CFR › Title 40 › Part 421 › §421.24440 CFR §421.244Verified 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)Slag reclaim tailings.(b)Acid reclaim leaching filtrate.(c)Acid reclaim leaching belt filter backwash.