Quick Answer:
If you smell a sharp metallic odor when the disposal runs, it’s often caused by a dropped metal item or internal corrosion. Immediately stop using the unit, cut power, and perform a careful inspection with a flashlight. If you find a utensil cap, ring, or other metal object, remove it safely. If the smell continues after removal, the disposer may be failing internally and needs repair or replacement.
Why This Happens
- Dropped metal items (a utensil cap, ring, or small hardware) can rub or get ground against metal parts and create a strong metallic smell.
- Corrosion of fasteners, seals, or the shredding components can produce a metallic or metallic-burnt odor as metal degrades.
- A failing motor or burned electrical component can emit a metallic or acrid smell; that indicates an internal electrical problem rather than a loose object.
- Sometimes food mixed with metal residue gives a metallic note; if this follows grinding vegetable fibers, see Odor worsens after grinding fibrous foods.
Step-by-Step What to Do
Step 1 — Stop and cut power
- Turn the disposal off at the switch, then unplug it or turn off its circuit breaker before doing any inspection. Never work on the unit while it has power.
Step 2 — Run a flashlight inspection
- Use a strong flashlight and look down the disposal opening. Run a flashlight inspection before trying to remove anything.
- Look specifically for a dropped utensil cap/ring inside the disposal or any shiny fragments of metal.
Step 3 — Remove visible objects safely
- If you see a metal object, remove it with long-handled pliers or tongs—do not put your hand inside.
- If the object is stuck, avoid forcing it. If you can free it safely, do so; otherwise call a professional.
Step 4 — Check for signs of corrosion or internal damage
- If you suspect corrosion (flaking metal, pitted parts, or rusted fasteners) or see burnt wiring, stop using the unit. If you suspect corrosion or an object, stop using it and remove the item safely.
- Do not run the disposal if parts look compromised; further use can make the problem worse.
Step 5 — Test briefly and decide next steps
- After removing any object and restoring power, run cold water and turn the disposal on briefly to see if the smell is gone.
- If the smell persists despite removing visible objects and a short test run, the unit may be failing internally and needs inspection or replacement.
- If the odor seems to come more from the sink plumbing than the disposer, check the trap and drain—see Bad smell from kitchen sink drain.
What Not to Do
- Don’t keep running the disposal if you suspect a metal object or corrosion—further grinding can damage it.
- If you can’t safely remove the item, call a plumber/appliance tech.
- Don’t reach into the disposer with your bare hand. Don’t use makeshift tools that could slip and cause injury.
When to Call a Professional
- You cannot locate or remove the metal object safely.
- You see signs of corrosion, burnt components, smoke, or hear unusual grinding that didn’t stop after removing debris.
- The smell continues after inspection and a short test run, suggesting internal failure of the unit.
Safety Notes
- Always disconnect power at the source (unplug or turn off breaker) before looking inside the disposal.
- Use long-handled pliers or tongs to remove objects—never use your fingers.
- If you’re unsure about electrical or internal mechanical issues, stop and contact a qualified technician.
Common Homeowner Questions
- Q: Could a ring really cause that smell?
A: Yes — a ring or metal cap rubbing on parts can create a sharp metallic odor. - Q: Is the motor burning if it smells metallic?
A: Possibly; a burned electrical smell suggests motor or wiring problems and should be checked by a pro. - Q: Will cleaning with baking soda fix it?
A: Cleaning can help food odors but won’t fix metal objects or corrosion—inspect first and remove any item safely.