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Common Reasons For An Overflowing Toilet

Updated: Dec 2, 2022

Common Reasons For An Overflowing Toilet

An overflowing toilet can be one of the most problematic plumbing issues in the home as they are used so frequently in daily life. Although toilets are relatively reliable and rarely cause any issues, it is essential to be aware of what can cause a toilet to overflow to prevent it from happening again. 


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A blocked drain that does not allow the toilet to flush correctly, a float that has not been appropriately adjusted. Hence, it causes the tank to overfill or a blocked vent pipe which is how the air in the pipe is replaced each time the toilet is flushed. A float is a valve that controls the amount of water which enters the bowl. It is essential for preventing overflow and clogging in a piping system.

The flush valve is situated at the bottom of the toilet tank and is used to control the release of water from the tank. It performs a similar function to that of a toilet's flush handle. The urinal's flush valve can sometimes be known as a water closet spud or simply a spud. Hence, it causes the tank to overfill or a blocked vent pipe which is how the air in the pipe is replaced each time the toilet is flushed. 




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A blocked drain is a pronounced issue to notice when it has occurred. Blocked drains can be a big problem to notice when they first happen. Drain running slowly and no water coming out of the drain are signs of a blocked drain. However, a blocked drain is usually only ever noticed when it becomes an emergency. Water will start to overflow from the toilet bowl rather than the tank. To stop the water from flooding the toilet bowl, you will need to remove whatever is blocking it. A toilet plunger will usually solve the issue quickly for straightforward blockages, but for more severe blockages, a professional plumber may be required. 



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If your toilet becomes clogged more often, a blocked vent pipe is possibly causing it. A blocked vent pipe is the number one cause of a clogged toilet. This problem not only reduces the effectiveness of your toilet but also wastes water and causes unpleasant odours to develop in your bathroom. A blocked toilet is usually caused by old or broken flushing valves. If your toilet starts to create a loud noise or an odour, or if it becomes difficult to flush the toilet, you should consider replacing the flushing valve.


The cost of this repair can be as reasonable as €50 up to €400 depending on the style and brand of your current flush. The purpose of the vent pipe is to move external air into the plumbing system to replace the air pumped with each flush. When this is blocked, it will cause the toilet to not be able to flush correctly, which will lead to the toilet overflowing. An issue like this would typically require a skilled plumber to fix it. High Filler Float: The first two issues that can cause a toilet to overflow will cause water to spill out from the toilet bowl. In this scenario, it causes the spill to come from the toilet's tank. If the filler float is set too high, the tank will fill with excessive amounts of water, causing the toilet to leak from the sides.


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You can solve this problem by adjusting the tank's mechanism to control the float levels. Other issues that can cause toilets to overflow are : 

- Flushing too much waste or toilet paper all at once 

- Disposing of non-flushable items in the toilet such as pads or cotton wool

 - Flushing kitchen waste such as peels from fruits and vegetables or trimmings from meat 

- Flushing pet waste such as dog poop bags and kitty litter 

- Unattended children putting non-flushable items in the toilet

- Overfilling the toilet or submerging toilet paper in water


If you avoid the causes outlined, that should help prevent your toilet from overflowing. However, if you have any issues with your toilet, overflowing or otherwise, then you can call us, and we will get one of our expert plumbers out to you as soon as possible so that they can assess and fix the issue. 


Call Stillorgan Drain Cleaning and we will be there within 90 minutes to unblock toilet

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