A leaking disposal is diagnosed by WHERE it leaks. Top = sink flange seal (resealable). Side = dishwasher hose or discharge tube (clamp / gasket). Bottom = cracked housing (replace the unit). The 2-minute diagnostic: dry the disposal, run water, watch where the drip starts. Below: the five leak points, what each costs, and the three places not to chase.
Reviewed by Mike Larson, Master Appliance Technician · 18+ yrs in-field · Last reviewed
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Quick answer
Dry the disposal with paper towels, then run cold water and watch closely: (1) leak from the top where it meets the sink = mounting flange — needs reseal with new plumber's putty, $185–$285; (2) leak from the side near the dishwasher hose = loose hose clamp or failed inlet, free re-tighten or $185 gasket; (3) leak from the discharge tube going to the drain = gasket or loose flange bolts, $185–$245; (4) leak from the bottom of the housing = cracked motor housing, the disposal is done, $245–$485 replacement; (5) water around the red reset button = sealed-motor breach, replace. Never glue or putty over a housing crack.
Root causes, ranked by what we find
What it is: The flange that sits in the sink drain hole seals with plumber's putty. After 8–12 years the putty hardens and shrinks. Symptom: water beads under the sink at the top of the disposal when running the sink (even without the disposal on).
Fix: Drop the disposal, scrape old putty, lay new plumber's putty around the flange, re-mount. 45-minute repair.
Typical all-in: $185–$285 all-in
What it is: The dishwasher drain hose clamps to a port on the side of the disposal. Loose clamp or failed inlet gasket. Symptom: leaks only during dishwasher cycle.
Fix: Re-tighten or replace the hose clamp. If the inlet gasket failed, $185 gasket replacement.
Typical all-in: DIY $0 / $185 with parts
What it is: The L-shaped pipe leaving the disposal toward the P-trap is sealed with a rubber gasket and two flange bolts. Vibration loosens them; gaskets harden. Symptom: drip from the side outlet when the disposal runs.
Fix: Replace gasket + re-tighten the two flange bolts evenly. 20-minute repair.
Typical all-in: $185–$245 all-in
What it is: Internal corrosion eats through the bottom of the motor housing — 100% the disposal is done. Symptom: drip from the lowest point of the unit, often rust-colored. No reseal or epoxy will fix it.
Fix: Full disposal replacement. We carry InSinkErator Badger 5 / Evolution Compact / Pro 750 in 1/3, 3/4, 1 HP.
Typical all-in: $245–$485 installed
What it is: Water seeping out around the reset button means it has gotten inside the motor compartment. Symptom: drip below the reset switch, often with a faint burnt smell. The motor will short.
Fix: Replace the disposal — do not run it again, it will trip the breaker or worse.
Typical all-in: $245–$485 installed
Symptom → cause
| If you see this | It's almost certainly | Read more |
|---|---|---|
| Drip from top at sink flange | Sink-flange putty seal failed | Disposal repair |
| Drip from side (dishwasher inlet) | Inlet hose clamp loose or hose cracked | Dishwasher inlet |
| Drip from bottom of disposal body | Internal seal failed — replace unit | Disposal repair |
| Drip from drain elbow | Slip-nut loose or worn gasket | Drain elbow |
| Standing water + slow drain | P-trap or branch drain clog — not disposal | Plumber referral |
| Hums but won't grind + leak | Stuck flywheel + housing crack | Disposal repair |
| Smell + leak | Failed internal seals + food debris | Disposal repair |
| Unit older than 10 years | End-of-life — replacement most economical | Replacement |
By brand
| Brand | Top failure mode | Signature symptom | Brand page |
|---|---|---|---|
| InSinkErator (Badger / Evolution) | Sink-flange putty + body crack at year 8+ | Top leak = flange; bottom = replace unit | Disposal service → |
| Waste King | Inlet gasket + body weld | Side leak from dishwasher inlet | Disposal service → |
| Moen / KitchenAid | Flange + drain elbow | Top + drain-elbow leaks common | Disposal service → |
| GE | Mount assembly + body | Mount-screw loosening over years | Disposal service → |
| Whirlpool | Flange + housing | Leak at sink seal usually | Disposal service → |
| Frigidaire | Body crack + flange | Bottom leak = replace | Disposal service → |
Diagnostic order
Wipe down the entire disposal with paper towels. Especially the top flange, side connections, and bottom.
Don't turn the disposal on yet. Watch the top flange. Drip from the top = sink-flange reseal ($185–$285).
Watch the discharge tube on the side. Drip when it runs = discharge gasket ($185–$245).
Drip only during dishwasher cycle = inlet clamp or gasket (DIY tighten or $185).
Drip from the lowest point = cracked housing, replace ($245–$485). Water around the red reset button = sealed-motor breach, replace immediately.
Knowing the leak source = accurate quote on the phone. Same-day windows weekdays before 2pm.
FAQs
Sink-flange seal failure — plumber's putty hardens and shrinks after 8–12 years. The fix is to drop the disposal, scrape the old putty, lay a fresh bead of plumber's putty around the flange, and re-mount. $185–$285 all-in, 45-minute repair. Don't try to caulk it from above — the leak path is between the flange and the sink.
Cracked motor housing — internal corrosion has eaten through the bottom of the unit. 100% of the time this means the disposal is done; no epoxy or sealant will fix it. Replacement runs $245–$485 installed depending on horsepower. Don't keep running it — the motor will short and trip the breaker.
The dishwasher drain hose clamps to a port on the side of the disposal. The clamp is loose, or the inlet gasket has failed. Re-tighten the clamp first (free). If still leaking, gasket replacement runs $185.
No on housing cracks — it will always come back, often worse, and you risk a motor short. Yes on the discharge gasket / flange bolts (replace the gasket, don't caulk). Sink-flange leaks need plumber's putty (the right material), not caulk or silicone.
Sink-flange reseal $185–$285. Discharge gasket $185–$245. Inlet hose clamp DIY $0 or $185 with gasket. Replacement: Badger 5 (1/2 HP) $245–$345, Evolution Compact (3/4 HP) $345–$445, Pro 750 (1 HP, near-silent) $445–$545. All-in pricing, 1-year warranty.
Top leak on a unit under 10 years = reseal ($185–$285). Side discharge leak on a unit under 10 years = gasket ($185–$245). Bottom housing crack OR water around the reset button = replace, no exceptions. Sub-1/3 HP disposal past year 8 = usually worth upgrading to 3/4 HP for $100 more.
If leak is from the bottom or the housing has rust-through, replace. If from the sink flange or dishwasher inlet, repair the seal. Cost difference is small.
8–12 years on InSinkErator Badger; 12–15 on Evolution / KitchenAid premium units. Hard well water shortens life by 20–30%.
Twin Cities · field notes
Related coverage
See all garbage disposal repair services.
What will this cost?
Trying to decide repair vs. replace? These pages break down real all-in pricing by brand, model class, and failure mode — so you know the number before we knock.
