Arsenic Rule

Fact Sheet

• Quick Reference Guide
• Technical Fact Sheet: Final Rule for Arsenic in Drinking Water

FAQ

• What is the maximum contaminant level (MCL) and maximum contaminant level goal (MCLG) for arsenic?
  • The MCL for arsenic is 0.010 mg/L and the MCLG is 0.
• When and why did the MCL for arsenic change?
  • In 2001, the EPA adopted the lower 10 ppb standard for arsenic which was reduced from the previous level of 50 ppb. This reduction was based upon on scientific reviews, cost of compliance, and benefits analyses.
• What are the potential health effects from long term exposure over the MCL?
  • Skin damage or problems with circulatory systems, and may have increased risk of cancer.
• What are the possible sources of arsenic contamination in drinking water?
  • Erosion of natural deposits, runoff from agricultural or industrial activities.

Forms

• Arsenic Sample Information Sheet and Sampling Instructions

Publications

• Drinking Water Standard for Arsenic
• Arsenic Small Entity Compliance Guide
• Arsenic Treatment Technology Evaluation Handbook for Small Systems
• Evaluating Arsenic Treatment Providers: A Guide for Public Water Systems
• 12 Steps to Arsenic Compliance