The precipitate or floc particles grow in size and settle to the bottom of large pools called clarification basins. Precise amounts of chlorine and ammonia are added to prevent bacterial growth as water passes through our distribution system. Finally, a small quantity of fluoride is added to promote strong teeth and bones. The Bloomington water treatment plant's clarification basins. As water travels over or through the ground, it dissolves naturally-occurring minerals and, sometimes, radioactive material.
Water also picks up substances from animal or human activity.
Drinking water, including bottled water, may reasonably be expected to contain small amounts of contaminants. The presence of contaminants does not necessarily indicate the water poses a health risk. Inorganic contaminants Salts and metals which can be naturally-occurring or result from urban storm runoff, industrial or domestic wastewater discharges, oil and gas production, mining or farming. Include synthetic and volatile organic chemicals which are by-products of industrial processes and petroleum production. Can also come from gas stations, urban storm water runoff and septic systems.