Foods and materials that will jam, clog, or damage your disposal
Your garbage disposal can handle soft food scraps, but it is not a trash can. Putting the wrong things down it will jam the blades, clog your pipes, or break the motor. The most common culprits are starchy foods, fibrous vegetables, grease, and non-food items that people assume are safe because they are small.
The disposal works by spinning blades that shred soft waste into tiny pieces small enough to wash down the drain with water. Anything that does not shred easily, or that expands or hardens as it moves through the pipes, will get stuck. Knowing what to avoid saves you a repair call and keeps your plumbing clear.
Key Takeaways
- Never put grease, oil, or butter down the disposal—they solidify in your pipes and cause blockages even if the disposal grinds them.
- Starchy foods like rice, pasta, and potatoes expand and thicken as they move through the drain, trapping other debris and causing clogs.
- Fibrous vegetables such as celery, corn husks, and onion skins wrap around the blades and jam the motor.
- Bones, shells, pits, and hard seeds will not shred and can crack or break the disposal blades.
- Non-food items including paper, plastic, rubber, and metal should never enter the disposal, even small pieces.
Grease, oil, and butter
Grease is the single worst thing you can put down a disposal. When it is hot, it flows easily and the disposal grinds it fine. But as it cools in your pipes, it hardens into a waxy coating that traps food particles and builds up over time. Even a small amount of grease, repeated, will eventually block your drain completely.
Butter, bacon fat, cooking oil, and meat drippings all behave the same way. Wipe pans and plates with a paper towel before rinsing them. Pour cooled grease into a container and throw it in the trash. If you have already put grease down the disposal and notice slow draining, a plumber can clear it, but prevention is far easier than the repair.
Starchy foods: rice, pasta, and potatoes
Rice and pasta absorb water and swell as they sit in your drain. A small handful of cooked pasta can expand to several times its original size, trapping other food waste and creating a dense clog that is hard to clear. Potatoes break down into a starchy paste that sticks to pipe walls and accumulates.
Bread, oats, and cereal have the same problem—they are designed to absorb moisture. Throw these foods in the trash or compost instead. If you accidentally send a small amount down, run plenty of cold water when ready to try to flush it through before it swells, but do not count on it working.
Fibrous vegetables and fruit skins
Celery, corn husks, asparagus, and leafy greens have long fibers that do not shred. Instead, they wrap around the disposal blades like string around a spindle, jamming the motor and stopping it completely. Onion skins, garlic skins, and carrot peels are thin and stringy for the same reason.
Banana peels, apple peels, and citrus rinds are tougher than they look and can tangle the blades. Pumpkin and squash skin are too hard to shred. Cut these into small pieces and compost them or throw them away. If something wraps the blades, you will hear the disposal strain or stop—turn it off when ready and do not try to force it.
Bones, shells, pits, and hard seeds
Chicken bones, fish bones, and meat bones will not shred. They are harder than the blades and can crack or chip them. Nutshells, crab shells, clam shells, and oyster shells are equally hard. Peach pits, cherry pits, and avocado pits are designed to protect seeds and will not break down in a disposal.
Nuts in the shell, coffee beans, and hard candy also belong in the trash. If you have a large quantity of bones or shells, ask your butcher or fishmonger to dispose of them, or put them in your regular garbage. A broken blade means the disposal will not work at all and will need professional repair.
Non-food items and small objects
Paper towels, napkins, and food labels will not break down and can wrap around the blades. Plastic bags, rubber bands, twist ties, and aluminum foil should never go near the disposal. Small objects like coins, bottle caps, and glass fragments can damage the blades or get stuck in the drain.
Medications, cleaning products, and paint should never go down any drain. Even small pieces of plastic wrap or a rubber gasket from a jar lid can cause problems. Keep the area around your disposal clear and make sure children and pets understand that it is not a toy. If something non-food falls in, turn off the disposal and remove it by hand if you can reach it safely—never put your hand in while the motor is on.
What to do if you have already put something down
If you put something down the disposal and it jams, turn off the switch and do not try to force it. If the motor is still running but the blades are not turning, turn it off when ready. Do not reach into the disposal with your hand or a utensil while it is plugged in.
If the disposal is jammed, you can try turning off the power at the breaker, waiting a few minutes, and then using a wooden spoon or plunger to dislodge the object from above. If that does not work, or if the disposal is making a grinding noise that sounds wrong, call a plumber. Trying to force a jammed disposal can break the motor or cause injury.
Frequently Asked Questions
Can I put eggshells down the garbage disposal?
No. Eggshells are harder than they seem and do not shred well. They can also stick to the sides of pipes and accumulate. Throw them in the trash or compost them instead.
What about coffee grounds?
Coffee grounds are fine in small amounts, but do not make a habit of it. They can accumulate and thicken in your pipes over time. Compost them or throw them away if you can.
Is it okay to put a small amount of grease down if I run hot water?
No. Hot water keeps grease liquid only while it is flowing. Once it cools in the pipes, it hardens and builds up. Even small amounts, repeated, will eventually clog your drain. Wipe grease into the trash instead.
Can I put vegetable scraps down the disposal?
Soft vegetable scraps like cooked squash or soft lettuce are usually fine. Avoid anything fibrous (celery, corn husks, asparagus), starchy (potatoes, squash skin), or hard (carrot peels, beet skins). When in doubt, compost it or throw it away.
What should I do if my disposal smells bad?
Odor usually means food is decaying inside. Run cold water and the disposal for 30 seconds to flush it out. You can also drop in a few ice cubes and run the disposal—the cold helps clean the blades. Avoid putting citrus peels down to mask the smell; focus on not letting food sit in there.