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ACC Biocides Panel Copper Task Force comments on EPA's Draft Aquatic Life Ambient Estuarine/Marine Water Quality Criteria for Copper-2016
EPA is updating its national recommended ambient water quality criteria for copper in estuarine/marine environments in order to reflect the latest scientific information, and current EPA policies and methods. EPA's water quality criteria provides recommendations to states and tribes authorized to establish water quality standards under the Clean Water Act. In adopting water quality standards, states set exposure protections for aquatic life; acute exposure to copper can result in mortality, while chronic exposure to copper can negatively impact factors including the growth, development, and reproduction of aquatic life in estuarine/marine systems. The draft criteria incorporates use of the saltwater biotic ligand model (BLM), a bioavailability model that relies on water quality input parameters to estimate copper criteria that is protective of aquatic life in estuarine/marine environments, and an updated toxicity database. Incorporation of the BLM allows users to account for individual water quality variables (temperature, pH, dissolved organic carbon, and salinity) that influence the bioavailability and toxicity of copper in estuarine/marine environments.
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