New Wales Water Loss Incident
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New Wales Water Loss Incident

This page will provide frequent updates on a sinkhole that formed in one compartment of Mosaic’s active gyp stack in New Wales. Questions may be directed to Callie Neslund at (863) 844-5327. The number to call for inquiries about testing or bottled water is (813) 500-6575 or you can email us at

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February 17, 2017 Report

New Recovery Well Installed

Mosaic Fertilizer completed the commissioning of a new recovery well, P4B substituting recovery well P4 as the primary recovery well. P4B is located immediately west of the sinkhole and is directly in line with groundwater flow in the Floridan aquifer. P4 will be available as a standby recovery well as needed.

February 14, 2017 Report

Installing Instrumentation in the Gypstack

As initial grouting continues, Mosaic Fertilizer completed installing additional instrumentation in the west compartment. We now have 13 new piezometers to measure water levels in the gypstack, which will also help direct our grouting work. Pictured below are two of the newly-installed piezometers located on top of the New Wales gypstack.

February 10, 2017 Report

Mosaic Fertilizer’s Response to Inaccurate Tampa Bay Times Article

The allegations in Mr. Pittman’s February 10 article titled “Mosaic, state should have seen sinkhole forming, experts say,” are fundamentally wrong. The water level increases cited in his article were observed in a location that is in no way related to the recent sinkhole at Mosaic Fertilizer’s New Wales facility.

The water level data are from Mosaic Fertilizer’s closed North gypstack, not its active stack to the south. They resulted from grouting operations of that stack and were expected and intended. Mosaic performed that work subject to FDEP’s oversight. Beyond that, the water level data were collected in the confining layer below the gypstack, not the Floridan aquifer. The Floridan aquifer monitoring performed during those grouting activities continued to show normal variations in water level, and that aquifer was unaffected by the grouting activities.

It is appalling that Mr. Pittman continues to provide a platform for false information. Responsible journalists check facts from multiple sources to get to the truth before they accuse a company of negligence. That did not happen here.

February 9, 2017 Report

Defining the Terms – Gypstack

This series will further explain some of the technical terms used in our remediation posts.

This post defines the term: gypstack, which we often use when referring to Mosaic Fertilizer’s manufacturing operations.

Phosphogypsum (primarily calcium sulfate) is a byproduct of the fertilizer manufacturing process that is created when the phosphate rock we mine is combined with sulfuric acid to form phosphoric acid and phosphogypsum. The term gypstack refers to a stack where phosphogypsum is stored.

Gypstacks are engineered features and are highly regulated. Federal regulations require phosphogypsum to be stored in stacks because of naturally occurring radionuclides in the mined phosphate rock. The Florida Department of Environmental Protection has developed stringent standards regarding the design, operation, maintenance, closure and long-term care of gypstacks.

February 3, 2017 Report

Progress at New Wales


Mosaic Fertilizer started the initial phase of grouting on Wednesday. Using holes drilled from the work pad into the upper cavity, we are injecting grout (concrete mix) to fill any voids that may be present ahead of the deeper high pressure grouting to plug the sinkhole.