Leslie A. Russell, D.M.D.
363 Walnut Street
Newtonville, Mass. 02160
Dear Dr Russell;
Thank you for your letter of
March 9, 1983, in regard to the fluoride of drinking water.
Water treatment chemicals,
including fluosilicic acid, have been evaluated for their potential
for contributing to the contamination of drinking water. The
Water Treatment Chemicals Codex, published by the National Academy
of Sciences, prescribes the purity requirements for fluosilicic
acid and other fluoridation chemicals.
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 long standing problem.
By recovering by-product fluosilicic acid from fertiliser
manufacturing, water and air pollution are minimized, and water
utilities have a low-cost source of fluoride available to them.
I hope this information adequately responds to your concern.
Deputy Assistant Administrator for Water