How to Fix Loud or Broken Fill Valve
When your toilet is making noise, your fill valve is usually the cause. Different noises indicate different issues inside the toilet tank, but the fix is almost always simple. Below are the four most common toilet sounds, what causes them, and how to solve each one fast.
Quick Diagnosis Guide
If your toilet is:
- Hissing → Likely a leak or water level issue
- Squealing or Whistling → Debris or worn internal parts
- Vibrating or Fog-horning → Diaphragm or pressure resonance
- Banging → Water hammer or a valve shutting off too abruptly
While a hissing sound is most often caused by a worn flapper or flush valve seal, many other toilet noises come from the fill valve itself. For that reason, replacing the fill valve is usually the best fix. We recommend the Korky 2X Long-Life Fill Valve because it uses QuietFILL Technology, is made from 2X stronger materials, and includes a 10-year warranty.