How To Increase Water level In Toilet Bowl?

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Last Updated on September 7, 2022 by acechapman

Is your toilet bowl water level dropping after every flush? Is the toilet bowl water level too high after flushing? Both low water levels in the toilet bowl and high water levels in the bowl can be caused by the same thing. So, this post will explain how to increase the water level of a toilet bowl.

Adjusting the toilet float, replacing the fill valve, clearing the vent stack, or unclogging the toilet can fix low or high water levels. You can also check that the refill tube has been properly clipped to the overflow tube.

If the low water level is due to a cracked toilet bowl, you’ll need to replace it or the whole toilet if it’s a one-piece model.

Locate the screw that connects the toilet bowl to the fill valve. Then, turn it clockwise to raise the water level, and counterclockwise for a lower water level. Make sure the refill tube is not too far from the bowl to siphon water.

The toilet tank is the most important part of a toilet. Two important components of a toilet tank are required to work together for it to function properly.

These are the refill mechanism and flushing mechanism. Both control the amount of water that leaves the tank as well as how much water is absorbed into the tank. This in turn determines the water level in the bowl.

The old and the new toilet tanks are different. The floating ball valve on the old toilet tanks is replaced by a floating cup valve also known as the floating cylinder.

You can adjust the water level of your toilet bowl by turning it up or down. Let’s take a look at the causes of each.

how to increase water level in toilet bowl


The following factors can cause a low water level in your toilet bowl:

  1. Toilet vent obstruction
  2. Fill valve problem
  3. Long refill tube
  4. Toilet traps clogged
  5. Unclipped or worn-out refill tube

If the water level is too high in your toilet, it could be a sign that the toilet flotation is not adjusted properly or that the toilet is partially blocked and draining slowly.

You could have a clogged toilet if the toilet bowl slowly drains and fills up with water. If the water level in the toilet bowl remains high, then it is time to adjust the toilet float.

The toilet bowl should retain water. Depending on what type of toilet bowl you have, the water level in your toilet bowl can range from 25% to 50%. How does a toilet bowl maintain a constant water level after flushing?

The toilet trap is an S-shaped passage in the bottom of the toilet bowl that allows flush water to enter the drainpipe. The trap works by gravity to help you drain the toilet bowl when you have a lot of water.

The trap’s shape allows water to be held in the bowl by allowing it to retain some water. This prevents unpleasant sewer gases from entering the house.

In order to ensure optimal performance, the water level in the toilet bowl must be at a certain level. To troubleshoot a low water level, follow the steps below.


The water level in the toilet tank and the toilet bowl is directly proportional. Low water levels in the tank will cause a low water level within the bowl, which can lead to a slow flushing toilet.

It is also possible to do the opposite. The bowl should have a similar water level to the tank.

The ideal water level in a toilet tank should be approximately 1/2 inch below its overflow tube. The level of some toilets is also clearly marked on the tank.

Adjust the toilet float if the water level is low.


The vent is a tube that runs from your drain pipe to your roof. It serves two purposes and also does two things. The first is to exhaust sewer gases. The second is to allow air to circulate freely. Thus, avoiding any vacuum in the sewer line. This would cause the water in your toilet to dry out.

Your vent may be blocked if all of the water from the toilet bowl and the trap drains into your pipe with a gurgling sound. In this instance, the blocked vent acts as a siphon. The trap air seal was broken, which is why the gurgling sound occurs. This problem could also be present in other appliances, such as the bathtub.

The following could cause a blocked vent:

  • Trapped golf/tennis ball
  • Nests of birds
  • Dead birds and rodents
  • Tree leaves and other rubbish

You can unblock a vent by climbing to the top of the roof. Use a plumber’s snake to unblock the vent. Then, continue flushing the toilet, and make sure to check for any changes in the water level.


The toilet refill tube, which is usually a narrow, black tube that runs from the fill valve to the overflow tube, is small and typically very thin. The fill valve fills the tank with water when you flush the toilet. The fill valve is filling the tank with water. While this is happening, the overflow tube allows water to be pumped into the bowl of the toilet.

The toilet tank’s overflow tube, a cylindrical tube that is located inside the tank, acts as a failsafe. The overflow tube is a cylindrical tube that fits inside the toilet tank and drains excess water to the bowl to prevent flooding.

After flushing, the refill tube will not send water to the bowl if it is damaged, worn, or disconnected from the overflow tube. The water level in your bowl will therefore be lower than normal.

Also, the fill tube should not be too far inside the overflow tube. This will result in a siphoning effect when flushing. The long overflow tube acts as a vacuum to draw water from the bowl of your toilet.

Check the condition of your toilet tank’s fill tube by removing the lid. It is easy to replace a worn-out fill tube. It can be reattached to the overflow tube if it is not hooked up.


The fill valve connects to the water supply line. It is responsible for refilling the toilet tank with water after each flush. The fill valve can be damaged or leaking and less water will go to the toilet bowl and refill tube.

You can check the fill valve’s behavior by removing the tank lid and flushing the toilet. It will be necessary to replace the fill valve if it is damaged.


Cracked toilet bowls will show water leaking from the bottom of the toilet or subfloor. This will cause low water levels in the bowl.

You can crack the toilet bowl by removing the trap from the trap and draining the water through the drain pipe. This is not an easy problem to figure out.

For cracks in the toilet bowl, check the base. Cracked toilet bowls will need to replace.


The toilet bowl water level will rise if the drain or toilet trap is blocked. However, this is not always the case. A rag can clog the drain or trap, which could cause a siphon effect. This will lead to water being sucked from the toilet bowl, resulting in a low water level.

To unblock your toilet, you can use a toilet auger if the trap or drainpipe is suspected to be blocked. Be careful not to scratch your toilet tank’s interior while you do this. You can leave very unpleasant scratch marks.


High water levels in the toilet bowl are usually caused by a blocked drainpipe or toilet trap. The water level can rise so high that it eventually drops to a very low level. This can be caused by siphoning in your drain pipe.

You can use a toilet snake to fix the problem. Be careful not to scratch the bowl as this can cause some unsightly marks.

Too much water in the tank can also cause the toilet bowl water level to rise. If the toilet tank is full, you can flush the toilet bowl. This will then cause the bowl to overflow.

Adjusting the height of the floating cup/cup inside the tank will adjust the water level in the bowl.

If the problem is in the fill valve, the following three methods can be used to adjust the water level in the toilet bowl.

Materials needed:

  • Screwdriver
  • Adjustable wrench
  • Empty bucket
how to increase water level in toilet bowl



  • Turn off the water supply valve. This valve is located on the wall behind your toilet. It is clockwise. Some toilets have a pull-and-push valve. Pull the valve outwards in this instance.
  • To flush all water out of the toilet, flush it and then take it down.
  • Disconnect the water supply from the tank. Before you use a wrench, always use your hands to disengage the water supply line from the tank. Make sure you have a bucket handy to drain any remaining water from the line.
  • Also, loosen and take out the locknut.
  • Take off the lid and store it in a secure place. It is made of ceramic, so it is easy to break.
  • Reach the base of the fill valve.
  • Disconnect the overflow tube from the fill tube and remove the old fill valve.
  • Then, place the new fill valve onto the base.
  • Lock the fill valve by using the locknut
  • Attach the refill tube and the overflow tube.
  • Next, attach the water supply line.
  • Let the water flow into the tank by opening the water inlet valve
  • You can flush the toilet several times to check for changes in the water level.
  • Finally, put the lid back on the top of the tank.


The floating ball valve is the most common type of toilet. A ball is connected to the fill valve by an arm. The ball will be floating on the water if the toilet isn’t in use or the tank is full. The fill valve can be opened by releasing the fill valve and the floating ball will fall to the bottom of your tank after flushing.

The water level in the toilet bowl rises and the floating ball will also increase until it reaches the desired level.

The floating ball height should not be set too low. This will cause less water to fill the tank, which will result in the fill tube sending less water to your toilet bowl.

Before you start fixing it, ensure that the floating ball isn’t damaged. To ensure that it is dry, shake it gently. It will need replacement if it contains any water. Also, it becomes heavier and cannot float well due to the water.

To adjust the water level in the toilet, some people suggest that you bend either upwards or downwards on the floating arm. However, this is not the correct or accurate way to do so.


  • Turn off the water inlet valve. This valve is located at the back side of the toilet. Depending on which type of valve it is, you can either turn it clockwise (or pull it out)
  • You can flush the toilet, then hold it open until the water runs out.
  • Place the lid of your toilet tank in a safe place.
  • Take a look at the overall condition of the toilet’s float ball.
  • You will need to replace the floating ball if it has water in it.
  • When all seems well, check for an adjustment screw at the point where the floating arm meets the valve assembly.
  • Use a screwdriver to turn the screw clockwise one time. Watch the toilet tank fill up with water by opening the water valve.
  • The water level in a toilet tank should not be more than half an inch or one inch below its overflow tube.
  • Continue to adjust until you reach your desired height.
  • Never turn the screw twice at once. The tank can overflow.


Modern toilets use floating cups, also known as floating cylinders or floating balls. It is placed in parallel to the vertical fill valve assembly of a toilet tank.

The float cup can affect the water level in the tank by affecting the volume of water that is being poured into the tank.


This can be done by either releasing the clip from the side of your floating cup or turning the adjustment screw adjacent to it.

Simply squeeze the clip to adjust the height of the floating cup. If you want to raise your tank’s water level, move the clip up. Lower the water level by moving the clip downwards.

Every move that you make, ensure the water inlet tank is shut off and the toilet flushed. Move the clip and open the valve to check the water level.

Use a screwdriver with the adjustment screw to turn it clockwise to increase the water level and counterclockwise for a lower level. You should not turn the adjustment screw more than once without checking the water level. While working on the valve, make sure the tank is empty. Only fill the tank with water to verify the level.


This is basically, how to increase the water level of a toilet bowl. Although it may take some time to find the cause of the problem, the result will justify the means.

The toilet tank is the most likely source of the low or high water levels in your toilet bowl. More than 90% of all cases are caused by low or high water levels. This should be your first concern. Most of these repairs are simple and inexpensive, as we’ve seen. However, if you do call a plumber, it could cost you more rather than save money.

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