Mosaic reports limited damage from spill into Tampa Bay during Hurricane Milton
The phosphate mining company had halted operations across Florida to prevent potential damage from Milton.
More than 15 inches of unrelenting rain from Hurricane Milton has caused a spill at Mosaic's Riverview processing plant.
As a result, an unknown amount of wastewater flowed into Tampa Bay.
Company officials said "the volume may have been greater than the 17,500-gallon reporting standard."
A company statement said a water collection system at its phosphate gypstack became overwhelmed by the rain, causing it to flow out of a manhole.
"At this time, we believe some of that impacted stormwater made its way to an outfall which discharges into Tampa Bay. The issue was addressed yesterday (Sunday) and is not continuing. We expect water quality impacts, if any, to be modest."
State environmental regulators were on the site Monday.
The gypstack is not active and holds slightly radioactive byproducts of phosphate fertilizer production.
Last week, the company halted all its operations in Florida ahead of Milton. It says power has been restored to all of its facilities.