The TrashBoom is a floating barrier to catch plastic waste in rivers and prevent it from entering the oceans. Locally-sourced materials enable rapid manufacturing and boost local economies while raising awareness within the society. That saves time, money, and emissions as no shipping is involved. It also increases scalability, making the solution feasible when targeting ultra-low-value plastics and non-recyclables in waterways. Minimized automation and complexity create jobs and ensure easy maintenance and repair. Open-source blueprints allow for re-building and create global impact.