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Indonesia Power PLTU Jabar 2 Palabuhanratu's activities have an impact on the quality of the surrounding river water and ocean. Monitoring the quality of the water thereafter became an important factor. Using remote sensing technologies, the spatial and temporal salinity of water can be determined. This study aims to (1) determine the river water quality in Cimandiri Downstream River and the seawater quality in Batu Bintang Beach; (2) determine the river water and seawater quality for clean water in Cimandiri Downstream River and Batu Bintang Beach based on Health Ministerial Regulation No. 32/2017; and (3) determine the spatial-temporal distribution of salinity in the river water quality in Cimandiri Downstream River and seawater quality in Batu Bintang Beach. River water and ocean quality, including physical parameters (total dissolved solids, electrical conductivity, and temperature) and chemical parameters (pH and salinity), groundwater suitability for clean water, and the spatial-temporal distribution of salinity, are the variables of study. (1) River water and saltwater quality in the Cimandiri Downstream River and Batu Bintang Beach are suitable with regard to physical parameters (total dissolved solids, electrical conductivity, and temperature) and chemical parameters (pH and salinity). (2) According to Health Ministerial Regulation No. 32/2017, the river and seawater quality in the Cimandiri Downstream River and Batu Bintang Beach for clean water is adequate in terms of physical characteristics (total dissolved solids, electrical conductivity, and temperature) and chemical parameters (pH and salinity). The average salinity from August through November of 2021 was 20.76 g/m3, 16.25 g/m3, 15.76 g/m3, and 18.51 g/m3. The average salinity between April and August of 2022 was -2,74 g/m3, 3,51 g/m3, 0.51 g/m3, 4,25 g/m3, and -2,98 g/m3.