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

40 CFR 464.24: New source performance standards.

Any new source subject to this subpart must achieve the following new source performance standards (NSPS), 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 standards for copper, lead, zinc, total phenols, oil and grease, and TSS. For non-continuous dischargers, annual average mass standards and maximum day and maximum for monthly average concentration (mg/l) standards shall apply. Concentration standards and annual average mass standards shall only apply to non-continuous dischargers.
(a) Casting Quench Operations.
NSPS
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) 0.0211 0.0104
Zinc (T) 0.0303 0.0116
Oil and grease 1.2 0.399
TSS 0.598 0.479
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) 0.53 0.26 0.006
Zinc (T) 0.76 0.29 0.0072
Oil and grease 30 10 0.199
TSS 15 12 0.104
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 (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.
NSPS
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) 0.639 0.314
Zinc (T) 0.916 0.35
Oil and grease 36.2 12.1
TSS 18.1 14.5
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) 0.53 0.26 0.181
Zinc (T) 0.76 0.29 0.217
Oil and grease 30 10 6.03
TSS 15 12 3.13
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 (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.
NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed
Copper (T) 0.553 0.301
Lead (T) 0.38 0.187
Zinc (T) 0.545 0.208
Total phenols 0.617 0.215
Oil and grease 21.5 7.18
TSS 10.8 8.61
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) 0.53 0.26 0.108
Zinc (T) 0.76 0.29 0.129
Total phenols 0.86 0.3 0.144
Oil and grease 30 10 3.59
TSS 15 12 1.87
pH (3) (3) (3)
1 kg/62.3 million Sm 3 (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.
NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/1,000 kkg (pounds per millions pounds) of metal poured
Copper (T) 8.48 4.63
Lead (T) 5.84 2.86
Zinc (T) 8.37 3.19
Oil and grease 330 110
TSS 165 132
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) 0.53 0.26 1.65
Zinc (T) 0.76 0.29 1.98
Oil and grease 30 10 55.1
TSS 15 12 28.6
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.
NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed
Copper (T) 1.81 0.988
Lead (T) 1.25 0.612
Zinc (T) 1.79 0.673
Total phenols 2.02 0.706
Oil and grease 70.6 23.5
TSS 35.3 28.2
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) 0.77 0.42 0.4
Lead (T) 0.53 0.26 0.353
Zinc (T) 0.76 0.29 0.424
Total phenols 0.86 0.3 0.471
Oil and grease 30 10 11.8
TSS 15 12 6.12
pH (3) (3) (3)
1 kg/62.3 Sm 3 (pounds 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 waste-water 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.
NSPS
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) 0.27 0.132
Zinc (T) 0.387 0.148
Oil and grease 15.3 5.09
TSS 7.63 6.11
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/1) 2 (mg/1) 2
Copper (T) 0.77 0.42 0.0865
Lead (T) 0.53 0.26 0.0763
Zinc (T) 0.76 0.29 0.0916
Oil and grease 30 10 2.54
TSS 15 12 1.32
pH (3) (3) (3)
1 kg/1,000 kkg (pounds per million pound) of metal poured.
2 These concentrations must be multiplied by the ratio of (61/x) where x is the actual normalized process waste-water 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.

NSPS

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) 0.0211 0.0104

Zinc (T) 0.0303 0.0116

Oil and grease 1.2 0.399

TSS 0.598 0.479

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) 0.53 0.26 0.006

Zinc (T) 0.76 0.29 0.0072

Oil and grease 30 10 0.199

TSS 15 12 0.104

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 (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.

NSPS

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) 0.639 0.314

Zinc (T) 0.916 0.35

Oil and grease 36.2 12.1

TSS 18.1 14.5

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) 0.53 0.26 0.181

Zinc (T) 0.76 0.29 0.217

Oil and grease 30 10 6.03

TSS 15 12 3.13

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 (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.

NSPS

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

kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed

Copper (T) 0.553 0.301

Lead (T) 0.38 0.187

Zinc (T) 0.545 0.208

Total phenols 0.617 0.215

Oil and grease 21.5 7.18

TSS 10.8 8.61

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) 0.53 0.26 0.108

Zinc (T) 0.76 0.29 0.129

Total phenols 0.86 0.3 0.144

Oil and grease 30 10 3.59

TSS 15 12 1.87

pH (3) (3) (3)

1 kg/62.3 million Sm 3 (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.

NSPS

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

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

Copper (T) 8.48 4.63

Lead (T) 5.84 2.86

Zinc (T) 8.37 3.19

Oil and grease 330 110

TSS 165 132

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) 0.53 0.26 1.65

Zinc (T) 0.76 0.29 1.98

Oil and grease 30 10 55.1

TSS 15 12 28.6

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.

NSPS

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

kg/62.3 million Sm 3 (pounds per billion SCF) of air scrubbed

Copper (T) 1.81 0.988

Lead (T) 1.25 0.612

Zinc (T) 1.79 0.673

Total phenols 2.02 0.706

Oil and grease 70.6 23.5

TSS 35.3 28.2

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) 0.77 0.42 0.4

Lead (T) 0.53 0.26 0.353

Zinc (T) 0.76 0.29 0.424

Total phenols 0.86 0.3 0.471

Oil and grease 30 10 11.8

TSS 15 12 6.12

pH (3) (3) (3)

1 kg/62.3 Sm 3 (pounds 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 waste-water 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.

NSPS

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) 0.27 0.132

Zinc (T) 0.387 0.148

Oil and grease 15.3 5.09

TSS 7.63 6.11

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/1) 2 (mg/1) 2

Copper (T) 0.77 0.42 0.0865

Lead (T) 0.53 0.26 0.0763

Zinc (T) 0.76 0.29 0.0916

Oil and grease 30 10 2.54

TSS 15 12 1.32

pH (3) (3) (3)

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

2 These concentrations must be multiplied by the ratio of (61/x) where x is the actual normalized process waste-water 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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