The presence of microplastics in the environment is a serious problem, affecting water, soil, and air ecosystems. This study aimed to identify the presence and distribution of microplastics in monitoring well water around the Putri Cempo landfill, Surakarta, Indonesia. Groundwater is a vital source of domestic water in the region but is vulnerable to contamination from landfill leachate. Water samples from seven monitoring wells were treated using wet peroxide oxidation, then analyzed under a light microscope and confirmed with Fourier Transform Infrared Spectroscopy (FTIR). The abundance of microplastics ranged from 320 to 1960 particles/L, with fragments as the dominant type, black as the most frequent color, and polystyrene (PS), polycarbonate (PC), and polypropylene (PP) as the main polymers. These results indicate that landfill-derived plastic waste contributes significantly to groundwater pollution. The findings underline the urgency of routine monitoring and integrated waste management to minimize microplastic exposure through community water supplies.