These Guidance Notes are intended as an introduction for leakage practitioners to the benefits, design and management of active leakage control activities based on the use of District Metered Areas (DMAs). It is part of a series of Guidance Notes prepared by the IWA Water Loss Task Force to cover all aspect of Water Loss Management.

The Guidance Notes are aimed at leakage practitioners that have little or no experience of leakage control using DMAs, and has drawn on the experience of leakage engineers all over the world to create a best practice for DMA management. The Guidance Notes should be seen as a general guide which must be adapted to local conditions.