40 CFR § 420.77 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT).

---
identifier: "/us/cfr/t40/s420.77"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.77 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.77"
section_name: "Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT)."
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"
---


# 420.77 Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT).

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 conventional technology.

(a) *Primary mills, carbon and specialty*—(1) *Without scarfing.*

Subpart G

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.150 | 0.0561 |
| O&G | 0.0374 |  |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(2) *With scarfing.*

Subpart G

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.221 | 0.0830 |
| O&G | 0.0553 |  |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(b) *Section mills*—(1) *Carbon.*

Subpart G

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.357 | 0.134 |
| O&G | 0.0894 |  |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(2) *Specialty.*

Subpart G

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.224 | 0.0841 |
| O&G | 0.0561 |  |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(c) *Flat mills*—(1) *Hot strip and sheet mills, carbon and specialty.*

Subpart G

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.427 | 0.160 |
| O&G | 0.107 |  |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(2) *Carbon plate mills.*

Subpart G

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.227 | 0.0851 |
| O&G | 0.0568 |  |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(3) *Specialty plate mills.*

Subpart G

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.100 | 0.0376 |
| O&G | 0.0250 |  |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

(d) *Pipe and tube mills, carbon and specialty.*

Subpart G

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| TSS | 0.212 | 0.0795 |
| O&G | 0.0530 |  |
| pH | () | () |
| Within the range of 6.0 to 9.0. |  |  |

[47 FR 23284, May 27, 1982, as amended at 47 FR 41739, Sept. 22, 1982]