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Thames Wipes: Citizen Scientists Uncover River's Dirty Secret
13 Oct
Summary
- Citizen scientists track wet wipe pollution in the River Thames.
- A decade of data quantifies plastic pollution on Thames foreshores.
- New data shows a significant drop in wet wipes after recent cleanups.
For nearly a decade, citizen scientists have been engaged in a dedicated project to monitor wet wipe pollution along the River Thames. Volunteers, organized by the environmental charity Thames21, meticulously search designated areas of the foreshore, collecting data on sanitary litter.
This initiative quantifies plastic pollution, with findings contributing to a comprehensive database. Hydrographic surveyors from the Port of London Authority assist by marking out survey areas based on tidal data. Volunteers use quadrats and metal sticks to uncover items like wet wipes, plastic, and other debris hidden within the silt.
One particular area near Hammersmith Bridge was identified as a hotspot due to slower water velocities on the inside of a river bend, causing material to accumulate and trap sediment. This build-up facilitated the snagging of wet wipes, exacerbating the pollution problem.
Wet wipes, often containing plastic fibers, pose a significant environmental threat when flushed. Thames Water reports that billions of wipes enter its network annually, contributing to pollution that can reach the ocean and enter the food system. The accumulation of these items has even formed a large mass known as "Wet Wipe Island."
Recent developments, including the delayed opening of the Thames Tideway Tunnel and the removal of "Wet Wipe Island," are being assessed. Initial surveys conducted by Thames21 volunteers in December 2025 indicated a substantial drop in discovered wet wipes compared to earlier counts, suggesting the effectiveness of these interventions.
Recognizing the severity of the issue, the government announced in December 2025 that selling single-use wet wipes containing plastic will be illegal by May 2027. This legislative change is a significant win for organizations like Thames21, which have actively campaigned and shared data to address plastic pollution.
Despite the positive trends, Thames21 emphasizes the importance of continued monitoring. Volunteers plan to keep counting to track ongoing changes in wet wipe accumulation, acknowledging that some may still wash ashore for a period. The project aims to document the long-term impact of cleanup efforts and infrastructure improvements on the Thames's health.
