§ Mr. Gordon Prentice
To ask the Secretary of State for Health if he will list the sources, in each case, of the fluoride used to fluoridate water supplies in England. 
§ Ms Jowell
About half a million people in this country receive water which is naturally fluoridated at or about the optimum level of one part per million. A further one million people receive water which is naturally fluoridated at a lower level, but which still confers some dental benefit. Some 5 million people receive water where the fluoride content has been artificially increased to a level of one part per million. Information on the sources from which water companies obtain fluoride is commercially confidential and is not routinely collected by government.