Symptoms
- Water dripping from the bottom of the disposal
- Puddle under the sink cabinet
- Musty smell in the cabinet
- Leak happens even when disposal isn't running
Likely causes
- CommonWorn internal shaft sealThis seal degrades with age and isn't practically replaceable on most units.
- PossibleCracked housing from a hard impact or freezeDropping the unit during install or a frozen pipe nearby can crack the casing.
- Less commonLoose internal fastenersOn some models this can be tightened, but it's uncommon.
What to do
- Turn off the disposal and unplug it or shut off its breaker.
- Dry the outside of the unit completely, then run water into the sink without turning the disposal on.
- Watch the bottom of the unit for new drips to confirm the leak source.
- Place a bucket under the leak to protect the cabinet while you plan next steps.
- Check if the disposal is still under warranty before buying a replacement.
- If replacing, match the horsepower and mounting type of the old unit or ask a plumber to size a new one.
Tools and parts
- Flashlight
- Bucket
- Dry towel
Replacement garbage disposalSearch: “1/2 HP or 3/4 HP garbage disposal replacement”
When to call a pro
A leak from the housing itself is not repairable at home; a plumber can swap the unit, usually reusing the existing mounting assembly.
Safety
Use caution
Water and electricity near the outlet under the sink is a real hazard; disconnect power before inspecting.