Nitrate: Nitrate in water is a naturally occurring compound that contains oxygen and nitrogen. It is found in small quantities in water and soil. Nitrate has no color, taste, or odor in drinking water.High levels of nitrate can lead to the disease Mithecoglobinaria. Due to this the body of the newborn baby turns blue. Excess of nitrate in water is also a sign of biological pollution. Therefore, it is important to check the water being used (Mary H. . Ammonia: ammonia in water has adverse effects on health. Ammonia is a colourless, pungent smelling gas. Its chemical formula is NH3. It is made up of nitrogen and hydrogen. Ammonia dissolves in water to form ammonium hydroxide solution. According to the Bureau of Indian Standards, the amount of ammonia in water should not be more than 0.5 ppm. Due to high amount of ammonia in water, water becomes unfit for drinking. Excessive amount of ammonia in water has adverse effects on health. Ammonia is dangerous for health, but is not carcinogenic. If suffering from ammonia, problems like fever, cough, chest pain, nausea, vomiting, dizziness, severe stomach pain, difficulty in breathing, swelling of lips, difficulty in walking, restlessness and temporary blindness can occur.