Mayor Anthony Copeland told residents he sent letters to Gov. Mike Pence and Lt. Gov. Eric Holcomb requesting the emergency declaration.
The EPA found unsafe levels of lead in the drinking water of some homes.
President-elect Donald Trump says he wants to do away with unnecessary regulations, including the EPA's Waters of the U.S. rule.
Trump will nominate Oklahoma Attorney General Scott Pruitt to be the next Environmental Protection Agency administrator.
A new lawsuit is the first to single out DuPont and Atlantic Richfield, two chemical companies that have taken on legally responsibility for the hazards.
A Superfund is a site designation by the EPA to receive state and federal money to clean up hazardous waste that poses a threat to public health.
The Clean Power Plan would require power plants nationwide to reduce carbon emissions by 30 percent by 2030.
Thirty years after officials found high levels of lead and arsenic at an East Chicago lead smelting plant, clean-up has begun. Why did it take so long?
The EPA says it will begin removing lead-tainted soil later this month from as many as 100 homes around the site of an old industrial smelter.
EPA plans to begin removing in late September about two feet of lead-contaminated soil from residential yards in the Martindale-Brightwood neighborhood.