Butuanon River shows a typical distribution of organic matter (Table 1). Organic matter is usually carried along with the silt in a downhill direction and could be increased by the effluents from the residences and from food and feed manufacturing facilities [24] that are notably abundant at midstream and downstream stations. The organic matter can actually be both beneficial and detrimental. Detrimental in such a way that it may increase BOD since more organisms would require oxygen to proceed with the process of decomposition [2]. On the other hand, it could be beneficial in such a way that organic matter can sorb trace elements and reduce contamination in the water and organisms [