Curbside recycling is a municipal service that collects recyclable materials directly from your home, typically in a bin or cart you set out on a scheduled pickup day. It’s the most common way households in the United States recycle, covering materials like paper, cardboard, metal cans, glass bottles, and certain plastics. Once collected, those materials go to a specialized sorting facility where they’re separated, cleaned, and sold to manufacturers who turn them back into new products.
How Curbside Collection Works
Most curbside programs follow one of two models. In single-stream collection, you toss all recyclables into one bin: paper, plastic bottles, metal cans, glass, and cardboard all mixed together. In dual-stream collection, you separate materials into two groups, typically paper in one container and bottles, cans, and other containers in another.
Single-stream is more convenient and tends to boost participation because residents don’t need to sort anything. But that convenience comes with a trade-off. Mixing everything together leads to higher contamination rates, which means more material ends up rejected and landfilled. When glass breaks in the truck, for instance, shards embed in paper and cardboard, making those fibers harder to sell. Dual-stream programs produce cleaner, drier paper and more marketable materials overall. Processing facilities generally charge municipalities a lower fee for dual-stream loads because they require less sorting and generate less waste.
Some cities that switched to single-stream years ago have reversed course. Officials in several municipalities have cited the rising costs of processing contaminated loads as the reason for returning to dual-stream. As one city put it, “global markets have made single-stream recycling cost prohibitive.”
What You Can Put in the Bin
Accepted materials vary by location, but most curbside programs take a core set of items:
- Paper and cardboard: newspaper, magazines, junk mail, office paper, cardboard boxes, cereal and shoe boxes (called chipboard), paper bags, and egg cartons
- Cartons: milk cartons, juice boxes, and soy or rice milk containers
- Metals: aluminum cans, aluminum foil, tin and steel cans, and empty aerosol cans
- Plastics: bottles and jars marked with resin codes #1 (PET) and #2 (HDPE) are accepted nearly everywhere. Many programs also take #3 through #7, though this is less universal
- Glass: bottles and jars (some programs have stopped accepting glass curbside due to breakage issues, so check locally)
The EPA recommends that plastic, metal, and glass containers be empty and rinsed clean of food debris before going in the bin. Paper should be empty, clean, and dry. A quick rinse is enough for containers; they don’t need to be spotless. For bottle caps, the current guidance is to leave them attached to the bottle. Loose caps are small enough to fall through sorting equipment and jam machinery.
What Should Never Go In
Contamination is the biggest practical problem in curbside recycling, and a few repeat offenders cause the most damage. Garden hoses, holiday lights, extension cords, and similar flexible items are known in the industry as “tanglers.” They wrap around sorting equipment and force the entire facility to shut down while workers cut the material free. Plastic bags and plastic film cause the same problem.
Food waste and yard trimmings (green waste) are also major contaminants. A load of otherwise good recyclables can be sent straight to the landfill if it contains enough organic material. Wet or greasy paper, like a pizza box soaked with oil, can’t be recycled either, though it may be compostable if your area offers that service.
What Happens After Pickup
Your recyclables travel to a materials recovery facility, often called a MRF (pronounced “murf”). This is where the real sorting happens. About 29% of these facilities run fully automated lines with minimal human involvement, 28% rely heavily on manual sorting by workers on a conveyor belt, and 43% use a combination of both.
The process typically starts with screens that separate flat items like paper and cardboard from three-dimensional containers. Magnets pull out steel and tin cans. An eddy current separator, which generates a magnetic field that repels non-ferrous metals, pushes aluminum cans off the belt and into their own stream. Optical sorters use infrared sensors to identify different types of plastic by their chemical makeup, then blast them with jets of air to redirect them into the correct bins. Some newer facilities use AI-equipped robotic arms that can pick individual items off the belt at high speed.
Once sorted, materials are compressed into large bales and sold to manufacturers. The quality of those bales, and therefore their market value, depends heavily on how well consumers prepared and sorted their recyclables before putting them out at the curb.
The Economics of Curbside Recycling
Recycling isn’t always cheaper than throwing things away. Data from North Carolina in 2023 showed that the net cost of recycling ran between $260 and $300 per ton, while the total cost of collecting and disposing of regular trash averaged around $200 per ton. Landfill tipping fees alone averaged $58 per ton nationally that year, with regional averages ranging from $43 to $83.
That cost gap is real, and it’s one reason some communities have scaled back their programs. But the economics look different when you account for the value recycling creates further down the supply chain. Producing aluminum from recycled cans uses 95% less energy than mining and smelting new ore. Recycled copper saves 85% of the energy. Even paper manufacturing uses over 60% less energy when working with recycled fiber instead of virgin pulp. Those energy savings translate into lower greenhouse gas emissions and reduced demand for raw material extraction, costs that don’t show up on a municipal budget spreadsheet but are significant at a societal level.
Revenue from selling baled materials helps offset collection and processing costs, but that revenue fluctuates with global commodity markets. When demand for recycled materials is high, programs can break closer to even. When markets drop, as they did sharply after China restricted imports of recyclable materials in 2018, municipalities absorb the losses or pass them on to residents through higher fees.
How to Make Your Recycling Count
The single most useful thing you can do is keep non-recyclable items out of the bin. One bag of garbage mixed into a recycling cart can contaminate the entire load. Rinse containers, keep paper dry, and break down cardboard boxes so they lie flat. Never bag your recyclables in a plastic trash bag; workers and machines can’t easily open bags, and they often get discarded as trash.
When in doubt about a specific item, leave it out. “Wishcycling,” the habit of tossing something in the recycling bin hoping it’s recyclable, does more harm than good. A single wrong item can reduce the value of an entire bale or cause expensive equipment failures. Your local waste hauler’s website will have the most accurate list of what’s accepted in your area, since programs differ even between neighboring towns.