A garbage disposal leak from the top or side may be fixable with a gasket, clamp, or flange seal. A leak from the bottom of the unit itself usually means the internal shaft seal has failed and the disposal needs replacement.
This applies to InSinkErator, Moen, Waste King, and other garbage disposals installed under kitchen sinks.
Does this affect you?
Use this if water is pooling in the cabinet and seems to come from the bottom of the disposal housing or reset button area.
Safety first
- Turn off the disposal switch and breaker before working under the sink.
- Never put fingers or a hand inside the disposal.
- Use a flashlight, tongs, pliers, or a wooden dowel instead.
- If the disposal is hardwired rather than plugged into an outlet, use a licensed electrician for wiring work.
Find exactly where the leak starts
- Dry the disposal, pipes, and cabinet floor.
- Place dry paper towels at the sink flange, side connections, and bottom housing.
- Run water into the sink.
- Run the disposal briefly with water flowing.
- Check which paper towel gets wet first.
- Top wetness points to the sink flange. Side wetness points to dishwasher or drain connections. Bottom wetness points to an internal seal.
Fix top or side leaks
- A top leak may require resealing the sink flange with plumber’s putty.
- A dishwasher inlet leak may need a tighter hose clamp.
- A discharge pipe leak may need the gasket reseated or replaced.
- After any adjustment, repeat the paper towel test.
A bottom leak is different. Water has passed the internal motor shaft seal and is escaping through the housing. Exterior sealant or tighter bolts will not repair that failure.
Check the label for model and horsepower before buying a replacement. Many disposals fit standard mounts, especially when replacing with a similar size. Plug-in units are a manageable DIY plumbing swap for some homeowners; hardwired units or uncomfortable plumbing should go to a plumber or electrician as appropriate.
The red reset button fixes overload trips, not leaks. Most household disposals last roughly 8 to 15 years, so a bottom leak on an older unit usually means replacement is the sensible path.
Sources
- InSinkErator – Garbage Disposal Leaking Water (2025)
- Moen – Diagnosing a Leaking Disposal (2025)
- Waste King – Disposal Leak Troubleshooting (2024)