This chapter looks at the infrastructure of blue (water resources) in Bahrain's built environment, as well as the efficacy of blue in keeping the country green. Beginning with a description of the Bahraini light and the colors of the sea, from technical, historical, and social perspectives, the chapter studies the water system and the politics of treated sewage effluent (TSE). Over half the water of the state is used in the irrigation of green space in Bahrain—an indication of the enormous value accorded to green. Because Bahrain is an island, the intensity of the light and the colors it animates are amplified due to the humidity generated by the surrounding sea.