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Why was the MCL lowered from 50 ppb to 10 ppb?

lowered MCL ppb
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Why was the MCL lowered from 50 ppb to 10 ppb?

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A. The California Department of Health and Federal EPA lowered the MCL for Arsenic from 50 ppb to 10 ppb based on research indicating that ingestion of Arsenic at levels equal to or above 10 ppb increased the risk of bladder and lung cancer.

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