You know it is time to replace your toilet fill valve if the valve gets stuck open and fails to shut off, causing continuous overflowing, if it makes loud whistling or squealing noises during every refill, if water leaks continuously past the valve head, or if the tank takes an excessively long time to fill despite a fully open shutoff valve. Replacing a faulty fill valve is an inexpensive and straightforward plumbing repair. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before replacing the fill valve. Verification: Test the new fill valve with multiple flush cycles to ensure it shuts off cleanly and quietly.
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