An image provided by the Environmental Protection Agency shows examples of a lead pipe, left, a corroded steel pipe, center, and a lead pipe treated with protective orthophosphate. The EPA is only now requiring water systems to take stock of their lead pipes, decades after new ones were banned. (Environmental Protection Agency)
It took three years for officials to notice lead was seeping into the city's drinking water.
Missouri regulators had given the green light in 2014 for Trenton to start adding monochloramine to its drinking water to disinfect it without the harmful byproducts of chlorine.
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