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People can get sick if they inhale mist or vapor, typically from cooling systems, and there were nearly 100 cases in the Flint area, including 12 deaths, in 20.
Lyon is the highest-ranking member of Governor Rick Snyder's (pictured left) administration to be snagged in the criminal investigation. Eden Wells (pictured right), has also been charged with obstruction of justice and lying to a police officer.
The head of the Michigan health department was charged with involuntary manslaughter Wednesday after failing to give proper warning of Flint's lead-contaminated water.
Nick Lyon is accused of failing to alert the public to an outbreak of Legionnaires' disease in the Flint area, which has been linked by some experts to poor water quality in 20.