The rule was published in the Federal Register (66FR 6976) on January 22, 2001 and became effective on February 22, 2002. This rule changed the arsenic MCL from 50 ug/L to 10 ug/L, and it set the MCLG to 0 ug/L. The rule was published in the Federal Register (66FR 6976) on January 22, 2001 and became effective on February 22, 2002.
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