Surely adding a polluting poison to the public water supply is important?
As a previous correspondent noted it is illegal to dump fluoride into rivers, the sea or landfill sites. In this context it is interesting to note a statement made in 1983 by Rebecca Hanmer, Deputy Administrator for Water of the US Environmental Protection Agency that, "in regard to the use of fluosilicic acid as a source of fluoride for fluoridation, this agency regards such use as an ideal solution to a long-standing problem. By recovering byproduct fluosilicic acid from fertilizer manufacturing, water and air pollution are minimized, and water utilities have a low-cost source of fluoride available to them."
It would seem therefore that pro-fluoridating authorities have been happy so solve a pollution problem by diluting the offending industrial waste in public water supplies for decades.