4 ways to fix a garbage disposal that’s leaking from the bottom

If you’ve noticed water pooling under your sink, chances are your garbage disposal is leaking from the bottom. Don’t worry, it’s a common problem, and you can often fix it yourself with a few tools and a bit of patience. Whether it’s a loose connection, worn-out seals, or something more serious, this guide will walk you through the steps to get your disposal back in working order. Let’s roll up our sleeves and tackle that leak!

The information in this article may not apply to your specific appliance model. For the most accurate guidance, it’s best to check your manufacturer’s documentation or reach out to us if you’ve got any questions.

Cause 1: Worn-out internal seals or gaskets

One of the most common reasons for a garbage disposal leaking from the bottom is worn-out internal seals or gaskets. These parts are designed to keep water inside the unit, but over time, they can deteriorate or shift out of place, leading to leaks.

How to diagnose the issue:

1. Turn off the power to the garbage disposal by unplugging it or switching off the breaker.
2. Look for water dripping directly from the bottom of the disposal unit, especially when water is running in the sink.
3. Check if the leak occurs only when the disposal is turned on, as this can indicate an issue with the seals near the motor.

How to fix worn-out seals or gaskets:

1. Detach the disposal from the sink flange by turning it counterclockwise.
2. Place a bucket or towel underneath to catch any residual water.
3. Open the disposal’s casing according to your unit’s manual (this often involves unscrewing the bottom housing).
4. Locate the seals or gaskets that sit between the upper and lower sections of the disposal.
5. Remove the old, worn-out seals and clean the surrounding areas to ensure a proper fit for the new parts.
6. Install replacement seals or gaskets that match your disposal model.
7. Reattach the bottom housing, ensuring all screws are tightened securely.
8. Reinstall the disposal onto the sink flange.
9. Run water into the sink and operate the disposal to check if the leak has stopped.

Cause 2: Cracks in the disposal housing

Over time, the housing of your garbage disposal, especially the lower section near the motor, can develop cracks due to wear, age, or accidental impact. These cracks can allow water to seep out from the bottom.

How to diagnose the issue:

1. Turn off the power to the disposal by unplugging it or flipping the breaker.
2. Dry the outside of the disposal and then run water through the sink. Observe carefully to see if water starts to seep or drip from the lower housing.
3. Use a flashlight to inspect the housing for visible cracks or hairline fractures.

How to fix cracks in the disposal housing:

1. For small cracks, clean the area around the crack thoroughly with a dry cloth.
2. Apply a waterproof epoxy or sealant specifically designed for plumbing repairs. Ensure the sealant covers the entire crack.
3. Allow the epoxy or sealant to cure completely according to the product instructions.
4. Test the disposal by running water through the sink and checking for leaks.

If the housing is significantly damaged, the disposal is likely beyond repair. You’ll need to replace the entire unit. Choose a disposal that matches the specifications of your existing plumbing and sink setup.

Cause 3: Loose or damaged drain pipe connection

The drain pipe that carries wastewater from your garbage disposal to your plumbing system can loosen over time or develop leaks due to wear and tear. This connection is often secured with bolts, gaskets, or compression fittings, and any failure in these parts can result in water leaking from the bottom of the disposal.

How to diagnose the issue:

1. Inspect the area where the drain pipe connects to the garbage disposal.
2. Run water through the sink and check for drips or water pooling around the connection point.
3. Wiggle the drain pipe slightly to see if it feels loose.

How to fix a loose or damaged drain pipe connection:

1. Turn off the power to the disposal by unplugging it or flipping the breaker.
2. Use a wrench or screwdriver to tighten the bolts or compression fittings securing the drain pipe to the disposal. Ensure the connection is snug but not over-tightened.
3. If tightening doesn’t stop the leak, the gasket inside the connection might be worn or damaged.
4. Disconnect the drain pipe and remove the old gasket.
5. Clean the area around the connection and install a new gasket that fits your disposal model.
6. For extra security, wrap plumber’s tape around the threads of the connection point before reattaching the pipe.
7. Reattach the drain pipe and tighten the fittings securely. Run water through the sink to check if the connection is now watertight.

Cause 4: Faulty dishwasher connection

If your garbage disposal is connected to a dishwasher, a leak from the bottom of the unit could be caused by a loose, damaged, or improperly sealed dishwasher hose connection. This connection allows wastewater from the dishwasher to flow through the disposal, and any issue here can lead to leaks.

How to diagnose the issue:

1. Locate the dishwasher hose connection on the side of the garbage disposal.
2. Run the dishwasher or turn on the sink and observe the area for drips or water pooling around the hose connection.
3. Inspect the hose for cracks, wear, or signs of improper seating.

How to fix a faulty dishwasher connection:

1. Turn off the power to the disposal by unplugging it or flipping the breaker.
2. Locate the dishwasher drain hose connection on the side of the disposal.
3. Use a screwdriver to tighten the hose clamp, ensuring it securely holds the hose in place.
4. Replace a damaged hose or clamp with a compatible part if they are damaged.

If you suspect the connection isn’t watertight, apply a small amount of plumber’s tape around the disposal’s inlet before attaching the hose. This can help create a tighter seal and prevent leaks.

Additional help

Thank you for reading! Need replacement parts? Grab your model number and visit AppliancePartsPros.com. With over two million parts available, most orders arrive in just two business days. For help finding the right part or placing an order, call our team at 1 (877) 477-7278.

While you wait for your part, explore our DIY blog and browse thousands of video tutorials on our YouTube channel.

Follow us on Facebook, Twitter, and Instagram for repair guides and updates!