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Abundance of Microplastics in Freshwater Streams of Rural Areas
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This study surveyed microplastic concentrations in freshwater streams in rural areas, finding plastic particles including microbeads from personal care products and synthetic fibers in most samples. The results indicate that microplastic contamination extends well beyond urban settings into rural waterways.
A relatively new type of pollutant called microplastics have emerged in freshwater streams that can cause damage to wildlife and the overall health of aquatic ecosystems. Microplastics are tiny pieces of plastic around 5mm or smaller that are showing up all over the world in aquatic and marine environments. These microplastics are being produced by a number of different sources; one being microbeads, which are miniscule pieces of polyethylene, used in cosmetics and exfoliating beauty products. While other sources come from larger pieces of plastic debris that have further broken down into smaller pieces over time, these small particles of plastic are passing through the filtration systems of wastewater treatment plants with ease and into the surrounding streams. With wastewater treatment plants being the gateway for microplastics into aquatic ecosystems, we will be testing for a significant difference in the concentrations of microplastics upstream from the plants versus downstream. Samples will be taken every week in the stream surrounding the Village of Morton's wastewater treatment plant, both upstream of the effluent and downstream of the effluent. The samples will then be taken to the laboratory and processed using standardized methods to dry out and digest the organic material from the original samples, leaving behind the microplastics to be sorted and counted. We predict that, because the filtration systems of most wastewater treatment plants are not well suited to stop microplastics, there will be a higher concentration downstream of the effluent than upstream of the effluent. We also predict that the microplastics found will contain more microfibers rather than microbeads due to the Microbead-Free Waters Act of 2015. Microplastics have been thought to be substantially more concentrated in highly populated areas like big cities, but evidence of microplastics now being present in rural areas suggests that these little particles are becoming a much larger problem.
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Microplastic Prevalence in 4 Oregon Rivers Along a Rural to Urban Gradient Applying a Cost-Effective Validation Technique
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Microplastics were found in all samples from four Oregon rivers spanning rural to urban settings, and microfiber abundance was correlated with human population within 5 km of sampling sites. The study demonstrates that even remote rural rivers carry measurable plastic pollution, underscoring the pervasive reach of microplastic contamination in freshwater systems.
Microplastic pollution differences in freshwater river according to stream order: Insights from spatial distribution, annual load, and ecological assessment
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Researchers compared microplastic pollution levels in a freshwater river across different land-use zones, finding higher concentrations near urban and agricultural areas than in forested regions. Fiber-type microplastics were predominant across all sampling locations.
Microplastic pollution in streams spanning an urbanisation gradient
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Researchers sampled microplastics in small streams across an urbanization gradient and found contamination at all sites, with concentrations comparable to those in larger rivers and lakes. Fragments and small particles between 63 and 500 micrometers were the most common forms detected. Surprisingly, catchment-scale factors like population density and stormwater overflows did not predict microplastic levels well, suggesting that local-scale sources may be more important for pollution in small streams.
Distribution and risk assessment of microplastic pollution in a rural river system near a wastewater treatment plant, hydro-dam, and river confluence
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This study measured microplastic pollution in a rural river in New York State and found elevated concentrations near a wastewater treatment plant, a hydroelectric dam, and a river junction. Even in this mostly forested and agricultural area, all sites were polluted with microplastics at concerning levels. The findings demonstrate that microplastic contamination is not just an urban problem and can affect rural waterways that communities depend on.
Assessment of Microplastic Pollution in Urban and Rural Freshwater Systems: Sources, Distribution, Ecological Risks, Monitoring Approaches, and Management Strategies
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This review summarizes existing research comparing microplastic pollution in city and rural rivers, streams and lakes. It found that cities mainly contribute microplastics through wastewater and industrial waste, while rural areas add pollution via farm plastics and runoff, with effects on water life and inconsistent testing methods across studies.
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