Toilet Keeps Making Noise: How to Fix It

Quick answer

A noisy toilet is usually caused by a running fill valve or flapper. Turn off the water supply, flush the toilet, and check for continuous water flow. Adjust or replace faulty parts as needed.

Confirm the symptom

• Hearing water running even when the toilet isn't in use
• Noise coming from the tank or bowl area
• Interruptions in the toilet's normal flushing sound

Tools and prep

• Adjustable wrench
• Screwdriver
• Replacement flapper or fill valve
• Plumber's putty
• Turn off the water supply to the toilet
• Allow the tank to empty completely before starting

Step-by-step troubleshooting

1. Turn Off Water Supply
   Do: Locate the shut-off valve near the base of the toilet and turn it clockwise to shut off the water supply.
   Observe: Water flow stops and the tank no longer fills.
   Means: The water supply is successfully turned off.
   Next: Drain the tank by flushing the toilet and using a sponge to remove remaining water.
2. Inspect the Flapper
   Do: Check the flapper for wear, cracks, or improper seating on the flush valve.
   Observe: Water may be leaking from the tank into the bowl if the flapper is faulty.
   Means: A damaged or misaligned flapper is likely causing the noise.
   Next: Replace the flapper if it's damaged or adjust the chain length for proper seating.
3. Adjust the Fill Valve
   Do: Adjust the float arm or clip on the fill valve to ensure the water level is about 1 inch below the overflow tube.
   Observe: The fill valve stops running after the tank is filled to the correct level.
   Means: The fill valve is properly adjusted.
   Next: If the fill valve still makes noise, consider replacing it with a newer, quieter model.
4. Check the Supply Line
   Do: Inspect the water supply line for kinks or damage that could cause water hammer or noise.
   Observe: Kinks or damage may be visible or cause unusual sounds when water flows.
   Means: A damaged supply line may need replacement.
   Next: Replace the supply line if damaged or kinked.
5. Test the Toilet
   Do: Turn the water supply back on and let the tank fill. Flush the toilet and listen for any remaining noises.
   Observe: The toilet should flush quietly and the tank should fill without continuous running.
   Means: The issue is resolved if no noise is heard.
   Next: If the noise persists, consider consulting a professional plumber.
6. Secure Loose Parts
   Do: Check for loose bolts, nuts, or other components that may be causing rattling or vibration.
   Observe: Tightening loose parts may eliminate the noise.
   Means: Loose hardware was the source of the noise.
   Next: If the noise continues, move on to the next step.

Common causes

Parts matching

Common parts needed to fix a noisy toilet include:

• Toilet flapper for sealing the tank
• Fill valve for regulating water flow
• Supply line for connecting the toilet to the water source
• Tank-to-bowl bolts for securing the tank
• Plumber's putty for sealing connections

Purchase parts that match your toilet model for the best fit and performance.

When to call a professional

• The noise persists after replacing the flapper and adjusting the fill valve
• You notice significant water leaks or damage to the toilet
• You're unable to locate or access the water shut-off valve
• The toilet bowl or tank is cracked or damaged
• Water pressure issues are suspected but you lack the tools to test them

FAQ

Related guides

• toilet flapper replacement
• toilet not flushing properly

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