On Feb. 18, 2016, WI WSC scientist Austin Baldwin presented preliminary findings on microplastics in Great Lakes tributaries to the White House Office of Science and Technology Policy's Subcommittee on Water Availability and Quality. This study sampled the quantity and particle types of floating microplastics in 29 tributaries in 6 states.
USGS.gov
https://www.usgs.gov/center-news/presenting-preliminary-microplastics-results-white-house