It’s long been known that, in certain concentrations, the compounds could be dangerous if they got into water or if people breathed dust or ate food that contained them. Tests showed they accumulated in the blood of chemical factory workers and residents living nearby, and studies linked some of the chemicals to cancers and birth defects.

Now two new analyses of drinking water data and the science used to analyze it make clear the Environmental Protection Agency and the Department of Defense have downplayed the public threat posed by these chemicals. Far more people have likely been exposed to dangerous levels of them than has previously been reported because contamination from them is more widespread than has ever been officially acknowledged.

Moreover, ProPublica has found, the government’s understatement of the threat appears to be no accident.

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