How to Recycle Coffee Grounds & Tea Bags
Spent coffee grounds, paper filters, and tea bags. Grounds are a free nitrogen source for any pile. Tea bags need checking first, because the bag is often plastic even when the tea is not.
Quick answer
Grounds and paper filters go straight into a pile or worm bin, capped at about 20 percent of the pile by volume. Tea bags are the catch: most are sealed with polypropylene or made from PLA, and even the plastic-free ones usually need industrial composting. Tear the bag open, compost the leaves, and bin the bag unless the maker says home compostable.
- Recyclable
- Yes
- Typical value
- Free for the asking at most coffee shops. Bulk compost sells for roughly $15 to $75 per cubic yard depending on region and product type (Washington Dept. of Ecology, 2025).
- 1Let hot grounds cool before adding them to a worm bin
- 2Toss paper coffee filters in with the grounds; both are on EPA's greens list
- 3Tear tea bags open, compost the leaves, and throw the bag away unless it says home compostable
- 4Pull off metal staples and string tags; EPA's greens list specifies paper tea bags with no staples
- 5For K-Cups, peel the foil, empty grounds and filter into compost, then recycle the plastic cup separately
- 6Spread grounds in thin layers, since thick clumps mat and shed water
- 7Keep grounds under 20 percent of pile volume; above that the caffeine residue can suppress germination
- 8Mix grounds with browns such as leaves, shredded paper, or cardboard
- 9Store grounds in a lidded container if you are not composting them the same day
- 10Ask your local coffee shop for spent grounds; many bag them up on request
- Home compost bins and tumblers
- Worm composting (vermicomposting) bins
- Municipal curbside organics collection
- Community garden composting programs
- Starbucks Grounds for Your Garden (store by store, ask your barista)
- Local coffee shops and cafes (call to arrange pickup)
- Farmers markets with composting booths
- Office composting programs
Used grounds are a green, running 1 to 2 percent nitrogen with a carbon-to-nitrogen ratio around 20:1 to 24:1. Oregon State caps them at 20 percent of pile volume because caffeine residue can suppress germination and slow growth above that. The acid-loving-plants advice is wrong: brewing strips the acidity, and spent grounds land at pH 6.5 to 6.8, near neutral. University of Minnesota Extension says flatly that they do not lower pH, and Missouri Extension notes they can nudge it up. Grounds will not acidify soil for blueberries, azaleas, or hydrangeas, and elemental sulfur is the amendment that does. In a worm bin, grounds work as both feed and grit. Tea bags are a separate problem from the tea: plastic-free is not the same as home compostable, and PLA bags from Clipper, Twinings, and Yorkshire all need the heat of an industrial facility.
Coffee grounds and paper filters are among the few food wastes that need no municipal program at all, since any pile or worm bin takes them and EPA lists both as greens. Tea bags are where the stream leaks. Yorkshire Tea states plainly that 25 percent of its unswitched bag material is polypropylene, and Clipper describes the plastic seal as standard until recently. A 2019 McGill study reported a single plastic teabag shedding around 11.6 billion microplastic particles at brewing temperature, though the count is contested: Germany's Federal Institute for Risk Assessment judged it two to three orders of magnitude too high and counted 5,800 to 20,400 particles itself, and the test used emptied nylon mesh pyramid bags rather than paper ones. The practical takeaway survives the dispute. Loose leaf tea, or leaves tipped out of the bag, avoids the question.
- Work a thin quarter-inch layer into garden topsoil as a slow-release amendment
- Mix into potting soil for containers at 10 to 20 percent by volume
- Feed to worm bins, where grounds double as feed and gizzard grit
- Grow oyster mushrooms on spent grounds
- Keep an open container of dry grounds in the fridge to absorb odors
- Donate bulk grounds to a community garden or urban farm
- Switch to loose leaf tea and skip the bag question entirely
Accepted
- Used coffee grounds (any roast, decaf, flavored)
- Unbleached paper coffee filters (brown or natural)
- Bleached white coffee filters (compostable but slower)
- Paper tea bags with no staples and no heat-seal plastic (check the packaging)
- Loose leaf tea of any kind: black, green, oolong, rooibos, herbal, chai, yerba mate
- Tea leaves tipped out of a bag (compost the leaves, bin the bag)
- Coffee chaff and roasting waste
- Espresso pucks and portafilter grounds
- French press coffee grounds
- Pour-over and drip coffee grounds
- Cold brew coffee grounds
Not Accepted
- K-Cup pods (separate contents first, recycle #5 plastic shell)
- Nespresso capsules (aluminum, recycle through Nespresso program)
- Coffee creamers and dairy products (attracts pests in home bins)
- Sugar packets and artificial sweeteners
- Plastic tea bag wrappers and packaging
- Silken pyramid tea bags (usually nylon or PET mesh)
- PLA and 'plastic-free' bags in a backyard pile (they need industrial heat)
- Tea bags with metal staples (pull the staple first)
- Coffee with milk or cream mixed in (attracts animals in a home pile)
- Disposable coffee cups and lids
- Plastic stirrers and straws
Estimated value: Free for the asking at most coffee shops. Bulk compost sells for roughly $15 to $75 per cubic yard depending on region and product type (Washington Dept. of Ecology, 2025).
Do coffee grounds make compost too acidic?
No. Brewing pulls the acids out into the cup, leaving spent grounds at pH 6.5 to 6.8, near neutral. Oregon State calls the acidity claim a myth outright, University of Minnesota Extension says grounds do not lower pH, and Missouri Extension notes they can even raise it slightly. The practical consequence is that grounds will not acidify soil for blueberries or azaleas. Use elemental sulfur for that.
Can I put too many coffee grounds in my compost?
Yes. Oregon State puts the ceiling at 20 percent of the pile by volume, above which caffeine residue can suppress seed germination and slow plant growth. Grounds are a green, so balance them with browns such as shredded leaves, cardboard, or wood chips. Thick undisturbed layers also mat together and shed water instead of absorbing it.
Are K-Cups and coffee pods compostable?
Not as sold. Standard K-Cups have a #5 plastic shell: peel the foil, empty the grounds and paper filter into compost, then recycle the cup. Some brands sell BPI-certified compostable pods, but BPI certification is a laboratory standard and many composting facilities still refuse those items, so check your facility rather than assuming. Nespresso aluminum capsules go back through Nespresso's own recycling, not compost.
Which tea bags contain plastic?
Yorkshire Tea states that 25 percent of its unswitched bag material is polypropylene, and Clipper describes the plastic heat-seal as standard until recently. Pyramid and silken bags are typically nylon or PET mesh. The trap is that plastic-free does not mean home compostable: Clipper, Twinings, and Yorkshire all use PLA, which is still a plastic and needs industrial heat. Yorkshire says outright that its bags do not belong in a home compost heap. Bigelow states its US bags are largely non-heat-sealed paper with a plant-starch seal. Tearing the bag open and composting only the leaves works regardless of brand.
Can I use coffee grounds directly in my garden without composting?
Yes, as a thin quarter-inch layer worked into the topsoil. Thicker layers crust over and repel water. Skip the common advice to save them for acid-loving plants, since spent grounds are near pH neutral and will not lower your soil pH.
Do coffee grounds attract or repel pests?
Dry grounds scattered as a barrier are not a reliable slug deterrent. What Oregon State found does work is a 1 to 2 percent brewed coffee solution, which kills slugs as a liquid drench rather than as a barrier. Grounds do draw fruit flies if left on the surface, so bury them or cover them with browns.
Where can I get free coffee grounds for composting?
Starbucks has run Grounds for Your Garden since 1995 and it still operates, but participation is store by store and first come, first served, so ask your barista rather than expecting it everywhere. Independent cafes and office break rooms are often the easier source. Bring a container and ask them to set grounds aside.
Recycling centers that accept Coffee Grounds & Tea Bags
RecycleFind lists recycling centers that accept coffee grounds & tea bags. Open a listing for hours, contact info, and directions.