Why is my toilet gurgling on a septic system: Common causes and how to fix them

Several factors can cause this unsettling noise, and if left unaddressed, they could lead to costly repairs down the road. 

In this blog post, we’ll explore some of the most common causes of toilet gurgling on a septic system and provide tips on how to fix them. So grab a cup of coffee and read on to learn how you can keep your plumbing running smoothly!


All of us have been there. It begins with a tiny grumble that is hardly audible. But as it continues to become louder, you begin to worry about what might come next. 

You start to doubt if it would be worthwhile to call a plumber in the middle of the night because you can’t sleep due to your anxiety that the toilet would overflow. 

But what exactly are you up against here? What triggers this occurrence? The causes of a toilet gurgling on a septic system will be covered in this article, both minor and major, so you may decide whether or not it requires immediate treatment. 

Common Causes of Toilet Gurgling

Via: hips hearstapps

There are a few things that can cause your toilet to gurgle when you flush it on a septic system. One common issue is a blockage in the septic tank itself. 

This can be caused by anything from tree roots growing into the tank to simple waste buildup over time. If your toilet gurgles after flushing, it could be an indication that your septic tank needs to be cleaned or pumped out.

Another common cause of toilet gurgling is a blockage in the sewer line leading from the house to the septic tank. This can be caused by things like grease buildup, objects that have been flushed down the toilet, or even tree roots growing into the sewer line. 

Grease, hair, and other debris can also cause a blockage in your drain line. Over time, these materials can build up and cause a clog. 

If you think you have a blockage in your drain line, you should call a professional plumber to have them take a look. They will be able to use a camera to inspect the inside of your pipe and determine what is causing the blockage. 

Once they know what is causing the problem, they will be able to clear the blockage and repair any damage to your sewer line.

How to Fix Toilet Gurgling

Via: home inspection insider

If your toilet gurgles when you flush it, there could be a problem with your septic system. There are a few common causes of toilet gurgling in a septic system, and fortunately, they can all be fixed relatively easily.

Unblocking the drain line

This can be caused by anything from hair and soap buildup to objects that have been flushed down the toilet and become lodged in the drain. There are a few ways that you can unblock your drain line. 

One way is to use a plunger. If you do not have a plunger, you can try using a wire hanger or a plumbers snake. If these do not work, you may need to call a professional to clear the blockage for you.

Replacing Damaged Pipes

If your toilet is gurgling on a septic system, it’s likely due to damaged pipes. Replacing the damaged pipes is the best way to fix the problem and prevent it from happening again. 

Here’s what you need to know about replacing damaged pipes in a septic system:

The first step is to identify the location of the damage. This can be done by looking for leaks, cracks, or holes in the pipe. Once you’ve found the damage, turn off the water supply to the toilet.

Next, remove the damaged section of the pipe. Cut out the section with a saw or other cutting tool and make sure to remove any sharp edges.

Now, you’ll need to measure and cut a new section of pipe that’s the same size as the one you removed. Once you have your new piece of pipe, install it using clamps or other fasteners.

Turn on the water supply and flush the toilet several times to test for leaks. If there are no leaks, your repair is complete!

Checking for Leaks from the Septic Tank

If you think your toilet is gurgling because of a leak in your septic tank, there are a few things you can do to check for leaks. 

First, check the ground around your septic tank for any signs of wetness or pooling water. If you see any wet spots, it’s possible that there is a leak in your septic tank. 

Another way to check for leaks is to look at your septic tank itself for any cracks or holes. If you see any damage to your septic tank, it’s likely that there is a leak. 

If you have a manhole cover over your septic tank, you can remove it and look inside the tank to see if there is any water leaking out.


Can a full septic tank cause toilet gurgling?

When you turn on the water or flush the toilet, the noise will become audible. This indicates that the tank has to be pumped since it is full. The septic tank’s inability to perform its intended job as a result of being overloaded with sediments causes the gurgling.

How do I fix my toilet tank gurgling?

Clear the items stuck in the toilet as well as those that are afloat in the water to remove this type of obstruction. If it’s deeper down, you can use a plunger to clear the clog. Make sure the plunger completely covers the drain hole and attempt to remove the obstruction by giving it a good ten to twenty plunges.

How do you know when a septic tank needs emptying?

Toilets and washing machines are among the fixtures and appliances that drain slowly. Around the tank and the drain field, there is a pooling of water. A backflow of sewage is happening on your property. You haven’t cleaned out your septic tank in over a year.


Toilet gurgling can be a sign of a variety of problems in a septic system. Common causes include blocked pipes, faulty valves, and insufficient water pressure. 

Fortunately, these issues are relatively easy to fix with the right tools and knowledge. Taking the time to identify the source of your toilet’s gurgling will go a long way in helping you get it fixed quickly and efficiently.

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