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Jordan Houston

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Pittsburgh Water and Sewer Authority workers try to reach valves that control the flow of water in and out of Highland Park Reservoir No. 1 outside the membrane filtration plant in Highland Park neighborhood of Pittsburgh on Tuesday, Jan. 31, 2017. Tests by the state Department of Environmental Protection showed low levels of chlorine in water at a facility that draws water from the city’s Highland Park reservoirs. (Rebecca Droke/Pittsburgh Post-Gazette via AP)

Millions consumed potentially unsafe water in the past 10 years

Agnel Philip, Elizabeth Sims, Jordan Houston, Rachel Konieczny