Posted: 03/09/2015 at 23:22
Councils in the UK do not have any responsibility for water supply so can't put any chemicals in it. In England and Wales private companies are responsible, Scottish Water is a publically owned company answerable to the Scottish Parliament.
It should be possible to see details of your water supply quality on your water supplier's website which will give you a detailed chemical analysis of your tap water. This is governed by EU legislation and enforced by the Drinking Water Inspectorate in England and Wales.