Your garbage disposal is one of the most used—and most overlooked—appliances in your kitchen. When it’s working properly, you barely notice it.
But when something starts to go wrong, the signs can escalate quickly from minor annoyance to major plumbing problems.
Recognizing early warning signals can help you address small issues before they turn into costly repairs or full unit replacement.
Key Takeaways:
- An explanation of how garbage disposals work
- A list of what you can and can’t put down the disposal
- Tips for avoiding repairs
- Garbage disposal maintenance routine
- Signs your garbage disposal needs maintenance
How Does a Garbage Disposal Work?
A garbage disposal is a motorized kitchen appliance installed under your sink that grinds food waste into tiny particles so it can safely travel through your plumbing system. Despite common belief, it doesn’t have sharp blades. It actually uses spinning impellers and a grinding ring to efficiently break down food.
What Can You Put Down Your Garbage Disposal?
A garbage disposal is designed to handle small amounts of soft food waste, but not everything belongs down the drain. Knowing what’s safe (and what’s not) can prevent clogs, odors, and costly plumbing repairs.
Safe to Put Down Your Garbage Disposal
- Small fruit and vegetable scraps
- Cooked vegetables
- Soft leftovers (without large bones or grease)
- Small pieces of meat (no large bones)
- Lemon, lime, or orange peels
- Ice cubes
- Small amounts of cooked rice or pasta
Items You Should Avoid
- Grease, oil, and fat
- Coffee grounds
- Eggshells
- Celery
- Corn husks
- Onion skins
- Artichokes
- Large amounts of rice and pasta
- Large bones
- Fruit pits
- Paper towels
- Plastic
- Twist ties
- Produce stickers
5 Tips for Keeping Your Garbage Disposal From Needing Repair
Your garbage disposal is an essential tool in your kitchen. It lets you throw random food scraps down so you don’t stink up your kitchen by putting them in the trash, and it makes cleaning up easy.
So it’s important you take good care of your disposal so it lasts a long time and continues doing its job. Below is a list of steps to ensure your garbage disposal continues to work properly for years to come.
1. Run water while the disposal is on.
Whenever you run your garbage disposal, make sure your water is running. Once here, the grinding turns to a soft whir of the motor, then turns the disposal off and keeps the water running for an additional 15 seconds. This will ensure that any leftover particles flush through the pipes.
2. Avoid putting fibrous foods down the drain.
Fibrous foods, like banana peels, can leave stringy fibers in the garbage disposal, which will eventually get stuck and wrapped around the disposal, causing many problems for you down the line.
3. Don’t put glass in your disposal.
Putting glass in your garbage disposal is a popular myth; however, contrary to this belief, it will not sharpen the blades or clean your drain pipes. The only thing it will do is harm your kitchen plumbing.
4. Avoid eggshells and coffee grounds.
Eggshells should be avoided in your garbage disposal, as they can turn into a sand-like substance and sink into the curves of your piping, eventually causing drain clogs. Coffee grounds cause similar problems, except they are already a sand-like substance, so it won’t take as long to create problems.
5. Don’t put bleach into your pipes.
Bleach is an incredibly toxic and caustic chemical that will do more damage to your plumbing than it will clean it. It also hardens grease in your drains, which will eventually block your pipes as it collects.
Your Weekly Garbage Disposal Maintenance Routine
A simple weekly cleaning routine can prevent odors, reduce buildup, and extend the life of your garbage disposal. These methods are safe, inexpensive, and easy to add to your regular kitchen routine.
1. Ice Cube Cleaning Method
Many people think ice “sharpens the blades,” but garbage disposals don’t actually have sharp blades. Instead, ice works by knocking loose grease and food buildup from the grinding chamber and impellers.
As the cubes tumble around inside the unit, they help dislodge debris stuck to the sides.
How to do it:
- Pour 1–2 cups of ice cubes into the disposal.
- Turn on the cold water.
- Run the disposal until the ice is fully ground.
Optional: Add a handful of rock salt along with the ice. The coarse salt acts as a gentle abrasive, helping scrub away stubborn residue.
2. Baking Soda and Vinegar Flush
This natural combination helps neutralize odors and loosen grime without using harsh chemicals that can damage pipes.
Step-by-step process:
- Turn off the disposal.
- Pour ½ cup of baking soda into the drain.
- Add 1 cup of white vinegar.
- Let the mixture fizz and sit for 5–10 minutes.
- Flush thoroughly with hot water.
- Run the disposal briefly with cold water to clear any loosened debris.
3. Citrus Peel Freshener
Citrus peels (such as lemon, lime, or orange) can act as natural deodorizers. The oils released during grinding leave behind a fresh scent.
How to use:
- Drop in a few small citrus peels.
- Run cold water and turn on the disposal.
Important: Citrus only masks odors temporarily. If smells persist, there may be trapped food or buildup that requires deeper cleaning.
4. Cleaning the Splash Guard
The rubber splash guard is one of the most common sources of lingering odors. Food particles often collect underneath its flaps and go unnoticed.
Safe cleaning method:
- Turn off and unplug the disposal (or switch off the power at the breaker).
- Gently lift the splash guard flaps.
- Use a long-handled brush or an old toothbrush with mild dish soap.
- Scrub underneath and around the folds.
- Rinse thoroughly with warm water.
Cleaning the splash guard alone can dramatically reduce unpleasant smells and is often the most overlooked step in garbage disposal maintenance.
Looking for more homeowner maintenance tips? Check out this blog.
7 Signs Your Garbage Disposal Needs Attention
Your garbage disposal works hard behind the scenes—so when something feels “off,” it’s usually worth investigating early. Catching small issues before they become major problems can prevent clogs, leaks, and costly repairs.
Here are the most common warning signs to watch for:
1. Humming Noise but No Grinding
If you hear a humming sound but the disposal isn’t spinning, the motor is likely running, but the flywheel is jammed. This often happens when a hard object (like a fruit pit or utensil) gets lodged inside. Ignoring it can cause the motor to overheat and lead to permanent damage.
2. Slow Draining Sink
If water backs up or drains slowly when you run the disposal, a clog may be forming in the drain line. Food sludge, grease buildup, or fibrous materials are common culprits. Slow drainage is usually an early warning sign of a full blockage.
3. Persistent Foul Odors
If your sink smells bad even after running the disposal, food particles may be trapped inside the grinding chamber or under the splash guard. Lingering odors can also signal buildup further down the drain line. A deep cleaning may fix it, but persistent smells could indicate a larger plumbing issue.
4. Frequent Need to Press the Reset Button
Most disposals have a small red reset button on the bottom of the unit. If you’re constantly resetting it, the motor may be overheating due to:
- Overloading
- Internal jams
- Aging components
Repeated resets are a sign that the unit may be nearing the end of its lifespan.
5. Loud or Unusual Noises
A disposal should make a consistent grinding sound—not rattling, screeching, or metal-on-metal noises. Unusual sounds often mean:
- A foreign object is inside.
- Internal components are loose.
- The grinding ring is damaged.
Shut it off immediately if you hear anything abnormal.
6. Leaks Under the Sink
Water pooling beneath the disposal can come from:
- Loose plumbing connections
- Worn seals
- Cracks in the disposal housing
Leaks should never be ignored. They can lead to cabinet damage, mold growth, and more expensive repairs. Contact Coast Plumbing right away if you notice a leak.
7. Disposal Won’t Turn On at All
If the unit is completely unresponsive, check:
- The power source
- The reset button
- The breaker panel
If it still won’t start, the motor or wiring may have failed.
When to Take Action
If you notice one of these signs occasionally, a simple cleaning or reset may solve the issue. But if problems are recurring or getting worse, it may be time for professional service, or even replacement if your unit is over 8–12 years old.
Addressing these warning signs early can save you from emergency plumbing calls and keep your kitchen running smoothly.
Count on Coast Plumbing for Garbage Disposal Maintenance
If you ever have any drain problems, whether a blockage or a leak, call Coast Plumbing, Heating & Air. We have been serving Orange County residents for over three decades and in that time have become the #1 service company. No matter how complex or how simple your plumbing issues are, you can depend on us for high-quality, effective services that will never compromise on customer satisfaction.
Call Coast Plumbing, Heating & Air at or contact us online today to schedule a garbage disposal maintenance or repair service in Fountain Valley or Orange County!