40 CFR § 464.24 - New source performance standards.

---
identifier: "/us/cfr/t40/s464.24"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 464.24 - New source performance standards."
title_number: 40
title_name: "Protection of Environment"
section_number: "464.24"
section_name: "New source performance standards."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "464"
part_name: "METAL MOLDING AND CASTING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307, 308, and 501 of the Clean Water Act (Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e) and (g), 1316 (b) and (c), 1317 (b) and (c), 1318, and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217."
regulatory_source: "50 FR 45247, Oct. 30, 1985, unless otherwise noted."
cfr_part: "464"
---


# 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
<sup>3</sup> 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 | () | () |
| Within the range of 7.0 to 10.0 at all times. |  |  |

|  | Maximum for any 1 day | Maximum for monthly average | Annual average |
| --- | --- | --- | --- |
|  | (mg/l) | (mg/l) |  |
| 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 | () | () | () |
| kg/1,000 kkg (pounds per million pounds) of metal poured. |  |  |  |
| 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. |  |  |  |
| 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 | () | () |
| Within the range of 7.0 to 10.0 at all times. |  |  |

|  | Maximum for any 1 day | Maximum for monthly average | Annual average |
| --- | --- | --- | --- |
|  | (mg/l) | (mg/l) |  |
| 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 | () | () | () |
| kg/1,000 kkg (pounds per million pounds) of metal poured. |  |  |  |
| 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. |  |  |  |
| 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  (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 | () | () |
| Within the range of 7.0 to 10.0 at all times. |  |  |

|  | Maximum for any 1 day | Maximum for monthly average | Annual average |
| --- | --- | --- | --- |
|  | (mg/l) | (mg/l) |  |
| 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 | () | () | () |
| kg/62.3 million Sm  (pounds per billion SCF) of air scrubbed. |  |  |  |
| 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. |  |  |  |
| 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 | () | () |
| Within the range of 7.0 to 10.0 at all times. |  |  |

|  | Maximum for any 1 day | Maximum for monthly average | Annual average |
| --- | --- | --- | --- |
|  | (mg/l) | mg/l) |  |
| 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 | () | () | () |
| kg/1,000 kkg (pounds per million pounds) of metal poured. |  |  |  |
| 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. |  |  |  |
| 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  (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 | () | () |
| Within the range of 7.0 to 10.0 at all times. |  |  |

|  | Maximum for any 1 day | Maximum for monthly average | Annual average |
| --- | --- | --- | --- |
|  | (mg/l) | (mg/l) |  |
| 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 | () | () | () |
| kg/62.3 Sm  (pounds per billion SCF) of air scrubbed. |  |  |  |
| 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. |  |  |  |
| 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 | () | () |
| Within the range of 7.0 to 10.0 at all times. |  |  |

|  | Maximum for any 1 day | Maximum for monthly average | Annual average |
| --- | --- | --- | --- |
|  | (mg/1) | (mg/1) |  |
| 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 | () | () | () |
| kg/1,000 kkg (pounds per million pound) of metal poured. |  |  |  |
| 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. |  |  |  |
| Within the range of 7.0 to 10.0 at all times. |  |  |  |

[50 FR 45247, Oct. 30, 1985; 51 FR 21761, June 16, 1986]