40 CFR § 420.35 - Pretreatment standards for existing sources (PSES).

---
identifier: "/us/cfr/t40/s420.35"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.35 - Pretreatment standards for existing sources (PSES)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.35"
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"
---


# 420.35 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) *Iron blast furnace.*

Subpart C

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of products |  |
| Ammonia-N | 0.00876 | 0.00292 |
| Cyanide | 0.00175 | 0.000876 |
| Phenols (4AAP) | 0.0000584 | 0.0000292 |
| Lead | 0.000263 | 0.0000876 |
| Zinc | 0.000394 | 0.000131 |
| The pretreatment standards for ammonia are not applicable to sources that discharge to a POTW with nitrification capability (defined at 420.02(s)). |  |  |

(b) [Reserved]

(c) *Existing indirect dischargers.*

Subpart C

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Ammonia-N | 0.0350 | 0.0175 |
| Cyanide | 0.00175 | 0.000876 |
| Phenols (4AAP) | 0.000175 | 0.0000584 |
| Lead | 0.000263 | 0.0000876 |
| Zinc | 0.000394 | 0.000131 |

[47 FR 23284, May 27, 1982, as amended at 49 FR 21030, May 17, 1984; 67 FR 64266, Oct. 17, 2002]