If your toilet tank is constantly overflowing, or if the water level is too high, you may need to lower the water level in the tank. There are a few ways to do this, and the best method will depend on the type of toilet you have. If you have a float ball type toilet, you can adjust the water level by adjusting the float ball.
If you have a flush valve type toilet, you can adjust the water level by turning the adjustment screw.
- Turn off the water supply to the toilet by turning the knob or lever to the right
- Flush the toilet to empty out as much water from the tank as possible
- Remove the lid of the toilet tank and set it aside
- Find the float ball or cup and lower it down to a lower position in the tank by gently pushing down on it
- Check for any leaks around the base of the toilet bowl and tighten any bolts or screws that may be loose
- Turn on the water supply to see if your changes have lowered the amount of water flowing into the tank, if not, repeat steps 4-6 until desired results are achieved
How to Adjust the Flush Water Level on a dual flush Toilet
How to Lower Water Level in Toilet Bowl to Clean
If your toilet bowl is starting to look a little dirty and you want to clean it, you may be wondering how to lower the water level in the toilet bowl. Here are some easy steps to follow:
1. Turn off the water supply to your toilet.
This is usually located behind the toilet or under the sink.
2. Flush the toilet to empty as much water out of the bowl as possible.
3. Use a cup or bucket to remove any remaining water from the bowl.
You can also use a sponge or mop if necessary.
4. Once the bowl is empty, use a brush and cleaner of your choice to scrub away any dirt or grime. Be sure to reach all areas of the bowl, including under the rim.
5. Rinse away any cleaner with fresh water and then turn on the water supply again.

Credit: diy.stackexchange.com
How Do You Lower the Level of a Toilet Tank?
A toilet tank is lowered in level by adjusting the float ball. The float ball is a plastic or rubber ball that floats on top of the water in the tank. The float ball is connected to a rod that goes to the valve at the bottom of the tank.
When the water level in the tank gets too high, the float ball rises and activates the valve, which lets water out of the tank and into the bowl. To lower the level of your toilet tank, you’ll need to adjust your float ball so that it doesn’t rise as high when the water level in your tank gets too high.
There are two ways to adjust your float ball:
1) You can adjust the height of your float ball by screwing it up or down on its rod. This will raise or lower how high your floatball sits in relation tothe water line
2) You can adjust how much water flows into your toilet tank by turningthe knob on your fill valve.
How Do I Lower the Water in My Tank?
If your goal is to lower the water in your tank, there are a few different ways that you can go about doing this. One option is to simply remove some of the water from the tank using a siphon or turkey baster. Another option is to add live plants to your aquarium which will help consume some of the water through evapotranspiration.
You can also try setting up a drip system which slowly drains water out of the tank over time. Finally, you can adjust your fish food so that it contains less moisture content; this will help reduce the overall amount of water in your tank.
Why is the Water in My Toilet Tank Too High?
If the water in your toilet tank is too high, there are a few possible causes. One possibility is that the float arm or float ball is not set at the correct height. If the float arm or float ball is set too low, it will allow water to enter the tank and raise the water level.
Another possibility is that the fill valve itself is not properly adjusted. If the fill valve is turned on too high, it will cause water to enter the tank faster than it can be used, raising the water level.
If you have checked both of these things and they seem to be fine, then it’s possible that there could be a problem with your home’s main water supply.
If your home has a well, there could be an issue with the pressure switch or pump. If you have city water, there could be a problem with a clogged pipe or excessive pressure in the system. In either case, you’ll need to contact a professional plumber to diagnose and repair the problem.
Conclusion
If your toilet tank is filling up too high, causing the toilet to flush on its own or making it difficult to flush, you may need to lower the water level. To lower the water level in your toilet tank, start by turning off the water supply valve. Then, flush the toilet and hold down the handle to let all the water out of the tank.
Next, use a sponge or rag to wipe out any remaining water from the inside of the tank. Finally, turn on the water supply valve and check that the new water level is where you want it to be.