According to West Virginia’s Department of Health and Human Resources, 10 hospitals in West Virginia have so far treated 332 cases...after a chemical spill on Thursday contaminated the potable water for 16 percent of the state’s population...[Many were] exposed to the chemical before she knew about a regional ban on water use. But even though the water bans have been lifted in many of the affected [areas]...people complaining of symptoms from the spill continue to pour into emergency rooms. Rahul Gupta, health officer for the Kanawha-Charleston Health Department, told the Charleston Daily Mail that [many]...patients claiming water-related symptoms...said they used water after the ban was lifted in their area...[Not] much is actually known about the chemical...which is used to wash coal. Up to 7,500 gallons of it spilled into the Elk River after leaking from a tank operated by Freedom Industries... [also refers to West Virginia American Water (part of American Water)]