EPA is promulgating technology-based effluent limitations guidelines (ELGs) and new source performance standards (NSPS) under the Clean Water Act (CWA) for discharges from airport deicing operations. The requirements generally apply to wastewater associated with the deicing of airfield pavement at primary airports. The rule requires all such airports to comply with requirements based on substitution of less toxic pavement deicers that do not contain urea. The rule also establishes NSPS for wastewater discharges associated with aircraft deicing for a subset of new airports. These airports must also meet requirements based on collection of deicing fluid and treatment of the collected fluid. The ELGs and NSPS will be incorporated into National Pollutant Discharge Elimination System (NPDES) permits issued by the permitting authority. EPA expects compliance with this regulation to reduce the discharge of deicing-related pollutants by 16 million pounds per year. EPA estimates the annual cost of the rule at $3.5 million.