Water quality issues are complex and dynamic in nature and need urgent attention and action. Improving efficiency of water use requires regulatory frameworks that better reflect how different water uses require different water qualities, such as water from industrial processes being reused in agriculture. Drafting regulatory instruments to better manage water qualities that are ‘fit for purpose’ can benefit from the wide range of standards and guidelines currently available. The Compendium contains a selection of recent water quality guidelines and standards for different uses.