City staff members are set to give an update on the investigation and remediation of residential water bill overcharges at a City Council committee meeting Thursday, three weeks after Mayor Kevin Faulconer announced that an audit of the utility’s billing practices was being fast- tracked. City officials in February discovered problems with some customers’ water bills after hearing weeks of complaints. Some residents saw their charges skyrocket by as much as 400 percent due to what city officials say was one employee’s misreading of meters.