Proposed revisions to state surface water quality standards, including the numbers the state uses to evaluate metals, have been approved by the N.C. Environmental Management Commission in response to the federally-required Triennial Review of Surface Water Quality Standards. Also included in approval of the recommendations made during this standards review are:
•Health protective water quality standards for 2,4-D, a widely used herbicide.
•Updated aquatic life protective concentrations for arsenic, beryllium, cadmium, chromium III, chromium VI, copper, lead, nickel, silver and zinc.
•Clarity on allowing site-specific standards to be developed when studies are done in accordance with guidance from the Environmental Protection Agency.