If you notice the water level in the toilet bowl rising dangerously high toward the rim during a flush, you must act instantly to prevent a flood: reach out and turn off the water supply valve behind the toilet clockwise, or immediately remove the tank lid and lift the fill valve float ball or cup upward to shut off incoming water. Stopping the water flow immediately prevents wastewater from spilling over the porcelain edge onto your floor. Callout type="warning" title="Hygiene Warning": Wear rubber gloves and keep a towel ready to contain any minor splashing. Verification: Verify that the water level drops and stabilizes safely below the bowl rim.
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