A leaking garbage disposal is one of those appliance problems that gives you a clear clue if you know where to look. The water shows up in one of three places. Dry the unit completely, run a cup of water through it, and watch where the drip starts. That single check does most of the diagnosis.
Leak from the top: the sink flange
Water around the rim where the disposal meets the bottom of the sink points to the flange. That’s the metal collar held against the sink drain hole by a mounting ring underneath, sealed with plumber’s putty.
Putty dries out over the years, cracks, and water gets between the flange and the sink. This is the most common disposal leak. A tech loosens the mounting ring, cleans out the old putty, re-seats the flange with fresh putty, and re-tightens. No new unit needed, but getting the seal to hold requires the right putty quantity and even clamping pressure. Done wrong it just leaks again, so it’s worth having someone who’s done it before.
Leak from the side: a hose connection
A drip from the side usually comes from one of two places. The dishwasher inlet hose is clamped to a nipple on the side of the disposal. That clamp can loosen or the hose can harden and crack. The other spot is the discharge outlet where the drain pipe connects, sealed by a rubber gasket that flattens with age.
One useful check: if the drip only appears when the dishwasher runs, the inlet connection is almost certainly the source. Beyond that observation, a tech goes in, identifies which component has failed, and replaces it. On a newer install, a forgotten knockout plug in the dishwasher inlet is also worth ruling out.
Leak from the bottom: the unit is done
Water from the bottom seam is the one that doesn’t have a repair. That seam is where the motor housing meets the grinding chamber. It’s sealed internally, and when that seal wears through, there’s no reliable way to fix it in the field. Plan on a replacement. Most disposals reach this point somewhere past the eight-to-twelve-year mark.
If you’ve confirmed the water comes from the bottom and isn’t running down from the flange above, stop using the unit.
The reset button is not a leak fix
The red button on the underside restarts the motor after an overheat or jam. It has nothing to do with water. If the unit drips, the button doesn’t help. If it won’t turn on, press the button once and try again.
Stop using it and call us
A leaking disposal drips into the cabinet every time water runs through it. Cabinet bases rot quickly from sustained moisture and mold follows. Put a pan under the unit, stop running it, and get someone in.
Flange reseals, gasket swaps, hose replacements, and full unit swaps are all jobs our techs handle regularly. We’ll tell you which one you need and give you a written estimate before any work starts. ADRIUM Service Solutions covers the Tri-Valley (BEAR #50788, CSLB #1136642, A+ BBB). We’ll get you on the schedule fast, often same or next day when we can.
If the leak ties into the dishwasher line, that’s worth a look too. See our dishwasher repair service and the dishwasher repair guide. Curious about what repairs cost? See appliance repair costs in the Bay Area.
Call (925) 999-4095 or email [email protected]. You can also reach us through the contact page.
FAQ
My garbage disposal is leaking from the bottom. Can it be fixed? Usually no. A bottom-seam leak means the internal motor seals have failed, and a sealed-motor unit can’t be reliably resealed in the field. It’s a replacement.
Why is it leaking from the top? The sink flange. The plumber’s putty sealing the disposal to the sink drain has dried out. That’s a repairable reseal.
Does the reset button stop a leak? No. It only restarts the motor after an overheat or jam. It does nothing for water.
Can I keep using it while it leaks? Stop running it until the source is found, and clear anything stored under the sink so the cabinet base stays dry.