Draft EPA Document is Accepting Public Comments

EPA published a draft document, Field-Based Methods for Developing Aquatic Life Criteria for Specific Conductivity. Elevated water salinity, as measured by conductivity, has been shown to negatively affect aquatic life in freshwaters. Elevated conductivity is associated with multiple sources, including discharge from wastewater treatment facilities, surface mining, oil and gas exploration, runoff from urban areas, and discharge of agricultural irrigation return waters.

The draft methods provide flexible approaches for developing science-based conductivity criteria for flowing waters that reflect ecoregional- or state-specific factors. Once final, states and authorized tribes located in any region of the country may use the methods to develop field-based conductivity criteria for flowing waters. This draft document provides a scientific assessment of ecological effects and is not a regulation. EPA is accepting public comments for 60 days on the draft document.

The draft document and supporting materials can be accessed here: https://www.epa.gov/wqc/draft-field-based-methods-developing-aquatic-life-criteria-specific-conductivity

For more information please contact Colleen Flaherty at flaherty.colleen@epa.gov or 202-564-5939.