As oil production continues to boom in the Powder River Basin, illegal wastewater dumping is a growing problem. Kodiak Oilfield in Converse County was recently cited for illegally dumping produced water, one of 14 water violations in the state so far this year.
Oil fields typically produce about twice as much water as they do oil – water that is high in sodium content and contains hydrocarbons. Dumping this water into streams, rivers, or fields could interfere with natural habitat, soil, and water quality.
A study found that if wastewater were injected into a deep portion of the Madison Aquifer, it could potentially contaminate drinking water supplies in other areas.
Encana Oil and Gas has asked for permission to dispose of brine and drilling waste in the aquifer. The company says it would inject the waste into an area where water quality is already poor and which is so deep that it would be an impractical source for drinking water, regardless.