What Not to Put in Compost at Home: Meat, Dairy, Oil, Pet Poop
Orange peels and onion skins are fine. The things that actually wreck a small home compost bin are meat, bones, dairy, oily food and pet poop, because they bring rats, maggots and germs that a balcony bucket never gets hot enough to kill. Here’s what not to put in compost at home, what’s a “maybe”, and the myths that make people throw good peels in the dustbin.
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What not to put in home compost, and why
A big farm heap cooks at 55 to 65°C in the middle, hot enough to kill most germs and weed seeds. A 20 litre bucket on a balcony stays close to air temperature. So the rule for a small bin is simple: if it would attract rats, rot into a stink, or carry germs you don’t want near food plants, keep it out.
| Item | Verdict | Why |
|---|---|---|
| Meat, fish, bones | No | Rats, cats, maggots, rotten smell |
| Milk, dahi, paneer, ghee | No | Sour smell, attracts pests |
| Oily curry, fried food, used oil | No | Coats everything, slows rotting, draws rats |
| Cooked rice, roti, daal leftovers | Maybe | Small amounts buried deep; large amounts go mouldy and smell |
| Dog or cat poop, cat litter | No | Worm eggs and parasites survive a cool bin |
| Diseased plants, weeds in seed | No | Disease and seeds survive, then spread in your pots |
| Coal ash, charcoal briquettes | No | Can carry harmful metals and sulphur |
| Plain wood ash (chulha) | Maybe | A light sprinkle only; it’s strongly alkaline |
| Glossy paper, printed cartons, paper cups | No | Plastic coatings and heavy inks |
| “Biodegradable” plastic bags | No | Most need factory composting; some just crumble into microplastic |
| Citrus and onion peels | Yes | Fine in normal kitchen amounts, chopped |
| Eggshells | Yes | Rinse and crush; they break down slowly |
Why meat, dairy and oily food are the big no
These are the rich foods, and every creature in the neighbourhood knows it. A chicken bone in a bucket can bring a rat up two floors of drainpipe. Dahi and paneer go sour and slimy long before they rot. Oil is the sneaky one: a spoonful of leftover salan seems harmless, but the oil coats the peels around it, keeps air out and turns that corner of the bin into a smelly, greasy lump that sits there for months.
The fix is to not make these leftovers in the first place, or to eat them the next day. Our guide to peels, stems and leaves you can eat is a good first stop before anything goes in the bin.
What about cooked rice, roti and daal?
This is the honest grey area. Small amounts of plain cooked food (a spoon of rice, a torn piece of stale roti) buried deep under browns usually break down fine. A whole plate of leftover biryani will go mouldy, sour and attract rats. If you have lots of cooked leftovers, bokashi, a Japanese method that ferments food in a sealed bucket with treated bran, handles cooked food and meat far better than an open compost bucket, though the result still needs burying in soil to finish.
Pet poop and human waste: never in a food-plant bin
Dog and cat droppings can carry roundworm eggs and, in cats, a parasite called toxoplasma, which matters especially in pregnancy. These survive happily in a cool home bin and then end up in the pot where you grow pudina or dhania. Used cat litter falls in the same category, whatever the pack says. Human waste, including nappies, is never for a home bin. Composting toilets are a separate, designed system, and their output isn’t for edible plants in a flat.
Same idea for anything from a sick animal’s bedding, and for medicines of any kind. Old tablets and syrups go back to a pharmacy or into the household rubbish sealed in a bag, never into compost or down the drain.
The sneaky “no” list people miss
- Tea bags: many contain a fine plastic mesh or plastic in the seal. Tear them open, compost the leaves, and bin the bag. Loose chai patti is better; rinse off milk and sugar first so ants don’t come.
- Fruit stickers: they’re plastic and will turn up in your finished compost for years.
- Glossy or coloured paper: magazines, shiny gift wrap, printed juice and milk cartons, and paper cups, which usually have a thin plastic lining.
- “Compostable” bags: most are certified for industrial plants that run hot for weeks, not for a balcony bucket. Line your kitchen caddy with newspaper instead.
- Treated wood sawdust: plywood, painted or polished wood dust can carry chemicals. Untreated sawdust in thin layers is fine.
- Weeds with seeds and doob grass roots: both survive and sprout wherever you spread the compost.
- Salty or heavily spiced leftovers: salt in bulk harms soil life and pot plants.
Myth: citrus and onion peels will ruin your compost
They won’t. The worry comes from worm bins, where worms dislike large amounts of citrus and onion, and got stretched into a rule for all compost. In an ordinary bin, normal kitchen amounts break down fine; just chop them and mix them in with the other scraps rather than dumping a whole bag of kinnow peels at once. Orange peel has plenty of other uses before it ever reaches the bin, from zest to cleaning, covered in our orange and kinnow peel guide.
Eggshells are the other half of this myth, in reverse. They’re perfectly safe in compost, but they don’t vanish in weeks the way videos suggest. Expect to see flecks in your finished compost. That’s harmless calcium.
- Eggshells: rinse, dry on a plate for a day, then crush fine in your hand or a mortar before adding.
- Citrus peels: chop into 2 to 3 cm pieces and mix with other scraps; no more than about a quarter of any one lot.
- Onion and garlic skins: add freely; the dry papery outer skins even count partly as browns.
- Used chai patti: rinse under the tap in a strainer, squeeze, and add.
- Stale roti: tear small and bury under at least 5 cm of browns, a few pieces at a time.
If you’re unsure, leave it out; a slower bin is better than a bin with rats. Wear gloves if you’re pregnant and wash hands with soap after handling compost. Keep toddlers and pets away from the bin, and never compost pet droppings for pots that grow food. If a child has eaten compost or anything from the bin, rinse the mouth, and call a doctor if they vomit, have a fever or seem unwell, or if you know something like old medicine went in.
Once you know what stays out, here’s how to set up the bin itself: how to make compost at home in a flat. For worm bins, which are fussier still, see our vermicompost guide. Everything else on cutting kitchen waste lives in Zero-Waste Kitchen.
What goes in compost and what doesn’t: common questions
What not to put in a home compost bin?
Meat, fish, bones, dairy, oily food, pet poop, cat litter, diseased plants, weeds in seed, coal ash and glossy or plastic-coated paper. These bring rats, smells or germs that a small bin can’t break down safely.
Are onion peels good for compost?
Yes. Onion and garlic skins break down well in an ordinary compost bin. Only worm bins need them kept to small amounts.
Are orange peels good for compost?
Yes, in normal kitchen amounts. Chop them and mix them with other scraps; a huge pile of citrus at once makes the bin sour and slow.
Can I put cooked food in compost?
Only small amounts of plain cooked rice, roti or daal, buried deep. Oily curries, meat and large amounts of leftovers attract rats and smell; bokashi suits cooked food better.
Can eggshells go in compost?
Yes. Rinse, dry and crush them first. They add calcium and break down slowly, so you’ll still see small bits later.
Can I compost dog or cat poop?
Not in a bin whose compost goes on food plants. Pet droppings can carry worm eggs and parasites that survive in a cool home bin.
Are tea bags compostable?
Many aren’t, because they contain a fine plastic mesh or seal. Tear them open, compost the leaves and bin the bag.
Can I put newspaper in compost?
Plain newsprint, torn or shredded, is widely used as a brown. Skip glossy magazine pages and shiny coloured supplements.
Is wood ash good for compost?
Plain wood ash from a chulha is fine as a light sprinkle, since it’s strongly alkaline. Coal ash and barbecue briquette ash should stay out.
Are biodegradable bags OK in home compost?
Usually not. Most are made for hot industrial composting, and some just break into tiny plastic bits. A newspaper-lined caddy is a safer choice.
Can I compost hair and nail clippings?
Yes. Human hair and nail clippings break down slowly, and so does pet fur from a brush. Mix them in loosely rather than as a clump.