§ Mr. David Mitchellasked the Secretary of State for the Environment in which parts of England sodium fluoride, in the form used for the fluoridation of water supplies for human consumption occurs naturally, in the same or greater strengths as that in which it is added to water supplies on the recommendation of his Department.
§ Mr. Denis HowellFluoride concentrations in water are measured in terms of the fluoride ion, not of sodium fluoride. Fluoride occurs naturally in ground waters in parts of Buckinghamshire, Bedfordshire, Cleveland, Derbyshire, Dorset and Essex at concentrations at or somewhat greater than one part per million, which is the level recommended by my right hon. Friend the Secretary of State for Social Services where fluoride is added.