Why Does a Toilet Gurgle?

If your toilet makes a gurgling sound or bubbles when you flush it, it may be more than just an annoyance. A gurgling toilet is often associated with a weak flush. A gurgling toilet is more than just an annoyance; it is a sign of a developing problem that will only get worse if it is not fixed. There are several problems that can cause a gurgling toilet. The first step in resolving the issue is to diagnose it. Click here to learn more.

The most common reason for a gurgling toilet is a blockage in the plumbing system. Many people report that their toilets will begin gurgling when the sewers are flushed on their street. The flushing of the sewer system is not the cause of the problem, but it makes a problem that was already there more apparent. The most common cause for a blockage that causes gurgling is in the sewer line, toilet, or the vent stack. However, the sewer line is the most common cause. Things that can cause sewer lines to become blocked our tree roots, items that are flush down the toilet which should not be, such as toys or non-flushable cat litter. If your sewer line becomes blocked it will have to be cleaned out by a professional.

Another problem that can cause a gurgling toilet is a weak valve in the tank that does not allow the tank to fill to the proper level. This valve will allow water to escape slowly and the tank will never reach the proper level. This can also cause a gurgling sound when you flush the toilet. If this is the culprit, then you will have to have a professional replace the valve with one that seals properly. In this case, the gurgling sound is caused by air entering the system due to the leak.

Blockages in the vent stacks are often caused by animals and should be cleaned out by a professional. If your toilet gurgles when you turn on the sink or shower, this is often a sign of a problem with the venting system. If you have recently upgraded and added more to the plumbing system, it may be that your vent stack is inadequate to handle the additional load. Once again, this will have to be checked out by a professional to assure that the system is hooked up and working properly for your size of plumbing needs.

As one can see, there are many reasons that can cause a gurgling toilet. The bad news is that they almost always signal a problem that will get worse over time. A gurgling toilet never fixes itself or resolves on its own. Fixing the problem can often cost several hundred dollars in plumbing fees, unless you are the do-it-yourself type person and decides to tackle the job yourself. However, licensed plumbers are almost always your best bet because a botched job can end up costing you even more in the end. It is always advised to hire a professional who can get the job done right the first time.