Local water agency wades into water war One of the San Gabriel Valley’s biggest wholesale water districts has jumped into a water war being waged by San Diego County against the Metropolitan Water District of Southern California. Three Valleys Municipal Water District has joined the legal action on the side of Metropolitan, accusing plaintiff San Diego County Water Authority of bungling a side water purchase from Imperial County and trying to make MWD’s 26 water agencies pay for the blunder. Help spread the word! Share this article:Tweet