Federal prosecutors allege a Kansas metal finishing firm dumped untreated wastewater into a city sewer system.
A 24-count indictment filed late Wednesday also accuses C & R Plating and its owner, Kevin L. Cline, with submitting fraudulent samples and reports of analysis to conceal the pollution from state environmental regulators.
Cline did not immediately return a message left Thursday at his office in Minneapolis, Kan.
The indictment charges the company and its owner with 20 Clean Water Act violations, making a false statement to the Kansas Department of Health and Environment, illegally introducing pollutants into the sewer system, among other charges. The wastewater from the firm contained high zinc levels.
Treated wastewater from Minneapolis is discharged into the Solomon River via Lindsey Creek and a tributary.