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

40 CFR 464.32: 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/1,000 kkg or lb/million lb of sand reclaimed; 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 Cleaning 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) 0.0129 0.0071
Lead (T) 0.0353 0.0174
Zinc (T) 0.0656 0.025
Oil and grease 1.34 0.446
TSS 1.7 0.67
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) 0.29 0.16 0.0029
Lead (T) 0.79 0.39 0.0098
Zinc (T) 1.47 0.56 0.0179
Oil and grease 30 10 0.223
TSS 38 15 0.446
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 (5.33/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) 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) 0.0138 0.0076
Lead (T) 0.0376 0.0185
Zinc (T) 0.0699 0.0266
Oil and grease 1.43 0.476
TSS 1.81 0.713
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) 0.29 0.16 0.0031
Lead (T) 0.79 0.39 0.0105
Zinc (T) 1.47 0.56 0.019
Oil and grease 30 10 0.238
TSS 38 15 0.476
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 (5.7/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) 0.218 0.12
Lead (T) 0.593 0.293
Zinc (T) 1.1 0.421
Total phenols 0.656 0.225
Oil and grease 22.5 7.51
TSS 28.5 11.3
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 (mg/l) 2
Copper (T) 0.29 0.16 0.0488
Lead (T) 0.79 0.39 0.165
Zinc (T) 1.47 0.56 0.3
Total phenols 0.86 0.3 0.15
Oil and grease 30 10 3.76
TSS 38 15 7.51
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 (0.090/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) 3.19 1.76
Lead (T) 8.7 4.3
Zinc (T) 16.2 6.17
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) 0.29 0.16 0.716
Lead (T) 0.79 0.39 2.42
Zinc (T) 1.47 0.56 4.41
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) 1.02 0.561
Lead (T) 2.77 1.37
Zinc (T) 5.15 1.96
Total phenols 3.01 1.05
Oil and grease 105 35
TSS 133 52.6
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) 0.29 0.16 0.228
Lead (T) 0.79 0.39 0.771
Zinc (T) 1.47 0.56 1.4
Total phenols 0.86 0.3 0.701
Oil and grease 30 10 17.5
TSS 38 15 35
pH (3) (3) (3)
1 kg/62.3 million Sm3 (pounds per billion SCF) or air scrubbed.
2 These concentrations must be multiplied by the ratio of (0.42/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) 0.0428 0.0236
Lead (T) 0.117 0.0576
Zinc (T) 0.217 0.0827
Oil and grease 4.43 1.48
TSS 5.61 2.22
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) 0.29 0.16 0.0096
Lead (T) 0.79 0.39 0.0325
Zinc (T) 1.47 0.56 0.0591
Oil and grease 30 10 0.738
TSS 38 15 1.48
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 (17.7/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.
(h) Slag 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) 0.0527 0.0291
Lead (T) 0.144 0.0709
Zinc (T) 0.267 0.102
Oil and grease 5.46 1.82
TSS 6.91 2.73
pH (1) (1)
1 Within the range 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) 0.29 0.16 0.0118
Lead (T) 0.79 0.39 0.04
Zinc (T) 1.47 0.56 0.0728
Oil and grease 30 10 0.909
TSS 38 15 1.82
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 (21.8/x) where x is the actual normalized process wasterwater 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.
(i) Wet Sand Reclamation 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 sand reclaimed
Copper (T) 0.217 0.12
Lead (T) 0.59 0.291
Zinc (T) 1.1 0.418
Total phenols 0.642 0.224
Oil and grease 22.4 7.47
TSS 28.4 11.2
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) 0.29 0.16 0.0485
Lead (T) 0.79 0.39 0.164
Zinc (T) 1.47 0.56 0.299
Total phenols 0.86 0.3 0.149
Oil and grease 30 10 3.73
TSS 38 15 7.47
pH (3) (3) (3)
1 kg/1,000 kkg (pounds per million pounds) of sand reclaimed.
2 These concentrations must be multiplied by the ratio of (89.5/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of sand reclaimed) 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 C—Ferrous Casting Subcategory

(a) Casting Cleaning 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) 0.0129 0.0071

Lead (T) 0.0353 0.0174

Zinc (T) 0.0656 0.025

Oil and grease 1.34 0.446

TSS 1.7 0.67

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) 0.29 0.16 0.0029

Lead (T) 0.79 0.39 0.0098

Zinc (T) 1.47 0.56 0.0179

Oil and grease 30 10 0.223

TSS 38 15 0.446

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 (5.33/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) 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) 0.0138 0.0076

Lead (T) 0.0376 0.0185

Zinc (T) 0.0699 0.0266

Oil and grease 1.43 0.476

TSS 1.81 0.713

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) 0.29 0.16 0.0031

Lead (T) 0.79 0.39 0.0105

Zinc (T) 1.47 0.56 0.019

Oil and grease 30 10 0.238

TSS 38 15 0.476

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 (5.7/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) 0.218 0.12

Lead (T) 0.593 0.293

Zinc (T) 1.1 0.421

Total phenols 0.656 0.225

Oil and grease 22.5 7.51

TSS 28.5 11.3

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 (mg/l) 2

Copper (T) 0.29 0.16 0.0488

Lead (T) 0.79 0.39 0.165

Zinc (T) 1.47 0.56 0.3

Total phenols 0.86 0.3 0.15

Oil and grease 30 10 3.76

TSS 38 15 7.51

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 (0.090/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) 3.19 1.76

Lead (T) 8.7 4.3

Zinc (T) 16.2 6.17

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) 0.29 0.16 0.716

Lead (T) 0.79 0.39 2.42

Zinc (T) 1.47 0.56 4.41

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) 1.02 0.561

Lead (T) 2.77 1.37

Zinc (T) 5.15 1.96

Total phenols 3.01 1.05

Oil and grease 105 35

TSS 133 52.6

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) 0.29 0.16 0.228

Lead (T) 0.79 0.39 0.771

Zinc (T) 1.47 0.56 1.4

Total phenols 0.86 0.3 0.701

Oil and grease 30 10 17.5

TSS 38 15 35

pH (3) (3) (3)

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

2 These concentrations must be multiplied by the ratio of (0.42/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) 0.0428 0.0236

Lead (T) 0.117 0.0576

Zinc (T) 0.217 0.0827

Oil and grease 4.43 1.48

TSS 5.61 2.22

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) 0.29 0.16 0.0096

Lead (T) 0.79 0.39 0.0325

Zinc (T) 1.47 0.56 0.0591

Oil and grease 30 10 0.738

TSS 38 15 1.48

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 (17.7/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.

(h) Slag 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) 0.0527 0.0291

Lead (T) 0.144 0.0709

Zinc (T) 0.267 0.102

Oil and grease 5.46 1.82

TSS 6.91 2.73

pH (1) (1)

1 Within the range 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) 0.29 0.16 0.0118

Lead (T) 0.79 0.39 0.04

Zinc (T) 1.47 0.56 0.0728

Oil and grease 30 10 0.909

TSS 38 15 1.82

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 (21.8/x) where x is the actual normalized process wasterwater 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.

(i) Wet Sand Reclamation 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 sand reclaimed

Copper (T) 0.217 0.12

Lead (T) 0.59 0.291

Zinc (T) 1.1 0.418

Total phenols 0.642 0.224

Oil and grease 22.4 7.47

TSS 28.4 11.2

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) 0.29 0.16 0.0485

Lead (T) 0.79 0.39 0.164

Zinc (T) 1.47 0.56 0.299

Total phenols 0.86 0.3 0.149

Oil and grease 30 10 3.73

TSS 38 15 7.47

pH (3) (3) (3)

1 kg/1,000 kkg (pounds per million pounds) of sand reclaimed.

2 These concentrations must be multiplied by the ratio of (89.5/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of sand reclaimed) 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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