Water pollution poses the most serious threat to environmental pollution due to its direct impact on biodiversity, human health, and ecological balance. This study investigates the potential of utilizing two pollutants, water hyacinth (WH) and Polyethylene Terephthalate (PET), in composite materials to combat water pollution caused by these pollutants. Composite samples were created with varying ratios of water hyacinth to PET (1:1, 1:2, 2:1) and three different fiber orientations. The mechanical and physical properties of these samples were analyzed to assess the impact of various compositions and orientations. The research identifies an optimal composite combination and better orientation of fibers. Additionally, it proposes a specific application utilizing water hyacinth and PET composites to address water pollution challenges. Maximum tensile, flexural and impact strength were obtained as 54.31 MPa, 77.12 MPa, and 5.4 kJ/m2 for unidirectional fiber orientation with a ratio of 2:1.