Can you recycle Styrofoam?
Usually no
Not in your curbside bin. Almost no program takes it. The material itself can be recycled, but it has to go to a drop-off or mail-back program.
Follow it down the line
Three different questions hide inside "is this recyclable?", and the answer can change at each step.
The material · Yes
Is the material recyclable?
Expanded polystyrene is technically recyclable, and it is recycled at scale, just not through your bin. Collected foam is compacted, or 'densified', into solid blocks, and the reprocessed material is used as feedstock for rigid polystyrene products including protective packaging, safety helmets, automotive parts and construction materials. The obstacle is never the chemistry. EPS is 92 to 98 percent air by weight, which makes it light and bulky to collect and haul, and that is what gets blamed for the material's weak recycling economics. The industry contests how settled that is, reporting a 31% North American recycling rate for transport and protective packaging, but that figure covers commercial back-of-store material, not what leaves a household. The trade body is blunter about the system as it actually stands: the Association of Plastic Recyclers puts North American collection for this material in Canada only, which means it does not meet the collection accessibility test in APR's own definition of recyclable, or the one in the Federal Trade Commission's Green Guides. Recyclable in principle and recyclable in practice are different claims, and only the first is safe to make here. One more thing is worth knowing, because it decides which pile the foam belongs in. Styrofoam is a DuPont trademark, and what it actually names is extruded polystyrene building insulation, the rigid board sold for walls and foundations. DuPont says so plainly: no cup, food container, cooler or packaging material anywhere is made from Styrofoam brand material. Nearly everything people call Styrofoam is expanded polystyrene instead, a different process and a different product. That is not pedantry, because insulation board commonly carries halogenated fire retardants, and minute amounts of those change how the reprocessed resin flows, so board offcuts are not simply more of the same feedstock.
Sources: Waste Dive: EPS producers say foam recycling is improving, García-Sobrino et al., Polymers 2023 (peer-reviewed), DuPont: Styrofoam is not a cup, Association of Plastic Recyclers: Expanded Polystyrene (EPS) Design Guidance
The facility · No
Will a sorting facility recover it?
This is where Styrofoam fails, and it fails on handling rather than chemistry. Sorting lines are built around rigid containers, paper and metal, and foam is none of those. Facilities treat it as contamination to be screened out rather than a commodity to be recovered. Its structure works against it at both ends: the fine cellular material that makes foam light is also what makes it difficult to break down properly once it reaches processing, so foam that survives collection is still awkward to do anything with. The order of operations inside the plant explains the rest. A modern line sorts by size and shape before it ever asks what a thing is made of. Screens carry flat, two-dimensional items like flattened corrugated one way and let three-dimensional containers drop the other; air classifiers then split light from heavy; magnets and eddy current units pull the metals; and only at the end do optical sorters read the polymer and make the decision people imagine happens first. Foam has no good answer at that opening step, which is why plants pull it off the belt by hand at receiving instead of trusting the machinery to place it. Size finishes the job: anything under roughly three inches in two dimensions tends to fall through the screens and leave with the residue, and foam arrives already breaking into pieces that small.
Sources: RoadRunner: What Is Recycling Contamination?, Atlantic Packaging: Deep Dive, Sorting Recyclables at a Modern MRF
Your curbside program · Rarely
Will your curbside program take it?
Effectively no curbside program in the US accepts foam packaging, and several states and cities have banned foam foodware outright rather than try to recycle it. Putting it in the bin is 'wishcycling': it will be screened out and landfilled, having cost the facility time on the way. Washington is a useful illustration, because the state says both halves out loud. Its environmental regulator describes expanded polystyrene as difficult and expensive to recycle, not accepted in most of the state's residential programs, and handled as a contaminant when it turns up anyway. Rather than build collection for it, the state banned it in stages: foam packing peanuts and other loose fill from June 2023, then portable coolers and foam food service containers, plates, bowls, clamshells, trays and cups from June 2024. Read that as a warning about the shape of the answer rather than as your local rule. A ban on selling foam and a program that will recycle foam are separate things, and neither one implies the other, so the accepted-materials list your own program publishes is still the only thing that settles it.
Sources: SWALCO (Lake County, IL) recycling FAQ, City of Tampa recycling FAQ, Washington State Department of Ecology: Expanded polystyrene ban
What you need to do
- Must be clean and free of tape, labels and food residue
- Block packaging foam is far more likely to be accepted than food containers
- Keep types separate: block foam, peanuts and food foam go to different routes
- Insulation board is a different feedstock from packaging foam. Do not mix the two at a drop-off
Where else it can go
Drop-off densifier locations
Some transfer stations and recycling centers run foam densifiers, which crush and melt clean block foam into dense blocks that are worth freighting. This is the most reliable route where it exists, and it is the same route the commercial recycling figures come from.
Usually clean packaging foam only, not food containers. Call ahead: densifiers break down, and a site can stop taking foam without updating its page.
Mail-back programs
Foam industry associations and some manufacturers run mail-back schemes for clean block foam, which is how people without a local densifier get material into the same stream.
You pay postage, and foam is bulky, so this only makes sense for a large accumulated quantity rather than a single box.
Packing peanuts to shipping stores
Many independent pack-and-ship shops accept clean packing peanuts for reuse. Reuse beats recycling here, since it skips the densifying and reprocessing entirely.
Call first; acceptance varies by shop and by how much they already have. Chains are less likely to take them than independents.
Common mistakes
- Putting foam in the curbside bin because it carries a #6 resin code. The code describes the plastic, not whether anyone will take it
- Assuming food-soiled foam containers are recyclable anywhere; they essentially are not
- Bagging foam before drop-off when the site wants it loose
- Treating blue or gray insulation board from a building project as packaging foam. That board is the real Styrofoam brand product, and the fire retardants in it make it a different material to reprocess
- Expecting small broken pieces to survive the sort. Anything under roughly three inches in two dimensions falls through the screens and leaves with the residue