Tampa Neighbors Worry Over Growing Riverview Waste Stack
For decades, Hillsborough County families in Progress Village have lived in the shadow of the massive Riverview phosphogypsum stack. As fertilizer giant Mosaic continues to manage and expand this towering mountain of industrial byproduct, local residents are raising urgent alarms about their health and safety. This growing environmental challenge hits close to home for the Tampa Bay area, highlighting the ongoing tension between heavy industry and community well-being.
The Growing Mountain in Tampa’s Backyard
The Riverview facility, operated by Mosaic, processes phosphate ore to produce agricultural fertilizer. A major byproduct of this process is phosphogypsum, a chalky substance that contains low levels of naturally occurring uranium, thorium, and radium-226. Because federal regulations prohibit using this material in most construction projects due to its radioactivity, it must be stored indefinitely in massive, outdoor mounds known as gypstacks.
Over the years, the Riverview stack has grown into a dominant feature of the local landscape. Rising hundreds of feet above the surrounding terrain, the stack is topped with large ponds of highly acidic wastewater. For residents of Progress Village—a historic, predominantly Black community founded in the 1950s—the physical growth of this stack represents an escalating threat to their environment, home values, and peace of mind.
Key Concerns for Progress Village Residents
Air Quality and Windblown Dust
On dry, windy days, residents report seeing white dust blowing off the uncovered slopes of the gypstack. Because phosphogypsum contains radium-226, which decays into cancer-causing radon gas, neighbors worry about long-term inhalation risks in their backyards. Community advocates emphasize that local children and elderly residents suffer from disproportionately high rates of respiratory issues like asthma, though direct environmental health studies for the immediate neighborhood remain limited.
Water Security and Aquifer Protection
Tampa Bay relies heavily on underground aquifers for its public drinking water. Phosphogypsum stacks sit directly atop these vulnerable, porous limestone formations. If a sinkhole opens beneath a stack—a disaster that has occurred multiple times in Central Florida’s history—millions of gallons of highly acidic, nutrient-rich water could drain directly into the aquifer. The fear of a catastrophic spill, similar to the recent Piney Point disaster in neighboring Manatee County, keeps local homeowners on high alert.
Comparing Waste Management in Hillsborough County
To understand the unique challenge of the Riverview stack, it is helpful to contrast how phosphogypsum is stored compared to standard municipal waste.
| Feature | Phosphogypsum Stack | Standard Municipal Landfill |
|---|---|---|
| Primary Material | Phosphogypsum and highly acidic process water | Household waste, plastics, and organic matter |
| Radioactive Hazards | Yes; contains radium-226 and releases radon gas | No; strictly non-hazardous materials |
| Storage Method | Indefinite above-ground mounding with open water ponds | Below-ground cells with protective daily soil capping |
Environmental Justice and What to Watch Next
Progress Village residents point to their situation as a classic, systemic case of environmental injustice. Historically, industrial plants, waste facilities, and heavy trucking routes in Hillsborough County have been disproportionately placed near minority and lower-income neighborhoods. This concentration of industrial hazards compounds local worries, leaving residents feeling as though their health is treated as secondary to corporate profits. Local advocates are demanding more transparent monitoring, independent third-party air quality testing, and a permanent seat at the table during county zoning and regulatory planning discussions.
Moving forward, Hillsborough County residents should keep a close eye on public notices regarding Mosaic’s state permit renewals and any proposed expansion requests for the Riverview facility. Environmental groups like the Sierra Club and local watershed protection watchdogs are actively tracking these developments and organizing community town halls to educate neighbors. Public pressure, community testimony, and active participation in local government meetings will play a crucial role in determining whether state regulators enforce stricter containment and monitoring protocols on this growing waste stack.
Frequently Asked Questions
- What is a phosphogypsum stack?
It is a massive mound of solid byproduct generated during the production of phosphoric acid for fertilizer, topped with a pond of acidic wastewater. - Is the Riverview waste stack radioactive?
Yes, phosphogypsum contains trace amounts of naturally occurring radium, uranium, and thorium, which emit low-level radiation and release radon gas. - How does the stack impact Progress Village?
Residents face potential risks from windblown radioactive dust, radon gas exposure, and groundwater contamination from potential spills or sinkholes. - Who regulates these waste sites in Florida?
The Florida Department of Environmental Protection (DEP) and the federal Environmental Protection Agency (EPA) oversee permit compliance and safety standards.
To protect your home and family, stay informed by attending Hillsborough County Commission meetings, signing up for local environmental group newsletters, and monitoring public notices regarding Mosaic’s operating permits to ensure your community’s voice is heard.
Tampa Neighbors Worry Over Growing Riverview Waste Stack
