Only about 8.7% of plastic waste in the United States actually gets recycled, according to EPA data. That’s not because recycling doesn’t work. It’s largely because people aren’t sure which plastics qualify, how to prepare them, or what happens when the wrong item ends up in the bin. Getting it right is straightforward once you know the basics.
What the Numbers on Plastic Mean
Every plastic container has a small number (1 through 7) stamped inside a triangle on its bottom. This is the resin identification code, and it tells you what type of plastic the item is made from. The number doesn’t automatically mean an item is recyclable, but it’s the starting point for figuring out whether it belongs in your bin.
- #1 (PET or PETE): Water bottles, soda bottles, and many prepared-food containers. This is the most commonly recycled plastic and is accepted by nearly all curbside programs.
- #2 (HDPE): Milk jugs, detergent bottles, household cleaner bottles. Also widely accepted in curbside recycling. You’ll recognize it as the opaque, somewhat rigid plastic.
- #3 (PVC): Shampoo bottles, some toys, certain detergent containers. More difficult to recycle than #1 and #2, and many programs don’t accept it.
- #4 (LDPE): Thin, flexible plastic like grocery bags and bread bags. This type can clog the machinery at recycling facilities, so most curbside programs reject it. Many grocery stores have drop-off bins specifically for LDPE bags and film.
- #5 (PP): Yogurt cups, soft-drink cups, straws, and some food containers. Recyclable in some communities but not all.
- #6 (PS): Styrofoam takeout containers and disposable cups. Generally not accepted in recycling programs.
- #7 (Other): A catch-all for everything else, including polycarbonate and some bio-based plastics. Rarely recyclable through standard programs.
The safest bet: plastics #1 and #2 with a neck (like bottles and jugs) are accepted almost everywhere. For anything else, check your local program’s guidelines before tossing it in the bin.
How to Prepare Plastics for the Bin
Preparation sounds tedious, but it takes seconds and makes a real difference. When a recycling load is too contaminated, the entire truckload gets redirected to the landfill. That means your carefully sorted recyclables go to waste because someone else threw in a greasy pizza box or a half-full yogurt container.
Empty your containers completely. You don’t need to scrub them spotless, but give them a quick rinse to remove visible food residue. A peanut butter jar with a thick coating inside, for example, should get a swirl of water. Leave the caps on. Recycling facilities used to ask people to remove bottle caps, but the current guidance is to twist caps back on so they don’t get lost in the sorting equipment. Remove any paper labels if they peel off easily, but don’t worry about glued-on labels since the washing stage at the recycling facility handles those.
One important rule: keep plastics dry. Wet recycling attracts mold and can contaminate paper and cardboard in the same bin. If you rinse a container, give it a shake before tossing it in.
Why “When in Doubt, Throw It Out” Matters
The instinct to recycle everything that looks like plastic is understandable, but it causes real problems. Putting non-recyclable items in the recycling bin, sometimes called “wish-cycling,” contaminates entire loads. Plastic bags are one of the worst offenders. They wrap around sorting equipment and can shut down processing lines. Garden hoses, plastic toys, and styrofoam all cause similar issues.
Compostable plastics are another common source of confusion. Items made from plant-based plastics like PLA often look identical to conventional plastic containers. They sometimes carry a #7 resin code with “PLA” printed beneath it, or carry a compostability certification logo. These do not belong in your recycling bin. They need industrial composting facilities, which operate at higher temperatures than your backyard compost pile. When compostable plastics mix into the recycling stream, they degrade the quality of the recycled material.
What Happens After Pickup
Once your recycling reaches a materials recovery facility, it goes through a multi-stage process. First, items are sorted by type. Even though you’ve already separated recyclables at home, the facility sorts further by color and thickness, since different colors and grades of the same plastic type melt at slightly different temperatures.
Next, the plastics are shredded into small flakes. These flakes go through a washing stage that removes remaining dust, food traces, adhesive from labels, and other residue. After washing, the flakes are sorted a second time for quality control, removing any pieces that don’t meet standards. Finally, the clean flakes are melted and extruded into uniform pellets. These pellets are the raw material that manufacturers buy to make new products: bottles, containers, polyester fiber for clothing, or plastic lumber.
This process, called mechanical recycling, works well for clean, single-type plastic streams. It’s why keeping different plastic types separate and free of contamination matters so much at the consumer level. Every stray item that makes it through to the wrong stage degrades the quality of the final pellets.
Chemical Recycling for Hard-to-Process Plastics
Some plastics that can’t be mechanically recycled have another path. Chemical recycling breaks plastic down at the molecular level rather than just melting and reshaping it. The most common method, pyrolysis, heats plastic waste without oxygen to produce fuel and chemical feedstocks. Other approaches include gasification and depolymerization.
The advantage is flexibility. Unlike mechanical recycling, chemical recycling can potentially process mixed plastic types together, including films, flexible packaging, and multi-layer plastics that would otherwise go to landfill. These facilities are still limited in number, but they represent a growing option for the plastics that your curbside bin can’t handle.
The Chasing Arrows Are Changing
For decades, the triangular “chasing arrows” symbol on plastic packaging has misled consumers into thinking an item is recyclable when it often isn’t. The symbol was originally designed just to identify the resin type, not to signal recyclability. California’s SB 343, enacted in 2021, is changing that. The law prohibits manufacturers from putting the chasing arrows symbol or any recyclability claim on products unless the items are actually collected and processed for recycling in the state. Labeling restrictions apply to products manufactured after October 4, 2026.
Under the law, CalRecycle publishes data on which materials are genuinely recycled in California, and manufacturers must use that data to determine whether their labels are accurate. After each updated study, companies have 18 months to adjust their packaging. This means the recycling symbols you see on store shelves will gradually become more reliable indicators of what actually belongs in your bin, at least in states that adopt similar rules.
A Quick Recycling Checklist
- Check the number: #1 and #2 plastics are almost universally accepted. For #3 through #7, verify with your local program.
- Empty and rinse: Remove food residue with a quick rinse. No need for soap.
- Leave caps on: Twist bottle caps back on before recycling.
- Keep bags out: Return plastic bags and film to grocery store drop-off bins instead of curbside recycling.
- Skip styrofoam: Polystyrene (#6) is rejected by most programs.
- Watch for compostables: Look for “PLA” under the #7 symbol or compostability logos. These need composting, not recycling.
- When unsure, trash it: One contaminated item can send an entire load to the landfill.