HC Deb 26 February 1985 vol 74 c99W
Mr. Best

asked the Secretary of State for the Environment if any studies have been brought to his attention which indicate that fluoride when added to the water supplies has a corrosive or degenerative effect on the vessels through which it passes.

Mr. Macfarlane

No. Fluoridation schemes have been in operation in various parts of the country for up to 30 years and there is no evidence that the addition of fluoride at a concentration of one part per million has had any effect on the corrosive properties of the water. An American water works association manual on fluoridation states that there has been no reported instance of pipeline corrosion in the United States traceable to the fluoride content of water.