National Primary Drinking Water Regulations; Arsenic and Clarifications to Compliance and New Source Contaminants Monitoring: Delay of Effective Date

In accordance with the memorandum of January 20, 2001, from the Assistant to the President and Chief of Staff, entitled "Regulatory Review Plan," published in the Federal Register on January 24, 2001, this action temporarily delays for 60 days the effective date of the rule entitled National Primary Drinking Water Regulations; Arsenic and Clarifications to Compliance and New Source Contaminants Monitoring, published in the Federal Register on January 22, 2001, 66 FR 6976. That rule establishes a health-based, non- enforceable Maximum Contaminant Level Goal for arsenic of zero and an enforceable Maximum Contaminant Level for arsenic of 0.01 mg/L (10 ug/ L) for public water systems. In addition, it clarifies monitoring and demonstration of compliance for new systems or sources of drinking water. It also clarifies compliance for State-determined monitoring after exceedances for inorganic, volatile organic, and synthetic organic contaminants. Finally, it recognizes the State-specified time period and sampling frequency for new public water systems and systems using a new source of water to demonstrate compliance with drinking water regulations.