ArcelorMittal Indiana Harbor - Integrated Steel Mill in East Chicago, Indiana

ArcelorMittal Indiana Harbor, located at 3210 Watling Street in East Chicago, Indiana, is a major primary metal facility operating under NAICS code 331111 (iron and steel mills). As part of the global ArcelorMittal group, this plant is one of the largest integrated steel mills in North America, with significant production capacity for flat-rolled steel used in automotive, construction, and industrial applications. The facility operates under the regulatory framework of the United States Environmental Protection Agency (EPA), including the Clean Air Act (CAA), Clean Water Act (CWA), Resource Conservation and Recovery Act (RCRA), and Toxics Release Inventory (TRI) Section 313 reporting. As a large integrated steel mill, it involves coke production, ironmaking, steelmaking, and finishing processes, each subject to specific emission limits and permitting requirements. The plant's location in the Great Lakes region also subjects it to additional environmental oversight under the Great Lakes Water Quality Agreement. This facility plays a critical role in the regional industrial economy, supplying steel to downstream manufacturers across the Midwest. Its environmental significance stems from the high energy intensity and emissions associated with integrated steelmaking, including greenhouse gases, particulate matter, and hazardous air pollutants. The plant's proximity to Lake Michigan and residential communities in East Chicago necessitates rigorous environmental management and community engagement.

East Chicago, Indiana, is part of the heavily industrialized Calumet region along the southern shore of Lake Michigan. The area has a long history of steel production and heavy manufacturing, leading to legacy environmental concerns such as soil and water contamination. The local population faces potential exposure to industrial emissions, including particulate matter and volatile organic compounds. The facility's operations contribute to regional air quality challenges, particularly in the context of the Chicago metropolitan area's non-attainment status for ozone and fine particulate matter under the Clean Air Act.