Madison Aquifer

The Wyoming Oil and Gas Conservation Commission is once again considering a proposal to dispose of oil and gas wastewater in the Madison aquifer in Fremont County.

The proposal would allow waste from the Moneta Divide project to be injected into a 15,000 foot aquifer. Encana originally petitioned for the aquifer exemption back in 2013. Aethon Energy has since purchased the field.

The water in the aquifer is considered to be good quality, but the company has argued that because it is so deep, it won’t ever be used as a drinking water source.

Study outlines risks of injecting waste into aquifer

Jun 27, 2013

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.

The Environmental Protection Agency is asking for more information from Encana before it okays an aquifer exemption allowing the company to pump waste water into the Madison aquifer near Casper.