Lead pipes could no longer be used in plumbing systems constructed in the United States after _____________________.
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Q10: _ is believed to have been the
Q11: _ in water indicates the presence of
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Q14: Problems in the water supply for Flint,
Q15: The _ is a partly voluntary program
Q16: Discharges from industrial sources are the second
Q17: Until the early 1970s, the federal government
Q18: The Safe Drinking Water Act requires pre-treatment
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