Notice of Intent To Re-Evaluate the Aquatic Life Ambient Water Quality Criteria for Ammonia

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Section 304(a) of the Clean Water Act (CWA) authorizes the U.S. Environmental Protection Agency (EPA) to develop and publish, and from time to time revise, criteria recommendations for water accurately reflecting the latest scientific knowledge. Today, EPA is notifying the public of its intent to re-evaluate the current aquatic life criteria for ammonia to determine if a revision is warranted based on new toxicity data for aquatic organisms. EPA is also soliciting any additional pertinent toxicity data or information that may be useful in re-evaluating these criteria.