3. Switch off the Water

Before attempting to solve your running toilet issue, you need to empty the tank of water. To do this, you must first close off the water supply to the toilet. Look for the water supply pipe going into the tank, usually located on the bottom left-hand side. Follow the pipe to where it disappears into the wall or floor. Somewhere along the pipe, you will see a tap, which is the shutoff valve. Turn off the tap in a clockwise direction until it’s closed.

toilet shutoff valve PictureLake / Getty Images

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