As climate change gathers momentum, we can expect periods of drought to occur more frequently and last longer, ultimately undermining the security and stability of Switzerland’s water management. We helped the Swiss Federal Office for the Environment (FOEN) to prepare a response to a legislative query on current and future water demand and needs, existing disposable water reserves, and approaches to conflicts arising in connection with water scarcity. In a separate short report, we assessed the water-use data the government would need to meet its obligations and the extent to which such data are available at federal or cantonal levels.