40 CFR § 415.360
Applicability; description of the copper salts production subcategory
June 9, 2020
The provisions of this subpart are applicable to discharges and to the introduction of pollutants into treatment works which are publicly owned resulting from the production of copper salts, including (a) copper sulfate, copper chloride, copper iodide, and copper nitrate, and (b) copper carbonate.