Regulations last checked for updates: May 01, 2025

Title 40 - Protection of Environment last revised: Nov 01, 2025
All TitlesTitle 40Chapter IPart 467Subpart B - Subpart B—Rolling With Emulsions Subcategory
Collapse to view only § 467.20 - Applicability; description of the rolling with emulsions subcategory.
Table of Contents

§ 467.20 - Applicability; description of the rolling with emulsions subcategory.

§ 467.21 - Specialized definitions.

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

§ 467.23 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

§ 467.24 - New source performance standards.

§ 467.25 - Pretreatment standards for existing sources.

§ 467.26 - Pretreatment standards for new sources.

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

§ 467.20 - Applicability; description of the rolling with emulsions subcategory.

This subpart applies to dischargers of pollutants to waters of the United States and introductions of pollutants into publicly owned treatment works from the core and the ancillary operations of the rolling with emulsions subcategory.

§ 467.21 - Specialized definitions.

For the purpose of this subpart:

(a) The “core” of the rolling with emulsions subcategory shall include rolling using emulsions, roll grinding, stationary casting, homogenizing, artificial aging, annealing, and sawing.

(b) The term “ancillary operation” shall mean any operation not previously included in the core, performed on-site, following or preceding the rolling operation. The ancillary operations shall include direct chill casting, solution heat treatment, cleaning or etching, and degassing.

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

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

Subpart B Core
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions
Chromium0.0570.024
Cyanide0.0380.016
Zinc0.190.079
Aluminum0.840.416
Oil and grease2.601.56
Suspended solids5.332.53
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

Subpart B Direct Chill Casting Contact Cooling Water
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cast
Chromium0.590.24
Cyanide0.390.16
Zinc1.940.81
Aluminum8.554.26
Oil and grease26.5815.95
Suspended solids54.4925.92
pH( 1)( 1)

1 The pH shall be maintained within the range of 7.0 to 10.0 at all times except for those situations when this waste stream is discharged separately and without commingling with any other wastewater in which case the pH shall be within the range of 6.0 to 10.0 at all times.

Subpart B Solution Heat Treatment Contact Cooling Water
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum quenched
Chromium3.391.39
Cyanide2.240.93
Zinc11.254.70
Aluminum49.5524.66
Oil and grease154.1092.46
Suspended solids315.91150.25
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

Subpart B Cleaning or Etching Bath
Pollutant or pollutant property BPT effluent limitations
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
Zinc0.2620.109
Aluminum1.150.573
Oil and grease3.582.15
Suspended solids7.343.49
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

Subpart B Cleaning or Etching Rinse
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium6.122.51
Cyanide4.041.67
Zinc20.318.49
Aluminum89.4644.52
Oil and grease278.24166.95
Suspended solids570.39271.29
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

Subpart B Cleaning or Etching Scrubber Liquor
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium7.002.86
Cyanide4.611.91
Zinc23.229.70
Aluminum102.2450.88
Oil and grease318.00190.80
Suspended solids651.90310.05
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

[48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11632, Mar. 27, 1984, as amended at 53 FR 52370, Dec. 27, 1988]
§ 467.23 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. The discharge of process wastewater pollutants from the core shall not exceed the values set forth below:

Subpart B Core
Pollutant or pollutant property BAT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions
Chromium0.0570.024
Cyanide0.0380.016
Zinc0.190.079
Aluminum0.840.42
Subpart B Direct Chill Casting Contact Cooling Water
Pollutant or pollutant property BAT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cast
Chromium0.590.24
Cyanide0.390.16
Zinc1.940.81
Aluminum8.554.26
Subpart B Solution Heat Treatment Contact Cooling Water
Pollutant or pollutant property BAT Effluent Limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum quenched
Chromium0.900.37
Cyanide0.590.25
Zinc2.981.25
Aluminum13.106.52
Subpart B Cleaning or Etching Bath
Pollutant or pollutant property BAT effluent limitations
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
Zinc0.260.109
Aluminum1.150.573
Subpart B Cleaning or Etching Rinse
Pollutant or pollutant property BAT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.610.25
Cyanide0.410.17
Zinc2.030.85
Aluminum8.954.45
Subpart B Cleaning or Etching Scrubber Liquor
Pollutant or pollutant property BAT effluent limitations
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched
Chromium0.850.35
Cyanide0.560.23
Zinc2.821.18
Aluminum12.436.19
[48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11633, Mar. 27, 1984]
§ 467.24 - New source performance standards.

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

Subpart B Core
Pollutant or pollutant property NSPS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions
Chromium0.0480.020
Cyanide0.0260.011
Zinc0.1330.055
Aluminum0.800.35
Oil and grease1.301.30
Suspended solids1.951.56
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

Subpart B Direct Chill Casting 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 cast by semicontinuous methods
Chromium0.490.20
Cyanide0.270.11
Zinc1.360.56
Aluminum8.123.60
Oil and grease13.2913.29
Suspended solids19.9415.95
pH( 1)( 1)

1 The pH shall be maintained within the range of 7.0 to 10.0 at all times except for those situations when this waste stream is discharged separately and without commingling with any other wastewater in which case the pH shall be within the range of 6.0 to 10.0 at all times.

Subpart B 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
Cyanide0.410.17
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 10.0 at all times.

Subpart B 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
Chromium0.0670.027
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 10.0 at all times.

Subpart B 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
Aluminum8.503.77
Oil and grease13.9113.91
Suspended solids20.8716.70
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

Subpart B 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
Cyanide0.390.16
Zinc1.970.81
Aluminum11.815.24
Oil and grease19.3319.33
Suspended solids29.0023.20
pH( 1)( 1)

1 Within the range of 7.0 to 10.0 at all times.

[48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11633, Mar. 27, 1984, as amended at 53 FR 52370, Dec. 27, 1988]
§ 467.25 - Pretreatment standards for existing sources.

Except as provided in 40 CFR 403.7 and 403.13, any existing 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 existing sources. The mass of wastewater pollutants in aluminum forming process wastewater introduced into a POTW shall not exceed the following values:

Subpart B Core
Pollutant or pollutant property PSES
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions
Chromium0.0570.024
Cyanide0.0380.016
Zinc0.1900.079
TTO0.090
Oil and grease (alternate monitoring parameter)6.83.4
Subpart B Direct Chill Casting 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 cast by semi-continuous methods
Chromium0.590.24
Cyanide0.390.16
Zinc1.940.81
TTO0.92
Oil and grease (alternate monitoring parameter)6935
Subpart B 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
Chromium0.900.37
Cyanide0.590.25
Zinc2.981.25
TTO1.41
Oil and grease (alternate monitoring parameter)11053
Subpart B 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
Zinc0.2620.109
TTO0.124
Oil and grease (alternate monitoring parameter)9.34.7
Subpart B Cleaning or Etching Rinse
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
Chromium0.610.25
Cyanide0.410.17
Zinc2.030.85
TTO0.96
Oil and grease (alternate monitoring parameter)7336
Subpart B 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
Chromium0.850.35
Cyanide0.560.23
Zinc2.831.18
TTO1.34
Oil and grease (alternate monitoring parameter)10050
[48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11632, 11633, Mar. 27, 1984, as amended at 53 FR 52369, 52370, Dec. 27, 1988]
§ 467.26 - Pretreatment standards for new sources.

Except as provided in § 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 process wastewater pollutants from the core and ancillary operations introduced into a POTW shall not exceed the values set forth below:

Subpart B Core
Pollutant or pollutant property PSNS
Maximum for any 1 day Maximum for monthly average
mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions
Chromium0.0480.020
Cyanide0.0260.011
Zinc0.1330.055
TTO0.090
Oil and grease (alternate monitoring parameter)1.301.30
Subpart B Direct Chill Casting 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 cast by semicontinuous methods
Chromium0.490.20
Cyanide0.270.11
Zinc1.360.56
TTO0.92
Oil and grease (alternate monitoring parameter)13.2913.29
Subpart B 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
Cyanide0.410.17
Zinc2.080.86
TTO1.41
Oil and grease (alternate monitoring parameter)20.3720.37
Subpart B 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 B 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 B 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
Zinc1.970.81
TTO1.34
Oil and grease (alternate monitoring parameter)19.3319.33
[48 FR 49149, Oct. 24, 1983; 49 FR 11631, 11632, Mar. 27, 1984]
§ 467.27 - 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 467.20
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