Clean water is one of the most important elements to sustain good health. It is the known fact that all life would cease to exist without water. Water greatly influences the quality of our lives. Its most is one of the nature’s most important resources, yet it sometime is used very carelessly. Industry, agriculture and sewage are major polluter of water. Water makes about 80% of our body weight. Health official recommend that one should drink at least eight glasses of water each n everyday to aid digestion, regulate body temperature, restore body fluids and remove impurities from our internal system. Water is nature’s best beverages as it quenches ones thirst better than any other food or drink. Over 97%of the world reservoir of water found in oceans and is too salty for drinking, irrigation most industrial and household use in the form of glaciers and polar ice caps. Lacks and rivers which are major source of the world’s drinking water accounts for just over 0.1% of the earth’s total water. The quality of drinking water is of the vital concern for human health and life. History reveals that the pollution of drinking water caused water borne diseases, which wiped our entire pollution of the cities. According to WHO survey, 60% diseases in the Asian countries are water borne. The major pollution sources are domestic and industrial waste from urban- rural- industrial areas discharged into the natural water bodies. The studies conducted by the several agencies and the available data reveal that the drinking water in Pakistan is generally contaminated by the both highly toxic chemical and microbiological organism. WHO recorded 315 cases of water borne diseases out of 100,000 in Pakistan. A number of diseases caused by the consumption of poor water quality [6]. It has been reported in a “Community Health Study” that 30%of all the reported cases of illness and 40% of deaths in Pakistan, one way or another are related to water borne disease. This can be regarded as an alarming situation.

         Anions occur in environment through a number of ways, anthropogenic and natural origin. Some of these are toxic while other is either beneficial or non toxic in nature. The anions nitrates and sulphates are very important both from environmental as well as industrial point of view.

          Nitrates are very important due to its biological implication. The use of nitrate as fertilizer is the major source of aquatic pollution. It enters into the aquatic environment from sewage or as agriculture run off. Excessive amount of nitrates in water causes eutrophication. This process lower the DO, leads to killing fish and causes retardation in the plant growth [10].Apart from the toxic substance which damages flora and fauna and create environmental problems. Other parameters like temperature, ph, alkalinity, TDS, DO etc. are basically important in determining water quality. Nitrates in drinking water are significant public health. Concentration greater than 10mg / l as NO2- N can cause a serious medical problem in the blood stream of babies less than six months of age called Infant Cyanosis, Blue Baby Syndrome or Methaemoglobemia. Nitrates are also important for depleting DO in rivers and streams and hindering their self purification processes. Nitrates in shallow water are often due to seepage livestock manure deposits. Ground and surface water which often contained especially with nitrates and phosphorus pollution from fertilizers. The pollution of ground water by leaching of fertilizer affects man water supply sources and leads to several environmental deterioration to human health problem. Sulphates are discharged into water from mines and smelters and pulp and paper mills, textile mills and tanneries. Sulphur trioxide produce from photolytic oxidation of sulphur dioxide combines with water vapors to form dilute sulphuric acid as fall as ‘acid rain’. The presence of sulphates in drinking water can also results in noticeable taste. The lowest taste threshold concentration for sulphates is app. 250 mg/ l as sodium salt. Sulphates may also contribute to the corrosion of the distribution system. However high level sulphates in water are undesirable because it causes non carbonate hardness responsible for scale formation in the boiler at high temperature. Water Quality Index (WQI) is one of the most effective way to communicate information on the quality of water to concern citizen and the policy makers. A quality index may be defined as “a rating reflecting the composite influence of number of water quality parameters overall of water”.