Tank overflow blamed for oil, wastewater spill

WILLISTON, N.D. (AP) — North Dakota's Health Department says crude oil and wastewater overflowed from a tank in near Williston, impacting an unknown amount of pastureland.

State environmental scientist Bill Suess (sees) says the tank is on a well pad owned and operated by Kraken Operating LLC. He says the company on Thursday reported the spill that occurred about 16 miles northeast of Williston.

Suess says about 8,400 gallons of oil and produced water overflowed from the tank, and about 420 gallons migrated off the well pad.

Produced water is a mixture of saltwater and oil that can contain drilling chemicals.

Suess says crews were cleaning up the spill on Friday. He says no water sources were affected.