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Microplastic Concentration and Type in a Central Illinois Urban Stream
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Researchers measured microplastic concentrations in a small urban stream in central Illinois and found levels orders of magnitude higher than those in major rivers like the Chicago or Danube, with downstream concentrations reaching 2,000 particles per cubic meter. The findings suggest small urban waterways may be underestimated but significant pathways for funneling microplastics into larger water systems.
Micro plastics have become an increasingly pervasive problem in many aquatic ecosystems. To date, most microplastic research has focused on marine systems as well as larger lakes and rivers. Studies conducted in the Chicago, Seine, and Danube Rivers respectively found the mean microplastic concentrations to b e: 1.94 microplastics per m 3 , 30 microplastics per m 3 , and 0.32 microplastics per m 3 . We investigate d the microplastic concentrations and type s in a small urban stream and its tributaries. We also considered w atershed - and reach-scale characteristics in order to determine the relationship between the characteristics and microplastic content. Grab samples were collected from Sugar Creek and respective tributaries during summer and early fall. The samples were processed using a standard method . We found that microplastic concentrations in a small urban stream can be orders of magnitude greater than those found in larger rivers. U pstream samples had an average concentration of 1, 3 00 microplastics per m 3 while the downstream average was 2,000 microplastics per m 3 . Land use is expected to influence the types and concentrations of microplastics. Our results indicate that urban landscapes may be major contributors to microplastics in freshwater environments.
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Researchers found that small urban streams can contain far higher microplastic concentrations than large rivers, with a central Illinois stream averaging 122 microplastics per cubic meter — suggesting that urban runoff and storm drainage are major, often underestimated sources of microplastic pollution in freshwater systems.
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Researchers tracked microplastic storage and transport in a small urban stream near St. Louis across seasonal conditions and a flood event, finding microplastics in 93% of samples with the highest concentration during peak flood flow. Results indicate that flood events dramatically resuspend and export sediment-stored microplastics, with synthetic fibers dominating the particle assemblage.
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Microplastic concentrations in a small New York tributary stream surged to 125 particles per cubic meter during high-flow conditions—roughly ten times the low-flow baseline—correlating with storm drain inflow and sewage leakage. This demonstrates that rainfall events dramatically amplify microplastic transport from urban infrastructure into waterways, with implications for downstream river and drinking water contamination.
A Reconnaissance of Microplastic Distribution in a Small Michigan Watershed
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A reconnaissance survey of microplastics in the Lake Macatawa watershed in Michigan found that storm sewer outfalls and wastewater treatment plant discharges were the primary local sources, with microplastics detected in beach sediments and downstream sites but at relatively low counts in upstream rural streams. This suggests that urban infrastructure—stormwater systems and wastewater effluent—is the dominant pathway delivering microplastics to freshwater systems in non-coastal US communities.
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