40 CFR § 420.85 - Pretreatment standards for existing sources (PSES).

---
identifier: "/us/cfr/t40/s420.85"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.85 - Pretreatment standards for existing sources (PSES)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.85"
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"
---


# 420.85 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) *Salt bath descaling, oxidizing*—(1) *Batch, sheet and plate.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00292 | 0.00117 |
| Nickel | 0.00263 | 0.000876 |

(2) *Batch, rod and wire.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00175 | 0.000701 |
| Nickel | 0.00158 | 0.000526 |

(3) *Batch, pipe and tube.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00709 | 0.00284 |
| Nickel | 0.00638 | 0.00213 |

(4) *Continuous.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00138 | 0.000551 |
| Nickel | 0.00124 | 0.000413 |

(b) *Salt bath descaling, reducing*—(1) *Batch.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Cyanide | 0.00102 | 0.000339 |
| Chromium | 0.00136 | 0.000542 |
| Nickel | 0.00122 | 0.000407 |

(2) *Continuous.*

Subpart H

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product) |  |
| Cyanide | 0.00569 | 0.00190 |
| Chromium | 0.00759 | 0.00304 |
| Nickel | 0.00683 | 0.00228 |

[47 FR 23284, May 27, 1982; 47 FR 41739, Sept. 22, 1982]