It’s easy to take our toilets for granted, but when the water level in the tank is too high, it can be a real problem. If your toilet tank is constantly overflowing or the water level is just too high, there are a few things you can do to lower it. First, check to see if the float ball is set too high.
The float ball is what controls the water level in the tank and if it’s set too high, it will cause the water level to be higher than normal. To adjust the float ball, simply turn the adjusting screw clockwise to lower the water level. If that doesn’t work, you may need to replace the fill valve.
The fill valve is what controls how much water goes into the tank and if it’s not working properly, it could be causing your overflow problem. To replace the fill valve, simply turn off the water supply to your toilet and flush until all of the water has been emptied from the tank. Then unscrew the old fill valve and install a new one in its place.
- Look inside your toilet tank and locate the water level marker
- This is usually a line or small dot that indicates the maximum fill line for the tank
- Adjust the float arm so that it rests lower in the tank
- The float arm controls how high or low the water level is in the tank, so by lowering it you will also be lowering the water level
- Flush the toilet to allow any excess water to drain out of the tank and into the bowl
- Keep an eye on the water level as you do this, and stop flushing when it reaches your desired level
How to Adjust the Flush Water Level on a dual flush Toilet
How to Adjust Water Level in Toilet Tank With Ball
If your toilet tank doesn’t have a float ball, there’s a good chance it has a fill valve with a float cup. The float cup is attached to the fill valve and rises as the water level in the tank rises. When the water reaches the proper level, the float cup shuts off the flow of water into the tank.
If your toilet is constantly running or if you have to jiggle the handle to stop it from running, chances are that your fill valve needs adjusting. Here’s how to do it:
First, shut off the water supply to your toilet.
Next, flush the toilet to empty the tank. Now remove the lid from the tank and locate the fill valve. It’s usually on one side of the tank and has a large knob or lever on top.
There will be a plastic or metal rod coming out of the top of the fill valve with a small rubber ball (the float cup) at its end. Use an adjustable wrench to loosen but not remove any nuts or screws that hold this assembly in place.

Credit: diy.stackexchange.com
How Do I Make My Toilet Tank Fill Less Water?
If your toilet tank is filling too high, there are a few things you can check to try and fix the issue. First, make sure the float is properly adjusted. The float controls how much water is in the tank and needs to be set at the proper level.
If it’s set too low, the tank will fill too high; if it’s set too high, the tank won’t fill enough. You may need to adjust the float up or down a bit to get it just right.
Another thing to check is the fill valve itself.
Over time, sediment can build up in the valve and cause it to not close properly, which can result in too much water entering the tank. Try cleaning out the valve with a small brush or by running vinegar through it (this will also help remove any mineral deposits that might be causing problems).
If neither of these fixes works, you may need to replace your fill valve entirely.
This isn’t a difficult job – you can find replacement valves at most hardware stores – but if you’re not confident in your ability to do it yourself, you may want to call a plumber.
How Do I Adjust the Water Level in My Toilet Tank?
The water level in your toilet tank is easy to adjust. There are two ways to do it: the float arm or the ballcock. The float arm is a metal rod that goes up and down with the water level.
The ballcock is a plastic or rubber ball that sits on top of the water. To adjust the water level, you will need to turn off the water supply to your toilet. Then, flush the toilet to empty the tank.
Next, find the adjustment screw on the side of the tank and turn it clockwise to lower the water level or counterclockwise to raise it. You may need a Phillips head screwdriver or a flathead screwdriver, depending on what kind of screw it is.
Why is the Water in My Toilet Tank Too High?
There could be a few reasons why the water in your toilet tank is too high. One reason could be that the float arm is set too high. The float arm is what controls the water level in the tank, so if it’s set too high, the water level will be higher than normal.
Another possibility is that there’s a leak in the fill valve. A leaky fill valve can cause water to slowly trickle into the tank, raising the water level over time. If you’re not sure what’s causing the problem, it’s best to call a plumber to take a look and make any necessary repairs.
Conclusion
If your toilet tank is overflowing or the water level is too high, there are a few things you can do to lower the water level. First, check to see if the float is set too high. The float controls how much water is in the tank and should be set at about 1/2 inch below the rim of the tank.
If it’s set too high, simply adjust it downwards. Another possibility is that the fill valve needs to be adjusted. The fill valve controls how much water enters the tank and should be set so that the water level is about 1/2 inch below the overflow tube.
To adjust it, turn the knob clockwise to lower the water level or counterclockwise to raise it. Finally, if neither of these solutions works, you may need to replace your flush valve assembly.