Does anyone have further information on what is happening in Flint Michigan and their water supply?

I heard the water has been contaminated with lead..?

During the debate Hillary Clinton said the following:

"I think every single American should be outraged," Clinton said. "We've had a city in the United States of America where the population, which is poor in many ways and majority African-American, has been drinking and bathing in lead-contaminated water. And the governor of that state acted as though he didn't really care."

The Republican candidates said they had not been briefed on this crisis...what??