Mosaic told The Lens that the company has not decided to do so — even as the EPA cast doubt on the company’s model used to determine the stability of the reservoir itself.

Slight lateral movement continued to be reported along the north perimeter, crest and slope of Mosaic Fertilizer’s Gypsum Stack No. 4, which holds back hundreds of millions of gallons of wastewater. But the company says the overall rate of movement has slowed substantially.

Representatives of Mosaic Fertilizer say they are confident about their ability to prevent a potential breach of its gypsum-walled reservoir in St. James Parish. Even so, Mosaic is taking steps to secure the reservoir to ensure that any potential leak of acidic wastewater does not escape from their property

EPA, LDEQ and even the Justice Department are monitoring efforts by Mosaic Fertilizer to prevent a potential release of acidic wastewater into nearby wetlands. There’s little chance of a release into the Mississippi River. But local residents draw little relief from the company’s assurances.