How to adjust water level in toilet tank
Step 1Check the water level. When flapper trouble isn't the cause of a running toilet, the next most common cause is the water level. When the water level is too high, water will constantly drain into the overflow tube. Be sure to fix this problem as soon as possible to prevent water from spilling out onto the floor causing major water damage if the toilet gets clogged.
With the water running and the tank full, look at the overflow tube. This is an open tube in the middle of the tank that connects the tank and the toilet bowl.
Check to see if water keeps draining into the tube. If that’s happening, you can adjust the water level by lowering the float.
Step 2
Determine the type of float you're dealing with. Water comes into a toilet tank via a fill valve. The fill valve has a float on it that rises or lowers with the water level. The float height is what tells the fill valve to shut off when the tank is full. Therefore, you can lower the water level in the tank by adjusting the height of the float. There are 2 main types of floats:
A float ball fill valve will have a long arm attached to the fill valve, and at the end of the arm there will be a rubber ball-shaped float.
Shake the float ball to determine if there is water inside it. If so, replace it.
A float cup fill valve will have a small circular cylinder wrapped around the body of the fill valve. The cylinder, or float cup, slides up and down on the fill valve shaft, and its height determines the water level.
Step 3
Lower the float on a float ball fill valve. On top of the fill valve, there will be a nut attaching the float arm to the fill valve. When you turn this nut, you can adjust the height of the float. With a nutdriver, turn the nut a quarter turn counterclockwise to lower the float.
Flush the toilet and let the water in the tank refill. Check the water level.
Ideally, the water level should be 1 to 1.5 inches (2.5 to 3.8 cm) below the top of the overflow tube. Continue adjusting the nut by quarter turns until the water level is right.
Step 4
Lower the float on a float cup fill valve. The float on a float cup fill valve is adjusted in much the same way. There will be an adjustment nut on the top of the fill valve. When you turn this nut, it will adjust the height of the float. Turn the nut a quarter turn counterclockwise to lower the float.
Flush and refill the toilet tank.
Check the water level.
Make another quarter-turn adjustment if necessary until the water level in the tank is 1 to 1.5 inches (2.5 to 3.8 cm) below the top of the overflow tube.
Step 5
Check the fill tube if the toilet runs intermittently. The refill tube is a tube attached to the fill valve that fills the tank with water after it’s been flushed. This tube should always be above the water line, otherwise it can lead to intermittent running. When the tank is full, make sure the tube isn't in the water.
To correct a fill tube that dips into the water, simply trim enough of the tube so that it sits above the water line.
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