A family of chemicals — known as PFAS and responsible for marvels like Teflon and critical to the safety of American military bases — has now emerged as a far greater menace than previously disclosed.
The chemicals once seemed near magical, able to repel water, oil and stains.
By the 1970s, DuPont and 3M had used them to develop Teflon and
Scotchgard, and they slipped into an array of everyday products, from
gum wrappers to sofas to frying pans to carpets. Known as perfluoroalkyl
substances, or PFAS, they were a boon to the military, too, which used
them in foam that snuffed out explosive oil and fuel fires.
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.
The EPA and the Department of Defense calibrated water tests to
exclude some harmful levels of contamination and only register
especially high concentrations of chemicals, according to the vice
president of one testing company. Several prominent scientists told
ProPublica the DOD chose to use tests that would identify only a handful
of chemicals rather than more advanced tests that the agencies’ own
scientists had helped develop which could potentially identify the
presence of hundreds of additional compounds.
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Source: ProPublica
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