In Flint, Michigan, as many as 8,000 children under age 6 were exposed to unsafe levels of lead. But it is hardly the only such occurrence. Unsafe levels of lead have turned up in tap water in city after city — in North Carolina, South Carolina, and Mississippi — as well as in scores of other places in recent years. Such episodes are unsettling reminders of what experts say are holes in the safety net of rules and procedures intended to keep water not just lead-free, but free of all poisons.
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