Why Is My Garbage Disposal Leaking?

Q: I noticed water under my kitchen sink and it looks like it’s coming from the garbage disposal area. Why is my garbage disposal leaking, and how serious is it?

A: A leaking garbage disposal can range from a minor gasket issue to a sign that the unit housing is failing. Common leak points include the sink flange at the top, the side connections where drain pipes and dishwasher hoses attach, and the very bottom of the disposal body. Even small leaks can lead to cabinet damage, swelling wood, and mold over time, so it’s important to track down the source and address it promptly.

1. Safety First: Unplug and Avoid Standing Water

Water and electricity don’t mix. Before inspecting a leak:

• Turn the disposal switch off.
• Unplug the disposal under the sink or shut off its breaker.
• Avoid kneeling in standing water while working around electrical cords.

Once power is off, you can safely look for where the leak is coming from.

2. Dry Everything and Do a Simple Leak Test

To find the source, it helps to start from a dry surface:

• Use towels to dry the disposal body, pipes, and surrounding cabinet floor.
• Close the sink stopper and fill the sink with a few inches of water.
• Remove the stopper and watch under the sink as water drains.

Seeing where water first appears can tell you whether the leak is at the top, side, or bottom of the disposal.

3. Leaks at the Top: Sink Flange Issues

If water appears at the very top of the disposal where it meets the sink:

• The sink flange may have a failing seal or dried-out plumber’s putty.
• Mounting hardware could be loose, allowing water to seep between the sink and flange.

Properly resealing a sink flange often involves disconnecting plumbing and remounting the disposal—a job many homeowners prefer to leave to a pro.

4. Leaks at the Side Connections

Disposals connect to the drain and sometimes a dishwasher with side ports:

• Check the discharge pipe connection for loose screws or worn gaskets.
• Inspect the dishwasher inlet hose (if present) for cracks or loose clamps.
• Look for slow drips while water is actively draining.

Sometimes tightening a clamp or replacing a gasket can solve a minor side leak, but cracked fittings or corroded parts may require component replacement.

5. Leaks at the Bottom of the Disposal

If water drips from the very bottom of the disposal body:

• The internal seals or the disposal housing may be failing.
• Rust, cracks, or corrosion can allow water to escape from inside the unit.

Bottom leaks usually mean it’s time to replace the disposal rather than repair it, as the internal components are not designed to be resealed by homeowners.

6. When to Call Beacon for a Leaking Disposal

You should contact Beacon’s friendly technicians in the yellow polo shirt if:

• You can’t clearly identify where the leak is coming from.
• The leak is at the bottom of the disposal housing.
• You see significant cabinet damage or mold starting to develop.
• You’re uncomfortable loosening or disconnecting plumbing connections.

Our team can pinpoint the source of the leak, repair or replace components, and recommend a new disposal if the old one is beyond safe repair.

Preventing Future Disposal Leaks

To reduce the risk of leaks:

• Avoid overloading the disposal with hard or damaging items that can stress the housing.
• Check under the sink periodically for early signs of moisture.
• Have any unusual noises or vibration addressed before they cause physical damage.

For more help with kitchen sink issues, visit the Garbage Disposal Help Center and explore related topics like disposal draining slowly and disposal making loud noises.