40 CFR § 420.125 - Pretreatment standards for existing sources (PSES).

---
identifier: "/us/cfr/t40/s420.125"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.125 - Pretreatment standards for existing sources (PSES)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.125"
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"
---


# 420.125 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) *Galvanizing, terne coating and other coatings*—(1) *Strip, sheet, and miscellaneous products.*

Subpart L

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.00113 | 0.000376 |
| Zinc | 0.00150 | 0.000500 |
| Chromium (hexavalent) | 0.000150 | 0.0000501 |
| The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step. |  |  |

(2) [Reserved]

(b) *Galvanizing and other coatings*—(1) *Wire products and fasteners.*

Subpart L

|  |  |  |
| --- | --- | --- |
|  | kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.00451 | 0.00150 |
| Zinc | 0.00601 | 0.00200 |
| Chromium (hexavalent) | 0.000601 | 0.000200 |
| The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step. |  |  |

(2) [Reserved]

(c) *Fume scrubbers.*

Subpart L

|  |  |  |
| --- | --- | --- |
|  | Kg per day |  |
| Lead | 0.0368 | 0.0123 |
| Zinc | 0.0491 | 0.0164 |
| Chromium (hexavalent) | 0.00490 | 0.00163 |
| The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step. |  |  |

The above limitations shall be applicable to each fume scrubber associated with any of the coating operations specified above.

[47 FR 23284, May 27, 1982, as amended at 49 FR 21037, May 17, 1984]