4 Possible Reasons Why Your Toilet Suddenly Overflowed

Perhaps you’ve been stressed out cleaning your bathroom floor because your toilet overflowed unexpectedly. What’s more stressful is that you don’t know the reason why, so you’re not sure if it’s already under control or not. 

Don’t worry; we are here to tell you about the possible reasons your toilet overflowed so that you can do something about it and have that peace of mind. 

Let’s get to it!

Reason #1: There Might Be an Obstruction in the Bowl

Your toilet flushes appropriately because of the siphon jet. The force of the water through the siphon jet pushes the contents of the bowl into the trap way. If there’s an obstruction in your bowl, it may get lodged in the p-trap, and your siphon jet will not be able to flush it further, creating a clog. Hence, the overflowing. 

That’s why you should be careful about the things that might get into your bowl. While toilets can easily handle the most stubborn bits of waste, they are not meant for strange clogs, like toilet paper and other items. Fortunately, some clogs can be managed with a plunger. But if a plunger does not work, you should call a professional plumbing service. 

Reason #2: Maybe There’s Too Much Water in the Reservoir Tank

The reservoir tank in your toilet is only designed to hold as much water as the bowl needs to fill for the next flush. If the float is set too high, your tank will be filled with more water than its recommended requirement for proper flushing. In that case, you’ll definitely experience overflowing when you flush your toilet. Worst case scenario, if your bowl is already too full, the water may flow over the rim. 

To prevent overflowing from happening again, check your float and see where it’s set. If you notice that the water level is above the line, then immediately lower your float. 

Reason #3: Perhaps There Are Clogs Beyond the Trapway

The trapway is one of the things you should look into to prevent overflowing from happening again. It may be the culprit why your toilet is overflowing because there may be clogs inside. This case usually occurs when there’s already a debris build-up in your plumbing system. If this seems to be the problem, your best bet is to call a professional plumbing service so that they can clear the clog in your plumbing system. 

Reason #4: Your Vent Might Be Blocked

The vent may also be the reason why your toilet overflowed. Your toilet is tied into a drain called a soil stack vent. If it becomes clogged, the pressure in your pipes will build up. With that pressure, the influx of water when you flush your toilet dramatically increases, making them escape wherever it can, hence the overflowing. If you’ve suspected that your vent might be the problem, you should call a professional plumbing service right away. 


The aftermath of an overflowing toilet is such a headache. That’s why you need to act on it immediately to prevent it from happening again. There’s no need to wait until it occurs the next time. Call a professional plumber right after it happens so that you can have that peace of mind and experience no hassle.

If you’re looking for a professional plumber in Oak Park, you’ve come to the right place! Candu Plumbing & Rooter has a team of skilled plumbers that will reach your location and address the problem soon to finish the task promptly. We will only suggest the best solutions if your hardware needs a repair or replacement. Contact us anytime! We are ready to help you 24/7!