Garbage Disposal Making Noise? What Each Sound Means
A garbage disposal that suddenly starts making an unfamiliar noise is telling you something specific. The type of sound — humming, grinding, clicking, screeching, or vibrating — points directly to the cause. Match what you hear to the right section below and you will know exactly what is going on.
We have cataloged the most common disposal noises and traced each one to its source. Most of them are fixable in under 10 minutes. A few of them mean the unit is on its way out.
For a full overview of disposal problems beyond noise, see our garbage disposal troubleshooting guide.
What a Healthy Disposal Sounds Like
Before diagnosing a problem, know what “normal” sounds like. A working disposal makes a steady whirring sound during operation, with a brief grinding noise when processing food. That grinding fades to a smooth whir once the food clears.
Volume varies by brand and motor type. InSinkErator models use induction motors spinning at 1,725 RPM — these tend to be quieter, especially the Evolution series with SoundSeal technology. Waste King units use permanent magnet motors at 2,600-2,800 RPM, which spin faster and are generally louder, particularly at startup. Both sounds are normal for their respective motor types.
If the noise your disposal makes has changed from what you are used to, something has shifted. Here is what each new sound means.
Noise guide — what each sound means
| Sound | Most Likely Cause | Severity |
|---|---|---|
| Humming/buzzing | Jammed flywheel | Medium — fix quickly to avoid motor burnout |
| Grinding (metal-on-metal) | Hard object caught between impellers and grinding ring | Medium — remove object |
| Clicking/rattling | Loose object bouncing inside | Low — remove object |
| Screeching/squealing | Worn bearings or motor issue | High — may need replacement |
| Loud vibrating | Loose mount or drain connections | Low — tighten fasteners |
Humming or buzzing
This is the most common abnormal disposal noise. The motor is running — you can hear it — but the blades are not spinning. The flywheel is stuck. Something wedged itself between the impellers and the grinding ring, and the motor cannot turn the plate. InSinkErator’s support documentation confirms that a jammed flywheel is the primary cause of humming in their units.
A humming disposal draws extra current because the motor is fighting the obstruction. If left running, the overload protector will trip (the red reset button on the bottom pops out) or the motor windings will overheat and burn out. Turn it off immediately.
Full fix instructions: garbage disposal humming
Grinding or metal-on-metal
A harsh grinding sound means something hard is caught in the grinding chamber — a piece of bone, a fruit pit, a bottle cap, a stray utensil, or a piece of broken glass. The impellers are hitting the object on every rotation.
Turn off the disposal right away. The longer it runs, the more damage the impellers and grinding ring take.
Clicking or rattling
A rhythmic clicking or rattling usually means a small loose object — a cherry pit, a small bone fragment, a broken-off piece of the splash guard — is bouncing around inside the chamber. The disposal still works, but the noise is annoying and the object can cause damage over time.
Screeching or squealing
A high-pitched screech or squeal that persists after clearing the chamber points to worn bearings. The bearings support the motor shaft, and when they degrade, metal grinds against metal inside the motor housing. This is not a user-serviceable repair. If your disposal is over 8-10 years old and screeching, it is approaching the end of its useful lifespan.
Loud vibrating
Vibration that shakes the cabinet or pipes is usually a mounting problem, not a disposal problem. The unit may have worked loose from the sink flange, or the drain pipe connections have loosened. This also happens when the disposal body contacts a pipe during operation. A worn splash guard can also cause vibration if it has hardened and is no longer absorbing movement.
Video guide
Video: “Easy! Garbage Disposal FIX - Loud Noise and Vibrating” by Kevin Gaudineer
Fix each noise type
Fix humming: allen wrench method
- Turn off the disposal and disconnect power
- Insert a 1/4-inch Allen wrench into the hex hole on the bottom center of the unit
- Work the wrench back and forth until it turns freely in complete circles both directions
- Use tongs to remove any debris from inside the chamber (flashlight helps)
- Press the red reset button on the bottom of the unit
- Run cold water, then turn on the disposal
The Allen wrench size is 1/4 inch across all major brands — InSinkErator, Waste King, and Moen. InSinkErator includes a silver “Jam-Buster” wrench with their units, approximately 4 inches long, designed for this purpose. Full guide: jammed garbage disposal
Fix grinding/clicking: object removal
- Turn off power and disconnect
- Shine a flashlight into the disposal opening
- Locate the foreign object
- Use tongs or long-nose pliers to grab and remove it
- Rotate the flywheel by hand (with power off) to check for additional objects
- Reconnect power, run cold water, and test
Fix vibrating: tighten the mount
- Check the mounting ring where the disposal connects to the sink flange — tighten if loose
- Check the drain pipe slip-nut connections — hand-tighten, then snug with pliers
- Look for pipes touching the disposal body — adjust for clearance
- If the splash guard is cracked or hardened, replace it ($8-$12 at any hardware store)
After the fix — what to expect
Once you clear an obstruction, the disposal should return to its normal operating sound immediately. Run cold water for 15-30 seconds before turning the unit on. If you hear the normal whir, you are done.
Some things to watch for in the first few uses after a fix:
- Slightly rougher grinding for a day or two is normal if the impellers got scratched by a hard object. This smooths out
- A single click on startup is normal for some models — the flywheel engaging
- Continued noise after removing all visible debris means something is stuck under the impeller plate where you cannot see it. Try the Allen wrench again from the bottom
InSinkErator recommends running cold water during grinding and continuing for 2-3 seconds after the grinding stops. This keeps the grinding chamber clear and reduces noise.
When Noise Means Replacement
Some noises cannot be fixed because they signal component failure inside the motor housing.
The Allen wrench spins freely, but the disposal still hums. This means the flywheel is not jammed — the motor itself has failed. The motor windings are burned out. Compiled community data shows that when the reset button will not stay pressed in and the flywheel is free, the motor is done. See our guide on disposals that hum but don’t work for confirmation steps.
Screeching that persists after clearing the chamber. Worn bearings are a motor-housing problem, not something you can access or replace. If the disposal is older than 8-10 years, replacement is the practical choice.
Any noise accompanied by a burning smell. The motor is overheating. Turn it off immediately and do not use it again. Replacement cost runs $200-$625 total with professional installation, per 2026 pricing data. Jammed disposal repair, by comparison, runs $75-$175 if you call a professional — though the Allen wrench fix is free if you do it yourself.
InSinkErator’s jammed disposal guide{:target=“_blank”} covers their official troubleshooting procedure. For general disposal care, Family Handyman’s guide to items you should keep out of your disposal{:target=“_blank”} is a solid reference.
FAQ
Why is my garbage disposal so loud all of a sudden?
A garbage disposal that becomes loud suddenly has a foreign object caught in the grinding chamber — a bone fragment, utensil, or piece of broken glass. Turn off the disposal, disconnect power, and use tongs to remove the object. If no object is visible, use a 1/4-inch Allen wrench in the bottom hex hole to rotate the flywheel and dislodge whatever is stuck.
Is a humming garbage disposal dangerous?
A humming disposal is not an immediate safety hazard, but leaving it running while jammed causes the motor to overheat. Jammed disposal motors draw 3-4 times normal current, which trips the overload protector. If the protector fails or the unit lacks one, the motor windings burn out. Turn the disposal off as soon as you hear humming without blade movement.
Can a noisy garbage disposal be fixed?
Most noisy disposals can be fixed. Obstructions (humming, grinding, clicking) are cleared by removing the object and using the Allen wrench — a free fix that takes 5-10 minutes. Loose mounts causing vibration need tightening. The exceptions are worn bearings (screeching) and burned motors (humming with free flywheel), which require unit replacement at $200-$625 installed.
How much does it cost to fix a noisy garbage disposal?
Fixing a noisy garbage disposal costs $0 if you clear the jam yourself with a 1/4-inch Allen wrench. Professional jam clearing runs $75-$175. If the noise indicates motor failure, replacement costs $200-$625 total with professional installation, or $75-$200 if you install the new unit yourself, per 2026 pricing data.