How many microplastics are released in a single wash load?

A single load of synthetic laundry can release between 700,000 and 18 million microfibers into wastewater, depending on the fabric type, water temperature, and agitation level. Polyester fleece is among the worst offenders, shedding millions of fibers per cycle. These fibers are so small that most wastewater treatment plants cannot filter them out, meaning they flow directly into rivers, lakes, and oceans.

Research shows that approximately 35% of all marine microplastics originate from textile washing. Once in the water, microfibers enter the food chain through fish and shellfish, eventually making their way back to our plates and drinking water. Studies have detected microplastic particles in human blood, lung tissue, and placental samples.

Reducing your synthetic wardrobe is the most effective way to cut microfiber pollution at the source. Natural fibers like organic cotton, Tencel, and merino wool biodegrade in water and do not contribute to persistent microplastic contamination. ONDU curates brands that prioritize these materials so you can make a real difference with every load of laundry.