The Water Protection Zone (River Dee Catchment) Designation Order 1999
Section 93 of the Water Resources Act 1991 (“the 1991 Act”) gives the Secretary of State power to designate any area as a water protection zone if, in relation to that area, it is appropriate, with a view to preventing or controlling the entry of any poisonous, noxious or polluting matter into controlled waters, to prohibit or restrict the carrying on in that area of activities which the Secretary of State consider are likely to result in the pollution of any such waters.