INTRODUCTION1.1BACKGROUND OF THE STDUYWater is a finite resource that is very essential for the human existence, agriculture and industry thus, inadequate quantity and quality of water have serious impact on sustainable development. In developing countries such as Nigeria, people have little or no option but to accept water sources of doubtful quality, due to lack of better alternative sources or due to economic and technological constraints to treat the available water adequately before use (Calamari and Naeve, 1994; Aina and Adedipe, 1996). The scarcity of clean water and pollution of fresh water has therefore led to a situation in which one-fifth of the urban dwellers in developing countries and three-quarter of their rural dwelling population do not have access to reasonably safe water supplies (Lloyd and Helmer, 1992). Water quality characteristics of aquatic environment arise from a multitude of physical, chemical and biological interactions. A regular monitoring of water bodies with required number of parameters in relation to water quality prevents the outbreak of diseases and occurrence of hazards. According to Wotton (1992), material pollution of rivers is caused by toxic pollutants (heavy metals, phenols and insecticides, among others) that have direct adverse effect on aquatic biota and by-pollutants (human and animal waste) that indirectly affect aquatic biota, which are not toxic but due to bacterial action on them, dissolved oxygen is used up which harms aquatic biota. Assessment of water is not only for suitability for human consumption but also in relation to its agricultural, industrial, recreational, commercial uses and for its ability to sustain aquatic life. Water quality monitoring is therefore a fundamental tool in the management of freshwater resources.