BISMARCK, N.D. (AP) — State environmental officials say a spill of oilfield wastewater caused by a faulty valve has affected some pastureland in western North Dakota.

The state Department of Environmental Quality said the 12,180-gallon produced water spill happened on Saturday at a well pad about 14 miles east of Watford City. State environmental scientist Bill Suess said only about 168 gallons of produced water escaped the well site.

He said about 800 square feet of pastureland was affected. He said no water sources were harmed.

Another pipeline spill of oilfield wastewater has affected cropland in northwestern North Dakota.

State environmental scientist Bill Suess said regulators were notified Monday of the 8,400 gallon pipeline leak in Renville County. The pipeline is operated by Wichita Falls, Texas-based Cobra Oil and Gas. The spill of produced water happened 2 miles north of Sherwood, and within a 1 mile of the U.S.-Canada border.

About 1,000 square feet of cropland was affected.