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That was the case in Washington, where 40,000 water service lines
were replaced after the District of Columbia Water and Sewer Authority
found drinking water lead above the action level of 15 parts per billion
in 73% of the 4,613 homes tested. In other words, an action level of 15 parts per billion
doesn't mean that water with 14 ppb or 13 ppb of lead is safe. The plot develops smoothly to a
credible conclusion with a consistently high action level all the way. |
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