This presentation examines how wastewater treatment works can be operated more effectively as regulatory expectations, environmental pressures and operational complexity continue to increase. Rather than focusing on new infrastructure, it considers how existing assets can be adapted to meet tighter nutrient limits, reduce pollution risk and improve overall performance. Based on operational experience from large treatment works, the presentation will show how better use of data and carefully targeted digital tools can improve understanding of process behaviour and support more stable, confident operation. It will highlight how improved data visibility and process modelling can help operators anticipate issues, respond more effectively to changing conditions and maintain compliance with low total nitrogen and phosphorus consents, while also reducing unnecessary energy and chemical use. The use of digital twins will be discussed as a practical way of exploring operational constraints and testing alternative operating strategies, supporting planning and decision making without replacing operator judgement. The presentation will also reflect on lessons learned during implementation, including challenges around data quality, operator engagement and governance. Finally, it will consider how extending these approaches beyond the treatment works can support improved management of storm flows, trade effluents and wider catchment pressures.