<![CDATA[Reservoir water quality is a critical factor in supporting the functions of raw water supply, irrigation, and the sustainability of aquatic ecosystems. This study analyzes the spatiotemporal dynamics of water quality in the PTPN XII Pelaihari Reservoir during 2023–2025 with Sentinel-2 satellite imagery. The main parameters observed include Total Suspended Solids (TSS), turbidity, chlorophyll-a, and Colored Dissolved Organic Matter (CDOM) as indicators of physical and biological conditions. Using a quantitative, descriptive remote sensing approach, Level-2A Sentinel-2 imagery was processed in Google Earth Engine. Analysis was conducted for both dry and rainy seasons to assess hydrological impacts. Results show significant seasonal dynamics: TSS decreased from 97 mg/L in 2023 to 65 mg/L in 2025, while turbidity rose to 0.78. Chlorophyll-a increased in the 2024 dry season, indicating higher phytoplankton productivity, but declined in 2025 due to turbidity. CDOM rose in 2025, suggesting more dissolved organic matter. Spatially, the dry season showed stable, homogeneous parameter distribution, while the rainy season was more heterogeneous due to runoff. The PTPN XII Pelaihari Reservoir has potential as a raw water source, though quality fluctuates seasonally. Sentinel-2 remote sensing enables effective, sustainable water quality monitoring and supports adaptive management.]]>
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