"We all care about lead in Flint now, which is great," Oliver said. "Unfortunately, the problem is not just in Flint. A USA Today network report found lead contamination in almost 2,000 additional water systems spanning all 50 states." (To see your neighborhood's risk of elevated lead levels, head here.)
At least 2.1 million homes have lead paint exposure risk and kids under six years old. As a result, more than half a million kids have elevated blood levels, according to the Centers for Disease Control and Prevention.