‘Wall of Water’ if Piney Point Reservoir in Florida Breaches, Officials Warn

The Four Percent

The authorities in Florida said on Sunday that they were making progress in their efforts to drain a leaking reservoir holding more than 300 million gallons of wastewater but warned that were it to breach, it could result in a 20-foot wall of water.

“What we’re looking at now is trying to prevent and respond to, if need be, a real catastrophic flood situation,” Gov. Ron DeSantis said at a news conference on Sunday morning.

The governor issued an executive order on Saturday declaring a state of emergency for three counties that could be affected by the leaking 79-acre reservoir.

Controlled releases from the reservoir to reduce the chances of a full-fledged breach started on Friday, officials said, resulting in an average of 35 million gallons a day being siphoned.

On March 26, when the initial leak was reported, the reservoir held about 480 million gallons of water. Before officials started to pump water to reduce the threat of a breach, the reservoir was leaking at a rate of two million to three million gallons per day but conditions deteriorated in recent days, officials said.

Officials said the primary concern about the discharged water was the concentration of nitrogen and phosphorus but emphasized that the water was not radioactive.

A sudden, uncontrolled breach could upend stacks of phosphogypsum, a waste product of phosphate mining, that hold the ponds. Phosphogypsum contains “appreciable quantities” of radioactive materials, like uranium and radium, according to the federal Environmental Protection Agency.

“If there were to be a full breach, a section of the gypsum stack would be part of that breach,” Mr. Hopes said.

Florida is the world’s largest phosphate-producing area, according to the E.P.A., and accounts for approximately 80 percent of the national phosphate mining activity. The United States each year mines and consumes about 23 million tons of phosphate, which is mined mostly for use in fertilizers.

The phosphogypsum created in the mining process is “transferred as a slurry” to the stacks, where the slurry solidifies and water pools on the surface of the stack, according to the E.P.A. Gypsum is dredged to build up the sides of the stack, which is then used to hold the wastewater from the mining process.

The authorities said there were no public water supply wells in the evacuation zone. Ms. Baugh said that water customers in Manatee County “can rest assured that their drinking water is completely safe to drink,” and that people who rely on well water “also at this point have no need for concern.”

“If a breach occurs,” Ms. Baugh added, “we believe that the surface layers of dirt and earth will safely filter any harmful nutrients near the surface.”

The Florida Department of Health would issue water quality advisories if necessary, she said.

Mr. Hopes said it was unlikely that officials would seek to repair a liner in the leaking reservoir. He suggested instead that efforts would be made to deplete the holding ponds and then move to a permanent solution, like filling and capping them.

Bryan Pietsch contributed reporting.

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