How Paper Recycling Works

Most curbside recycling in the United States is "single-stream," meaning everything — cardboard, plastic bottles, aluminum cans, paper, glass — goes into one bin. That mixed load gets picked up and taken to a facility called a Materials Recovery Facility, or MRF (pronounced "murf").

At the MRF, the mixed material flows onto a series of conveyor belts. The first job is a rough presort: workers and machines pull out items that would jam equipment — plastic bags, oversized objects, things that obviously don't belong. From there, rotating screens called trommels separate flat, two-dimensional materials (paper, cardboard) from three-dimensional containers (bottles, cans). Magnets pull out steel. Eddy current separators handle aluminum. Optical scanners identify different types of plastic.

Paper gets its own sorting line. High-grade papers — office paper, white ledger — are separated from mixed paper, newsprint, and cardboard, because paper mills pay different prices for different grades and won't accept contaminated bales. Once sorted, each category is compressed into dense bales weighing roughly a thousand pounds and sold to paper mills and manufacturers as raw material feedstock.

That's where the real recycling happens: at the mill, the paper bales are mixed with water to create a slurry called pulp, then cleaned, treated, and reformed into new paper products. The process is water-intensive, and whatever is in that pulp — including chemical coatings on any paper mixed into the bale — gets distributed through the entire batch.

Where Receipts Fit In — and Why They Don't

At first glance, a receipt looks like paper. It's flat, it's thin, it passes through the same sorting equipment as any other paper. Optical scanners at MRFs identify materials by their near-infrared light signature, and thermal paper has a coating that looks different from regular paper — but most facilities aren't specifically sorting it out. In practice, receipts mix into the general paper stream.

The problem is that thermal receipt paper is fundamentally different from regular paper. It isn't just paper with print on it. The entire surface is coated with a chemical developer — BPA or BPS — that sits as a free molecule on top of the paper rather than being bound into it. That's what makes thermal paper effective as a receipt medium, and it's also what makes it a contamination problem when recycled.

When thermal paper enters the pulping tank at a paper mill, that free BPA or BPS coating dissolves into the water and mixes through the entire pulp batch. Unlike ink, which can be removed through a de-inking process, BPA and BPS are not targeted by standard recycling treatment. They don't bind to the fiber — they wash through it. Most ends up in the process water, which becomes wastewater. Some binds to the recycled paper fiber itself and ends up in the finished product.

According to a 2015 EPA review, approximately 1.5 million pounds of BPA were reaching paper recycling sites in the United States every year from thermal paper alone. The European Commission estimated that in Europe, up to 30 percent of used thermal paper was eventually entering the recycling stream.

What Gets Contaminated

The downstream effects are documented in peer-reviewed research.

A 2011 study published in Environmental Science and Technology tested 202 paper products collected from cities across the United States — everything from receipts to napkins, toilet paper, food cartons, newspapers, and boarding passes. BPA was detected in 94% of thermal receipts (the source), but also in 81% of the other paper products tested. The products with the highest concentrations after receipts themselves were napkins, toilet paper, and food contact papers — items made predominantly from recycled paper content.

A separate analysis of recycled toilet paper published in the same period found BPA concentrations between 3.2 and 46.1 milligrams per kilogram of dry material — a significant level for a product in intimate contact with skin and mucous membranes.

The pathway is straightforward: thermal receipts enter the recycling stream, BPA washes into the pulp during processing, and the contaminated pulp becomes toilet paper, napkins, paper towels, food cartons, and other household products. Researchers at the time described thermal paper as "a major source for the contamination of recycled paper products with BPA."

To put the concentration difference in perspective: BPA in recycled consumer paper products tends to be measured in micrograms per gram, while BPA on the surface of thermal receipts is measured in milligrams per gram — roughly 1,000 times more concentrated. The recycling process dilutes the BPA significantly, but it doesn't remove it.

Wastewater

The majority of BPA released during paper recycling doesn't end up in the finished paper — it enters the process water and becomes wastewater. According to EPA data, BPA from paper recycling plants has been detected in wastewater treatment plant effluents at concentrations between 10 and 1,080 nanograms per liter. That treated effluent flows into rivers and waterways.

Studies of U.S. groundwater have found BPA at nearly 30% of sampled sites. Paper recycling plants are a documented contributor to that load, alongside other industrial sources. Wastewater treatment can remove a significant fraction of BPA through sedimentation and biological processes, but not all of it — and the concentrated sludge that remains from treatment ends up applied to agricultural land as biosolids, where BPA has been detected in soil samples and in earthworms living in treated soil.

Worker Exposure at Recycling Facilities

This is a rarely discussed angle: workers at paper mills and recycling facilities who handle large volumes of mixed paper are exposed to BPA through the same skin-contact mechanism that affects cashiers. When receipts are mixed into paper bales and then run through the pulping process, the BPA becomes aerosolized and distributed in process water. Workers handling contaminated pulp, operating the machinery, or managing wastewater at recycling plants may face elevated exposure — occupational exposure that is almost entirely unquantified in current research.

Where Receipts Actually End Up

Given that most receipts can't and shouldn't be recycled, where do they go?

The answer, for the vast majority, is landfill. Americans generate roughly 280,000 metric tons of receipt paper per year. Most of that, eventually, goes to trash.

In a modern, lined landfill with leachate collection, BPA from receipts doesn't disappear — it gradually leaches out of the paper as the material breaks down. Landfill leachate studies have detected BPA at concentrations up to 17,200 micrograms per liter in untreated leachate from Japanese landfills. In the United States, EPA data show BPA concentrations in landfill leachate up to 1.7 micrograms per liter, with detectable levels in adjacent groundwater plumes.

Modern lined landfills with leachate collection systems contain this considerably better than older or unlined sites. That leachate is collected and sent to wastewater treatment. But not all landfills are modern, and not all receipts make it to a proper lined landfill. Some are littered, some are mixed into compost, some end up in open or informal disposal.

A small number of municipalities — San Francisco and Portland among them — operate specialized collection programs that send thermal paper to cement kilns, where it's combusted at temperatures exceeding 1,400°C that fully break down BPA and BPS. But collection rates remain extremely low — well under 3% of the total volume — because awareness is minimal and drop-off points are inconvenient.

Composting is not a safe option. BPA does not readily biodegrade in compost conditions. Research has found that BPA inhibits the fungal activity that drives composting, disrupting the breakdown of organic material. Adding receipts to home or municipal compost spreads BPA into finished compost, which is then applied to gardens and agricultural land.

Burning at home is not a safe option. Incinerating thermal paper at low temperatures — in a fireplace, backyard fire, or wood stove — produces incomplete combustion that generates toxic byproducts. The EPA's emission factors suggest that burning receipts produces dioxin-like compounds at significantly higher rates than burning regular newspaper. High-temperature municipal incineration is different; it reaches temperatures that fully destroy BPA. But that is not what happens in a home fireplace.

What You Should Actually Do With Receipts

Given all of this, here is the practical guidance:

Throw thermal receipts in the regular trash. This is the current best practice recommended by the Minnesota Pollution Control Agency, the Washington Department of Ecology, and environmental researchers. A modern lined landfill is a worse outcome than no receipt at all, but it is a better outcome than recycling contamination or composting contamination. Landfill contains BPA with less active spread than either alternative.

Do not put them in the recycling bin. Even small amounts of thermal paper in a paper recycling bale can release significant BPA into the pulping process. You're not just failing to recycle one slip of paper — you're potentially contaminating an entire batch that gets turned into napkins or toilet paper.

Do not compost them. BPA doesn't biodegrade in compost conditions and will persist in finished compost used on food-growing soil.

Do not burn them at home. Low-temperature combustion creates toxic byproducts worse than the receipt itself.

If you accumulate large quantities — for expense tracking or business records — store them in a paper envelope or folder to avoid skin contact, then trash them when no longer needed. Do not shred them into loose pieces that are more likely to drift into recycling or compost.

How to Identify a Thermal Receipt

Not every receipt is thermal paper. A small number of retailers still use ink-printed paper receipts, which are recyclable and do not contain BPA. Here's how to tell the difference:

  • The scratch test: Scratch the back of the receipt firmly with your fingernail. If a dark mark appears, it's thermal paper. The heat from friction activates the BPA developer coating.
  • Sheen: Thermal paper typically has a slight sheen or slick feel on the printed side. Ink-printed receipts feel more like regular paper.
  • Fading: Thermal receipts fade over time when exposed to light or heat. Ink-printed receipts do not.

If your receipt passes the scratch test, it's thermal — put it in the trash, not the blue bin.

The Real Solution: Eliminate the Receipt

The waste problem described above has one clean answer: don't generate the receipt in the first place.

For shoppers: Ask for an email or text receipt, or decline the receipt entirely if you don't need it. Most major retailers now offer digital receipt options. A receipt you don't take is a receipt that isn't printed, handled, recycled, composted, or landfilled.

For business owners: Offering digital receipts by default — printing only on request — eliminates the disposal question, reduces paper costs, and protects employees from the daily chemical exposure that comes with handling thermal paper. One Minnesota brewery tracked its paperless transition: in the first six months without paper receipts, it avoided printing nearly 19,000 receipts, saving 43 pounds of paper waste and roughly half a pound of BPA annually. That's from a single small business.

Several major retailers have moved this direction: Starbucks, Target, and Whole Foods, among others, have restricted bisphenol paper nationally ahead of the law.

For businesses in Washington State, the 2026 bisphenol ban has already resolved this for receipts printed there: paper distributed in the state must now be phenol-free, which eliminates the BPA contamination problem at the source. Phenol-free thermal paper can be recycled without the BPA contamination concern, though it still generates paper waste. California's AB 1604, currently moving through the legislature, would extend similar requirements statewide by 2027–2028.

The longer-term arc is clear: the receipts that can't be recycled today are the ones coated with chemicals that regulators are actively phasing out. Phenol-free paper and digital receipts together represent the destination. The question is how much contaminated paper flows through the recycling system — and how much ends up in the products on your bathroom shelf — between now and then.

For more on the health effects of BPA exposure from receipts, see The Science of Bisphenols. For workers who handle receipts regularly, the 2026 Cashier Safety Guide covers practical protective steps. For business owners navigating the new Washington State requirements, see the Washington State Receipt Paper Compliance Guide.