The technical committees in the field of analytics deal with new methods for identifying new substances and expanding the analytical measurement window (1), (eco)toxicological effects (2), real-time measurements and (3) tools for investigating environmental processes (4). In the area of emissions, sources and transport of trace substances (5), the behavior of polar low-molecular size trace substances (e.g. persistence and (eco)toxicology) (6), formation, distribution and aging of microplastics (7), substance emissions from modern building materials (8), and the spread and behavior of antibiotic-resistant bacteria (9) are addressed. In the area of processes, the focus is on biological processes of pollutant degradation (10), physical processes in the aquatic environment and in treatment (e.g. colloidal mass transport, sorption processes, filtration) (11) and oxidative water treatment methods (12). The Water 4.0 and Climate Change expert committee (13), which integrates all three areas (analytics, emissions and processes), represents a cross-cutting topic. The effects of extreme events and the water management requirements of the future (availability and quality of resources) on the water supply are assessed using digital images (e.g. virtual twin) in the areas of water extraction, treatment and distribution. The aim is to derive strategies for action to ensure an adequate supply of high-quality drinking water in the future.