In the UK you need to contact your local waterboard. Anglian water, the company who deals with the water supply in my area have acknowledged that whilst they do not add fluoride to the water in the vast majority of the boroughs they cover, they are obligated to add fluoride when told to by the relevant health authority, and this decision is dependent on the levels of decay etc. reported in the area.

The water act was changed here in 2003 paving the way for the health authorities to add the anticholinergic neurotoxin hydrafluosilicate to the water supplies whether we like it or not.