Water Level in Toilet Bowl Keeps Dropping – Reasons & Solution

There are numerous toilet issues that you may experience, and one of them is the dropping of the water level in the toilet bowl. When the entire setup in a toilet fails to function properly to keep everything running normally, any of the setup parts can cause various problems.

The water level dropping problem can occur for various reasons, but determining the cause is essential. Some reasons are self-explanatory, but in some cases, a professional plumber is required. So you don’t need to worried about this issue first, find the reason as we say and identify that can you solve this problem whether any professional is needed.

This article will show you why the water level in the toilet bowl is dropping and what needs to solve them. So keep reading the guide and check what we have discussed today.

What does it mean Water Level in Toilet Bowl Keeps dropping?What does it mean Water Level in Toilet Bowl Keeps dropping

The term “water level low” refers to the fact that the water level in your toilet bowl is lower than it should be. It should be about one inch below the overflow tube’s opening. If it’s much lower than that, then there might not be enough water in the tank to fill the bowl after a flush.

Most people notice a crack toilet crack in their toilet bowl, allowing water to run out on the floor or down the drainpipe. However, this low-level water issue could be another cause, such as a clogged vent, a damaged fill tube, or a damaged flush valve or flapper.

Reason of Water Level in Toilet Bowl Keeps Dropping

Now we will tell you why your toilet bowl water level is dropping, and with that, we will tell you the fixing process. You have to identify the reason and step by step solving the problem;

1. Clogged Vent Water Level in Toilet Bowl Keeps Dropping

A clogged toilet vent decreases drain flow and can cause clogged water levels. Furthermore, the water creates a suction that can damage the pipes and empty P-traps, causing a sanitation issue.

This problem is typically caused by a buildup of waste, toilet paper, and non-flushable items in the main drain and sewer lines. Some pressure, such as tree roots or excess building weight, can cause the vent line to break.


To determine the cause of this symptom, turn on all of the faucets and flush the toilet. You will hear gurgling and bubbling sounds when water flows down the drain, indicating that the vent is clogged with debris or something else.


First, check the vent where the vent is open to pass the sewerage line and see any material such as debris or heavy particles. Then clear away the debris and other obstructions so that water can flow freely.

After that, pour some water from the upper side of the vent to clear completely. Sometimes for clogging heavy particles, you might need a drill to break them and remove them from the vent, and if you need to apply this auger process, you should arrange a minimum of 200 fit augers.

2. Cracked BowlCracked Bowl

Accidents happen, and sometimes they happen to you unknowingly, like this causing damage to your toilet that you may not be aware of. The majority of the toilet is made of porcelain, which can crack or break very easily. 

Simple repairs are also frequently the cause of a cracked toilet, and as a result of this crack, water can leak. As a result, the cracked toilet could be another cause of the low water level in the bowl. If you notice a crack on the toilet tank after identifying the problem, it should be repaired as soon as possible.


First of all, the bowl won’t stay full, but that can occur for other reasons. To fill the toilet bowl with water, after filling the toilet, turn off the faucets that the water can’t run outside. 

After doing this, wait for 1-2 hours, and if you notice that the water is less in the toilet bowl than before, even though it is turned off, then be sure that your toilet bowl is cracked.


Remove the water from the bowl remaining flush and turn off the water supply. Secondly, unscrew the whole toilet and remove it from the toilet. But some people attach the toilet to the floor with cement. To replace the toilet from this condition, you need to break the toilet and cement coat; this work is pretty much tricky, and you may need to have a plumber for this.

After removing the toilet, installing the new toilet, and installing the toilet by screwing, install the toilet simply through screwing. But those who have no option to install the toilet by screwing can apply the new simple screwing way or attach the toilet with cement.

3. Damaged Fill TubeDamaged Fill Tube

A fill tube is a vertical tube located inside a toilet’s tank. Its purpose is to move water into the bowl if the ballcock fails, preventing the tank from overflowing. However, this fill can be damaged for various reasons, and if this occurs, the water will not drain or refill properly, resulting in a low water level in the bowl.

On the other hand, a damaged fill tube can cause water to leak from the fill tank, resulting in a constantly dropping water level in the toilet bowl.


When you bought a new toilet, your toilet fill tube could fill your toilet water tank much faster, but after facing this low water level issue, if you see that your toilet fill tube takes more time than before to fill the tank, be sure your toilet fill tube is damaged.

On the other hand, after filling the tank, if you notice that the tank has less water than before, then be sure that your toilet fill tube is damaged.


Replace the damaged fill tube and install the new one is the only way to get this problem. First, flush the remaining water from the toilet tank, remove the damaged fill tube, install a new fill tube, and don’t forget to separate the float ball.

4. Leaky Flush ValveLeaky Flush Valve

When the lever on the toilet flapper/flush valve is pressed, water is released from the tank into the bowl. However, if the flapper/flush valve does not seat properly and forms a tight seal against the valve seat, water leaks from the tank into the bowl. Because of water leaks from the tank, you have a low water level in the toilet bowl. 


There is the clearest sign that a flush valve needs to be replaced and for this mix some food color into the toilet water tank. If you find coloring leaking water into the bowl after a minute without flushing, the flush valve and flapper are leaking.


Replacement is only one way to solve this problem, and to do this work, flush the water from the toilet tank. Remove the damaged flush valve/flapper with a screwdriver and install a new one and check with the color mixing process of any water leak from the flush valve/flapper.

Four, toilet to clean the toilet bowl for disinfecting the toiletFour, toilet to clean the toilet bowl for disinfecting the toilet

Here we have discussed four cleaning tips that will prevent toilet disinfecting, and for this, you will be safe from dangerous germs. So check the tips and follow them as we describe.

Tip 1: Clean inside bowl and rim two times

After applying the toilet cleaner, use a plastic brush to scrub around the inside of the toilet bowl and allow it to soak. We all know that the rim is the most challenging part of cleaning a toilet, and if you clean it properly, your toilet will be free of 50% of germs, so pay attention to cleaning the rim. It’s a good idea to clean the inside bowl and rim again after you’ve cleaned the outside.

Tip 2: Clean exterior part properly

Apply an all-purpose disinfectant to the toilet’s exterior. You can clean the exterior with a scrub sponge, and it will look more luxurious if you clean the exterior with hot water after applying spay.

Tip 3: Clean floor around the toilet

Don’t forget to pay attention to the base and floor around the toilet because this part gets much dirty than the other parts of the toilet. You can use toilet bowl cleaner to clean this ground part, and after applying the cleaner, wait for some time to soak it, then clean with hot water.

Tip 4: Clean toilet seat and hinges

Using a toilet seat cleaner to clean up any spills left on the toilet seats would also make the user feel less ‘icky’ about cleaning up any spilled bodily fluid left on the toilet seat. It also aids in the elimination of germs from the seat, making cleaning the seat crucial.

Don’t forget to clean the seat hinges, so scrub the hinge area with the scouring paste vinegar and baking soda, using a soft-bristled brush to avoid scratching the porcelain or the hinge, which is usually made of plastic.


  • Question: How do you seal a leaky water feature?

Answer: If necessary, use a putty knife or similar tool to help the sealant penetrate the cracks and ensure that each crack is covered. Allow enough time for the sealant to dry completely.

  • Question: How much water should be in your toilet bowl?

Answer: Check to see if the toilet has a mark on the inside of the tank that indicates the proper water level when learning how to adjust the water level in the toilet bowl. It should be 1 to 2 inches lower than the fill valve and overflow tube.

  • Question: How do I convert a low-flow toilet to high flow?

Answer: A low-flow toilet cannot be converted to a high-flow toilet, but its flush power can be increased. Raise the float in your tank or cylinder to produce more powerful flushes. Otherwise, you can repair or replace the flush valve to improve the strength of your flushes.

  • Question: Can you still buy high-flow toilets?

Answer: There are legal ways to purchase high-flow toilets, as well as illegal ways that the authorities admit will never catch you. Toilets that flush 3.5 gallons and are manufactured outside of the United States can be imported if a supplier can be found.


Today that solving process we have discussed gradually you can solve all the reasons for dropping the water level because the work is easy. But if you do not have the experience to do any work at home and if this task seems difficult to you specialty removing the whole toilet and installing a new toilet, you can also call a professional. 

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