WAYNESBURG, Pa. (AP) -- The former owner of a Pittsburgh-area waste water firm has pleaded guilty to dumping millions of gallons of water containing natural gas drilling byproducts, sewage sludge and restaurant grease into streams and mine shafts in a six-county area.

Robert Allan Shipman, 50, of New Freeport, also pleaded guilty to theft counts for taking money from his customers, who believed their waste was being properly disposed of, according to The Observer-Reporter.

As part of Shipman's guilty plea in Greene County, he has sold his interest in Allan's Waste Water Services Inc., will pay a $100,000 fine and a $25,000 nondeductible donation to an environmental group.

State prosecutors said Shipman illegally dumped the water from 2003 to 2009 in Allegheny, Fayette, Greene, Lawrence, Washington and Westmoreland counties.