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Microplastics from Metro Vancouver’s laundered clothes are ending up in water treatment plants and filtering into the ocean, says a study published in the science journal Marine Pollution Bulletin.

The study by the ocean-protection group Ocean Wise and the Metro Vancouver regional district found that while up to 99 per cent of the particles were filtered out, a significant amount still made it into the ocean.

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The study, believed to be the first of its kind in Canada, found Vancouver-area treatment plants remove about 1.8 trillion plastic particles in waste water each year, but 30 billion particles are still released into the ocean.

Peter Ross, the study’s principal investigator and vice-president of research at Ocean Wise, said many of the microplastics are in the form of fibres from polyester and rayon clothing.

“Both those numbers are high and really point to the need for us to track these particles back to their sources more coherently,” he said in an interview on Thursday.