Microplastics in Local Waterway Systems
Faculty Mentor Information
Dr. Rachel Headley, College of Idaho
Presentation Date
7-15-2026
Abstract
Microplastics, defined as plastic particles smaller than 5 mm, are an emerging environmental pollutant that persist in freshwater ecosystems and can be transported through river systems. This study examined the spatial distribution of microplastic concentrations across multiple Idaho river locations while evaluating associated water quality parameters. Water samples (100–200 mL) were collected from multiple river sites using a standardized dip-sampling method. Samples were vacuum filtered through cellulose filters, dried, and examined under a light microscope at 40× magnification. Suspected microplastics were counted and categorized as fibers, films, fragments, beads, or other particles. Field blanks were used to assess potential contamination and improve quality control during sample processing. Microplastics were detected at all sampling locations, although concentrations varied among sites with Indian Creek generally having the highest concentrations. To support long-term monitoring and expand geographic sampling, standardized community sampling kits and instructional materials were developed for citizen scientists to collect water samples and environmental data using consistent protocols. These findings demonstrate the widespread presence of microplastics in Idaho river systems and highlight the value of standardized, community-engaged monitoring for future freshwater microplastic research.
Microplastics in Local Waterway Systems
Microplastics, defined as plastic particles smaller than 5 mm, are an emerging environmental pollutant that persist in freshwater ecosystems and can be transported through river systems. This study examined the spatial distribution of microplastic concentrations across multiple Idaho river locations while evaluating associated water quality parameters. Water samples (100–200 mL) were collected from multiple river sites using a standardized dip-sampling method. Samples were vacuum filtered through cellulose filters, dried, and examined under a light microscope at 40× magnification. Suspected microplastics were counted and categorized as fibers, films, fragments, beads, or other particles. Field blanks were used to assess potential contamination and improve quality control during sample processing. Microplastics were detected at all sampling locations, although concentrations varied among sites with Indian Creek generally having the highest concentrations. To support long-term monitoring and expand geographic sampling, standardized community sampling kits and instructional materials were developed for citizen scientists to collect water samples and environmental data using consistent protocols. These findings demonstrate the widespread presence of microplastics in Idaho river systems and highlight the value of standardized, community-engaged monitoring for future freshwater microplastic research.