Section NR 274.063 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable(1) Except as provided in 40 CFR 125.30 to 125.32 and sub. (2), any existing point source subject to this subchapter may not discharge process wastewater pollutants into waters of the state.(2) A process wastewater impoundment which is designed, constructed and operated to contain the precipitation from the 25-year, 24-hour rainfall event as established for the impoundment's location by the national climatic center, national oceanic and atmospheric administration, may discharge a volume of process wastewater equivalent to the volume of precipitation which falls within the impoundment in excess of the precipitation attributable to the 25-year, 24-hour rainfall event, when such an event occurs.Wis. Admin. Code Department of Natural Resources § NR 274.063
Cr. Register, March, 1991, No. 423, eff. 4-1-91.