Last week, Marin Municipal Water District won a legal victory when the state supreme court declined to review an appellate court ruling that found its environmental impact report of a proposed desalination plant adequate. In May, the appellate court overturned a ruling by Marin Superior Court Judge Lynn Duryee, who ruled that the EIR was lacking, writing that a desalination plant was “unnecessary because water conservation costs nothing, has no negative environmental effects and is…