We have conducted a strategic exploration of the drinking water supply in Overijssel after 2040. This strategic exploration critically analyses the present drinking water supply in the light of a number of social developments in Overijssel and in the rest of the world. It is a stimulus to take action, preserving the qualities of the present drinking water supply while at the same time investigating ways of taking advantage of new opportunities. In the strategic exploration, whose foundations were laid in three intensive workshops with some twenty representatives of organisations involved, we visualised the consequences of a very wide variety of future drinking water supply scenarios.