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- 15 parts per millionSince 1991, the Environmental Protection Agency (EPA) has implemented a regulation mandating that the concentration of lead in all drinking water systems, including schools, hospitals, apartments, and homes, should not surpass an action level of 15 parts per million (ppm) for all taps tested.www.bestosmosisexperts.com/safe-levels-of-lead-in-water/
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