How Do You Remove a Garbage Disposal?
Whether your disposal has finally given out or you are replacing a sink, knowing how to remove a garbage disposal is a straightforward job for most homeowners. There are no special tools required, and the whole process usually takes 30 to 45 minutes if you have not done it before.
This guide walks you through the removal from start to finish, including what to watch for along the way.
Key takeaways:
Always unplug the unit or cut power at the breaker before starting - the wall switch alone is not enough
Disconnect drain lines before releasing the mounting ring, and have a bucket ready for standing water
Most disposals release counterclockwise with about a quarter turn on the mounting ring
Hardwired units require capping the wires after removal - do not leave bare ends exposed
Check whether the existing mounting assembly is compatible with the new unit before removing it
Hard water deposits in East Valley homes can make drain line connections resistant - penetrating oil helps
Corrosion around the sink flange is common in older homes; replace the full mounting assembly if it looks rough
What You Will Need
Bucket and towels
Pliers or channel-lock pliers
Flathead screwdriver
Disposal wrench or hex key (usually came with the unit)
A second set of hands for the final step (optional but helpful)
Before You Start: Safety First
Turn off the disposal at the wall switch, then unplug it from the outlet under the sink. If it is hardwired rather than plugged in, flip the breaker for that circuit at your panel and confirm there is no power before touching any wiring.
Do not skip this step. The disposal switch is not always enough - the outlet under the sink may still be live even when the switch is off.
Step 1: Disconnect the Drain Lines
Place a bucket under the p-trap to catch standing water. There will be more than you expect.
Disconnect the drain line running from the side of the disposal to the p-trap. On most setups this is a slip-joint connection you can loosen by hand or with channel-lock pliers. If your dishwasher drains into the disposal, disconnect that hose as well - it connects to a small inlet port on the side of the unit. Have a towel ready when you pull it loose.
Step 2: Unplug the Unit
If the disposal is plugged into an outlet under the sink, unplug it now. You may need to tilt or partially lower the unit to get to the cord.
If it is hardwired, you will disconnect the wiring after the unit is down. Leave that for Step 4.
Step 3: Release the Disposal from the Mounting Ring
This is where a second set of hands is useful, because the unit is heavier than it looks. Most disposals weigh between 10 and 15 pounds, and they come down quickly once released.
Support the bottom of the disposal with one hand or have someone hold it. Insert the disposal wrench or a flathead screwdriver into one of the mounting tabs on the ring where the disposal connects to the sink flange. Rotate the unit counterclockwise until it releases from the mounting assembly - usually about a quarter turn.
Lower it carefully and set it aside.
Step 4: Handle the Wiring (Hardwired Units Only)
If the unit was hardwired, you will see a wiring cover plate on the bottom of the disposal. Remove the screws, pull the plate off, and disconnect the wires inside. They are typically twist-connected and come apart by hand. Cap the bare wire ends with wire nuts and tuck them safely out of the way until the new unit is installed.
Step 5: Remove the Sink Flange and Mounting Assembly
If you are installing a new disposal, you may be able to reuse the existing mounting assembly - especially if the new unit is the same brand as the old one. InSinkErator/Badger disposals use the same mount, for example, and many units within a brand family are interchangeable.
If you are replacing the sink or want a clean start, remove the mounting ring and flange from underneath the sink. There is a snap ring holding the assembly to the underside of the sink - use a flathead screwdriver to pop it off. The flange will push up through the drain opening from below.
Clean off the old plumber's putty from around the drain opening before installing anything new.
A Few Things to Know for East Valley Homes
If your home is on the older side or has been through multiple owners, there is a decent chance the disposal has not been touched in years. A few things come up regularly in this area:
Hard water mineral deposits can fuse the drain line connections to the disposal ports, making them resistant to turning. A little penetrating oil and patience usually handles it. Do not force a slip-joint fitting with too much torque or you risk cracking the p-trap.
Corrosion around the sink flange is also common, particularly on older stainless sinks. If the mounting ring is badly corroded or the flange does not seat cleanly after removal, it is worth replacing the whole mounting assembly rather than reusing it.
When to Call a Plumber
Removing a disposal is a job most homeowners can handle on their own. Consider calling a plumber if:
The unit is hardwired and you are not comfortable working with electrical
You find water damage, soft cabinet flooring, or mold under the sink that suggests a longer-term leak
The drain line connections will not budge and you do not want to risk cracking the p-trap
You are also replacing the sink or modifying the drain configuration at the same time
Swapping one disposal for another on an existing setup is usually straightforward. Anything beyond a direct replacement tends to get more involved.
Superstition Plumbing has served Mesa and the East Valley for 45 years. If you would rather hand this one off, or if you get into it and find something unexpected, give us a call. We will take a look and give you a straight answer on what it needs.
