In 1997 the International Water Association (IWA) embarked on an initiative to standardize water utility performance indicators. As part of this initiative, the Water Loss Task Force (WLTF) was established. The mandate of the WLTF was to reach international consensus on a standard water balance form and terminology and develop and recommend water loss performance indicators. The WLTF was a small group of water utility professionals from around the world and was chaired by Allan Lambert (UK). After this initial work was completed the WLTF broadened its activities by working on international best practice concepts and methodologies for water loss management.

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