Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR 464.22: Effluent limitations guidelines 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, except that non-continuous dischargers shall not be subject to the maximum day and maximum for monthly average mass (kg/1,000 kkg or lb/million lb of metal poured; kg/62.3 million Sm 3 or lb/billion SCF of air scrubbed) effluent limitations for copper, lead, zinc, total phenols, oil and grease, and TSS. For non-continuous dischargers, annual average mass limitations and maximum day and maximum for monthly average concentration (mg/l) limitations shall apply. Concentration limitations and annual average mass limitations shall only apply to non-continuous dischargers.
(a) Casting Quench Operations.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/1,000 kkg (pounds per million pounds) of metal poured
Copper (T) 0.0307 0.0168
Lead (T) 0.0315 0.0156
Zinc (T) 0.0455 0.0171
Oil and grease 1.2 0.399
TSS 1.52 0.598
pH (1) (1)
1 Within the range of 7.0 to 10.0 at all times.
Maximum for any 1 day Maximum for monthly average Annual average 1
(mg/l) 2 (mg/l) 2
Copper (T) 0.77 0.42 0.0068
Lead (T) 0.79 0.39 0.0088
Zinc (T) 1.14 0.43 0.0108
Oil and grease 30 10 0.199
TSS 38 15 0.399
pH (3) (3) (3)
1 kg/1000 kkg (pounds per million pounds) of metal poured
2 These concentrations must be multiplied by the ratio of (4.8/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
3 Within the range of 7.0 to 10.0 at all times.
(b) Direct Chill Casting Operations.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/1,000 kkg (pounds per million pounds) of metal poured
Copper (T) 0.928 0.506
Lead (T) 0.952 0.47
Zinc (T) 1.37 0.518
Oil and grease 36.2 12.1
TSS 45.8 18.1
pH (1) (1)
1 Within the range of 7.0 to 10.0 at all times.
Maximum for any 1 day Maximum for monthly average Annual average 1
(mg/l) 2 (mg/l) 2
Copper (T) 0.77 0.42 0.205
Lead (T) 0.79 0.39 0.265
Zinc (T) 1.14 0.43 0.326
Oil and grease 30 10 6.03
TSS 38 15 12.1
pH (3) (3) (3)
1 kg/1000 kkg (pounds per million pounds) of metal poured.
2 These concentrations must be multiplied by the ratio of (145/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
3 Within the range of 7.0 to 10.0 at all times.
(c) Dust Collection Scrubber Operations.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed
Copper (T) 0.553 0.301
Lead (T) 0.567 0.28
Zinc (T) 0.818 0.309
Total phenols 0.617 0.215
Oil and grease 21.5 7.18
TSS 27.3 10.8
ph (1) (1)
1 Within the range of 7.0 to 10.0 at all times.
Maximum for any 1 day Maximum for monthly average Annual average 1
(mg/l) 2 (mg/l) 2
Copper (T) 0.77 0.42 0.122
Lead (T) 0.79 0.39 0.158
Zinc (T) 1.14 0.43 0.194
Total phenols 0.86 0.3 0.144
Oil and grease 30 10 3.59
TSS 38 15 7.18
pH (3) (3) (3)
1 kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.
2 These concentrations must be multiplied by the ratio of (0.086/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
3 Within the range of 7.0 to 10.0 at all times.
(d) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters.
(e) Investment Casting.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/1,000 kkg (pounds per million pounds) of metal poured
Copper (T) 8.48 4.63
Lead (T) 8.7 4.3
Zinc (T) 12.6 4.74
Oil and grease 330 110
TSS 419 165
pH (1) (1)
1 Within the range of 7.0 to 10.0 at all times.
Maximum for any 1 day Maximum for monthly average Annual average 1
(mg/l) 2 (mg/l) 2
Copper (T) 0.77 0.42 1.87
Lead (T) 0.79 0.39 2.42
Zinc (T) 1.14 0.43 2.97
Oil and grease 30 10 55.1
TSS 38 15 110
pH (3) (3) (3)
1 kg/1,000 kkg (pounds per million pounds) of metal poured.
2 These concentrations must be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
3 Within the range of 7.0 to 10.0 at all times.
(f) Melting Furnace Scrubber Operations.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed
Copper (T) 1.81 0.988
Lead (T) 1.86 0.918
Zinc (T) 2.68 1.01
Total phenols 2.02 0.706
Oil and grease 70.6 23.5
TSS 89.4 35.3
pH (1) (1)
1 Within the range of 7.0 to 10.0 at all times.
Maximum for any 1 day Maximum for monthly average Annual average 1
(mg/l) 2 (mg/l) 2
Copper (T) 0.77 0.42 0.4
Lead (T) 0.79 0.39 0.518
Zinc (T) 1.14 0.43 0.635
Total phenols 0.86 0.3 0.467
Oil and grease 30 10 11.8
TSS 38 15 23.5
pH (3) (3) (3)
1 kg/62.3 million Sm3 (pound per billion SCF) of air scrubbed.
2 These concentrations must be multiplied by the ratio of (0.282/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
3 Within the range of 7.0 to 10.0 at all times.
(g) Mold Cooling Operations.
BPT Effluent Limitations
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/1,000 kkg (pounds per million pounds) of metal poured
Copper (T) 0.392 0.214
Lead (T) 0.402 0.199
Zinc (T) 0.58 0.219
Oil and grease 15.3 5.09
TSS 19.3 7.63
pH (1) (1)
1 Within the range of 7.0 to 10.0 at all times.
Maximum for any 1 day Maximum for monthly average Annual average 1
(mg/l) 2 (mg/l) 2
Copper (T) 0.77 0.42 0.0865
Lead (T) 0.79 0.39 0.112
Zinc (T) 1.14 0.43 0.137
Oil and grease 30 10 2.54
TSS 38 15 5.09
pH (3) (3) (3)
1 kg/1,000 kkg (pounds per million pounds) of metal poured.
2 These concentrations must be multiplied by the ratio of (61/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
3 Within the range of 7.0 to 10.0 at all times.

Where this section sits in the code

Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS
PART 464—METAL MOLDING AND CASTING POINT SOURCE CATEGORY
Subpart B—Copper Casting Subcategory

(a) Casting Quench Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.0307 0.0168

Lead (T) 0.0315 0.0156

Zinc (T) 0.0455 0.0171

Oil and grease 1.2 0.399

TSS 1.52 0.598

pH (1) (1)

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

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 0.0068

Lead (T) 0.79 0.39 0.0088

Zinc (T) 1.14 0.43 0.0108

Oil and grease 30 10 0.199

TSS 38 15 0.399

pH (3) (3) (3)

1 kg/1000 kkg (pounds per million pounds) of metal poured

2 These concentrations must be multiplied by the ratio of (4.8/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

(b) Direct Chill Casting Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.928 0.506

Lead (T) 0.952 0.47

Zinc (T) 1.37 0.518

Oil and grease 36.2 12.1

TSS 45.8 18.1

pH (1) (1)

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

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 0.205

Lead (T) 0.79 0.39 0.265

Zinc (T) 1.14 0.43 0.326

Oil and grease 30 10 6.03

TSS 38 15 12.1

pH (3) (3) (3)

1 kg/1000 kkg (pounds per million pounds) of metal poured.

2 These concentrations must be multiplied by the ratio of (145/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed

Copper (T) 0.553 0.301

Lead (T) 0.567 0.28

Zinc (T) 0.818 0.309

Total phenols 0.617 0.215

Oil and grease 21.5 7.18

TSS 27.3 10.8

ph (1) (1)

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

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 0.122

Lead (T) 0.79 0.39 0.158

Zinc (T) 1.14 0.43 0.194

Total phenols 0.86 0.3 0.144

Oil and grease 30 10 3.59

TSS 38 15 7.18

pH (3) (3) (3)

1 kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.

2 These concentrations must be multiplied by the ratio of (0.086/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

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

(d) Grinding Scrubber Operations. No discharge of process wastewater pollutants to navigable waters.

(e) Investment Casting.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 8.48 4.63

Lead (T) 8.7 4.3

Zinc (T) 12.6 4.74

Oil and grease 330 110

TSS 419 165

pH (1) (1)

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

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 1.87

Lead (T) 0.79 0.39 2.42

Zinc (T) 1.14 0.43 2.97

Oil and grease 30 10 55.1

TSS 38 15 110

pH (3) (3) (3)

1 kg/1,000 kkg (pounds per million pounds) of metal poured.

2 These concentrations must be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

(f) Melting Furnace Scrubber Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed

Copper (T) 1.81 0.988

Lead (T) 1.86 0.918

Zinc (T) 2.68 1.01

Total phenols 2.02 0.706

Oil and grease 70.6 23.5

TSS 89.4 35.3

pH (1) (1)

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

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 0.4

Lead (T) 0.79 0.39 0.518

Zinc (T) 1.14 0.43 0.635

Total phenols 0.86 0.3 0.467

Oil and grease 30 10 11.8

TSS 38 15 23.5

pH (3) (3) (3)

1 kg/62.3 million Sm3 (pound per billion SCF) of air scrubbed.

2 These concentrations must be multiplied by the ratio of (0.282/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

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

(g) Mold Cooling Operations.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

kg/1,000 kkg (pounds per million pounds) of metal poured

Copper (T) 0.392 0.214

Lead (T) 0.402 0.199

Zinc (T) 0.58 0.219

Oil and grease 15.3 5.09

TSS 19.3 7.63

pH (1) (1)

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

Maximum for any 1 day Maximum for monthly average Annual average 1

(mg/l) 2 (mg/l) 2

Copper (T) 0.77 0.42 0.0865

Lead (T) 0.79 0.39 0.112

Zinc (T) 1.14 0.43 0.137

Oil and grease 30 10 2.54

TSS 38 15 5.09

pH (3) (3) (3)

1 kg/1,000 kkg (pounds per million pounds) of metal poured.

2 These concentrations must be multiplied by the ratio of (61/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

Collected 2026-08-27T02:26:04Z. Source file · JSON

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