Over 1,000 city of San Diego water customers have complained about bill spikes and other billing problems so far this year, hundreds more than the city has previously acknowledged and far more than in recent years. But the number of customers who experienced dramatic bill spikes could be even higher than just those who’ve complained to the city. Hundreds if not thousands more customers experienced billing spikes in 2017 and early 2018, according to an analysis of water department billing records by Voice of San Diego and NBC 7 Responds.