The New York Times offers this compendium of the daunting tasks facing officials as they try to undo what’s been done to the town’s water supply.

“As recently as two weeks ago, some officials in Flint said they hoped that the pipes could be repaired through a process of recoating their insides with phosphates. If that is successful, they reasoned, lead would no longer leach from the pipes into the water supply. But it takes months for the phosphates to take full effect.”

For some answers to a long list of questions, click here.