Health officials say the spill was due to a piping connection leak on a well pad about 11 miles northwest of Parshall. The site is operated by EOG Resources Inc.
Initial estimates indicate about 10 barrels of oil were released, and the oil came into contact with a slough about 150 feet east of the well pad.
The release was identified Thursday and was reported by the company the same day. Staff from the North Dakota Oil and Gas Division and the Health Department have been working at the site and will continue to monitor the investigation.