Overview
- PennEnvironment released results Wednesday from a two-year citizen-science survey, and Drexel University’s lab confirmed microplastic particles at all 22 sampled sites across the Delaware River watershed.
- Researchers found multiple particle types in the samples, with rigid microfragments present at about 82% of sites and flexible plastic film at about 77%, plus widespread microfibers and some microbeads.
- Scientists link the particles to clear pathways: washing synthetic clothes sheds microfibers that pass through treatment plants, while stormwater, packaging, fishing gear and pre-production pellets add fragments and film.
- The study reports presence but does not publish concentration levels or make health-risk determinations, and no federal or state numeric limits for microplastics in water currently exist.
- Advocates are pushing for producer-responsibility laws, single-use plastic limits and tighter pellet rules, and water utilities including Philadelphia’s are evaluating advanced filtration technologies to reduce microplastic discharge.