CFR › Title 40 › Part 421 › §421.20440 CFR §421.204Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkAny new source subject to this subpart shall achieve the following new source performance standards:(a)Spent battery electrolyte.(b)Acid wash and rinse water.(c)Furnace wet air pollution control.