www.westvirginiaamwater.com or call 855-390-4569. Once the "do not use" order is lifted, there is a specific flushing process that residents must follow strictly before they can resume using water. Instructions on the flushing process are available at http://www.dhsem.wv.gov/Documents/How to Flush Your Plumbing System.pdf. Much of the Kanawha Valley is now in its seventh day without water since a coal-processing chemical leaked out of a tank at Freedom Industries and into the Elk River, contaminating the water supply. Schools in Kanawha, Putnam, Lincoln, Boone and part of Fayette counties remain closed, for the fourth day since the leak was detected. The Kanawha County Public Library system opened its Dunbar branch on Wednesday afternoon, after opening its Charleston and St. Albans branches on Tuesday. West Virginia American Water and government officials continue to test water samples throughout the region. They cannot restore water service to an area until tests from that area consistently return levels below 1 part per million of Crude MCHM, the chemical that was spilled. The 1 part per million threshold was established by the federal Centers for Disease Control, but it is unclear how that number was derived. The CDC has not responded to repeated requests for comment. As of early Wednesday afternoon, state Department of Health and Human Resources spokeswoman Allison Adler said a total of 332 patients had been seen at 10 area hospitals with symptoms that may be related to the spill. Of those, she said, 14 patients were admitted to various hospitals, but none of them remained there on Wednesday. Poison-control centers had received more than 1,700 calls, Adler said. Of those, more those 1,400 involved people, 76 involved animals, and more than 250 were for information only.