“Water pollution by plastics and microplastics: A review of technical solutions from source to sea,” composed of a toolkit and catalogue, has been jointly developed by the United Nations Environment Programme (UNEP) and the International Water Management Institute (IWMI). With a focus on wastewater, the publication presents a range of solutions to reduce plastic and microplastic pollution from the source to the sea. It also encourages policymakers and practitioners to set priorities and select those that are more cost-effective and suitable for their local context. Finally, it stresses the importance of having technical solutions in addition to appropriate legislation, economic instruments, education, and awareness that force real change on the ground.