Since replacing valves are inexpensive and easy to install, getting a new fill valve is the best option. Most new valves are comprised of all-plastic parts, which prevents them from whistling.

How do I stop my toilet from making a high-pitched noise?

If your toilet makes a high-pitched sound after flushing , the fill valve screen may be clogged with debris. In order to resolve the issue, first remove the fill valve from the tank. Then , remove and clean the fill valve screen. Re-install the fill valve and test.

What does it mean when your toilet whistles?

A toilet making an air noise or a whistling or hissing sound is a sign that the fill valve is not closing and sealing properly, and air or water is leaking from the fill valve. If the fill valve isn’t closing properly, begin by replacing it. If this doesn’t solve your problem, call a plumbing professional.