Carlsbad, Calif. – The Claude “Bud” Lewis Carlsbad Desalination Plant maintains an investment grade rating in the latest report from Fitch Ratings, affirming the plant’s sound financial management and its ability to provide a stable, reliable source of drinking water to the San Diego region.  As the largest, most technologically advanced and energy-efficient desalination plant in the nation, the Carlsbad Desalination Plant’s revenue stability stems from an effective collaboration between Poseidon Water and the San Diego County Water Authority.