The EPA action level – 15 parts per billion of lead in the water – is not a threshold for public health, so a reading below that number doesn't mean the water is safe.
Public officials and school administrators often reference that level to assuage fears about lead in the water. But Jeff Cohen, who was on the EPA team that decided on that number, said linking it to a threshold for public health is a "misunderstanding." "The goal of the rule is zero lead in drinking water," he said.
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