Regulations last checked for updates: Oct 15, 2026

Title 40 - Protection of Environment last revised: Oct 13, 2026
All TitlesTitle 40Chapter IPart 464Subpart D - Subpart D—Zinc Casting Subcategory
View all text of Subpart D [§ 464.40 - § 464.47]
§ 464.44 - 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)0.03440.0187
Lead (T)0.02370.0116
Zinc (T)0.03390.0129
Oil and grease1.340.446
TSS0.670.536
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)0.770.420.0076
Lead (T)0.530.260.0067
Zinc (T)0.760.290.008
Oil and grease30100.223
TSS15120.116
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 (5.34/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) Die 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)0.00660.0036
Lead (T)0.00460.0022
Zinc (T)0.00660.0025
Total phenols0.00740.0026
Oil and grease0.2590.0864
TSS0.130.104
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)0.770.420.0015
Lead (T)0.530.260.0013
Zinc (T)0.760.290.0016
Total phenols0.860.30.0017
Oil and grease30100.0432
TSS15120.0225
pH( 3)( 3)( 3)

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

2These concentrations must be multiplied by the ratio of (1.04/x) where x is the actual normalized process wastewater flow (in gallons per 1,000 pounds of metal poured) for a specific plant.

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

(c) 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)1.560.852
Lead (T)1.070.527
Zinc (T)1.540.588
Total phenols1.740.608
Oil and grease60.820.3
TSS30.424.3
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)0.770.420.345
Lead (T)0.530.260.304
Zinc (T)0.760.290.365
Total phenols0.860.30.406
Oil and grease301010.1
TSS15125.27
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 (0.243/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) 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)0.3040.166
Lead (T)0.2090.103
Zinc (T)0.30.114
Oil and grease11.83.94
TSS5.914.73
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)0.770.420.067
Lead (T)0.530.260.0591
Zinc (T)0.760.290.071
Oil and grease30101.97
TSS15121.03
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 (47.3/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.

[50 FR 45247, Oct. 30, 1985; 51 FR 21762, June 16, 1986]
source: 50 FR 45247, Oct. 30, 1985, unless otherwise noted.
cite as: 40 CFR 464.44
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