StacksVerified U.S. regulatory reference

40 CFR §421.50

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The provisions of this subpart apply to process wastewater discharges resulting from the electrolytic refining of primary copper, including, but not limited to, anode casting performed at refineries which are not located on-site with a smelter, product casting, and by-product recovery.