Post By Admin
May 16, 2025When your garbage disposal is backed up, water can start gurgling up instead of going down and that’s never a good sign!
Whether it’s a simple clog or something a bit more sinister, we’re here to help you troubleshoot the mess and walk you through the fix.
And if DIY isn’t your style, there’s always a reliable plumbing maintenance service that can handle the dirty work for you.
Common Causes of Clogged Garbage Disposal
Okay, now that we’re in fix-it mode, let’s get to the bottom of what’s actually causing your garbage disposal to back up other than just food scraps.
So, disposals are built to grind, but they’re not invincible.
Over time, they can clog up from misuse, lack of cleaning, or just regular wear and tear.
Here are some of the most common culprits behind a smelly garbage disposal or one that just won’t drain properly:
1. Too Much Food Waste at Once
Dumping a mountain of food scraps all at once can overwhelm the blades and lead to a clog.
Potato peels, pasta, rice, or corn husks are notorious for causing blockages and sending water coming back up from the garbage disposal.
2. Grease and Oil Build-Up
Pouring hot grease down the disposal might seem harmless. However, it solidifies into a gross sludge that clings to your pipes and gums up the works.
Over time, this buildup narrows the drain and causes a garbage disposal backup that’s both messy and smelly.
3. Foreign Objects Falling In
Spoons, bottle caps, or even small non-food items can jam the blades or block the drain.
This can lead to the dreaded disposal backing up and chaos in your sink.
4. Lack of Regular Cleaning
If your disposal hasn’t been cleaned in a while, bacteria and food residue can accumulate.
You might expect foul smells and poor drainage as it indicates a red flag that something’s stuck in there.
5. Clogged Drain Line
A clog further down the pipe can create a backup that makes it look like your disposal is to blame.
How to Unclog Garbage Disposal
Alright, now that we know what’s likely clogging things up, let’s talk about how to clear it. Here’s how to tackle the problem head-on:
1) Turn Off the Power (Safety First!)
Before you touch anything, flip the switch on the wall and turn off the power to your disposal at the breaker.
You do not want the disposal turning on while you’re poking around inside.
Double-check that it’s off by flipping the switch and listening for silence. If you don’t hear any hum, then it’s safe to proceed.
2) Use Tongs or Pliers to Remove Visible Blockages
Take a flashlight and peer down into the disposal. See any food scraps clogging things up? If so, grab some long-handled tongs or pliers and carefully pull out whatever you can.
This alone might stop water coming back up from the garbage disposal. Keep an eye out for non-food items too!
3) Try the Reset Button
If the disposal has overheated or tripped itself due to a clog, pressing the tiny red button on the bottom of your disposal unit can bring it back to life.
Just press it once and wait a few seconds before turning the disposal back on. If it clicks, it means it was tripped.
4) Use an Allen Wrench to Manually Rotate the Blades
Most disposals have a slot underneath where you can insert a ¼-inch Allen wrench. Give it a few clockwise turns to dislodge any stuck debris that’s jamming up the works.
If there’s a clog, you’d feel some resistance. Just keep turning gently until it loosens.
5) Flush It Out with Hot Water and Dish Soap
Got the clog cleared? Great! Now let’s wash it all down. Plug the sink, fill it halfway with hot water, add a squirt of dish soap, then pull the plug while the disposal is running.
The weight and pressure of the water can help flush out lingering debris.
6) Baking Soda and Vinegar for the Stubborn Stuff
Still having trouble? Pour ½ cup of baking soda followed by 1 cup of vinegar down the disposal. Let it fizz for 10–15 minutes then flush with boiling water.
7) Use a Plunger (Yes, Really)
If nothing else is working and your garbage disposal backup is still giving you grief, try using a sink plunger.
Block the second sink drain (if you have a double sink), add a few inches of water, and plunge over the disposal drain to force the clog loose.
FAQ About Backed-Up Garbage Disposal
So, you’ve tried a few fixes, but maybe you’re still scratching your head or wondering, “Did I do that right?”
To help you feel a little more confident around your sink, let’s tackle the most frequently asked questions homeowners like you often ask when dealing with this kind of mess.
1. How to unjam a garbage disposal?
If your disposal is humming but not spinning, chances are it’s jammed. First and foremost, turn off the power to the unit for safety. Then, take a flashlight and look inside for any visible obstructions.
If you have a ¼-inch Allen wrench, insert it into the slot on the bottom of the disposal unit and turn it back and forth gently.
This motion can help dislodge whatever is stuck. Once it feels loose, press the reset button on the bottom of the unit and test it again.
2. What happens when a garbage disposal backs up?
When your garbage disposal backs up, you’ll usually notice water pooling in the sink or coming back up through the disposal opening.
Sometimes, the sink might drain slowly, or not at all, especially when the disposal is turned on.
This often means there’s a clog either inside the disposal unit or further down the kitchen drain line. In more stubborn cases, the backup can even trigger a foul odor, especially if food scraps have been stuck for a while.
3. Will boiling water unclog garbage disposal?
Boiling water can help loosen light grease or residue buildup, but it won’t always unclog a serious garbage disposal backup.
If you’ve already tried clearing out any debris or used baking soda and vinegar, pouring a full pot of boiling water slowly down the drain might help wash down any remaining gunk.
Just make sure the disposal isn’t running while you do it, and be cautious not to splash.
Also Read: Garbage Disposal Maintenance Tips You Should Know
Conclusion
A garbage disposal backed up can start to get a little unpredictable, like mystery smells and water coming up where it shouldn’t!!
Luckily, you’re now armed with the know-how to handle it like a pro. With the right approach, you can usually get things flowing again without needing to tear your kitchen apart.
But hey, not every disposal disaster is a solo mission! If things still aren’t moving, or you’re tired of mystery gurgles and weird water behavior, it might be time to call the experts at Neighbourhood Plumbing.
We also offer plumbing maintenance which involves routine care that can keep your pipes clear, disposal running smoothly, and kitchen smelling fresh!
We’re just a call away and ready to tackle even the most stubborn sink standoffs. Dial 0488 885 122 now!
About the Author
From unclogging the toughest drains to repairing leaking toilets, Ricky is a seasoned plumber who has brought his craftmanship to homes across Melbourne. He is passionate about sharing plumbing tips just as much as he is about fixing your plumbing issues. So, when your taps or pipes begin leaking, you know who to call.
