40 CFR § 420.122 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

---
identifier: "/us/cfr/t40/s420.122"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.122 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.122"
section_name: "Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT)."
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: "2026-04-05"
last_updated: "2026-04-05"
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"
---


# 420.122 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

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

Subpart L

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.175 | 0.0751 |
| O&G | 0.0751 | 0.0250 |
| Lead | 0.00113 | 0.000376 |
| Zinc | 0.00150 | 0.000500 |
| Chromium (hexavalent) | 0.000150 | 0.0000501 |
| pH | () | () |
| The limitations for hexavalent chromium shall apply only to galvanizing operations which discharge wastewaters from the chromate rinse step. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(2) [Reserved]

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

Subpart L

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.701 | 0.300 |
| O&G | 0.300 | 0.100 |
| Lead | 0.00451 | 0.00150 |
| Zinc | 0.00601 | 0.00200 |
| Chromium (hexavalent) | 0.000600 | 0.000200 |
| pH | () | () |
| The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

(2) [Reserved]

(c) *Fume scrubbers.*

Subpart L

|  |  |  |
| --- | --- | --- |
|  | Kg per day |  |
| TSS | 38.1 | 16.3 |
| O&G | 16.3 | 5.45 |
| Lead | 0.245 | 0.0819 |
| Zinc | 0.327 | 0.109 |
| Chromium (hexavalent) | 0.0327 | 0.0109 |
| pH | () | () |
| The limitations for hexavalent chromium shall be applicable only to galvanizing operations which discharge wastewaters from the chromate rinse step. |  |  |
| Within the range of 6.0 to 9.0. |  |  |

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; 47 FR 41739, Sept. 22, 1982, as amended at 49 FR 21036, May 17, 1984]