As California coastal cities look for methods to avert the harsh realities of the state’s second drought in a decade, desalination has returned as a hot topic. In San Diego County, the drought makes the argument that the controversial choice to build a coastside desalination plant was correct. The Claude “Bud” Lewis Carlsbad Desalination Plant opened in Carlsbad in 2015. It supplies water to the San Diego County Water Authority, a wholesale agency that supplies about three-quarters of the water used within its 3.3 million population service area for 24 member agencies.