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Another defendant charged with dumping oil-field waste into Ohio’s Mahoning River pleaded guilty in federal court in Cleveland Monday

Mark A. Goff, 46, of Newton Falls, admitted violating the Clean Water Act.

He faces up to three years in prison and a fine up to $250,000.

Sentencing is set for July 7.

Goff was an employee of Hardrock Excavating.

The company and its owner, Ben Lupo, 63, and another employee, Michael P. Guesman, 35, of Cortland are also charged in the case.

Lupo pleaded guilty. He’ll be sentenced June 16.

Guesman pleaded guilty and was sentenced to three years probation and 300 hours of community service.

The case against Hardrock is pending.

Goff and Guesman emptied liquid waste from storage tanks in Youngstown into a storm-water drain at Lupo’s direction multiple times in late 2012 and early 2013, according to court records.

The toxic dumping triggered a $3 million cleanup.