Dozens of San Diegans are howling over soaring water bills, complaining on social media and to the city. In response, Mayor Kevin Faulconer has promised every complaint will be reviewed and independent City Auditor Eduardo Luna has promised to conclude that review by June. City utilities officials have a range of explanations for the spikes, starting with meter-reading errors, higher usage because of warmer weather, leaks in water systems and homes, a 6.9 percent rate increase that took effect Aug. 1, and a change that led to one bill covering more days.