The Controlled Waters (Lakes and Ponds) Order 1989
Chapter I of Part III of the Water Act 1989 (control of pollution) applies to waters of various classes including waters of certain reservoirs. This Order defines as waters to which Chapter I applies other reservoirs except those which contain water that has been treated with a view to complying with regulation 23 of the Water Supply (Water Quality) Regulations 1989 (S.I. 1989/1147).