As observed by Adam Trexler (2015), climate fiction novels are essentially set in urban areas. It is true that since Babel/Babylon, the city has often been depicted as a place of perdition and destruction, doomed for apocalypse by the wrath of God. The novels under study—AquaTM (2006) and Exodes (2012) by Jean-Marc Ligny, The Waterknife (2015) by Paolo Bacigalupi, and New York 2140 (2017) by Kim Stanley Robinson—were written at a time when the environmental crisis has taken on particular urgency due to global warming. This paper examines the ways in which urban worlds are represented, linking the post-apocalyptic dimension of writing to the dystopian and utopian modalities of narratives that raise the issue of water resources in cities, faced with either droughts or catastrophic floods.