What To Know About Adjusting Toilet Bowl Water Levels

Last Updated On November 11, 2022
Adjusting Toilet Bowl Water Level

Depending on the size of our toilet bowl, you may need to adjust the water level released from the tank when you flush. 

There are multiple styles of fill valve assemblies. Most have a similar water level adjustment screw, especially in newer toilets. The float inside of the toilet tank works as a water supply fill valve

The water stops filling the tank when the float reaches a certain level. 
Between commercial and low-flow toilets, we never know how much water we will need in the toilet bowl. 

With these convenient and accessible adjustment screws, we can set the water supply to shut off precisely at the level we want.

What's In This Guide?

      How To Increase The Water Level In A Toilet Bowl

      Sometimes it may seem that there’s not enough water in our toilet bowl to flush all of our waste. If this is the case, we may wonder how to increase the water level in a toilet. 

      We need to remove the toilet tank lid, which gives us access to the fill valve. We will most likely see a ball float resting on the top of the water and a small fill valve hose inserted into an overflow tube, also known as a fill tube. When the float lowers, the water supply valve opens. 

      The small hose begins to fill the tank. At the top of this fill valve assembly, we’ll see an adjustment screw. We can usually turn the screw with a Phillips head screwdriver. This is the first thing to check when the toilet tank is not filling properly.

      Depending on which way we turn it, it either raises or lowers the water level in the tank. 

      Some flush fill valve assemblies do not have adjusting screws for the water level. In this case, simply bending the rod attached to the bowl float can control the height of the water. 

      If we bend the toilet float up, the water level will rise higher before the shut-off is engaged. By bending the rod down,  less water will be able to fill the tank. Higher water supply levels to our tank will result in more water in our toilet bowl.

      Here’s a great video to show how easy it is to fix low toilet water.

      How To Add More Water To A Toilet Bowl: 3 Easy Steps 

       Want to know how to add more water to a toilet bowl in 3 simple steps? We are here to help.

      1.  Remove the toilet tank lid and set it carefully aside.

      2.  Locate the water level adjustment screw or the float rod. Either tighten the screw (righty- tighty) or bend the rod up on the float valve assembly.

      3.  Give the toilet a flush and check the level. If the bowl still needs more water, repeat step two.  

      Did you know? Each toilet requires a certain amount of water to fill the bowl. It’s up to us to adjust the amount of water that goes into the toilet tank by adjusting the bowl float.

      did you know adjust toilet water levels

      Is The Toilet Water Level Too High? 

      Is the toilet water level too high in the bowl?  If we allow the toilet tank to fill up with too much water when we flush, the water level in the bowl can rise to a dangerous level. 

      To prevent our tooshies from getting wet or flooding our bathroom floor, we need to adjust the water fill valve or float in our toilet tank. Adjusting the amount of water it takes to fill the tank also adjusts the water level in the toilet bowl.

      How to Lower Water Level in Toilet Bowl: 3 Easy Steps

      At some point in our lives, we may need to know how to lower the water level in a toilet bowl. Here’s how in three easy steps.

      1. Take the lid off of the toilet tank and set it aside carefully.
      1. When we find the adjustment screw or float, we can bend the rod on the float downwards or turn the screw counterclockwise. ( Lefty Loosey )
      1. We can now test-flush the toilet to check that the water level in the bowl is accurate. 

      Final Thoughts On Adjusting Toilet Bowl Water Levels

      Adjusting the toilet bowl water level is a relatively quick fix for any DIYer. There is no need to call a professional plumber.

      As a homeowner, we must know how to lower the water level in the toilet bowl and what to do if the toilet water level is too high. In most cases, we can simply turn a screw to raise or lower the water level in the toilet bowl. 

      If a screw isn’t visible or doesn’t work for some reason, we can always try bending the rod that holds the bowl float. 

      This float acts as a trigger for the water shutoff valve. When the float is up, the toilet fill valve shuts off. When the tank starts to lower, the water valve opens. The tank begins to fill. 

      The water level inside the toilet tank should match the water flow into the toilet bowl. To adjust the toilet bowl water level, we need to control the amount of water the flush valve assembly allows into the toilet tank.

      FAQs On Adjusting Toilet Water Level

      Can You Adjust The Amount Of Water In A Toilet Bowl?

      All we have to do to adjust the water in a toilet bowl is control the amount of water it takes to fill the toilet tank. 

      We can always bend the rod on the float to adjust the tank’s water level. Most modern flush valve assembly kits come with a water level adjustment screw.

      How Do I Adjust The Water Level In My Toilet?

      When we take the lid off our toilet tank, we’ll see a water level adjustment screw that allows for a Phillips head screwdriver.  

      Turning the screw clockwise will raise the water level in the toilet while turning it counterclockwise will lower the toilet water level.

      How Do I Fix The Low Water Level In A Toilet Bowl?

      If our toilet has a screw to adjust the water level, we simply need to turn it left or counterclockwise to lower the water level in our toilet bowl.

       If there is no screw, we can bend the float downwards, causing the water to shut off at a lower level in the tank.

      How Do I Adjust The Water Level In My Toilet Without Screws?

      Some flush valve assembly kits did not come with water-level adjustment screws. The steel rod on the bowl float can bend up or down. 

      If we bend the float up, the water level in our toilet will rise. Bending it down will lower the water level.

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      About Plumbing Navigator

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      We write about “all things plumbing,” helping you navigate common questions, repairs, and the best plumbing products on the market.

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