Arsenic and Clarifications to Compliance and New Source Monitoring Rule

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.

EPA’s Quick Reference Guide for Arsenic and Clarification to Compliance and New Source Monitoring Rule (PDF)