---identifier: "/us/cfr/t40/s464.41"source: "ecfr"legal_status: "authoritative_unofficial"title: "40 CFR § 464.41 - Specialized definitions."title_number: 40title_name: "Protection of Environment"section_number: "464.41"section_name: "Specialized definitions."chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"subchapter_number: "N"subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"part_number: "464"part_name: "METAL MOLDING AND CASTING POINT SOURCE CATEGORY"positive_law: falsecurrency: "2026-03-24"last_updated: "2026-03-24"format_version: "1.1.0"generator: "[email protected]"authority: "Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307, 308, and 501 of the Clean Water Act (Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e) and (g), 1316 (b) and (c), 1317 (b) and (c), 1318, and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217."regulatory_source: "50 FR 45247, Oct. 30, 1985, unless otherwise noted."cfr_part: "464"---
Identifier
/us/cfr/t40/s464.41
Currency
2026-03-24
Positive Law
No
Updated
2026-03-24
Chapter
Environmental Protection Agency
Authority
Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307, 308, and 501 of the Clean Water Act (Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) (th... Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307, 308, and 501 of the Clean Water Act (Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e) and (g), 1316 (b) and (c), 1317 (b) and (c), 1318, and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217.
# 464.41 Specialized definitions.For the purpose of this subpart:(a) *Total Toxic Organics* (TTO). TTO is a regulated parameter under PSES (§ 464.45) and PSNS (§ 464.46) for the zinc subcategory and is comprised of a discrete list of toxic organic pollutants for each process segment where it is regulated, as follows:(1) Casting Quench (§§ 464.45(a) and 464.46(a)):21. 2,4,6-trichlorophenol22. para-chloro meta-cresol31. 2,4-dichlorophenol34. 2,4-dimethylphenol39. fluoranthene44. methylene chloride (dichloromethane)65. phenol66. bis(2-ethylhexyl) phthalate68. di-n-butyl phthalate70. diethyl phthalate85. tetrachloroethylene(2) Die Casting (§§ 465.45(b) and 464.46(b)):1. acenaphthene21. 2,4,6-trichlorophenol22. para-chloro meta-cresol24. 2-chlorophenol34. 2,4-dimethylphenol44. methylene chloride (dichloromethane)55. naphthalene65. phenol66. bis (2-ethylhexyl) phthalate68. di-n-butyl phthalate70. diethyl phthalate85. tetrachloroethylene86. toluene87. trichloroethylene(3) Melting Furnace Scrubber (§§ 464.45(c) and 464.46(c)):31. 2,4-dichlorophenol34. 2,4-dimethylphenol39. fluoranthene44. methylene chloride (dichloromethane)55. naphthalene65. phenol66. bis(2-ethylhexyl) phthalate68. di-n-butyl phthalate85. tetrachloroethylene86. toluene87. trichloroethylene(4) Mold Cooling (§§ 464.45(d) and 464.46(d)):21. 2,4,6-trichlorophenol22. para-chloro meta-cresol31. 2,4-dichlorophenol34. 2,4-dimethylphenol39. fluoranthene44. methylene chloride (dichloromethane)65. phenol66. bis(2-ethylhexyl) phthalate68. di-n-butyl phthalate70. diethyl phthalate85. tetrachloroethylene[50 FR 45247, Oct. 30, 1985; 51 FR 21762, June 16, 1986]