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The Missouri Confluence Waterkeeper, a nonprofit advocating for clean water, tested a total of 31 samples of water [for microplastics], mainly from north St. Louis County and north St. Louis. Researchers did the majority of testing between September and November 2022. They worked with the Illinois Sustainable Technology Center at the University of Illinois, Champaign-Urbana. Funding for the project came from the Missouri Foundation for Health.