Revised Freshwater Criteria for Copper

Revised Freshwater Criteria for Copper

In a February 22 Federal Register Notice, EPA announced the availability of the revised national recommended freshwater aquatic life criteria for copper. Since EPA published the hardness-based recommendation for copper criteria in 1984, new data have become available on copper toxicity and its effects on aquatic life. The Biotic Ligand Model (BLM) – a metal bioavailability model that uses receiving water body characteristics to develop site-specific water quality criteria – incorporates the best available science and serves as the basis for the new national recommended criteria.

For more information about the criteria, visit EPA's web site at

source: Water Headlines for March 1, 2007
Benjamin H. Grumbles, Assistant Administrator
Office of Water

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