Chlorine and Fluoride Disinfection Chlorine is used to disinfect our water, oxidize the iron and minimize the risk of microbial contamination by bacteria or viruses. The average free residual chlorine concentration in the system is maintained at 0.75 parts per million (ppm) (also stated as milligrams per liter, mg/L). Chlorine is added to drinking water systems to assure that microbial organisms such as bacteria and viruses cannot survive in the water. Some customers may notice an increase in the smell or taste of chlorine in the water when levels are initially raised. The chlorine levels are not a health concern and, in fact, are established to prevent health risk from bacteria and viruses. If customers experience a persistent and excessive odor or taste of chlorine in their drinking water, they should call the utility at 423-6310, and the report will be investigated. Fluoridation Fluoride is added to our water to improve dental health and reduce tooth decay. The average fluoride level in our water is 1.1 parts per million. The WW&LC follows the guidance of the Centers for Disease Control and The American Water Works Association with respect to water fluoridation. The Water Utility Board recently reaffirmed this policy. The Center for Disease Control provides information about dental fluorosis, which is a potential cosmetic effect of fluoridation. Monitoring Daily samples are taken at the plant for testing and other regular sampling program tests are taken weekly throughout the distribution system. Chlorine and fluoride levels are adjusted as necessary to ensure safe water is delivered to the tap.