StacksVerified U.S. regulatory reference

40 CFR §464.21

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
For the purpose of this subpart:
  1. (a)Total Toxic Organics (TTO). TTO is a regulated parameter under PSES (§ 464.25) and PSNS (§ 464.26) for the copper subcategory and is comprised of a discrete list of toxic organic pollutants for each process segment where it is regulated, as follows:
    1. (1)Casting Quench (§§ 464.25(a) and 464.26(a)):
    2. (2)Dust Collection Scrubbers (§ 464.25(c) and 464.26(c)):
    3. (3)Investment Casting (§ 464.25(e) and § 464.26(e)):
    4. (4)Melting Furnace Scrubber (§ 464.25(f) and § 464.26(f)):
    5. (5)Mold Cooling (§ 464.25(g) and § 464.26(g)):