There’s no doubt that customers of Padre Dam Water District, already paying among the highest rates in the nation, will pay even more for the coming year. It’s just a matter of how much. At its April 2 meeting, PDWD’s board of directors heard from the San Diego County Water Authority General Manager Dan Denham about all the various reasons his agency will probably increase what it charges for the water it imports from the Metropolitan Water District of Southern California (Metro), the Los Angeles-based agency that transfers water south from both the Colorado River and the Sacramento-San Joaquin Delta. … For the coming fiscal year, Denham said the CWA board hasn’t set the figure yet (some reports put it at 14 percent), but he expects the increase to be in “the double-digit range” and the following year to be in the single digits.