Wisconsin Administrative Code
Department of Natural Resources
NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System
Chapter NR 256 - Metal molding and casting
Subchapter III - Ferrous Casting Subcategory
Section NR 256.30 - Applicability; description of the ferrous casting subcategory
Current through August 26, 2024
(1) This subchapter applies to discharges to waters of the state and to introduction of pollutants into publicly owned treatment works from ferrous casting operations. It applies to a production process if the molten metal contains, on average, greater than 50% by weight of ferrous metal or if ferrous metal comprises the greatest percentage of the metal, measured by weight.
(2) Ancillary scrubber operations, such as fan washes and backwashes, are covered by the mass limitations of the associated discrete wet scrubbing device. Water discharges from aftercooling devices are not regulated as a process wastewater in this subcategory.
(3) Processing operations following the cooling of castings, except for grinding scrubber operations, may be regulated by the electroplating point source category under ch. NR 260, or metal finishing point source category under ch. NR 261.
