Increase of fluoride in river - USA

Only fluoride levels increased. In 1963, fluoride averaged .167 ppm. In 2003 it averaged .222 ppm. Water fluoridation to prevent tooth decay started becoming popular after 1950. By 2000, 54.2 percent of Pennsylvanians were receiving fluoridated water, according to the Centers for Disease Control and Prevention.

Water fluoridation could responsible for the increase, but it also could have come from fertilizers, chemical manufacturing and even natural sources said Joseph Dinkel, assistant executive director and plant manager for the West View Water Authority. However, the levels are low and shouldn't be harming the environment, he said.
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