Yes you are.From the Water Industry Act 1991:
A water undertaker imposing a prohibition or restriction under this section shall, before it comes into force, give public notice of it, and of the date on which it will come into force, in two or more newspapers circulating in the locality affected by the prohibition or restriction.
But there's no need to notify everyone individually.
(,
Thu 5 Apr 2012, 16:49,
archived)
A water undertaker imposing a prohibition or restriction under this section shall, before it comes into force, give public notice of it, and of the date on which it will come into force, in two or more newspapers circulating in the locality affected by the prohibition or restriction.
But there's no need to notify everyone individually.