The Michigan Department of Environmental Quality proposed a five-part strategy to federal officials Monday to determine whether Flint's lead-contaminated drinking water is safe to drink.
The plan to ensure drinking water is no longer tainted with lead includes testing at residences, schools, and food services, as well as blood testing and testing Flint's water distribution system.
The goal would be to come up with a reliable assessment for the water system by April 14.
Financially strapped Flint switched its source of tap water from Detroit's system to the nearby Flint River in April 2014, in order to save money. The more corrosive water from the Flint River leached lead from the city pipes.
Residents complained of various health problems after the switch, despite officials' assurances that the water was safe.
Flint, which is about 100 kilometers northwest of Detroit, returned to using that city's water in October after tests found elevated levels of lead in the water and in the blood of some children.
Michigan Governor Rick Snyder has repeatedly apologized for the state's poor handling of the issue.