from cnn.com: Days after they told some West Virginia residents they shouldn’t worry about drinking tap water contaminated with a chemical used to clean coal, local health officials issued a new advisory this week. Pregnant women, they suggested, might want to stick to drinking bottle water. In new guidance issued Wednesday night, West Virginia health officials advised pregnant women to wait to drink tap water until there are no detectable levels of the chemical in it. So how safe can the tap water be, if pregnant women shouldn’t drink it?