EPA Superfund Site

MISSISSIPPI PHOSPHATES CORPORATION

MS | EPA ID MSN000403508

About this site’s exposure pathways: As of August 2023, there is insufficient information to determine the human exposure status of the Mississippi Phosphate site. This site was listed on the NPL in January 2018. A remedial investigation (RI) began in the Fall of 2020 to determine the nature and extent of contamination at the approximately 107-acre plant property (OU1). The OU1 RI is scheduled to be completed in Winter 2024. Additional RIs for the east and west gypsum stacks and adjacent water bodies (Bayou Casotte and Grand Bay Estuary) are scheduled to begin by Winter of 2025. Concurrently, a Non-Time Critical Removal is being conducted to cap the large east gypsum stack (OU2) which is the source of significant surface water contamination. Primary contaminants are metals and acidity (pH) in surface water and groundwater. In addition to the RIs and removal work being conducted, the United States Bankruptcy Court approved the sale of the former 107-acre plant property to Seven Seas Terminals, LLC in July 2023. Seven Seas plans to demolish existing above ground infrastructure and redevelop the former DAP manufacturing plant area as a dry bulk storage and tank terminal operation. As a part of the Bona Fide Prospective Purchaser Agreement, Seven Seas will conduct a removal action to address contaminated soils within the plant property.