States Raise Implementation Concerns Over Draft EPA Selenium Criteria

States are calling for clarity on how to implement EPA's draft water quality criteria for selenium that relies partially on fish-tissue concentrations for assessing adverse effects to aquatic life, suggesting that monitoring costs could strain already tight state budgets, even as two states are pursuing studies that could address some of the concerns. Many states generally support EPA's efforts to set values for selenium based on levels of the pollutant in fish tissues, rather than the water column, because it...