Water crisis in Flint, Mich.

Flint, Mich., resident Glaydes Williamson holds up water from Flint and hair pulled from her drain, during the House Oversight and Government Reform Committee hearing to examine the ongoing situation in Flint on Capitol Hill in Washington.

Witnesses, from left, Joel Beauvais, Keith Creagh, Marc Edwards and LeeAnne Walters are sworn in on Capitol Hill on Feb. 3, 2016, in Washington prior to testifying before the House Oversight and Government Reform Committee hearing to examine the water crisis in Flint, Mich. Beauvais is acting deputy assistant administrator of the Environmental Protection Agency’s Office of Water. Creagh is director of Michigan’s Department of Environmental Quality. Edwards is a professor of environmental and water resources engineering at Virginia Tech. Walters is a Flint resident.

Flint, Mich., resident Sharon Moore walks out of the hearing room on Capitol Hill in Washington following a House Oversight and Government Reform Committee hearing to examine the water crisis in Flint, Mich.

Flint, Mich., resident Jessica Owens holds up a bottle of water from her home while attending the House Oversight and Government Reform Committee hearing to examine the water crisis in Flint.

Flint, Mich., Mayor Karen Weaver drinks from a bottle of water beside Michigan Department of Environmental Quality Director Keith Creagh as Gov. Rick Snyder fields questions from reporters about the Flint water crisis during a news conference at City Hall on Jan. 27, 2016, in Flint.

The Flint River flows in downtown on Jan. 17, 2016, in Flint, Mich. President Barack Obama declared a federal emergency in Michigan, which will free up federal aid to help the city with its contaminated water crisis. Amid mounting criticism, Gov. Rick Snyder had requested emergency and disaster declarations and activated the National Guard to help the American Red Cross distribute water to residents.