What Not to Compost: 13 Common Mistakes and Safer Alternatives

Composting Is Easy—Until It Isn’t

You’ve set up your sleek new compost bin for apartment use. It fits perfectly on the counter, doesn’t make a sound, and promises odorless composting. You feel like an eco-warrior—until one day, you lift the lid and… yikes. It smells. Bad. Worse yet, it’s full of gunk that isn’t breaking down.

The truth is, composting isn’t a free-for-all. Yes, it’s easy and rewarding. But to keep your indoor compost system running smoothly, you need to know what not to put in it.

Here’s your go-to list of 13 things not to compost, and more importantly, what to do instead.

❌ The “13 Things Not to Compost” List

1. Meat & Bones – These are high in protein and fat, which break down slowly and create unpleasant odors. Worse, they attract flies and pests.

2. Dairy Products – Milk, cheese, and yogurt can sour quickly, turning your composter into a stink bomb.

3. Oily Foods – Oil, butter, and greasy leftovers mess with the microbial balance and can clog filters in electric composters.

4. Citrus Peels (in excess) – While small amounts are fine, too many can make your compost too acidic for microbial activity.

5. Onions & Garlic – Surprisingly, these can disrupt good bacteria and slow the composting process.

6. Plastic-Coated Paper – Think coffee cups and fast-food wrappers—they’re not biodegradable.

7. Pet Waste – Contains pathogens that shouldn’t be in home compost, especially if used on edible plants.

8. Tea Bags with Plastic Mesh – Many commercial tea bags are heat-sealed with plastic, making them non-compostable.

9. Glossy Magazines – The ink and coatings can be toxic to your compost system.

10. Large Bones – These won’t break down in a home system—ever.

11. Shellfish Shells – Decompose extremely slowly and may carry odor.

12. Charcoal Ash – Often contains chemical additives that are harmful to microbes.

13. Synthetics (rubber bands, foil, plastic bits) – Obvious, but easily overlooked.

✅ Safe and Smart Alternatives

Just because there are things you shouldn’t compost doesn’t mean options are limited. You can still create nutrient-rich compost from everyday kitchen scraps by being selective.

Here’s what works great in a compost bin for apartment use:

• Vegetable scraps (carrot tops, broccoli stems, lettuce leaves)

• Fruit peels (in moderation, especially banana and apple)

• Coffee grounds and filters (unbleached)

• Eggshells, crushed for faster decomposition

• Stale bread, rice, and grains (small amounts only)

These items are perfect for odorless composting—they break down efficiently, don’t attract pests, and won’t overwhelm your unit’s filter.

For meat, dairy, or greasy foods, consider:

• Using your city’s food waste collection service if available

• Investing in a dual-bin system where one is for regular compost, the other for tougher scraps

• Using a Bokashi system or microbial enzyme digester as a supplement

Tips for Cleaner, More Efficient Composting

To make the most of your compost bin for apartment, follow these best practices:

• Chop your scraps: Smaller pieces break down faster and more evenly

• Empty regularly: Don’t let waste sit too long

• Clean the unit weekly: Wipe down the lid, bucket, and filter area

• Check the filters: Replace or refresh charcoal filters as needed

• Layer “browns” and “greens”: A balanced mix of dry (paper towels, shredded cardboard) and wet (veggie scraps) helps decomposition

Modern electric composters now come with sensors, odor control filters, and auto-cycling features, making composting smarter than ever—but even the best machine can’t fix a pile full of the wrong stuff.

Final Thought

Knowing what not to compost is just as important as knowing what you can. The 13 things not to compost listed above are common culprits for unpleasant smells, system clogs, and poor compost quality. By following these simple guidelines, you’ll extend the life of your unit, keep your kitchen fresh, and contribute meaningfully to the planet.

Composting is easy—especially when you do it right.