Marathon Saint Paul Park Refinery - Oil Refinery in Grey Cloud Island Township, Minnesota

Marathon Saint Paul Park Refinery is an operational oil refinery situated in Grey Cloud Island Township, Washington County, Minnesota, United States. The facility is part of Marathon Petroleum Corporation's refining network and serves the Upper Midwest region with refined petroleum products. The refinery operates under the regulatory framework of the U.S. Environmental Protection Agency (EPA), including the Clean Air Act (CAA) Refinery MACT standards for air emissions and the Clean Water Act for wastewater discharges. As a typical medium-to-large refinery in the United States, it employs standard refining technologies such as atmospheric distillation, catalytic cracking, and hydrotreating to produce gasoline, diesel, and other fuels. The facility's location along the Mississippi River provides access to crude oil supply via pipeline and barge, as well as product distribution to downstream markets. Its operational significance lies in supplying transportation fuels and heating oil to the surrounding region, supporting local economic activity and energy security.

The refinery is situated near the Mississippi River, which poses potential spill risks to aquatic ecosystems. The facility's operations involve handling large volumes of crude oil and refined products, requiring robust spill prevention and response measures. Air emissions from refining processes are regulated under the EPA's Refinery MACT standards to minimize impacts on local air quality. The surrounding area includes mixed industrial and residential land use, with the river providing critical habitat for fish and wildlife.