The Environmental Protection Agency says it's regional director Susan Hedman will resign because of the agency's handling of the crisis.
Also, the agency is taking over lead sampling in Flint after sharply criticizing local and state officials, calling their inaction an "imminent and substantial danger" to Flint residents.
In a letter to Gov. Rick Snyder, the EPA "is deeply concerned by continuing delays and lack of transparency and has determined that the actions required by the order ... are essential to ensuring the safe operation of Flint's drinking water system and protection of public health."
EPA Administrator Gina McCarthy wrote the letter which said the agency will work with the city to oversee and participate in the collection of lead and copper rule drinking water samples by Flint residents.
Earlier on Thursday it was announced that EPA regional director Susan Hedman's was resigning in connection to the Flint water crisis.