Contamination is defined as any impairment of the quality of the water of the State by sewage or industrial waste to a degree which creates an actual hazard to public health through poisoning or through spread of disease.The threats to public health due to transmission of pathogenic bacteria from sewage system to ground water have been reported worldwide, having septic tanks as the most frequently reported on-site source of ground water microbial contamination. It was shown that on-site source is less important than other sources of fecal matters. Use of biologically contaminated drinking water is associated with the outbreak of water related diseases such as cholera, typhoid and diarrhea.Water pollution is the presence of chemical, physical, or biological components or factors producing a condition of impairment of a given water body with respect to some beneficial use. The level of contamination necessary to render a water body impaired is highly dependent on the type of water body, its location, and the types of beneficial uses it supports. A water deemed unfit for drinking by humans may be suitable for other uses, such as habitat, irrigation, or recreation. Although certain natural events can cause water pollution, we will focus herein on the anthropogenic sources of pollution, that is, pollution arising from human activities.