The Cimanuk River in West Java is being considered as a source of clean drinking water. A study was conducted to assess the water and sediment quality of the river. The researchers found that the river water is polluted with substances like BOD5, COD, ammonia, sulfur, chlorine, and copper, likely from domestic and agricultural activities. The sediment was also found to be heavily polluted with cadmium and copper. This indicates that the Cimanuk River is contaminated with heavy metals, posing a risk to the environment and potentially to human health.