Are there any adverse effects from using fluoridated water in the garden?
I do know that some indoor plants do better with water that is not fluoridated. There are conflicting opinions on the effects of fluoride on human health and the environment (including plants). According to this 2004 article entitled Water fluoridation and the environment by Howard Pollick in the International Journal of Occupational Health (reprinted by the Centers for Disease Control), the fluoride level in residential water (as opposed to industrial runoff) seldom rises above a level of concern for plants.
For an alternate viewpoint, see the Fluoride Action Network’s website.