To fix an overflowing toilet, your immediate priority is to stop the flow of water by turning the shutoff valve behind the toilet clockwise or reaching into the tank to lift the fill valve float. Once the flooding has stopped, if the cause was a clog, wait for the water level to recede slightly and use a heavy-duty flange plunger to clear the trapway obstruction. If the cause was a stuck fill valve, adjust or replace the valve mechanism. Callout type="warning" title="Hygiene Warning": Wear rubber gloves and boots when cleaning up overflow wastewater. Verification: Test a controlled flush cycle after clearing the blockage to ensure normal drainage.
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