What This Problem Usually Looks Like
Most owners first notice a damp cabinet floor, swollen particleboard, or a slow drip that only appears when the disposal is running with water. When you reach under the unit, the housing itself feels wet and you may see water forming at the very bottom of the disposal body. Repair shops commonly see this on older GX and EX models that have been in service eight to twelve years.
| Observation | Meaning | Implication | Next Step |
|---|---|---|---|
| Leak only when water runs, motor off | Drain or flange issue | Not internal | Reseal flange or tighten fittings |
| Leak only when motor runs | Internal seal failure | Water entering motor cavity | Replace disposal |
| Housing wet around seam | Chamber-to-motor leak | Seal deterioration | Replace disposal |
| Drip from reset-button area | Internal water intrusion | Motor at risk | Stop use immediately |
| Flange and hoses bone dry | Confirms internal leak | No external source | Proceed to replacement |
A small number of cases turn out to be splashed water from the sink or a loose hose, but when the leak is centered on the bottom of the canister, it is almost always internal.
See other common Moen garbage disposal issues here.
This article is based on technician input, teardown findings, owner reports, and parts supplier data.
What To Check First
Before assuming the housing is cracked, rule out simpler sources. Run water without the disposal on and look for drips at the sink flange, dishwasher inlet, and discharge elbow. If everything above the unit stays dry and the housing itself becomes wet only when the disposal runs, the leak is coming from inside the motor cavity.
In several units I have opened, you could see staining around the seam between the grinding chamber and motor section, which confirmed it was not just a loose outlet connection.
If you see water collecting at the very bottom of the unit, or dripping from the reset button area, you are no longer dealing with a putty or clamp issue.
Why Moen Disposals Leak From The Bottom
Inside the disposal there are seals that separate the wet grinding chamber from the dry motor section. Over time, those seals harden, wear, or develop slight gaps. Hard water, heavy daily use, and long periods of sitting with water in the chamber all speed this up. Technicians often mention that units that see a lot of starchy or gritty waste tend to develop internal leaks earlier because the abrasives work on those seal surfaces.
Once those internal seals fail, water tracks down through the motor cavity and exits at the bottom. There is no practical way to access and re-seal that area on a Moen GX, EX, or Host Series disposal without destroying the unit.
Repair vs Replacement
For a true bottom leak, repair is not recommended. There is no seal kit or internal gasket set for these models, and attempting to seal the outside of the housing only hides water that is still entering the motor space. That can lead to shorted windings and tripped breakers later.
Parts suppliers note that most professionals quote replacement immediately once a bottom housing leak is confirmed. The only “repair” work that makes sense is correcting any unrelated drain or hose issues at the same time the new disposal is installed.
See the full repair cost breakdown here.
Model-family notes
GX Series disposals tend to reach internal leak stage a bit earlier in homes with hard water because their chambers see more small debris accumulation. EX Series units often stay dry longer, but once they begin leaking from the bottom, the pattern is the same. Host Series models are not immune either, and experienced owners say that once a Host unit wets the cabinet floor from the housing itself, it usually gets replaced that same week.
Preventive tips for the next unit
Flush the disposal with cold water for several seconds after grinding, so debris does not sit on the seals. Avoid letting the chamber stay full of warm water for long periods, which can accelerate seal aging. A periodic deep clean using the manufacturer’s guidance or a simple ice and mild detergent routine helps reduce abrasive buildup around the internal interfaces.