npj Clean Water publishes high-quality papers which report cutting-edge science, technology, application, policy and societal issues that contribute towards a more sustainable supply of clean water. Papers published in the journal may also support and accelerate Sustainable Development Goal 6, 'Clean water and sanitation'. Representative journal scope: drinking water and wastewater treatment by physical, chemical or biological means, including research at the interface of these approaches. new materials and process technologies for water and wastewater treatment, including membranes, advanced oxidation, nano-enabled materials and processes. desalination of seawater, groundwater and non-traditional wastes like municipal and industrial wastewater for recycling or reuse. advances in measurement and detection of regulated water quality parameters, as well as real-time monitoring of pathogens and emerging contaminants. software and hardware innovations related to reliable and efficient clean water distribution and supply, including machine learning, Internet of things and big data analyses. broader issues related to the supply of clean water beyond natural sciences, including topics such as education, funding, policy, intellectual property and impact on society.