Does washing synthetic clothes send microplastic into the lakes you swim in?

What's actually in it

Polyester, nylon, acrylic, and most fleece are essentially plastic woven into yarn. Washing rubs the fibers against each other and breaks small pieces off. Those bits are too small for the washer's lint filter. They go down the drain, through the wastewater plant, and into rivers and oceans.

From there, they end up in fish, drinking water, and back in your house as dust.

What the research says

A 2026 study in Sci Rep built a new lab method to count microplastic fibers from washing synthetic clothes. A typical load of fleece or polyester released hundreds of thousands of plastic fibers per wash. Older clothes shed less than brand new ones, but they all shed.

The team showed that bag-style microplastic-catching laundry filters cut shedding by most of the way.

Buy fewer synthetic clothes. Pick cotton, linen, wool, or hemp when you can. For workout gear, look for merino wool options. Use a Guppyfriend wash bag or in-line washer filter for the polyester pieces you keep, and wash on cold with full loads.