How to Adjust Toilet Water Level

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How to Adjust Toilet Water Level. Adjusting the level of water in the toilet tank keeps your toilet flushing completely. The water level normally falls about 1 inch below the rim of the overflow tube.

Lower levels don't allow the float ball to rise high enough to close the ball cock; a water level that is too high will continuously run, wasting water and forcing you to listen to the running water all day.

  • Bend float arm upward from the center to raise water level in a diaphragm ball cock and a traditional plunger-valve ball cock. Both of these types of toilet mechanisms have a large ball connected to the ball cock.

  • Bend float arm downward from the center to lower water level in a diaphragm ball cock and a traditional plunger-valve ball cock. Replacing your traditional plunger-valve ball cock with a newer diaphragm ball cock will eliminate many valve problems because it has a rubber diaphragm instead of washers and packing rings.

  • Pinch the clip on the side of the float cup and slide the clip up and down to adjust the water level in a floating-cup ball cock.

  • Turn the adjustment screw to lower and raise the water level on a floatless ball cock. Turn the screw counterclockwise to lower water level and clockwise to raise water level. Only adjust in 1/2 inch intervals at a time.

    • Tip

    Other problems can cause a toilet to run continuously, including a stuck handle, a bent lift wire, a leaking float ball, or a flapper that doesn't fit snugly in its seat. Additional reasons a toilet might not drain correctly include a clogged toilet, blocked flush holes, or a lift chain that is too long. Replacement toilet parts are available at many discount stores, hardware stores or plumbing supply stores.

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