Re “County water move has its costs” (July 1): The San Diego Union-Tribune addressed an important regional question on whether the San Diego County Water Authority’s decades-long strategy to create a reliable portfolio of water supplies is worth the cost. Unfortunately, the story omitted clear-cut evidence that the region’s supply reliability strategy is an unqualified success: Our independent water supplies from the Colorado River are both less expensive and more reliable than supplies from the Metropolitan Water District of Southern California, which have been cut twice in the past decade by drought.