When your toilet system is actively overflowing, you must act quickly to mitigate damage. Turn off the water supply valve on the wall behind the toilet immediately to stop incoming water. If the valve is stuck, remove the tank lid and lift the float ball or cup upward to shut off the fill valve. Once water flow ceases, determine if a clog caused the backup (requiring a plunger) or if a broken fill valve needs replacement. Callout type="warning" title="Hygiene Warning": Wear rubber gloves and use towels to contain wastewater. Verification: Verify that the water level drops and stabilizes below the rim before attempting repairs.
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