Microplastics (MPs) (≤5 mm) are ubiquitous in nature and have inhabited every sphere of our planet. Studies around the globe have focused on their impact on biological organisms and the environment. The world is thinking over ways to control these particles from entering the environmental matrices and human beings. One of the primary requirements for managing this pollution is the source apportionment of the particles to identify their origin and control at the onset. In this current study, we have attempted to do the source apportionment of microplastic particles in the drinking water-supplying reservoirs of Ranchi. It was done based on their abundance, morphological, and polymeric characterization coupled with field observation of the sampling locations. Results confirmed 04 significant types of MP particles (fragments, films, fibers, and foams) in all three reservoirs ranging between 1233 and 2291 particles belonging to 08 polymer types. Finally, based on the source appropriation, we could identify the potential source items and their contribution percentage toward the MP contamination of the study area. This can help us in targeting the source activities and implement policies and action plans to curb MP pollution in any setup with similar conditions to control microplastic pollution.