To stop a constant flow of water running into your toilet, first remove the tank lid and check the internal mechanisms. If the water level is rising too high and spilling continuously over the top of the overflow tube, the fill valve float is set too high or stuck; adjust the adjustment screw or float clip downward so the water shuts off at least an inch below the overflow rim. If water is trickling constantly down into the bowl through the center opening, the rubber flapper is warped or worn out and must be replaced. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve behind the toilet if internal repairs take time. Verification: Listen to the tank for 2 minutes to confirm the water flow stops completely.
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