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A top North Dakota regulator said Tuesday more than 240,000 gallons of natural gas liquid were recovered from a 2015 processing plant spill as a well-known environmental blog suggested the state downplayed the incident.

DeSmog reported Monday that an unidentified whistleblower said the underground pipeline spill at Oneok's Garden Creek gas plant in Watford City totaled more than 11 million gallons. A state incident report lists the leak at only 10 gallons, but it notes that the "ground around the pipe was saturated with natural gas condensate of an unknown volume."

Dave Glatt, director of North Dakota's Department of Environmental Quality, said his agency was gathering more information about the spill but argued the 11 million gallon figure is "way out of line." State officials say the leak was contained to the gas plant site and hasn't affected drinking water sources.

Bill Suess, the department's spill investigation program manager, acknowledged that it was a "significant spill" but said they can't pin down a specific figure because the line wasn't "metered" and some of the condensate had already evaporated. He said the department hasn't updated the 10 gallon figure on its incident report because of state laws against altering documents.