Political officials at EPA have overruled the agency’s career scientists to weaken a major health assessment for a toxic chemical contaminating the drinking water of an estimated 860,000 Americans, according to four sources with knowledge of the changes.

The changes to the safety assessment for the chemical PFBS, part of a class of “forever chemicals” called PFAS, is the latest example of the Trump administration’s tailoring of science to align with its political agenda, and another in a series of eleventh-hour steps the administration has taken to hamstring President-elect Joe Biden’s ability to support aggressive environmental regulations.

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