The aim of this project was to collate evidence related to prevention-led approaches within catchments, that was of relevance to Scotland and the benefits that they could bring to safeguarding drinking water supplies. This project sought views, nationally and from other EU (and international) countries, on how or what they have learnt from implementing a prevention-led approach. A project workshop focussed on two key pressures on Scottish drinking water supplies: organics (e.g. Dissolved Organic Carbon) and Taste and odour issues. The project outputs include information on the long listing exercise of potential cases which fitted the project criteria and detailed case study templates for the four short-listed cases.