How did lead get in the flint water?

Lead entered the Flint water supply primarily due to the corrosion of aging pipes after the city switched its water source to the Flint River in 2014. The river water was not treated properly, leading to the leaching of lead from the old lead service lines and Plumbing into the drinking water. This situation was exacerbated by the lack of corrosion control measures, which are typically implemented to protect against such contamination. As a result, residents were exposed to elevated levels of lead, leading to a public health crisis.