The objective of this meeting was to review progress to date and to discuss the delivery of project outcomes in line with its three core goals: the development of Source–Pathway–Receptor (SPR) frameworks, the generation of primary and secondary datasets, and the enhancement of stakeholder engagement to strengthen the science–policy interface. During the first year, significant progress has been achieved in the following areas. Preliminary findings from the project team, based on a comprehensive review of the current status of microplastic research in the region, confirm that there is a growing body of work investigating microplastics in different water environments. Studies highlight increasing concerns about contamination levels in wastewater (both domestic and industrial), groundwater, and drinking water. These findings point to emerging evidence of ecosystem risks and potential health impacts of microplastics across ASEAN countries.