40 CFR § 420.94 - New source performance standards (NSPS).

---
identifier: "/us/cfr/t40/s420.94"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.94 - New source performance standards (NSPS)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.94"
section_name: "New source performance standards (NSPS)."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "420"
part_name: "IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1311, 1314, 1316, 1317, 1318, 1342, and 1361."
regulatory_source: "47 FR 23284, May 27, 1982, unless otherwise noted."
cfr_part: "420"
---


# 420.94 New source performance standards (NSPS).

The discharge of wastewater pollutants from any new source subject to this subpart shall not exceed the standards set forth below.

(a) *Sulfuric acid pickling (spent acid solutions and rinse waters)*—(1) *Rod, wire, and coil.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0146 | 0.00626 |
| O&G* | 0.00626 | 0.00209 |
| Lead | 0.0000939 | 0.0000313 |
| Zinc | 0.000125 | 0.0000417 |
| pH | () | () |
| *The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(2) *Bar, billet, and bloom.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.00876 | 0.00376 |
| O&G* | 0.00376 | 0.00125 |
| Lead | 0.0000563 | 0.0000188 |
| Zinc | 0.0000751 | 0.0000250 |
| pH | () | () |
| *The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(3) *Strip, sheet, and plate.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0117 | 0.00501 |
| O&G | 0.00501 | 0.00167 |
| Lead | 0.0000751 | 0.0000250 |
| Zinc | 0.000100 | 0.0000334 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(4) *Pipe, tube and other products.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0204 | 0.00876 |
| O&G | 0.00876 | 0.00292 |
| Lead | 0.000131 | 0.0000438 |
| Zinc | 0.000175 | 0.0000584 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(5) *Fume scrubbers.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| TSS | 5.72 | 2.45 |
| O&G | 2.45 | 0.819 |
| Lead | 0.0368 | 0.0123 |
| Zinc | 0.0491 | 0.0164 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

The above limitations shall be applicable to each fume scrubber associated with a sulfuric acid pickling operation.

(b) *Hydrochloric acid pickling (spent acid solutions and rinse waters)*—(1) *Rod, wire, and coil.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0175 | 0.00751 |
| O&G | 0.00751 | 0.00250 |
| Lead | 0.000113 | 0.0000376 |
| Zinc | 0.000150 | 0.0000501 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(2) *Strip, sheet, and plate.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0117 | 0.00501 |
| O&G | 0.00501 | 0.00167 |
| Lead | 0.0000751 | 0.0000250 |
| Zinc | 0.000100 | 0.0000334 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(3) *Pipe, tube, and other products.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0321 | 0.0138 |
| O&G | 0.0138 | 0.00459 |
| Lead | 0.000206 | 0.0000688 |
| Zinc | 0.000275 | 0.0000918 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(4) *Fume scrubbers.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| TSS | 5.72 | 2.45 |
| O&G | 2.45 | 0.819 |
| Lead | 0.0368 | 0.0123 |
| Zinc | 0.0491 | 0.0164 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

The above limitations shall be applicable to each fume scrubber associated with a hydrochloric acid pickling operation.

(c) *Combination acid pickling (spent acid solutions and rinse waters)*—(1) *Rod, wire, and coil.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0204 | 0.00876 |
| O&G | 0.00876 | 0.00292 |
| Chromium | 0.000292 | 0.000117 |
| Nickel | 0.000263 | 0.0000876 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(2) *Bar, billet, and bloom.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0117 | 0.00501 |
| O&G | 0.00501 | 0.00167 |
| Chromium | 0.000167 | 0.0000667 |
| Nickel | 0.000150 | 0.0000501 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(3) *Strip, sheet and plate—continuous.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0496 | 0.0213 |
| O&G | 0.0213 | 0.00710 |
| Chromium | 0.000710 | 0.000284 |
| Nickel | 0.000638 | 0.000213 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(4) *Strip, sheet, and plate—batch.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0175 | 0.00751 |
| O&G | 0.00751 | 0.00250 |
| Chromium | 0.000250 | 0.000100 |
| Nickel | 0.000225 | 0.0000751 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(5) *Pipe, tube, and other products.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.0292 | 0.0125 |
| O&G | 0.0125 | 0.00418 |
| Chromium | 0.000418 | 0.000167 |
| Nickel | 0.000376 | 0.000125 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(6) *Fume scrubbers.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| TSS | 5.72 | 2.45 |
| O&G | 2.45 | 0.819 |
| Chromium | 0.0819 | 0.0327 |
| Nickel | 0.0735 | 0.0245 |
| pH | () | () |
| The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

The above limitations shall be applicable to each fume scrubber associated with a combination acid pickling operation.

[47 FR 23284, May 27, 1982, as amended at 49 FR 21032, May 17, 1984]