by Sharon Lerner

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This spring, scientists at the Environmental Protection Agency completed a report on the toxicity of a “forever chemical” called PFNA, which is in the drinking water systems serving some 26 million people. The assessment found that PFNA interferes with human development by causing lower birth weights and, based on animal evidence, likely causes damage to the liver and to male reproductive systems, including reductions in testosterone levels, sperm production and the size of reproductive organs.

The report also calculated the amount of PFNA that people could be exposed to without being harmed — a critical measurement that can be used to set limits for cleaning up PFNA contamination in Superfund sites and for removing the chemical from drinking water.

For months, however, the report has sat in limbo, raising concerns among some scientists and environmentalists that the Trump administration might change it or not release it at all.

The EPA told ProPublica the report would be published when it was finalized, though the press office did not answer questions about what still needed to be done or when that would likely happen.

But the report’s final version was “completed and ready to post” in mid-April, according to an internal document reviewed by ProPublica. And two scientists familiar with the assessment confirmed the report has been finalized and ready for publication since April.

“Scientifically, it was done,” said one of the two scientists, who both worked in the EPA’s Office of Research and Development and who spoke on condition of anonymity because they were not authorized to talk publicly about the unreleased report.

“All that was left to do was to brief higher-ups about the report and post it,” the scientist said, adding that such a delay was unusual. “In recent years, the assessments tended to be finalized within a few weeks.”

A draft version of the assessment was made public last year and drew objections from an industry trade group. The final version, which retained the calculations published in the draft report, was completed shortly before the EPA announced its intention in May to rescind and reconsider limits on the amount of PFNA and several other forever chemicals allowed in drinking water. The limits had been set last year by President Joe Biden’s administration.

Darya Minovi, a senior analyst at the Union of Concerned Scientists, pointed to that pending change as a possible motivation for not publishing the PFNA assessment. “If you’re trying to roll back drinking water standards, you probably don’t want to release information that makes the case for why those standards are necessary,” said Minovi.

The nonprofit science advocacy group called attention to the unpublished report in a

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