A failed valve at a fracking well in Mountrail County, ND, spilled 830 barrels of saltwater, but the mess ended quickly cleaned up, officials said.
Norwegian energy company Statoil owns the well about six miles southwest of Ross, ND.
A failed valve caused a tank to overflow Wednesday, said officials at the North Dakota Oil and Gas Division.
Officials said the spill ended up contained on the well location and all of the spilled fluid ended up recovered. A barrel holds 42 gallons.
Saltwater is a byproduct of oil production. It is many times saltier than seawater and the state treats it as an environmental hazard.
This incident is just another in a long string of incidents in the North Dakota oil patch.
Earlier this month, a mechanical failure at the wellhead created an out of control well in North Dakota and it took workers two days to contain it and get it under control. North Dakota oil regulators said the well that leaked oil, gas and brine for more than two days.
That incident resulted in the release of 650 barrels of oil and 520 barrels of brine.