This paper outlines the work of the Water Regulations Advisory Committee and will present the main outcomes of its recommendations. The impact of the new Water Regulations on the design and operation of water supply and drainage systems within buildings will be discussed with a particular emphasis on the areas of reduced flush volume introduction, specifically a 6 liter/3 liter dual flush recommendation, reduced shower flows and the introduction of non-siphonic modes of w.c. flushing apparatus, including both the drop valve and other innovative methodologies. Also discussed are both the engineering and "political" aspects of this change in United Kingdom practice, introd along with introducing the continuing remit of WRAC to audit the efficiency of the Water Regulation encorcement process over the first two years of implementation. Includes 23 references.