by Sharon Lerner ProPublica is a nonprofit newsroom that investigates abuses of power. Sign up to receive our biggest stories as soon as they’re published. 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 social media post last month that said, “Without this assessment, federal and state agencies are denied the best available science that they rely on to protect public health.” PFNA is so hazardous that the EPA struck an agreement with eight companies to phase it out nearly two decades ago. The chemical was a component of firefighting foam and a processing aid to make a kind of plastic used in circuit boards, valves and pipes. PFNA has been found in water near sites where the foam was used and in the drinking water in 28 states, according to an analysis of EPA and state data by the nonprofit Environmental Working Group. Local governments around the country have been trying to get companies that used and made forever chemicals such as PFNA to foot the bill for the expensive job of cleaning up contamination. In 2019, the state of New Jersey ordered the owner of an industrial plant in West Deptford to address chemical contamination at the site, where high levels of PFNA had been found in the nearby soil and water. The state took the company, Solvay Specialty Polymers, to court, accusing it of failing to fully comply. As part of a legal settlement, Solvay agreed to pay more than $393 million and to clean up contamination. The company, which has since become Syensqo Specialty Polymers, pointed out to ProPublica other sources of PFNA contamination in the area of the plant and noted that it settled the suit without admission of liability. Solvay tried to influence the EPA over the drinking water limit the agency set for PFNA and other chemicals in the class, according to lobbying records. The company also lobbied Congress over legislation that would prevent chemical assessments conducted by the agency’s Integrated Risk Information System program from being used in regulation. IRIS, as the program is known, analyzes the harm chemicals can cause and put together the PFNA report. Syensqo and Solvay did not respond to questions about lobbying and whether they asked the EPA either to change or not release the IRIS report on PFNA. Scientists in the EPA’s IRIS program began work on the assessment because PFNA, short for perfluorononanoic acid, appeared particularly dangerous. Like other compounds in its class, PFNA doesn’t break down in nature. Scientists had already found it in soil and water around the country. It was also measured in food, air, indoor dust and fish — as well as in breastmilk, fetal tissues and human blood. Perhaps most worrisome, studies had already suggested that the chemical caused serious harm to people and lab animals. A draft of the report, which reflected five years of collecting and reviewing studies, found that, in addition to developmental, liver and reproductive harms, PFNA “may cause” immune problems, thyroid effects, harm to the developing brain and a cluster of other disorders, including Type 2 diabetes. The American Chemistry Council took issue with the report’s findings on low birth weight and liver issues, arguing that the evidence wasn’t as robust as the report claimed. The industry trade group did not address the reproductive threats posed by PFNA, which have been documented by other regulatory agencies and are part of a larger