Laundry is a top source of microplastic pollution – here’s how to clean your clothes more sustainably

Washing machines can produce millions of tiny plastic particles that are polluting land and water.

By

/

/

4 minute read

Laundry washwater is a major source of microplastic fibers that can end up in water and soil. Venca-Stastny/iStock via Getty Images

Microplastics are turning up everywhere, from remote mountain tops to deep ocean trenches. They also are in many animals, including humans.

The most common microplastics in the environment are microfibers – plastic fragments shaped like tiny threads or filaments. Microfibers come from many sources, including cigarette butts, fishing nets and ropes, but the biggest source is synthetic fabrics, which constantly shed them.

Textiles shed microfibers while they are manufactured, worn and disposed of, but especially when they are washed. A single wash load can release several million microfibers. Many factors affect how many fibers are released, including fabric type, mechanical action, detergents, temperature and the duration of the wash cycle.

My research focuses on coastal ecology and water pollution, including work in New York and New Jersey marshes and estuaries that are heavily affected by human activities. Here are some things to know about reducing microplastic pollution from your washing machine.

Red microfibers collected from coastal waters in a towed sample off Newport, Ore. NOAA Fisheries

From fabric to water and soil

Once garments release microfibers in washing machines, the fibers enter the wastewater stream, which generally goes to a wastewater treatment plant. Advanced treatment plants can remove up to 99% of microfibers from water. But since a single laundry load can produce millions of fibers, treated water discharged from the plant still contains a huge number of them.

Microfibers that are removed during treatment end up in sewage sludge – a mix of solid materials that is processed to remove pathogens. In many cases, treated sewage sludge is applied to soil as a fertilizer. This allows microfibers to enter air and soil, and to be transferred to soil organisms and up the terrestrial food web or taken up by crops.

Microplastics that wash into rivers, lakes and bays can have many harmful effects. They may be consumed by fish and other aquatic animals, affecting their biochemistry, physiology, reproduction, development or behavior. These microplastics contain chemical additives, including substances like phthalates and bisphenol A that can leach out and may have health effects in humans and animals, including effects on the endocrine system.

Textile microfibers also contain additional chemicals that have been shown to be toxic, such as fabric dyes, anti-wrinkle agents and flame retardants. In addition, contaminants that are present in the water, such as metals and pesticides, can stick to microplastic particles, turning them into a veritable cocktail of contaminants that may be transferred into animals that eat them.

Washing more sustainably

Not all fabrics shed microfibers at the same rate. A loosely woven fabric that feels fluffy or fuzzy, such as fleece, sheds more than a tightly woven one. While garments made of natural fibers, such as cotton and wool, would appear to be a solution, unfortunately they also shed microfibers that can pick up pollutants in the environment.

Some textile scientists and manufacturers are developing fabrics that shed less than existing ones, thanks to features such as longer fibers and coatings to reduce shedding. Meanwhile, here are some ways to reduce microfiber shedding from your laundry:

  • Do laundry less often. Washing full loads instead of partial loads reduces release of microfibers because garments are exposed to less friction during the wash cycle.
  • Use cold water, which releases fewer microfibers than hot water.
  • Use less detergent, which increases microfiber release.
  • Use a front-loading washing machine, whose tumbling action produces less microfiber release.
  • Dry laundry on a clothesline. Running clothes in dryers releases additional microfibers into the air from the dryer vent.

Several types of products collect microfibers in the washer before they are released with wastewater. Some are laundry bags made of woven monofilament, a single-polyamide filament that does not disintegrate into fibers. Laundry is washed while enclosed in the bag, which traps microfibers that the garments release. A study of one such product, Guppyfriend, found that it collected about one-third of released microfibers.

Another device, the Cora Ball, is a plastic ball with spines topped with soft plastic discs that capture microfibers. It reduces microfibers by about 25% to 30%, but may not be suitable for loose knits because it can snag on threads and damage clothing.

External filters, like this Samsung version, can be attached to washing machines to remove most microfibers from wastewater. Samsung U.S., CC BY-ND

Filter your washwater

Several brands of external filters are available that can be retrofitted onto existing washing machines. External filters can remove up to 90% of microfibers from rinse water. Their average cost is about US$150. Owners need to clean the filters periodically and dispose of the collected microfibers with other solid waste, not down the drain, which would put them back into the wastewater stream.

In a 2021 study, researchers installed washing machine filters in 97 homes in a town in Ontario, Canada, which represented about 10% of the households in the community. They found that this significantly reduced microfibers in treated water from the local treatment plant.

Some companies are now manufacturing washers with built-in microfiber filters. France has enacted a requirement for all new washing machines to be equipped with filters by 2025, and Australia has announced that filters will be required in commercial and residential washers by 2030.

In the U.S., a similar requirement was passed by the California legislature in 2023, but Gov. Gavin Newsom vetoed the bill, saying he was concerned about the cost to consumers. An economic study commissioned by Ocean Conservancy found that filters would increase the price of washing machines by only $14 to $20 per machine. Several states are considering regulations that would require filters in washers.

In my view, requiring manufacturers to add filters that can trap microfibers to washing machines is a reasonable and affordable step that could rapidly reduce the enormous quantities of microfibers in wastewater. The eventual solution will be reengineered textiles, which won’t shed, but it will take some time to develop them and move them into clothing supply chains. In the meantime, filters are the most effective way to tackle the problem.


Comments

St. Croix 360 offers commenting to support productive discussion. We don’t allow name-calling, personal attacks, or misinformation. This discussion may be heavily moderated and we reserve the right to block nonconstructive comments. Please: Be kind, give others the benefit of the doubt, read the article closely, check your assumptions, and stay curious. Thank you!

“Opinion is really the lowest form of human knowledge. It requires no accountability, no understanding. The highest form of knowledge is empathy, for it requires us to suspend our egos and live in another’s world.” – Bill Bullard

5 responses to “Laundry is a top source of microplastic pollution – here’s how to clean your clothes more sustainably”

  1. Bonnie Avatar
    Bonnie

    How bout we just go back to like they did it in the old days….. make natural materials.
    We wouldn’t have this problem if we stick to the basics. It’s a no brainer.

  2. James Avatar
    James

    We should go to back to all natural cotton and wool fabrics that are biodegradable and glass bottles which can be recycled endlessly and do eventually break down into their constituent sand.

  3. Samuel Bess Avatar
    Samuel Bess

    Do it!..Take personal steps to buy cotton, or hemp clothing or wool. Also buy dairy only in glass containers…or purchase vegetables raw, use no store-provided plastic baggies or coated meat counter wrappings….stop buying bottled water and other plastic containers….filter all tap water used for human consumption…for pfoas, And microplastics…many store filter systems don’t filter these….

    1. James Avatar
      James

      I do my best to not use paper towels (that use tons of water to produce) I use cotton cloths, I drink from a thermal steel cup (not a Styrofoam or plastic cup) I refill with ice and water, I try to use wood or steel utensils not plastic. I would say my clothes are 95% cotton or wool very little synthetics. I have lived this way cleanly for most of my life. My leaves from fall and grass clippings are returned to my yard as mulch instead of going to landfills. The only way to stop using plastics is go back to containers of steel, aluminum, glass and some paper. Unfortunately some plastics will never go away so good recycling program, like aluminum, would keep plastics out of the environment. I do my part to reduce plastics, micro or otherwise unfortunately this type of mindset is not glamorous and popular with mainstream society.

  4. Mark Hove Avatar
    Mark Hove

    Thanks for the info!

REPUBLISHING TERMS

You may republish this article online or in print under our Creative Commons license. You may not edit or shorten the text, you must attribute the article to St. Croix 360 and you must include the author’s name in your republication.

If you have any questions, please email greg@stcroix360.com

License

Creative Commons License Attribution-ShareAlikeCreative Commons Attribution-ShareAlike
Laundry is a top source of microplastic pollution – here’s how to clean your clothes more sustainably