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Riverview East Stack Extension

PERMITTING DASHBOARD PROJECT POSTING DATE: JULY 22, 2025

All dates below are specific to the schedule of the Environmental Review and Permitting processes for this project.

Planned

ENVIRONMENTAL REVIEW AND PERMITTING STATUS
PLANNED

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ESTIMATED COMPLETION DATE OF ENVIRONMENTAL REVIEW AND PERMITTING
PENDING

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ENVIRONMENTAL REVIEW AND PERMITTING PROCESSES
COMPLETED

Manufacturing

SECTOR
Manufacturing

Project Category

CATEGORY
Project Category FAST-41 Covered Projects

Department of the Army

LEAD AGENCY
Department of the Army, US Army Corps of Engineers - Regulatory

Description:

Mosaic Fertilizer, LLC (Mosaic) owns and operates the Riverview Fertilizer Manufacturing Plant in Hillsborough County, Florida. Mosaic processes phosphate ore to manufacture sulfuric acid, phosphoric acid, fluorosilicic acid, and ammoniated phosphate fertilizer products.

Manufacturing produces phosphogypsum, a solid waste material that must be stored in an engineered feature known as phophogypsum stack, or “gypstack”. The manufacturing facility has two phosphogypsum storage stacks (the now closed West Stack and the currently operating East Stack). The purpose of the project is to extend the East Stack to provide the storage capacity needed to maintain current production levels until the end of life of the manufacturing plant.