The Wisconsin Department of Justice reached a $1 million settlement Thursday over air pollution violations with an energy company responsible for two oil spills in the Midwest this year.

Enbridge Energy will pay the state over claims the company failed to acquire and follow multiple management permits for its facility in Superior, Wis., since 2001, according to the DOJ.

Since the facility in Superior is classified as a stationary source of crude oil and natural gas, it is required to follow state operation regulations to limit air pollution.

The DOJ first filed its lawsuit against Enbridge Energy, and since then, the company has been working with the Wisconsin Department of Natural Resources to correct the complaints brought against them and guarantee cooperation with the environmental laws in the future.

Attorney General J.B. Van Hollen emphasized in a statement how essential permitting and monitoring a facility is, especially one as large as Enbridge Energy’s Superior site.

“The Wisconsin Department of Justice will continue to work with the [Department of National Resources] to ensure that Wisconsin’s citizens and natural resources are protected through compliance with the law,” Van Hollen said.

The settlement comes after the company has been implicated in a series of oil spills in the Midwest in the last six months.

The company was responsible for an oil pipeline leak in Marshall, Mich., that led to high pollution of the Kalamazoo River in July, according to the Environmental Protection Agency.

The EPA was still managing the clean up at the Michigan spill when another Enbridge pipeline began spilling in Romeoville, Ill., a southwestern suburb of Chicago. That line runs from Superior to Griffith, Ind.

The DOJ settlement is also not the first time the energy company has shelled out money to Wisconsin over environmental issues.

Enbridge Energy paid $1.1 million to the state in 2009 over complaints the company violated wetland protection permit conditions in construction of a Wisconsin pipeline.