Researchers with Maryland PIRG and the Environment Maryland Research & Policy Center released a study on Tuesday showing that microplastics were present in every water sample taken throughout the Chesapeake Bay watershed. The study, which examined six samples at each of 15 sites from April 2024 through October 2026, found plastic particles smaller than 5 millimeters—smaller than a grain of rice—at all locations.
Local Findings in Maryland
Five of the sampling sites were in Maryland: the Patapsco River in Baltimore, the Choptank and Nanticoke rivers in Dorchester County, the mouth of the Susquehanna River in Harford County, and the Chesapeake Bay in Talbot County. At each of these sites, researchers detected plastic microfibers and fragments. Film and beads, however, were not found in the Maryland samples.
Types of Microplastics Detected
The most common particles were plastic microfibers, which originate from clothing and textiles, and were present at all 15 sites. Researchers also identified plastic fragments—typically from harder plastics or plastic feedstock—at 14 sites, plastic film (such as from bags and flexible packaging) at seven sites, and plastic beads used in cosmetics at four sites.
Potential Health Implications
Scientists warn that microplastics can carry heavy metals and chemical contaminants into the food chain. The National Oceanic and Atmospheric Administration has documented that these particles can be ingested by fish, birds, and humans, potentially leading to endocrine disruption, hormonal effects, and reproductive disorders. Other research has found microplastics in human organs, including kidneys, livers, lungs, blood, brains, and even unborn children.
Policy Recommendations
The report’s authors call for a range of policy actions at local, state, and federal levels. Recommendations include reducing single‑use plastics and packaging, curbing plastic pellet (“nurdle”) pollution, limiting synthetic textile waste, opposing plastic incineration, and strengthening recycling programs. They also advocate for “producer responsibility” laws that would require manufacturers to design, manage, and finance waste‑reduction and recycling for their products.
One specific suggestion is for Chesapeake Bay watershed states to adopt “bottle bills”—deposit‑refund programs that let consumers return empty plastic, metal, and glass beverage containers for a small cash incentive. While Maryland’s recent legislative session did not pass such a bill, the ten states that already have bottle bills recycle about 60% of beverage containers, compared with roughly 24% in states without the program.
What Residents Can Do
Community members who want to learn more about microplastics in their local waterways can use the guide published by the Environment Maryland Research & Policy Center to conduct their own testing. Reducing personal use of disposable plastics, choosing natural fibers over synthetics, and supporting legislation that holds producers accountable are practical steps individuals can take to protect the watershed.
Original reporting: Baltimore Fishbowl — read the source article.
