Are Paper Towels Toxic? A Look at the Chemicals

Paper towels are not acutely toxic in any ordinary sense, but they are not chemically inert either. Research over the past two decades has identified trace amounts of dioxins, processing chemicals, bisphenol compounds, and even bacteria in unused paper towels, with the specific cocktail depending on whether the product is made from virgin wood pulp or recycled fibers. The amounts are small enough that a single use will not harm you, but the picture gets more interesting when you look at the chemistry and consider cumulative exposure.

The Dioxin Concern Is Mostly Behind Us

For years, the biggest chemical worry about paper towels was dioxin, specifically a compound called 2,3,7,8-TCDD, one of the most studied toxic substances on the planet. Dioxins form when wood pulp is bleached with elemental chlorine gas, a process that was standard in the pulp and paper industry through the 1980s. A risk assessment by the U.S. Consumer Product Safety Commission estimated the individual lifetime excess cancer risk from dioxin in paper towels used for household cleaning at about two in a billion, and the combined risk from all bleached-pulp consumer products (diapers, tissues, napkins, and paper towels together) at roughly five in a billion.¹ Those are extraordinarily low numbers, and they were calculated when the old chlorine bleaching process was still widespread.

The industry has since shifted almost entirely to chlorine dioxide bleaching, sometimes called elemental chlorine-free (ECF) processing. Research confirms that this switch effectively eliminates the formation of the two most dangerous dioxin variants (2,3,7,8-TCDD and 2,3,7,8-TCDF) during pulp bleaching, as long as contamination of the chlorine dioxide supply with elemental chlorine stays below about 0.3 percent.² Comparative testing at a reed-pulp mill found that dioxin-like toxic equivalents dropped roughly 1.3 to 15 times when chlorine dioxide replaced elemental chlorine.³ Some manufacturers now go further, using totally chlorine-free (TCF) bleaching with hydrogen peroxide or ozone. For consumers buying paper towels in North America or Europe today, dioxin is a legacy concern rather than a present one.

Wet-Strength Resins and MCPD

A more current chemical question involves the resins that make paper towels hold together when wet. Unlike writing paper, which falls apart in water, paper towels need to survive soaking, scrubbing, and wringing. Manufacturers achieve this by adding wet-strength resins during production. Some of these resins contain or generate compounds called monochloropropanediols, typically referred to as 3-MCPD and its cousin 2-MCPD. The International Agency for Research on Cancer classifies 3-MCPD as a possible carcinogen, based mostly on animal studies showing kidney and reproductive effects at high doses.

Testing of paper towels from Canadian and German markets found 3-MCPD in every sample, at levels ranging from 42 to about 2,470 nanograms per gram of paper. The related compound 2-MCPD showed up in most samples too, at roughly 0.5 to 10 percent of the 3-MCPD concentration.⁴ The practical question is whether those chemicals actually migrate into your food when you, say, wrap a sandwich in a paper towel or use one to drain fried food. The answer depends on moisture and fat content: greasy or wet foods draw more chemicals out of the paper. The levels detected in the paper itself are low, but if you routinely use paper towels as makeshift food wrappers, there is some transfer happening.

BPA and BPS in Recycled Paper Towels

Bisphenol A (BPA) is the endocrine-disrupting compound that made headlines in plastic baby bottles and food can linings. What many people do not realize is that BPA also turns up in paper products, especially those made from recycled fibers. The contamination traces back to thermal receipt paper, the glossy paper used for store receipts, which can contain BPA at milligram-per-gram levels. When thermal receipts enter the paper recycling stream, their BPA hitchhikes into the recycled pulp and winds up in downstream products.

A study testing 15 types of paper products from several U.S. cities found BPA in the majority of them. Thermal receipts had the highest concentrations by far, but napkins, paper towels, and toilet paper made from recycled fibers contained BPA at microgram-per-gram levels, several orders of magnitude lower than receipts but still measurably present.⁵ As manufacturers have responded to consumer concern by replacing BPA with alternatives like bisphenol S (BPS), researchers have gone looking for those substitutes in paper too. BPS was detected in over half of 105 paper product samples tested, at concentrations up to about 8.4 micrograms per gram.⁶ Whether BPS is meaningfully safer than BPA is itself an open question; early evidence suggests it has similar endocrine activity at similar concentrations.

Testing of paper products from the Chinese market reinforced this pattern. Bisphenol alternatives were detected in more than 80 percent of nonthermal paper samples, suggesting that contamination in thermal paper spreads broadly through recycling.⁷ The concentrations in paper towels are far lower than in receipt paper, and skin absorption from a dry paper surface is slower than from a wet or greasy one. Still, for people who are trying to minimize bisphenol exposure, paper towels made from virgin pulp carry essentially none of this contamination, while recycled-fiber products carry some.

How Skin Contact Affects Chemical Transfer

Knowing that a chemical exists in a paper product is different from knowing how much actually gets into your body. Migration depends heavily on the conditions of contact. Research on thermal receipt paper showed that holding a receipt with dry hands transferred dramatically less BPA to the skin than holding one with wet or greasy hands.⁸ While that study focused on receipts rather than paper towels, the principle applies to any chemical transfer through skin contact with paper: moisture and oils on the skin act as solvents, pulling more chemicals out of the paper and speeding absorption.

This matters for how you use paper towels in practice. Drying your hands with a paper towel is brief, dry-to-dry contact. Wrapping warm, greasy food in a paper towel creates the conditions most favorable for chemical migration. Using a wet paper towel to wipe a cutting board falls somewhere in between. The dose from any single use is tiny, but people who routinely use paper towels as food-contact surfaces are getting more cumulative exposure than people who use them only for hand drying or surface cleaning.

Heavy Metals in Recycled Products

Recycled paper can also carry trace heavy metals picked up from inks, adhesives, and other materials in the recycling stream. An evaluation of recycled papers used for food packaging found detectable levels of copper, zinc, manganese, chromium, cadmium, and lead. Most concentrations fell below safety limits set by the U.S. EPA and the European Commission, but lead and cadmium exceeded the stricter European Union standard in the recycled samples tested.⁹ Nickel was not detected at all. The concentrations varied among different recycled paper types, with copper, chromium, lead, and cadmium levels differing significantly between products.¹⁰

The study examined food packaging rather than paper towels specifically, but recycled paper towels come from the same fiber streams and face the same contamination risks. The reassuring finding is that most metals stayed within regulatory limits, and the amounts that actually migrate into food during short contact periods are a fraction of what the paper contains. That said, the EU standard is more conservative than the EPA’s, and even the EU limit was exceeded for lead and cadmium in some samples. If you are cautious about heavy metal exposure, virgin-fiber paper towels sidestep this concern entirely.

Bacteria Hiding in Unused Paper Towels

Chemicals are not the only passengers. A pilot study testing several brands of unused paper towels straight from the package found bacterial counts ranging from about a hundred to a hundred thousand colony-forming units per gram. The overwhelming majority of the bacteria belonged to the Bacillus genus, which accounted for 83 percent of isolates, followed by Paenibacillus at about 16 percent. Paper towels made from recycled fibers harbored between 100 and 1,000 times more bacteria than those made from virgin wood pulp.¹¹

The researchers also demonstrated that these bacteria could transfer from paper towels to hands during drying. The species involved, mostly Bacillus, are common environmental organisms and not dangerous to healthy people. But the finding raised questions for healthcare settings, where immunocompromised patients might be vulnerable. A follow-up investigation into hand-drying methods noted that the bacterial load on commercial paper towels is a real variable in hygiene studies and that some researchers sterilize towels before testing to control for it.¹² For everyday home use, the bacterial load in paper towels is not a health concern. In hospitals and food-processing facilities, it is one more factor in the hygiene equation.

Microfiber and Dust Shedding

Anyone who has torn a cheap paper towel apart has noticed the lint and dust it leaves behind. That dust consists partly of cellulose microfibers, which are increasingly studied as a subset of the broader microfiber pollution problem. Testing of nonwoven materials, including wipes, found that about 4 milligrams of microfibers per gram of material could be released into air during physical agitation, and between 1 and 65 milligrams per gram released into water depending on the material.¹³

Cellulose fibers are biodegradable, which makes them less persistent than synthetic microfibers from polyester clothing or plastic wipes. But the shedding is not zero, and any chemicals present in the paper, such as the MCPD from wet-strength resins or residual bisphenols in recycled products, ride along on those fibers. If you are using paper towels in a dusty, vigorous way (think wiping down a lot of surfaces in a poorly ventilated room), you are inhaling some of that dust. The health significance of inhaling cellulose fibers at household levels is not well established, but occupational health research on paper mill workers has long treated paper dust as an irritant worth controlling.

Virgin Versus Recycled Paper Towels

A pattern emerges from the research: recycled paper towels carry a broader and heavier chemical and biological load than virgin-fiber products. They contain more bacteria, more bisphenols, and potentially more heavy metals. Toxicity testing comparing virgin and recycled fiber-based papers for food contact confirmed this directly. Ethanol extracts of recycled-fiber paper were more cytotoxic (more damaging to cells in a lab dish) than those from virgin-fiber paper, and the recycled papers released a greater number and higher concentration of extractable chemicals. The one reassuring finding was that none of the extracts, whether from virgin or recycled paper, showed mutagenic activity, meaning they did not cause genetic mutations in the standard screening test.¹⁴

This does not mean recycled paper towels are dangerous. It means they are measurably different from virgin-fiber products in ways that are relevant to someone who cares about trace chemical exposure. The tradeoff is environmental: virgin-fiber products require cutting trees and typically involve more energy-intensive processing, while recycled products keep waste paper out of landfills. Some manufacturers now use bamboo or other fast-growing fibers with elemental chlorine-free bleaching as a compromise, aiming for both lower environmental impact and a cleaner chemical profile.¹⁵

Practical Ways to Reduce Exposure

If you are concerned about chemical exposure from paper towels, the single most effective step is to stop using them as food-contact surfaces. Do not wrap hot or greasy food in paper towels, and avoid lining bread baskets or serving dishes with them if the food is moist. Use a clean cloth towel, parchment paper, or a plate instead. This eliminates the main route for MCPD and bisphenol migration into food.

For hand drying and surface cleaning, the exposure from paper towels is genuinely small. A few additional choices can reduce it further:

Check the fiber source: Products labeled “made from virgin pulp” or “100% virgin fiber” will have lower levels of BPA, BPS, heavy metals, and bacteria than recycled-fiber products.
Look for bleaching claims: “TCF” (totally chlorine-free) or “ECF” (elemental chlorine-free) on the packaging means dioxin formation during bleaching was minimized or eliminated.
Avoid prolonged wet contact: The wetter and warmer the contact between food and paper, the more chemicals migrate. Brief dry contact transfers very little.
Ventilate when cleaning extensively: If you are going through a roll of paper towels cleaning a kitchen or bathroom, the cumulative dust and fiber shedding is higher than for a single sheet. Opening a window helps.

When Regulators Step In and When They Do Not

Paper towels occupy an odd regulatory niche. They are not formally classified as food-contact materials in most jurisdictions unless the manufacturer markets them for food use. The FDA regulates materials intended for food contact under specific conditions, but a general-purpose paper towel sold for hand drying and cleaning does not automatically fall under those rules, even though consumers routinely use them to drain bacon or wrap a burrito. In Europe, food-contact paper must meet migration limits for certain substances, but enforcement focuses on products explicitly sold for food contact.

This gap means that the chemical load in a typical paper towel is not routinely tested or regulated for food safety. The studies cited above were conducted by independent researchers, not by regulators enforcing compliance. Some brands voluntarily meet food-contact standards and say so on the label, which is worth looking for if you use paper towels near food. But the default assumption should be that an ordinary paper towel was designed for cleaning and hand drying, not for cradling your lunch. Treating it accordingly is the simplest way to keep trace chemical exposure where it belongs: at trace levels.