Regulations last checked for updates: May 01, 2025

Title 40 - Protection of Environment last revised: Nov 01, 2025
All TitlesTitle 40Chapter IPart 467Subpart D - Subpart D—Forging Subcategory
Collapse to view only § 467.46 - Pretreatment standards for new sources.
Table of Contents

§ 467.40 - Applicability; description of the forging subcategory.

§ 467.41 - Specialized definitions.

§ 467.42 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. [Reserved]

§ 467.43 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. [Reserved]

§ 467.44 - New source performance standards.

§ 467.45 - Pretreatment standards for existing sources.

§ 467.46 - Pretreatment standards for new sources.

§ 467.47 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional pollutant control technology. [Reserved]

§ 467.40 - Applicability; description of the forging subcategory.

This subpart applies to discharges of pollutants to waters of the United States and introductions of pollutants into publicly owned treatment works from the core of the forging subcategory and the ancillary operations.

§ 467.41 - Specialized definitions.

For the purpose of this subpart:

(a) The “core” of the forging subcategory shall include forging, artificial aging, annealing, degreasing, and sawing.

(b) The term “ancillary operation” shall mean any operation not previously included in the core, performed on-site, following or preceding the forging operation. The ancillary operations shall include forging air pollution scrubbers, solution heat treatment, and cleaning or etching.

§ 467.42 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. [Reserved]
§ 467.43 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. [Reserved]
§ 467.44 - New source performance standards.

Any new source subject to this subpart must achieve the following performance standards. The discharge of wastewater pollutants from the core shall not exceed the values set forth below:

Subpart D Core
Pollutant or pollutant property NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum forged
Chromium0.0190.008
Cyanide0.0100.004
Zinc0.0510.021
Aluminum0.3050.135
Oil and grease0.500.50
Suspended solids0.750.60
pH( 1)( 1)

1 Within the range of 7.0 to 10 at all times.

Subpart D Forging Scrubber Liquor
Pollutant or pollutant property NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum forged
Chromium0.0350.014
Cyanide0.0190.008
Zinc0.0960.04
Aluminum0.5760.256
Oil and grease0.9430.95
Suspended solids1.421.13
pH( 1)( 1)

1 Within the range of 7.0 to 10 at all times.

Subpart D Solution Heat Treatment Contact Cooling Water
Pollutant or pollutant property NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum quenched
Chromium0.760.31
Cyanide0.410.163
Zinc2.080.86
Aluminum12.455.52
Oil and grease20.3720.37
Suspended solids30.5624.45
pH( 1)( 1)

1 Within the range of 7.0 to 10 at all times.

Subpart D Cleaning or Etching Bath
Pollutant or pollutant property NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.0660.027
Cyanide0.0360.015
Zinc0.1830.075
Aluminum1.0940.485
Oil and grease1.791.79
Suspended solids2.692.15
pH( 1)( 1)

1 Within the range of 7.0 to 10 at all times.

Subpart D Cleaning or Etching Rinse
Pollutant or pollutant property NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.520.21
Cyanide0.280.11
Zinc1.420.59
Aluminum8.53.77
Oil and grease13.9113.91
Suspended solids20.8716.69
pH( 1)( 1)

1 Within the range of 7.0 to 10 at all times.

Subpart D Cleaning or Etching Scrubber Liquor
Pollutant or pollutant property NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.720.29
Cyanide0.390.155
Zinc1.970.812
Aluminum11.815.24
Oil and grease19.3319.33
Suspended solids29.0023.20
pH( 1)( 1)

1 Within the range of 7.0 to 10 at all times.

[48 FR 49149, Oct. 24, 1983; 49 FR 11633, 11635, Mar. 27, 1984]
§ 467.45 - Pretreatment standards for existing sources.

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduced pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in aluminum forming process wastewater introduced into a POTW shall not exceed the values set forth below:

Subpart D Core
Pollutant or pollutant property PSES
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum forged
Chromium0.0220.009
Cyanide0.0150.006
Zinc0.0730.031
TTO0.035
Oil and grease (alternate monitoring parameter)2.61.3
Subpart D Forging Scrubber Liquor
Pollutant or pollutant property PSES
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum forged
Chromium0.0420.017
Cyanide0.0280.011
Zinc0.140.058
TTO0.065
Oil and grease (alternate monitoring parameter)4.92.5
Subpart D Solution Heat Treatment Contact Cooling Water
Pollutant or pollutant property PSES
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum quenched
Chromium0.8970.37
Cyanide0.5910.25
Zinc2.981.24
TTO1.41
Oil and grease (alternate monitoring parameter)11053
Subpart D Cleaning or Etching Bath
Pollutant or pollutant property PSES
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.0790.032
Cyanide0.0520.022
Zinc0.260.11
TTO0.123
Oil and grease (alternate monitoring parameter)9.34.7
Subpart D Cleaning or Etching Rinse
Pollutant or pollutant property PSES
Maximum for any 1 day Maximum for monthly average
mb/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium1.70.7
Cyanide1.20.5
Zinc5.72.4
TTO2.7
Oil and grease (alternate monitoring parameter)200100
Subpart D Cleaning or Etching Scrubber Liquor
Pollutant or pollutant property PSES
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.8510.35
Cyanide0.5610.23
Zinc2.821.18
TTO1.34
Oil and grease (alternate monitoring parameter)10050
[48 FR 49149, Oct. 24, 1983; 49 FR 11632, 11633, 11635, Mar. 27, 1984, as amended at 53 FR 52369, Dec. 27, 1988]
§ 467.46 - Pretreatment standards for new sources.

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources. The mass of wastewater pollutants in aluminum forming process wastewater introduced into a POTW shall not exceed the values set forth below:

Subpart D Core
Pollutant or pollutant property PSNS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum forged
Chromium0.0190.008
Cyanide0.0100.004
Zinc0.0510.021
TTO0.035
Oil and grease (alternate monitoring parameter)0.500.50
Subpart D Forging Scrubber Liquor
Pollutant or pollutant property PSNS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum forged
Chromium0.0350.014
Cyanide0.0190.008
Zinc0.0960.040
TTO0.065
Oil and grease (alternate monitoring parameter)0.950.95
Subpart D Solution Heat Treatment Contact Cooling Water
Pollutant or pollutant property PSNS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum quenched
Chromium0.760.31
Cyanide0.410.16
Zinc2.080.86
TTO1.41
Oil and grease (alternate monitoring parameter)20.3720.37
Subpart D Cleaning or Etching Bath
Pollutant or pollutant property PSNS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.0670.027
Cyanide0.0360.015
Zinc0.1830.075
TTO0.124
Oil and grease (alternate monitoring parameter)1.791.79
Subpart D Cleaning or Etching Rinse
Pollutant or pollutant property PSNS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.520.21
Cyanide0.280.11
Zinc1.420.59
TTO0.96
Oil and grease (alternate monitoring parameter)13.9113.91
Subpart D Cleaning or Etching Scrubber Liquor
Pollutant or pollutant property PSNS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.720.29
Cyanide0.390.16
Zinc1.970.812
TTO1.34
Oil and grease (alternate monitoring parameter)19.3319.33
[48 FR 49149, Oct. 24, 1983; 49 FR 11632, 11633, Mar. 27, 1984]
§ 467.47 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional pollutant control technology. [Reserved]
authority: Secs. 301, 304(b), (c), (e), and (g), 306(b) and (c), 307(b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311,1314,c,e,and, 1316(b) andc, 1317(b) andc,1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 48 FR 49149, Oct. 24, 1983, unless otherwise noted.
cite as: 40 CFR 467.46
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