BISMARCK — A pipeline leak on a Williams County well pad resulted in oil being spilled on nearby grassland, the North Dakota Department of Environmental quality said Friday, Aug. 2.

Initial estimates indicate 10,080 gallons of oil spilled on the north side of Williston Thursday, with less than 5,880 gallons making its way onto grassland south of the well pad, said Brian O'Gorman, environmental scientist for the DEQ.

The well pad and pipeline are operated by Samson Oil and Gas USA, Inc.

The spill has been contained and 4,200 gallons have been recovered. Remediation of the area is ongoing, and DEQ personnel are monitoring the incident.

O'Gorman said a specific cause hasn't been pinpointed, but they weren't aware of any water sources being affected.