Support WBURLethal Pneumonia Outbreak Caused By Low Chlorine In Flint WaterPlay02:38Download AudioRebecca HersherFebruary 05, 2018 ShareScientists say low chlorine levels in Flint's water system during the city's water crisis in 2014 and 2015 led the bacterium Legionella pneumophila to proliferate, causing a deadly outbreak of Legionnaire's disease. (Science Source)