The Environmental Protection Agency launched a federal audit -- Governor Rick Snyder appointed a panel to look into it -- and there is a federal class action lawsuit underway.
Everyone wants to know how the water went bad in one of Michigan's biggest cities.
To get a sense of how this happened in Michigan, scroll through the timeline below.
Scrolling through the timeline, you get a sense for how the state takeover in Flint led to a series of decisions that were more than just "not fully understood," as Snyder later put it, but seemingly negligent in how officials reacted to mounting evidence that the water was poisoning some kids in the city.
A revolving door of emergency managers who are not accountable to the people of Flint seemed to think the city had an image problem, not an actual problem with lead in its water supply.
See the major moments as they unfolded below.
(If the timeline doesn't load correctly for you below, go here.)