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How is water treated? First, it goes to coagulation, has turners that resemble a fan, where chemicals are added to make the filtration easy for the other steps. Then it is sent to flocculation where the water mixes. The chemicals in the water make particles stick together when mixed; the stuck together particles are called floc. After flocculation it goes to sedimentation where the velocity of the water decreases letting floating particles including floc sink to the bottom. This process forms what is called sludge at the bottom which is removed. Next is filtration, where it is sent through 36 inches of graded sand, this removes more unwanted particles, taste, and odor. One of the final steps is disinfection which is where pathogens are sterilized. Many chemicals are added to the water such as chlorine, ammonia, and ozone to remove parasites and maladies from the water. (Oregon Government Department of Human Services) Even though all these precautions are taken to make sure water is safe there is still a risk of getting sick if your immune system is weak. (consumerfed)