This Tuesday, Jan. 31, 2017 photo shows a Highland Park Reservoir where low chlorine levels have caused the Pittsburgh Water and Sewer Authority to issue a precautionary boil order in the Highland Park neighborhood of Pittsburgh. Insufficient chlorine in Pittsburgh's public water supply led to the closure Wednesday of some schools and a boil-water advisory in neighborhoods that include the University of Pittsburgh and Carnegie Mellon University. (Rebecca Droke/Pittsburgh Post-Gazette via AP)
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