 The Global Compendium on Water Quality Guidelines and Standards for different uses is a joint initiative between IWA and the United Nations Environment Program under the umbrella of UN Water. Water quality affects water quantity in different ways, so we can use polluted water for different uses like drinking water, bathing water, industrial water use. And so for efficient water management and wise water use, we need to consider that different uses require different water qualities. The Compendium aims to be a reference tool for regulators and policy makers all over the world, but eventually to reach out to all water users in different sectors. And it's going to provide a state-of-the-art overview of water quality guidelines and standards for aquatic health, public health and resource efficiency. These guidelines are also going to be collected in a database that is going to be available to the public and it's going to enable further on this discussion on water security. Therefore, we're going to create a platform for scientists, policy makers, regulators and stakeholders all over the world to keep on working, promoting wise water use and efficient water management.