How To Adjust The Fill Valve In A Toilet

When it comes to fixing a running toilet, adjusting the fill valve is often the solution.
Here is a step-by-step guide on how to adjust the fill valve in a toilet.

Step 1: Turn off the Water Supply

Before adjusting the fill valve, make sure to turn off the water supply to the toilet.
You can do this by turning the valve located on the wall behind the toilet.

Step 2: Remove the Tank Lid

Next, remove the lid from the toilet tank.
Set the lid aside in a safe place where it won’t get damaged.

Step 3: Locate the Fill Valve

The fill valve is located on the left side of the toilet tank.
It is a tall, slender mechanism that fills the tank with water after each flush.

Step 4: Adjust the Water Level

To adjust the water level in the tank, locate the screw on top of the fill valve.
Turning the screw clockwise will increase the water level, while turning it counterclockwise will decrease it.

Step 5: Test the Water Level

Once you have made the adjustment, turn the water supply back on and let the tank fill with water.
Observe the water level and adjust it as needed until it reaches the desired level.

Step 6: Check for Leaks

After adjusting the fill valve, check for any leaks around the base of the toilet or the tank.
If you notice any leaks, tighten the connections or replace any damaged parts.

FAQ about How to Adjust the Fill Valve in a Toilet

Q: How do I know if the fill valve is the problem?

A: If your toilet is running constantly or the water level is too low, the fill valve may need to be adjusted or replaced.

Q: How do I replace the fill valve?

A: To replace the fill valve, turn off the water supply and disconnect the water supply line from the valve.
Then, unscrew the valve from the bottom of the tank and replace it with a new one.

Q: Can I adjust the fill valve without turning off the water supply?

A: No, it is important to turn off the water supply before adjusting the fill valve to avoid any potential flooding or water damage.


Adjusting the fill valve in a toilet is a simple and straightforward process that can save you money on your water bill and prevent potential leaks or damage.
By following these steps and paying attention to the water level and any leaks, you can ensure that your toilet is functioning properly.