Garbage Disposal Is Leaking
A leaking garbage disposal can come from three places: the mounting flange at the top (where it meets the sink), the body of the disposal itself (a crack or failed seal), or the drain connection at the bottom. This can sometimes indicate a failed flange gasket, a corroded disposal body, or a loose drain connection. A leak from the body usually means the disposal needs replacement.
- —Failed mounting flange gasket (where the disposal meets the sink)
- —Corroded or cracked disposal body — not repairable, needs replacement
- —Loose or corroded drain connection at the discharge tube
- —Failed internal seal leaking from the body
Try This First
Safe, simple steps you can try yourself. If any step feels beyond your comfort level, skip it and continue below.
- 1
Dry everything and watch
Wipe the disposal and cabinet dry. Run water and watch where it appears. Is it from the top (flange), the body (crack), or the bottom (drain connection)?
- 2
Check the drain connection
If water drips from where the disposal connects to the drain pipe, tighten the clamp or slip nut. If the discharge tube is corroded, it needs replacing — an inexpensive part.
- 3
Check the mounting flange
If water comes from where the disposal meets the sink, the flange gasket may have failed. This requires removing the disposal to replace the gasket — most homeowners prefer a plumber for this.
- 4
Check the body
If water is weeping from the body of the disposal itself (not a connection), the internal seals have failed or the body is cracked. This is not repairable — the disposal needs replacement.
If the problem is resolved
If tightening the drain connection stops the leak, you've fixed it. Monitor for a few days to confirm.
If the problem persists
If the leak is from the flange, the body, or an internal seal, the disposal needs to be removed and either resealed or replaced. Continue below.
Stop and Call a Plumber If…
- Water is leaking from the body of the disposal — it needs replacement
- The mounting flange is leaking and you're not comfortable removing the disposal
- The cabinet floor is water-damaged or soft
- The disposal is more than 10 years old
- The disposal is also humming, jamming, or not draining properly
- ✓Removing the disposal to replace the flange gasket (if the body is fine)
- ✓Replacing the disposal if the body is corroded or cracked
- ✓Checking the sink flange and mounting hardware for corrosion
- ✓Replacing the drain connection if it's corroded
- ✓Checking for cabinet or subfloor water damage
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Ask the AI PlumberReviewed by Paul Hall, Owner & Licensed Plumber
The Classic Plumber · Knoxville, TN · License #4268. This guidance is general — an onsite inspection may be required for a confirmed diagnosis.