a blockage.

Additionally, If you hear gurgling noises coming from the toilet, it may be a sign that there is a blockage in the pipes.

Lastly, If the water in the toilet bowl starts to rise and overflow, it is a clear sign of a blockage.

Tip: If you are unable to clear the clog, it may be necessary to call a plumber to remove it.

Step 2: Inspect The Vent Pipe

If the toilet is not clogged, the issue may be caused by a blockage in the vent pipe that is connected to the toilet.

A vent pipe is a pipe that allows air to enter the plumbing system and helps to prevent gurgling and slow draining in the toilet.

When inspecting the vent pipe, here are a few things to look out for:

Locate the Vent Pipe

The vent pipe is typically located on the roof of the building and is connected to the plumbing system through the wall.

Check for Blockages

Look for any visible blockages such as leaves, debris, bird nests, or any other foreign objects that might have accumulated in the pipe.

Check for Damage

Inspect the pipe for any signs of damage such as cracks, holes, or rust.

Check the Pipe’s Opening

Make sure that the pipe’s opening is not covered by any debris or other foreign objects, which can restrict the airflow.

Check the Pipe’s Slope

The pipe should have a slight slope to allow the water to flow out of the pipe. If the pipe is not sloped properly, this can cause a blockage.

Check for Any Odors

If the pipe smells bad, it may be a sign that there is a blockage or decay inside the pipe, which may require cleaning or replacement.

Step 3: Adjust The Water Level In The Toilet Tank

Adjusting the water level in the toilet tank is a simple process that can help fix a gurgling toilet.

The water level in the toilet tank should be set so that it is about 1/2 inch below the top of the overflow pipe.

If the water level is too low, the toilet may gurgle when it is flushed.

Here is a guide to adjusting the water level in the toilet tank:

Locate the Fill Valve

The fill valve is located inside the toilet tank and controls the water level.

It is typically located at the back of the tank and is connected to the water supply.

Check the water level

Measure the water level in the tank by looking at the water level in the overflow pipe.

The water level should be about 1/2 inch below the top of the overflow pipe.

Adjust the Water Level

If the water level is too low, turn the adjustment screw on the fill valve clockwise to raise the water level.

If the water level is too high, turn the adjustment screw counterclockwise to lower the water level.

Flush the Toilet

After adjusting the water level, flush the toilet to see if the gurgling has stopped.

If the gurgling continues, repeat the process until the water level is set correctly.

Note: It is important to note that you should turn off the water supply before making any adjustments to the fill valve, to prevent any accidental flooding.

Conclusion

In conclusion, why does my toilet gurgle when I shower?

Your toilet gurgling when you shower is likely caused by a blockage in your building’s drainage system, which is likely caused by a blockage in the main sewer line or a problem with the vent stack.

When water drains from your shower, it can create suction in the pipes, which can cause a gurgling sound in the toilet.