Microplastic, defined as plastic particles ranging from 1µm to 5 mm, have become an emerging concern in drinking water supply systems due to their persistence, resistance to degradation and potential implications for human health. Previous studies have shown that conventional water treatment processes may be limited in their ability to remove micro- to submicron- sized particles, particularly in tropical regions with high pollution loads. This study aimed to identify and characterize microplastics at difference stages of the drinking water treatment plant in Palembang, South Sumatera. Samples were collected from Ogan River at four treatment stages at Water Treatment Plant A (WTP A): intake, coagulation-flocculation, sedimentation and reservoir. The samples were filtered using Whatman GF/F filter paper, subjected to oxidation with 30% H₂O₂, and analyzed using an optical microscope for morphological observation and fourier transform infrared (FTIR) spectroscopy for polymer identification. Microplastics were detected at all stages, with highest concentrations observed in raw water, and an overall removal efficiency of 69.4%. Fragment were dominant form (> 93%) followed by fiber, film, and pellets. FTIR analysis indicated that polyvinyl chloride (PVC) was more prevalent in raw water; polyethylene terephthalate (PET) and polystyrene (PS) were observed during the flocculation stage, while PET, polypropylene (PP) and polyethylene (PE) were detected in treated water. These finding suggest that conventional treatment processes are more effective in reducing denser polymers such as PVC, whereas lighter polymers such as PET and PP may persist through treatment. This highlights the potential need for complementary advanced treatment technologies, such as nanofiltration or activated carbon adsorption, to further improve drinking water quality.