In 1983, the EPA admitted that its primary water fluoridation chemical is a water pollutant: "In regard to the use of fluosilicic acid as a source of fluoride for fluoridation, this Agency regards such use as an ideal environmental solution to a long-standing problem. By recovering by-product fluosilicic acid from fertilizer manufacturing, water and air pollution are minimized, and water utilities have a low-cost source of fluoride available to them."
The EPA regulates fluoride as a "contaminant" in drinking water. The EPA's previous "Maximum Contaminant Level" for fluoride was 1.4 - 2.4 mg/liter, but in 1985 it was raised to 4.0 mg for unscientific reasons.
Documents show EPA management allowed political pressures to trump the clear consensus among its scientists that 4.0 ppm was unsafe.
Acknowledging the toxicity of fluoride at 4.0 mg/l in drinking water,
yet insisting it's safe at the "optimal" 0.7 mg/l, is like saying:
"You can get drunk on whiskey (40% alcohol)
but not on beer (7% alcohol)."