Florida Tested Phosphogypsum in Private Road Construction
Construction operators should note how regulatory approvals for alternative road base materials are evolving in Florida.
Updated on Oct. 10, 2026 in Construction
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On December 23, 2024, the EPA approved a test project in New Wales, Florida, using phosphogypsum as a base material for a private road. The project evaluates whether this byproduct of phosphoric acid production can be safely contained beneath asphalt.
Why it matters
The EPA permitted this project based on a finding that the road provides human health protection equivalent to engineered storage stacks, despite phosphogypsum containing radium that produces radioactive radon gas. This establishes a regulatory precedent for utilizing industrial waste in heavy infrastructure projects.
The test road configuration includes 4 sections incorporating phosphogypsum against 4 control sections, with each section monitored by 1 upgradient and 2 downgradient wells. The total impact on future material sourcing remains unknown.
The players
Mosaic Fertilizer, LLC
A major phosphate fertilizer producer that manages industrial byproducts and large-scale manufacturing operations.
Environmental Protection Agency
The federal agency responsible for setting environmental standards and overseeing the management of hazardous radionuclides under the Clean Air Act.
The details
Phosphogypsum, a byproduct of processing phosphate ore, is integrated into the road base and subsequently sealed with an asphalt layer. To track potential environmental impacts, engineers installed one upgradient monitoring well and two downgradient wells in each of the eight test and control sections. This system is designed to assess if the material poses risks to the surrounding soil and water through radon gas emissions or leaching.
Timeline
December 23, 2024: The EPA officially approved the phosphogypsum road construction project.
Market Landscape
The project operates within the strict parameters of the Clean Air Act, which classifies phosphogypsum as a source category of radionuclides. It marks a departure from standard storage protocols by exploring direct infrastructure applications for industrial waste products.
Operators in the infrastructure sector should monitor this project for potential changes in permitted raw materials for road bases. While this is a private test, successful results could signal future shifts in sourcing requirements and disposal compliance for phosphate-related byproducts.
The takeaway
This test highlights how industrial byproducts are increasingly scrutinized for secondary utility in heavy construction. Business owners should track the long-term data from these monitoring wells to understand whether similar materials may eventually become viable, cost-effective options in commercial paving projects.
Further reading
For more on industry shifts, visit the Construction section.
Source note: This article includes information reported by The Times of India.
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