40 CFR § 420.105 - Pretreatment standards for existing sources (PSES).

---
identifier: "/us/cfr/t40/s420.105"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.105 - Pretreatment standards for existing sources (PSES)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.105"
section_name: "Pretreatment standards for existing sources (PSES)."
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"
---


# 420.105 Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources.

(a) *Cold rolling*—(1) *Recirculation—single stand.*

Subpart J

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.0000209 | 0.0000084 |
| Lead | 0.0000094 | 0.0000031 |
| Nickel | 0.0000188 | 0.0000063 |
| Zinc | 0.0000063 | 0.0000021 |
| Naphthalene | 0.0000021 |  |
| Tetrachloroethylene | 0.0000031 |  |
| The limitations for chromium and nickel shall be applicable in lieu of those for lead and zinc when cold rolling wastewaters are treated with descaling or combination acid pickling wastewaters. |  |  |

(2) *Recirculation—multiple stands.*

Subpart J

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.000104 | 0.0000418 |
| Lead | 0.0000469 | 0.0000156 |
| Nickel | 0.0000939 | 0.0000313 |
| Zinc | 0.0000313 | 0.0000104 |
| Naphthalene | 0.0000104 |  |
| Tetrachloroethylene | 0.0000156 |  |
| The limitations for chromium and nickel shall be applicable in lieu of those for lead and zinc when cold rolling wastewaters are treated with descaling or combination acid pickling wastewaters. |  |  |

(3) *Combination.*

Subpart J

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00125 | 0.000501 |
| Lead | 0.000563 | 0.000188 |
| Nickel | 0.00113 | 0.000376 |
| Zinc | 0.000376 | 0.000125 |
| Naphthalene | 0.000125 |  |
| Tetrachloroethylene | 0.000188 |  |
| The limitations for chromium and nickel shall be applicable in lieu of those for lead and zinc when cold rolling wastewaters are treated with descaling or combination acid pickling wastewaters. |  |  |

(4) *Direct application—single stand.*

Subpart J

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.000376 | 0.000150 |
| Lead | 0.000169 | 0.0000563 |
| Nickel | 0.000338 | 0.000113 |
| Zinc | 0.000113 | 0.0000376 |
| Naphthalene | 0.0000376 |  |
| Tetrachloroethylene | 0.0000563 |  |
| The limitations for chromium and nickel shall be applicable in lieu of those for lead and zinc when cold rolling wastewaters are treated with descaling or combination acid pickling wastewaters. |  |  |

(5) *Direct application—multiple stands.*

Subpart J

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00167 | 0.000668 |
| Lead | 0.000751 | 0.000250 |
| Nickel | 0.00150 | 0.000501 |
| Zinc | 0.000501 | 0.000167 |
| Napthalene | 0.000167 |  |
| Tetrachloroethylene | 0.000250 |  |
| The limitations for chromium and nickel shall be applicable in lieu of those for lead and zinc when cold rolling wastewaters are treated with descaling or combination acid pickling wastewaters. |  |  |

(b) *Cold worked pipe and tube mills*—(1) *Using water.*

Subpart J

|  |  |  |
| --- | --- | --- |
|  | kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.0000209 | 0.0000084 |
| Lead | 0.0000094 | 0.0000031 |
| Nickel | 0.0000188 | 0.0000063 |
| Zinc | 0.0000063 | 0.0000021 |
| The limitations for chromium and nickel shall be applicable in lieu of those for lead and zinc when cold forming wastewaters are treated with descaling or combination acid pickling wastewaters. |  |  |

(2) *Using oil solutions.*

Subpart J

|  |  |  |
| --- | --- | --- |
|  | kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.0000209 | 0.0000084 |
| Lead | 0.0000094 | 0.0000031 |
| Nickel | 0.0000188 | 0.0000063 |
| Zinc | 0.0000063 | 0.0000021 |
| Naphthalene | 0.0000021 |  |
| Tetrachloroethylene | 0.0000031 |  |
| The limitations for chromium and nickel shall be applicable in lieu of those for lead and zinc when cold forming wastewaters are treated with descaling or combination acid pickling wastewaters. |  |  |

[47 FR 23284, May 27, 1982, as amended at 49 FR 21035, May 17, 1984]