The rapidly growing population, increasing urbanization and advancing technology contributed much to the pollution we are now exposed to. Human activities overloaded the amount of materials and changed the nature of contaminants entering into rivers, streams and lakes that have natural mechanism of self-purification. Thus the assimilating and sustaining capacity of rivers today show signs of stressful conditions. The growing environmental concern led to the investigation of the condition of the Abra River System flowing from the provinces of Benguet, Abra and Ilocos Sur and exiting to the South China Sea.