Water Research X is a Gold Open Access sister journal of Water Research, featuring concise, letter-style, leading-edge research papers, visionary perspectives and editorials, and mini-reviews of emerging topics. The Journal welcomes contributions on all aspects of the science and technology of the anthropogenic water cycle, water quality, and its management worldwide. A broad outline of the journal's scope includes: • Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; • Urban hydrology including sewer systems, storm water management, and green infrastructure; • Drinking water treatment and distribution; • Potable and non-potable water reuse; • Sanitation, public health, and risk assessment; • Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; • Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; • Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; • Environmental restoration, linked to surface water, groundwater and groundwater remediation; • Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; • Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; • Socio-economic, policy, and regulations studies. Water Research X is an interdisciplinary journal with an applied edge. This means that papers that go into too many details of one of the supporting disciplines (such as chemistry, toxicology, microbiology, material sciences, etc.) without making a good link with water researching general may be rejected up-front. Water Research X has changed its paper structures, please find details in Guide for Authors (with a link to the page). EDITOR-IN-CHIEF: Professor Zhiguo Yuan, The University of Queensland Australian Centre for Water and Environmental Biotechnology, Brisbane, Australia