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How to fix a garbage disposal leak

We'll locate the leak, fix the flange gasket or drain connection, and tell you when to call a plumber.

How-to · Home plumbing
30–60 min
What you'll need
  • Replacement sink flange gasket
  • Plumber putty
  • Bucket, towels, channel-lock pliers
  • Screwdriver (for mounting ring)
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Steps

Goal: Shut off power, locate the leak, fix the flange or connections, and know when to call a plumber.

  • Turn off the circuit breaker that powers the garbage disposal. Confirm the disposal does not run when you flip the switch.
  • Good: No power to the unit. Proceed to Locate the leak.
  • Bad: Power still on—find the correct circuit breaker.

Locate the leak

Goal: Identify where the water is escaping.

  • Dry the disposal and the area under the sink with a towel. Run cold water into the sink and turn on the disposal briefly.
  • Watch where water appears—at the sink flange (where the disposal meets the sink), at the drain connection, or at the housing seam.
  • Good: You see water emerge from one or more spots. Proceed to Fix sink flange or Tighten drain connection based on location.
  • Bad: Cannot locate the leak—call a plumber.

Fix sink flange

Goal: Replace the gasket and plumber putty to stop leaks at the sink.

  • Place a bucket under the disposal. Disconnect the drain pipe and dishwasher hose if present. Support the disposal from below, then loosen the mounting ring and lower the disposal.
  • Remove the old gasket and putty. Apply a new bead of plumber putty under the flange and install a new gasket. Reinstall the disposal and tighten the mounting ring.
  • Good: No drips at the sink flange when you run water.
  • Bad: Still leaks—check if the flange is cracked. If cracked, replace the disposal or call a plumber.

Tighten drain connection

Goal: Stop leaks at the drain pipe or dishwasher hose.

  • If the leak is at the drain pipe connection, check that the disposal outlet and drain pipe are aligned. Tighten the slip-joint nut a quarter turn—do not overtighten.
  • If the leak is at the dishwasher hose, check that the hose clamp is snug and the hose is fully inserted. Tighten or replace the clamp if corroded.
  • Good: No drips at the connections when you run water and the disposal.
  • Bad: Connections will not seal or housing is cracked—replace the disposal or call a plumber.

When to get help

Call a plumber if:

  • The housing is cracked and you cannot replace the disposal.
  • The leak persists after tightening.
  • The mounting hardware is corroded or stuck.
  • You are not comfortable with electrical or plumbing work.

Do not work on the disposal with power on.

Verification

  • No drips at the sink flange, drain connection, or dishwasher hose when the water is on and the disposal runs.
  • The disposal mounts securely and drains without leaking.

Where is the leak?

Dry the disposal, run water, turn on the disposal briefly. Watch where water appears—sink flange, drain connection, or housing.

Shut off power. Dry the disposal and area under the sink. Run water and turn on the disposal briefly. Good: you see water at the flange, drain connection, or housing. Bad: cannot locate—call a plumber.

Sink flange Drain connection or housing

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Replace gasket and putty

Lower the disposal, remove old gasket and putty. Apply new putty and gasket. Reinstall and tighten. Good: no leak. Bad: still leaks—check if flange is cracked; call a plumber.

Done

Is the housing cracked?

If housing is cracked, replace the disposal. If leak is at drain or dishwasher hose, tighten connections.

Check the housing for cracks or splits. Cracked: replace disposal or call a plumber. Not cracked: tighten drain connection and dishwasher hose. Good: no leak. Bad: still leaks—call a plumber.

Yes No

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Tighten and test

Tighten drain slip-joint nut and dishwasher hose clamp. Run water and disposal. Good: no leak. Bad: still leaks—call a plumber.

Done

Call a plumber

Call a plumber if the housing is cracked, the leak persists after tightening, or you are not comfortable with the work. Do not work on the disposal with power on.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why does my garbage disposal leak?
Common causes: a worn sink flange gasket, loose drain connection, or cracked housing. The flange seals the disposal to the sink; if the gasket is damaged or the flange is loose, water escapes. Dishwasher hose connections can also leak.
Can I fix a garbage disposal leak myself?
Yes. Most leaks at the sink flange or drain connection are fixable by replacing the gasket, applying plumber putty, or tightening fittings. Shut off power first. If the housing is cracked or you are unsure, call a plumber.
When should I call a plumber for a garbage disposal leak?
Call a plumber if the housing is cracked, the leak persists after tightening, you have a hard-to-reach installation, or water is spraying. Do not work on the disposal with power on.

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