40 CFR § 420.95 - Pretreatment standards for existing sources (PSES).

---
identifier: "/us/cfr/t40/s420.95"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.95 - Pretreatment standards for existing sources (PSES)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.95"
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"
---


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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000526 | 0.000175 |
| Zinc | 0.000701 | 0.000234 |

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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000169 | 0.0000563 |
| Zinc | 0.000225 | 0.0000751 |

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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000338 | 0.000113 |
| Zinc | 0.000451 | 0.000150 |

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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000939 | 0.000313 |
| Zinc | 0.00125 | 0.000417 |

(5) *Fume scrubber.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| Lead | 0.0368 | 0.0123 |
| Zinc | 0.0491 | 0.0164 |
| Note: The above limitations are applicable to each fume scrubber associated with sulfuric acid pickling operations. |  |  |

(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 |  |
| Lead | 0.000920 | 0.000307 |
| Zinc | 0.00123 | 0.000409 |

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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000526 | 0.000175 |
| Zinc | 0.000701 | 0.000234 |

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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.00192 | 0.000638 |
| Zinc | 0.00255 | 0.000851 |

(4) *Fume scrubber.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| Lead | 0.0368 | 0.0123 |
| Zinc | 0.0491 | 0.0164 |
| Note: The above limitations shall be applicable for each fume scrubber associated with hydrochloric acid pickling operations. |  |  |

(5) *Acid regeneration (absorber vent scrubber).*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| Lead | 0.245 | 0.0819 |
| Zinc | 0.327 | 0.109 |
| Note: The above limitations shall be applicable to the absorber vent scrubber wastewater associated with hydrochloric acid regeneration plants. |  |  |

(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 |  |
| Chromium | 0.00213 | 0.000852 |
| Nickel | 0.00192 | 0.000638 |

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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.000960 | 0.000384 |
| Nickel | 0.000864 | 0.000288 |

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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00626 | 0.00250 |
| Nickel | 0.00563 | 0.00188 |

(4) *Strip, sheet, and plate—batch.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00192 | 0.000768 |
| Nickel | 0.00173 | 0.000576 |

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

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00322 | 0.00129 |
| Nickel | 0.00289 | 0.000964 |

(6) *Fume scrubber.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| Chromium | 0.0819 | 0.0327 |
| Nickel | 0.0735 | 0.0245 |
| Note: The above limitations shall be applicable to each fume scrubber associated with a combination acid pickling operation. |  |  |

[47 FR 23284, May 27, 1982; 47 FR 41739, Sept. 22, 1982, as amended at 49 FR 21033, May 17, 1984]