CHAPTER ONE
INTRODUCTION
           Following the theory of creation, it is clear that water is as old as man. From time immemorial, man has restorted to the use of this unique commodity for domestic and other purposes.
Most of our water supplies are from surface water which include: rivers, streams, lakes, oceans and seas and there water bodies are likely to be polluted with domestic and Industrial as well as agriculture waste, As populations increase, the problem become more serious and as such, water can endanger the health and life of human beings because when polluted by fecal materials it becomes potential carrier of pathogenic organism (Carpenter 1977).
Water, is of course, absolutely essential to life, not only human life but all life, animal and vegetable. Most of the biochemical reaction that occur in metabolism and growth of living cells involved water, and all take places in water. (Camp etal,1974).
Man uses water not only for drinking purposes but also for bathing, washing, laundering, heating, air conditioning, agriculture, stock raising and gardens, Industrial processes and cooling water power and steam power, fire protection, fishing, swimming and wild life propagation and navigation.
Natural water contain not only then natural flora but also micro – organisms from soil and possible from animals or sewage. Surface waters in streams or pools and stored waters in lakes and large ponds vary considerably in microbial content. (frazier 1978) water is broadly divided into three types viz., surface water which include: streams, rivers, lakes  sear, and oceans Kelman et al (1957)
The ground water, well borehle, many people have defined the ground water in different ways: ground water is subter water that occurs where all pores in the soil or rock counting materials are saturated (pelezer et al 1992).
The atmospheric water, which includes rain, falls. All water bodies consist of a variety of bacterial and other microorganisms like the Algaes fungi, which inhabit these natural water bodies. Some of these micro –organisms are indigenous to thus natural water while others are transient, entering the water from external environment (Pelezar and Reg, 1997).
The generality of bacteria are mostly commonly found ordinarily in fresh water some of which include:  pseudomonas, Archacbacter, and vibrio these are gram negative, the gram-positive bacterial which are found in water include: micrococcus Archacbacter and actinomycentes. Gebharal (1975)  Tap water, as one of the water sources is mostly used domestically, it is observed that tap change sometime the water tap will be clear this calls for load, in order to be sure of its portability. Bonde (1977)